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71results about How to "Improve photodegradation efficiency" patented technology
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Preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth
InactiveCN105080528AIncrease chance of contactImprove photodegradation efficiencyBiocideWater/sewage treatment by irradiationSol-gelMercury vapors
The invention relates to a preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth, and belongs to the technical field of photocatalysis. The preparation method comprises the steps of: pickling original diatomite, roasting the pickled diatomite, and uniformly mixing the roasted diatomite, a binder, a fluxing agent and the like so as to obtain molded diatomite; and using tetrabutyl orthotitanate and dehydrated alcohol as raw materials, preparing TiO2 and rare earth doped TiO2 sol by a sol-gel method, macerating the preformed diatomite in the sol, drying the macerated diatomite, and calcining the dried diatomite so as to obtain the load type photocatalyst. The photocatalyst can prevent the TiO2 from running off; besides, the rare earth is doped, so that the utilization rate of visible light by the TiO2 is increased; when a mercury-vapor lamp is used for 3 hours, 95% of a rhodamine b solution can be degraded; when the photocatalyst is illuminated for an hour under sunlight, escherichia coli can be thoroughly killed; when the photocatalyst is illuminated for 24 hours by common daylight lamps, 92% of methanal can be degraded; the photocatalyst is excellent in photocatalytic property and stability, which indicates that the photocatalyst has favorable application prospects in the respects of waste water treatment, sanitation and sterilization, air purification and the like.
Owner:NORTHEASTERN UNIV
Preparation method of metastable phase bismuth oxide and application thereof in photocatalytic degradation of organic pollutants
ActiveCN107029770AEasy to separateQuick migrationPhysical/chemical process catalystsWater/sewage treatment by irradiationPhotocatalytic degradationLight response
The invention discloses a preparation method of metastable phase bismuth oxide and application thereof in photocatalytic degradation of organic pollutants. The preparation method comprises the following steps: carrying out hydrothermal reaction on an aqueous solution which contains ammonium bismuth citrate, urea and hexadecyl trimethyl ammonium bromide to obtain bismuthyl carbonate microflowers; and calcining the bismuthyl carbonate microflowers in an air environment to obtain the metastable phase bismuth oxide beta-Bi2O3 / Bi2O2.33@Bi2O2CO3. The preparation method is simple and controllable to operate, and is environmentally friendly. The synthesized metastable phase bismuth oxide has the advantages of visible-light response, large specific surface area, high catalytic activity and the like, has the characteristics of rapidness and high efficiency in a process of visible-light catalytic degradation of the organic pollutants, and can be widely applied to the technical field of treatment of the organic pollutants.
Owner:CENT SOUTH UNIV
Preparation and application of CdSe/BiOCl-based composite photocatalyst
InactiveCN107754822AAchieve separationUniform sizePhysical/chemical process catalystsWater/sewage treatment by irradiationEnvironmental chemistryQuantum dot
The invention discloses a preparation method of a CdSe / BiOCl composite photocatalyst, belonging to the technical field of environmental material preparation. The method comprises the following concrete steps: dissolving cadmium chloride and methacrylic acid by using deionized water, stirring, then adjusting a pH value, injecting supernate formed after selenium powder and sodium borohydride are dissolved in deionized water, introducing nitrogen gas, heating, then cooling naturally, centrifugalizing, washing, and drying to obtain CdSe quantum dots; dissolving bismuth nitrate pentahydrate into amannitol solution, dropwise adding a saturated sodium chloride solution, stirring, then pouring the mixture into a reaction kettle, performing hydrothermal reaction, then cooling naturally, centrifugalizing, washing, drying and stoving to obtain BiOCl nanosheets; weighing the prepared CdSe quantum dots and BiOCl nanosheets, mixing and stirring the CdSe quantum dots and the BiOCl nanosheets in a water solution, then centrifugalizing, washing, drying and stoving to obtain the CdSe / BiOCl composite photocatalyst. The photocatalyst has a relatively good shape and stability, and visible light can beeffectively utilized to degrade tetracycline in antibiotic wastewater.
