75results about How to "Improve photocatalytic reactivity" patented technology

The invention relates to a Nickel single-active site graphite-phase carbon Nitride-based photocatalytic material as well as a preparation method and application thereof, in the photocatalytic material, Ni is dispersed in a g-C3N4 framework in a single-atom-level degree to form active sites, and the molar content of the Ni is 1-5%. the nickel single-active site graphite-phase carbon nitride-based photocatalytic material has a large specific surface area, is good in dispersion in an aqueous solution, and can effectively inhibit the recombination of photo-generated carriers, the reaction activitysites of the surface of the g-C3N4 are increased, the photocatalytic hydrogen production efficiency can be remarkably improved, and the photocatalytic reaction activity of the g-C3N4 can be improved.

The invention discloses a silver oxide / barium titanate nano cube block hetero-structure ultrasonic photo-catalyst which consists of BaTiO3 nano cube blocks with the side length sizes of 60nm-90nm and Ag2O nanoparticles with the diameters being 1-10nm, wherein the Ag2O nanoparticles are loaded on the surfaces of the nano cube blocks; a mass ratio of BaTiO3 to Ag2O is (5:1)-(1:5). The ultrasonic photo-catalyst is prepared by the following steps: synthesizing the BaTiO3 nano cube blocks by adopting a hot alkali method, then loading Ag2O nanoparticles on the BaTiO3 nano cube blocks by using a simple chemical precipitation method. The catalyst integrates properties of excellent visible light catalysts Ag2O and BaTiO3; on one hand, current carriers are facilitated under the ultrasonic action, and additionally generated current carriers can accelerate the photo-catalytic reaction activity of the silver oxide; meanwhile, a synthetic process and device are simple, the cost is low, the efficiency is high, the reaction period is shortened, the repeatability is excellent and the industrialized application prospect is wide.

The invention relates to a mesoporous TiO2 Crystal Preparation method with a photosensitive activity as template, it belongs to chemical engineering technology. Use of titanium alkoxides or ion-containing titanium ions titanate or salts or mixtures of these substances as TiO2 precursor, ethanol or acetone or a mixture of both as the diluents, used ethylene glycol or isopropyl alcohol or a mixture of both as dispersant, used Perylenequinone derivatives or other natural extract with photosensitive activity as the photosensitive activity object; the titanium dioxide precursor hydrolysis and crystal to get the mesoporous TiO2 precursor; mesoporous TiO2 precursor was sintering to get mesoporous TiO2 Crystal with photosensitive activity as template. The mesoporous materials of this invention through sol-gel method and the high-temperature burning, do visible catalyst, or get carbon nm tube by the separation and purification. The invention has low cost of production, product higher catalytic activity, stable performance, simple process.

The invention belongs to the field of photocatalytic materials, in particular to a preparation method and application of a Z-type photocatalyst MgAl LDH / CN-H. The preparation method comprises the following steps: firstly, preparing g-C3N4, and preparing CN-H by acidizing and modifying g-C3N4; secondly, preparing MgAl LDH from raw materials of magnesium nitrate, aluminum nitrate, citric acid and urea by the hydrothermal reaction in an alcohol and water mixed system; and finally, assembling and forming the Z-type photocatalyst MgAl LDH / CN-H by the electrostatic attraction action of positively charged MgAl LDH and negatively charged CN-H. The prepared photocatalyst exhibits excellent photocatalytic performance under simulated solar irradiation, the degradation rate for tetracycline hydrochloride can reach to be more than 99%, and the degradation rate is 23 times higher than that of a single photocatalyst of g-C3N4 and 7.5 times higher than that of a single photocatalyst of MgAl LDH, so that the photocatalyst has relatively good application prospects.

The invention provides a transition metal phosphide / g-C3N4 composite material as well as a preparation method and application thereof. According to the transition metal phosphide / g-C3N4 composite material, transition metal phosphide is loaded on g-C3N4, the compounding of photoelectrons and holes can be remarkably reduced and hydrogen evolution over-potential is reduced, so that the photo-catalytic reaction activity of the g-C3N4 is improved; the transition metal phosphide / g-C3N4 composite material can be applied to a photo-catalytic reaction system and especially can be used in a photo-catalytic water decomposition and hydrogen production system. According to the preparation method provided by the invention, the interface bonding performance of the transition metal phosphide and the g-C3N4 can be improved so that the catalytic activity is improved; furthermore, the preparation method is simple to operate, wide in applicability, good in repeatability and wide applicable range; a reliable scheme is provided for reduction of the photo-catalytic cost and photo-catalytic hydrogen production.

The invention discloses a photocatalytic material with nano TiO2 loaded on graphene-foamed nickel and a preparation method of the photocatalytic material. The foamed nickel is taken as a base, a graphene film layer is deposited on the foamed nickel to form a graphene-foamed nickel composite carrier, a TiO2 sol film layer is formed on the graphene-foamed nickel composite carrier, the graphene is combined with the foamed nickel to serve as an organic carrier loaded with the nano TiO2, a three-layer structure is formed, the carrier is firmly loaded with the nano TiO2, and the photocatalytic activity of the TiO2 is greatly improved. An electrophoretic deposition method is used and a polyurethane foam serves as a base to prepare the foamed nickel with high specific surface area, the foamed nickel is then loaded with the graphene through the electrophoretic deposition method, the grapheme film layer is formed, a sol-gel method is used, no binder is used, the nano TiO2 with higher photocatalytic activity is loaded on the graphene-foamed nickel composite carrier, the whole process is simple in operation, the period is short, and the manufacturing cost is low.