Owner:JIANGSU UNIV
Method for preparing niobate photocatalyst
InactiveCN101433834AHigh crystallinityNarrow particle size distributionMetal/metal-oxides/metal-hydroxide catalystsPotassium hydroxidePhotodegradation
The invention discloses a method for preparing a niobate photocatalyst, and relates to a method for preparing a photocatalyst. The method solves the problems that a photocatalyst prepared by the prior method has poor adsorptivity and low photodegradation efficiency. The preparation method comprises the following steps: 1. niobium pentaoxide and potassium hydroxide are weighed, and a mixture is prepared through magnetic stirring; 2. the mixture is placed into a high-pressure reaction kettle to be prepared into a precursor of the niobate photocatalyst; and 3. the precursor of the niobate photocatalyst is filtered, washed and dried. The invention is to adopt a method of synthesis by a hydro-thermal method to realize the synthesis of the niobate photocatalyst first. The obtained product has high purity, good absorption performance, and high photodegradation efficiency; and the method has cheap raw materials, simple process and simple equipment.
Owner:HARBIN INST OF TECH
Preparation method and application of MIL-100(Fe) nanometer catalyst
InactiveCN107715916AReduce synthesis conditionsLarge specific surface areaWater/sewage treatment by irradiationWater treatment compoundsNano catalystHigh pressure
The invention relates to a preparation method and application of an MIL-100(Fe) nanometer catalyst. The preparation method comprises the following steps: (a) dissolving trimesic acid and an inorganicalkali into water to form a first solution; (b) dissolving an iron source in water to form a second solution containing Fe<2+> or / and Fe<3+>; and (c) dropwise adding the first solution into the secondsolution, performing a reaction under stirring, performing filtering, performing rinsing with ethanol, performing drying, and collecting the filter cake, wherein the molar ratio of the trimesic acidto the inorganic alkali to the iron element is 1:(2-3.5):(1-1.5). The MIL-100(Fe) with high crystallinity can be synthesized at room temperature. The reaction solvent is water and avoids use of a large amount of organic solvents, highly corrosive additives such as HF are not needed, the reaction conditions are mild, high-pressure reaction kettles are not required, and the preparation method is easy to operate, easy for industrial large-scale synthesis, and greatly reduces the MIL-100(Fe) synthesis conditions.
Owner:GUIZHOU NORMAL UNIVERSITY
Rare earth element-doped bismuth oxide photocatalyst and preparation method thereof
InactiveCN102658116AImprove adsorption capacityEnhanced light absorptionMetal/metal-oxides/metal-hydroxide catalystsRare-earth elementWater baths
The invention discloses a rare earth element-doped bismuth oxide photocatalyst and a preparation method thereof and belongs to the technical field of photocatalysts for treating organic pollutants. The rare earth element-doped bismuth oxide photocatalyst has active components of bismuth oxide and one or more rare earth elements, wherein the one or more rare earth elements comprise europium or / and cerium. The preparation method comprises the following steps of adding ethylenediaminetetraacetic acid and ammonia water into distilled water, stirring with heating until full dissolution, adding bismuth oxide, ionic liquids and europium oxide or / cerous nitrate into the mixed solution, heating in a water bath kettle to obtain xerogel and carrying out sintering and grinding to obtain rare earth element-doped bismuth oxide photocatalyst particles. Through doping of different metal ions and ionic liquids having different concentrations, a high adsorption capacity and a high light absorption capacity of the rare earth element-doped bismuth oxide photocatalyst are improved and the rare earth element-doped bismuth oxide photocatalyst is a novel photocatalyst having good light absorptivity and a strong degrading capability in the visible region. The preparation method is simple, allows mild conditions and does not produce secondary pollution in preparation.
Owner:JILIN UNIV
Preparation method of titanium dioxide/graphene composite material
InactiveCN103480354AHigh catalytic activityAvoid reunionMaterial nanotechnologyPhysical/chemical process catalystsHydrazine compoundReducing agent
The invention discloses a preparation method of a titanium dioxide / graphene composite material. The preparation method comprises the following steps: heating a mixture of graphite and peroxide, adding water, applying ultrasonic, mixing with a reducer water solution and a titanium salt precursor water solution, and carrying out hydrothermal reaction, wherein the reducer is hydrazine hydrate, p-phenylene diacrylate, glucose or ascorbic acid. The preparation method disclosed by the invention can adopt one-step reaction, and is simple to operate; and the prepared composite material has high photocatalytic efficiency.
Owner:上海梦泺企业管理咨询有限公司
Preparation and application of titanium dioxide/activated carbon self-assembled composite
InactiveCN106423130AHigh crystallinityNarrow particle size distributionPhysical/chemical process catalystsWater/sewage treatment by irradiationActivated carbonNanoparticle
The invention relates to preparation of a titanium dioxide / activated carbon self-assembled composite. With a self-assembling method, activated carbon and titanium dioxide with efficient photocatalytic activity are effectively combined, and the efficient catalytic activity of titanium dioxide and the adsorption performance of activated carbon are utilized; the high adsorption performance of an activated carbon material is kept, and the photocatalytic activity of the activated carbon material is remarkably improved while compared with that of titanium dioxide, and the prepared material can be applied to treatment of xanthate in nonferrous metal beneficiation wastewater and can be repeatedly used. A product has high purity, good adsorption performance and high photodegradation efficiency and contains anatase type nanoparticles. The cost of raw materials is low, the process is simple and equipment is simple; the removal effect of xanthate in the beneficiation wastewater is better, and the composite is a simple, efficient and environment-friendly material and has good application prospect.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
Nano flower-shaped ZnO photocatalyst, preparation method and application thereof
InactiveCN110124654AAvoid gatheringImprove photodegradation efficiencyWater/sewage treatment by irradiationWater treatment compoundsNanoparticleReusability
The invention discloses a nano flower-shaped ZnO photocatalyst, a preparation method and application thereof. The nano-flower-shaped ZnO photocatalyst is of a three-dimensional nano-flower structure formed by stacking nano-sheets in a staggered mode, wherein the appearance is uniform, the crystallization performance is good and sufficient high-activity crystal faces are exposed on the surface, sothat in a reaction process with the photocatalyst, aggregation of single nano-particles can be prevented, and the photodegradation efficiency of pollutants is further improved. The method is simple tooperate in the preparation process and low in cost, and has good reusability and stability. The ZnO photocatalyst can degrade organic pollutants under different illumination conditions, and has gooddegradation capability.
Owner:TIANJIN UNIV
Process for preparing light degradable nano composite plastics
The present invention relates to the preparation process of light degradable nanometer composite plastic. The preparation process includes the modification of nanometer TiO2 powder with surface modifier to obtain nanometer modified TiO2 powder; dissolving polystyrene, foamed polystyrene or polyvinyl chloride in chloroform or tetrahydrofuran as solvent; adding nanometer modified TiO2 powder; and volatilizing solvent to prepare the light degradable nanometer composite plastic, which has the weight ratio between polystyrene, foamed polystyrene or polyvinyl chloride and TiO2 powder in 100 to 0.5-5. The present invention has low cost and simple technological process, and the prepared light degradable nanometer composite plastic may be degraded in the sun to reduce white pollution.
Owner:WUHAN UNIV
Automatic sewage treatment system based on constructed wetland and control method of system
ActiveCN106242070AEffective control of inflowIncrease inflowBiological treatment regulationSustainable biological treatmentConstructed wetlandWater treatment system
The invention discloses an automatic sewage treatment system based on a constructed wetland. The system comprises wetland plants, a drawer type sealed wetland box where various filtering matrixes are laid therein, a water inlet pipe, a water seepage pipe, a water storage cavity, a water outlet pipe, a controller, a detector and an electronic display screen. The water inlet pipe and the water seepage pipe are sequentially communicated with the water storage cavity, the wetland box and the water outlet pipe. The water storage cavity is communicated with the wetland box. Flow guide holes are formed in a flow guide plate. The electronic display screen is installed on the ground, and the controller and the detector are arranged in the electronic display screen and connected with the wetland box through signals. According to the automatic sewage treatment system based on the constructed wetland and a control method of the system, control and detection units and the like are adopted, and intelligence of the sewage treatment system is enhanced. Meanwhile, the nitrogen and phosphorus removal efficiency of the constructed wetland sewage treatment technology is improved, the problem that a traditional constructed wetland treatment technology cannot eliminate heavy metal pollution easily is solved, and workloads for later maintenance of the sewage treatment system are reduced.
Owner:QINGDAO UNIV
Zinc oxide/carbon quantum dot composite photocatalyst, preparation method and application thereof
ActiveCN110124655AAvoid gatheringImprove photodegradation efficiencyWater/sewage treatment by irradiationWater treatment compoundsSynthesis methodsOxide composite
The invention discloses a zinc oxide / carbon quantum dot composite photocatalyst, a preparation method and application thereof. Aiming at the problems existing in the zinc oxide composite photocatalystat present, the synthesis method of the zinc oxide composite photocatalyst is improved; the zinc oxide / carbon quantum dot composite photocatalyst is prepared by combining carbon quantum dots with three-dimensional zinc oxide nanoflowers synthesized by a hydrothermal method. The structure of the composite photocatalyst is a nanoflower formed by stacking nanosheets, the synthetic morphology is uniform, and the composite photocatalyst has good crystallization performance. The composite photocatalyst can be used for treating various organic pollutants under simulated sunlight, and the problems oflow photocatalytic efficiency, poor reusability, high production cost and the like of the traditional photocatalyst in the prior art are solved. Meanwhile, the preparation method is simple to operateand low in cost, and has good reusability and stability.
Owner:TIANJIN UNIV
Preparation method of oxidized grapheme/titanium dioxide photocatalytic composite material precursor
InactiveCN106475083AImprove overall utilizationIncrease profitPhysical/chemical process catalystsPhotodegradationTitanate
The invention discloses a preparation method of an oxidized grapheme / titanium dioxide photocatalytic composite material precursor. The preparation method includes the steps of S1) , preparation of an oxidized grapheme / tetrabutyl titanate composite material; S2), preparation of an oxidized grapheme / titanium dioxide composite material. With the preparation method, the photocatalytic composite material precursor with uniform load of titanium dioxide can be prepared; TiO2 in the precursor and the oxidized grapheme are organically composited, TiO2 particles are evenly loaded on slice layers of the oxidized grapheme, introduction of the oxidized grapheme has double functions of loading the TiO2 particles and improving photocatalytic activity of titanium dioxide, and photodegradation efficiency is effectively improved; the material for the precursor has good coating function; the preparation method has the advantages of simple steps, easiness in operation, moderate preparation conditions and easy control, high efficiency and the like.
Owner:东北大学秦皇岛分校
Preparation method of visible light response type TiO2 (titanium dioxide) precursor and prepared TiO2 precursor and catalyst thereof
ActiveCN107096556ASolving Recycling ProblemsSolve visible light unresponsivenessWater/sewage treatment by irradiationWater treatment compoundsSolventMolecular sieve
The invention relates to a preparation method of a visible light response type TiO2 (titanium dioxide) precursor and a prepared TiO2 precursor and a catalyst thereof. The preparation method comprises the following steps of (1) adding titanate and organic macromolecules into a reaction container, adding boric acid at the temperature of 50 to 90 DEG C, and reacting at the temperature of 100 to 120 DEG C until a solution is clear and transparent; (2) at the temperature from room temperature to 90 DEG C, adding a nitrogen-containing compound, heating and refluxing; (3) at the temperature from room temperature to 100 DEG C, adding a chelating agent, heating and refluxing; and (4) at the temperature from room temperature to 80 DEG C, dripping a mixed solution of water and alcohol, refluxing after dripping, cooling, relieving pressure, and removing a solvent, so as to obtain the TiO2 precursor. The preparation method has the advantages that the TiO2 precursor can be dissolved into a common solvent, so that the TiO2 precursor can be loaded on substrates of fibers, molecular sieves and the like by simple impregnating; the substrate for loading the precursor is sintered at high temperature in air, and the precursor is converted into a TiO2 photocatalyst to be loaded onto the substrate, so that the problem of recycling of the catalyst is solved, and the problem of no response of common TiO2 catalyst to the visible light is also solved.
Owner:INST OF CHEM CHINESE ACAD OF SCI +1
Light degradable TiO2- polystyrene composite plastic preparation method
InactiveCN1569948APhotodegradation effectiveLow costInorganic pigment treatmentIn situ polymerizationPolystyrene
The invention relates to a light degradable TiO2- polystyrene composite plastic preparation method which consists of, carrying out nano TiO2 surface modifying, charging 0.5-5 wt% of modified nanometer TiO2 into styrene monomer, employing home position polymerization method to produce the light degradable TiO2- polystyrene composite plastic.
Owner:WUHAN UNIV
Sewage treatment system convenient to maintain based on constructed wetlands
ActiveCN106430600AInflow impactIncrease inflowSustainable biological treatmentBiological water/sewage treatmentConstructed wetlandNitrogen
The invention discloses a sewage treatment system convenient to maintain based on constructed wetlands. The sewage treatment system comprises wetland plants and is characterized by further comprising a drawer type sealed wetland box in which multiple filtering substrates are laid; the wetland plants are planted on the wetland box, a plurality of drawer layers with containing cavities are arranged in the wetland box, and the filtering substrates for purifying sewage are placed in the drawer layers respectively; large bluestone blocks, small gravels, fine sand, modified zeolite, nano composites and a soil layer are placed on the drawer layers respectively from bottom to top. According to the sewage treatment system convenient to maintain based on the constructed wetlands, the nitrogen and phosphorus removal efficiency of the constructed wetland sewage treatment process is enhanced, the problem that heavy metal pollution is hard to remove through a traditional constructed wetland treatment process is solved, and meanwhile the workload of later maintenance of the sewage treatment system is reduced.
Owner:QINGDAO UNIV
Ternary composite photocatalytic material synthesized by one-step hydrothermal method
InactiveCN107626333AImprove photodegradation efficiencyThe synthesis steps are simpleWater/sewage treatment by irradiationWater contaminantsNon noble metalChemistry
The invention provides a non-noble metal modified heterostructure ternary composite photocatalytic material synthesized by a simple one-step hydrothermal method and a manufacturing method thereof. Thesynthesis steps can be simplified, the production cost can be lowered, and at the same time the dye degradation performance of a catalytic material can be improved, and the catalytic material is named as BiOCl / Bi2MoO6 / Bi. Compared with the prior art, the method provided by the invention realizes a new way for preparation of the metal modified heterostructure ternary photocatalytic material by one-step hydrothermal method, simplifies the synthesis steps, and lowers the production cost.
Owner:QINGDAO AGRI UNIV
Preparation method and application of bismuth oxychloride with function of adjusting position of energy band
ActiveCN110201685AStrong oxidation abilityPromote degradationPhysical/chemical process catalystsWater treatment compoundsSolventMethyl orange
The invention discloses a preparation method and application of bismuth oxychloride with a function of adjusting the position of an energy band, and belongs to the technical field of environmental protection and pollutant degradation. According to the preparation method, a mixed solvent composed of any more of ethyl alcohol, ethanediamine, diethylene glycol and triethylene glycol is utilized to replace existing ethyl alcohol as a reaction solvent, and a BiOCl material with a down-shifted valence band is prepared through a solvothermal reaction. The oxidizability of photo-generated h<+> of theBiOCl material with the down-shifted valence band is stronger, which is more conductive to degrading pollutants; in addition, the h<+> with the strong oxidizability can activate H2O2 to generate O2<->, and the photodegradation efficiency is further improved. A photodegradation effect shows that the degradation rate of BiOCl for rhodamine B, methyl orange and phenol is increased by 3.2-4.6 times after the H2O2 is added.
Owner:JIANGNAN UNIV
Graphite-like carbon nitride/graphene/graphene oxide composite aerogel and preparation method thereof
PendingCN113617351ASolve the problem of low photocatalytic efficiencyUniform grain structureWater/sewage treatment by irradiationWater treatment compoundsVitamin COrganic dye
The invention discloses a preparation method of graphite-like carbon nitride / graphene / graphene oxide composite aerogel. The preparation method specifically comprises the following steps: step 1, grinding urea or melamine or a mixture formed by mixing urea and melamine in any ratio into powder, and heating to prepare graphite-like carbon nitride; step 2, mixing the graphite-like phase carbon nitride obtained in the step 1 with distilled water; step 3, uniformly mixing the graphite-like phase carbon nitride nanosheet aqueous dispersion liquid with a graphene oxide aqueous solution and a vitamin C aqueous solution; step 4, performing high-speed centrifugation on the precursor sol; and step 5, drying the wet gel by using a freeze dryer to obtain the graphite-like carbon nitride / graphene / graphene oxide composite aerogel. The invention also provides the graphite-like carbon nitride / graphene / graphene oxide composite aerogel prepared by the method. Compared with graphite-like carbon nitride, the graphite-like carbon nitride / graphene / graphene oxide composite aerogel has the advantage that the degradation efficiency and degradation rate of organic dye degraded by a photocatalytic material are improved.
Owner:XIAN UNIV OF TECH
Visible light-responsive N, B co-doped In2O3/TiO2 precursor, and preparation method and application thereof
ActiveCN110681405ASolving Recycling ProblemsSimple stepsWater/sewage treatment by irradiationWater treatment compoundsFiberMolecular sieve
The invention discloses a visible light-responsive N, B co-doped In2O3 / TiO2 precursor, and a preparation method and application thereof. In the In2O3 / TiO2 precursor, the N element accounts for 1-3% ofthe mass of the precursor, the B element accounts for 0.01-0.6% of the mass of the precursor, and a molar ratio of In to Ti is 0.001-0.03. The N, B co-doped In2O3 / TiO2 precursor can be dissolved in acommon solvent, so that the precursor can be loaded on substrates such as fibers, molecular sieves, silicon wafers, and glass wafers by simple impregnation, the substrate after loading is subjected to high-temperature roasting in air, and the precursor is converted into a N, B co-doped In2O3 / TiO2 photo-catalyst, and loaded on the substrate, so that the problem of catalyst recycling is solved, andthe problem that an ordinary TiO2 catalyst has no response to visible light is solved.
Owner:INST OF CHEM CHINESE ACAD OF SCI
Preparation method of glass fiber group yttrium doped titanium dioxide photo-degradation catalyst filament
InactiveCN101391209AImprove photodegradation efficiencyEliminate pollutionWater/sewage treatment by irradiationMetal/metal-oxides/metal-hydroxide catalystsChemistryYttrium
Disclosed is a preparation method of glass fiber-based yttrium doped titanium dioxide photodegradation catalytic filaments, which is characterized in that the method comprises the following steps: (1) preparing an yttrium doped titanyl tartrate solution; (2) washing fiber glass filaments clean with water; (3) heating the clean fiber glass filaments to a temperature of between 50 and 80DEG C, soaking the filaments to the yttrium doped titanyl tartrate solution with the temperature of between 50 and 80DEG C, and adopting a soakage Czochralski method to form an yttrium doped titanyl tartrate precursor film on the surface of the fiber glass filaments; and (4) implementing the heat treatment to the fiber glass filaments coated with the yttrium doped titanyl tartrate precursor, when in heat treatment, the room temperature is taken as an initial temperature which is elevated to between 480 and 520DEG C at a heating rate of 10 to 20DEG C / min, and the heat is preserved for 30 to 60 minutes, and finally the finished product is acquired after natural cooling.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Preparation method for visible light ternary photocatalyst
InactiveCN108311132APoor resolutionImprove stabilityPhysical/chemical process catalystsDistillationPhotochemistry
The invention belongs to the technical field of photocatalysis, and particularly relates to a preparation method for a visible light ternary photocatalyst. The preparation method comprises the following steps: step 1, adding tetrabutyl titanate into absolute ethyl alcohol, and ultrasonically stirring for 30-60 minutes to obtain a titanate alcohol solution; step 2, slowly dropwise adding ethyl silicate into the titanate alcohol solution, mechanically stirring until completely dissolving to obtain a titanium-silicon mixed alcohol solution; step 3, adding a dispersing agent into ionized water toform dispersion liquid, and slowly adding the dispersion liquid into titanium-silicon alcohol solution to obtain titanium-silicon dispersion liquid; step 4, putting graphene into the titanium-silicondispersion liquid, and performing cyclic ultrasonic reaction for 4-6 hours, thereby obtaining the ternary mixed solution; step 5, putting the ternary mixed solution into a decompression distillation reaction kettle to perform decompression distillation reaction for 60-90 minutes, thereby obtaining a viscous solution; and step 6, putting the thick solution into a drying oven to dry for 30-50 minutes, and heating and sintering for 20-40 minutes, thereby obtaining the ternary photocatalyst. The preparation method solves the problem that performance, in a visible light region, of a graphene-titanium dioxide catalyst is not good; and the prepared photocatalyst is high in stability and photodegradation efficiency.
Owner:SHAOXING UNIVERSITY
Process for preparing light degradable nano composite plastics
Owner:WUHAN UNIV
Method for preparing rubidium sulfate-doped improved titanium-based TiO2 film photocatalyst
InactiveCN106000427APromote formationEasy to separatePhysical/chemical process catalystsPhotocatalytic degradationChemistry
The invention discloses a novel method for preparing a rubidium sulfate (Rb2SO4) modified titanium-based TiO2 film photocatalyst and application thereof to the aspect of photocatalytic degradation of organic pollutants. The preparation method comprises a step 1) of titanium sheet polishing, a step 2) of hydrothermal preparation, a step 3) of natural cooling and airing and a step 4) of calcination for finally obtaining the rubidium sulfate modified titanium-based TiO2 film photocatalyst. Moreover, through calcination of titanium-based TiO2 titanium sheets at different preparation time, the photodegradation capability of organic dyes under different morphologies is explored. Through in-situ growth of the TiO2 sheets and the doping of different elements for modification of the surface structure of the TiO2 sheets, the photocatalyst which is efficient and low in cost is prepared; and the photocatalyst is applied to the process of degrading printing and dyeing wastewater. TiO2 is modified in a metal and non-metal co-doping mode, and the mass transfer of pollutants to the photocatalyst can be quickened, so as to improve photocatalytic degradation efficiency of the photocatalyst.
Owner:JILIN UNIV
Rare earth element-doped bismuth oxide photocatalyst and preparation method thereof
InactiveCN102658116BImprove adsorption capacityEnhanced light absorptionMetal/metal-oxides/metal-hydroxide catalystsWater bathsEthylenediamine
Owner:JILIN UNIV
Wastewater treatment system based on constructed wetlands
ActiveCN106348537AImprove adsorption capacityImprove photocatalytic abilityWater treatment compoundsWater contaminantsConstructed wetlandWater treatment system
The invention discloses a wastewater treatment system based on constructed wetlands. The wastewater treatment system based on constructed wetlands comprises wetland plants, a sealed wetland tank and a water inlet pipe, wherein multiple filtration matrixes are laid in the sealed wetland tank; wastewater flows through each layer of filtration matrixes in the wetland tank so as to be purified; the water inlet pipe is used for injecting the wastewater into the wetland tank; a water seepage mechanism which is communicated with the water inlet pipe and is used for conveying the wastewater into each layer of filtration matrixes in the wetland tank in sequence is arranged at the bottom of the wetland tank; and a water outlet pipe, through which water obtained after treating wastewater which flows through the filtration matrixes at the bottom layer in sequence, permeates through and is filtered to the filtration matrixes on the top layer flows out of the wetland tank, is arranged on the top of the wetland tank. The wastewater treatment system based on constructed wetlands has the beneficial effects that the nitrogen and phosphorous removal efficiency of a constructed wetland wastewater treatment technology is intensified, the problem that the traditional constructed wetland wastewater treatment technology is less likely to eliminate heavy metal pollution is solved, and meanwhile, the workload of later period maintenance of the wastewater treatment system is reduced.
Owner:QINGDAO UNIV
Method for preparing carbon-doped bismuth oxychloride nanoflower powder
InactiveCN109550511AIncrease the areaHigh activityPhysical/chemical process catalystsGlycerolDissolution
The invention discloses a method for preparing a carbon-doped bismuth oxychloride nanoflower powder. The method specifically comprises the steps of adding bismuth nitrate pentahydrate and nickel chloride to glycerol for dissolution separately , and then uniformly mixing the two solutions; placing the mixed solution in an oven for hydrothermal reaction to obtain a solid-liquid mixture; and washingthe solid-liquid mixture and conducting drying to obtain the carbon-doped bismuth oxychloride nanoflower powder. According to the invention, the carbon-doped bismuth oxychloride nanoflower powder is prepared by conducting a one-step hydrothermal process on a common chemical raw material bismuth nitrate pentahydrate and nickel chloride. The obtained bismuth oxychloride powder have a flower-like structure formed by gathering of a nano-scale layer structure, so that the specific surface area and the reactive active site of the material are increased, the photodegradation efficiency of the material is significantly improved, meanwhile carbon element introduced by the doped solvent glycerol changes the energy band structure and the forbidden band width of the material, and extends the spectralresponse range of the material to a visible light region, and thus the application limitation of a single bismuth oxychloride material is broken.
Owner:XIAN UNIV OF TECH
Efficiently-degradable oil sand tailing flocculating agent and preparation method thereof
InactiveCN109179614AAdjust space sizeAdjust the distributionWater/sewage treatment by irradiationWater treatment compoundsFlocculationPhotodegradation
The invention discloses an efficiently-degradable oil sand tailing flocculating agent. The efficiently-degradable oil sand tailing flocculating agent is obtained by adopting a nanometer titanium dioxide inorganic composite particle as a nucleus and polyacrylamide as a film, wherein the nanometer titanium dioxide inorganic composite particle is obtained through coating kaolin with titanium dioxide,and the polyacrylamide is bonded on the surface of the nanometer titanium dioxide inorganic composite particle. The efficiently-degradable oil sand tailing flocculating agent can effectively improvethe photodegradation efficiency of the polyacrylamide, and also can solve the problem of uneven dispersion of the nanometer titanium dioxide. The invention also provides a preparation method of the efficiently-degradable oil sand tailing flocculating agent. The preparation method has the advantages of simple steps, easiness in operation, mild and easily-controlled preparation conditions and high efficiency. The flocculating agent can be used in the field of polymer flocculation degradation to substitute traditional polyacrylamide, and solves the problem of pollution of outward discharge of oilsand exploitation tailings to the environment. The preparation method has the characteristics of no influences on the action effect of the flocculating agent, environmental protection and low cost.
Owner:东北大学秦皇岛分校
Rare earth Tb doped bismuth vanadate photocatalyst and preparation method thereof
ActiveCN112058257AImprove photodegradation efficiencyThe preparation method is simple and gentleEnergy based wastewater treatmentMetal/metal-oxides/metal-hydroxide catalystsFluid phaseBismuth vanadate
The invention discloses a rare earth Tb doped bismuth vanadate photocatalyst and a preparation method thereof. The preparation method comprises the following steps: dissolving bismuth nitrate pentahydrate in a nitric acid solution to obtain a solution A; dissolving ammonium metavanadate into a sodium hydroxide solution to obtain a solution B; slowly dropwise adding the solution A into the solutionB, and uniformly performing stirring to obtain a bismuth vanadate suspension; dropwise adding the terbium chloride solution into the bismuth vanadate suspension to obtain terbium-doped bismuth vanadate suspension, continuously performing stirring, adjusting the pH value to 6 by using a sodium hydroxide solution, carrying out water bath at 80-90 DEG C for at least 1h, performing cooling, carryingout suction filtration to obtain a precipitate, drying, performing calcining at 480-520 DEG C for at least 4h, performing cooling, and grinding theprecipitate into powder to obtain the rare earth Tb-doped bismuth vanadate photocatalyst. The photodegradation efficiency of the rare earth Tb doped bismuth vanadate photocatalyst reaches up to 99%, a liquid phase precipitation method is adopted, and the preparation method is simple and mild.
Owner:PANZHIHUA UNIV
Device and method to degrade polycyclic aromatic hydrocarbon pollutants
PendingCN108408830AHas strong oxidizing propertiesImprove photodegradation efficiencyWater/sewage treatment by irradiationWater treatment compoundsPolycyclic aromatic hydrocarbonWastewater
The invention relates to a device and method to degrade polycyclic aromatic hydrocarbon pollutants. The device with modified nano titanium oxide that carries waste shell powder is used to provide efficient and green degradation for polycyclic aromatic hydrocarbon pollutants in wastewater. The device and method have the advantages that waste oyster shells are turned into wealth, efficient photocatalytic degradation is provided for polycyclic aromatic hydrocarbons in wastewater, the environment is protected, and health is maintained for aquatics and human.
Owner:FISHERIES RES INST OF FUJIAN
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