The invention discloses a titanium dioxide-metal organic framework array with a uniformly and continuously coated nuclear-sheath structure, and a preparation method and application of the titanium dioxide-metal organic framework array. The titanium dioxide-metal organic framework array is provided with the uniformly and continuously coated core-sheath structure, wherein titanium dioxide is used asa core, and a metal organic framework is used as a sheath layer; the titanium dioxide is titanium dioxide nanowires, and the metal organic framework is a Ti-based bdc-(NH2)x, wherein the x is 0, 1 or2. The number of amino groups in the titanium dioxide-metal organic framework array can be regulated and controlled, and the thickness and uniformity of the metal organic framework which is used as the sheath layer can also be regulated and controlled. Performance of the array structure can be changed through the regulation and control of the thickness and uniformity of the metal organic framework which is used as the sheath layer, and through the regulation and control of the number of amino groups contained in ligands in the metal organic framework which is used as the sheath layer, the change of performance of the metal organic framework can be influenced by regulating the visible light absorption capacity of the metal organic framework.

The invention discloses a preparation method of a cuprous oxide and tritanium dicarbide heterojunction composite material and application thereof for photocatalytic reduction of carbon dioxide. The preparation method comprises the following steps: etching Ti3AlC2 with HF (Hydrofluoric Acid) to prepare tritanium dicarbide; preparing tritanium dicarbide nanosheets in a DMSO (Dimethylsulfoxide) stirring and ultrasonic mode; and carrying out in-situ growth on Cu2O on the tritanium dicarbide nanosheets under a hydrothermal condition, thereby obtaining the cuprous oxide and tritanium dicarbide heterojunction composite material. By adopting the preparation method, a Cu2O / MXene heterojunction composite material is prepared for a first time, the composite material is used as a photocatalyst for simulating CO2 reduction under radiation of an xenon lamp, and due to dense contact of hexagram-shaped Cu2O with two-dimensional MXene nanosheets, not only is the conductivity of the catalyst improved, but also the separation efficiency of electron holes is improved, and the optical absorption and the photocatalytic activity of Cu2O are improved.

The invention provides a preparation method of a carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst, the method comprises the following steps: taking melamine and urea asprecursors, preparing micro heterojunction g-C3N4 by a thermal condensation method, and stripping massive g-C3N4 by using oxygen as an etching gas to obtain flaky g-C3N4; mixing nano cellulose and theflaky g-C3N4, and performing heat treatment in a tube furnace under the protection of argon to obtain the carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst; putting thecarbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst in a mixed solution of water and ethanol to prepare hydrogen peroxide under visible light irradiation, wherein the content of the hydrogen peroxide is tested by a POD / DPD method. The product prepared by the method has the advantages of good conductivity, large specific surface area, high photocatalytic reaction activity, high charge carrier transmission efficiency and the like, is an environment-friendly photocatalytic material, and can be used for preparing the hydrogen peroxide through photocatalysis under visible light.

The invention relates to a photocatalyst for degrading organic pollutants and a preparation method thereof. The photocatalyst is vanadium-yttrium composite oxide, a general formula of chemical composition is VxY1O(2.5x+1.5), and x is vanadium-yttrium mol ratio, and is more than or equal to 0.3 and is less than or equal to 3.5. The preparation method for the photocatalyst comprises the following steps that: a yttrium nitrate solution and an ammonium metavanadate solution are mixed to generate a precipitate under the condition of stirring according to the vanadium-yttrium mol ratio; and the precipitate is aged through the stirring and then is evaporated to remove moisture, an obtained solid is dried and finally is baked at a temperature of between 400 and 600 DEG C, and a finished photocatalyst product is obtained after the cooling. The invention also relates to a catalyst for precious metal Pt supported by V1.5Y1O5.25 composite oxide and a preparation method thereof. The photocatalyst has the advantages of simple preparation method and low cost, good visible light degradation property to the organic pollutants, and higher commercial application prospect.

The invention discloses and relates to a titanium dioxide collosol used for preparing wide-spectrum photocatalytic materials and a preparation method thereof. The titanium dioxide collosol comprises organic or inorganic titanium compounds and solvents, as well as soluble nitrates or organic salts of modified metallic ions used for blending, and the modified metallic ions used for blending are palladium, iron, tungsten, silver, vanadium, iron, cadmium or zirconium; wherein, weight of the organic or inorganic titanium compounds occupies 1 to 30 percent of total weight after being translated to weight of the titanium dioxide; and after weight of the soluble nitrate or the organic salt of the modified metallic ions used for blending is translated to weight of the metallic oxide, the proportion between the soluble nitrate or the organic salt of the modified metallic ions and the titanium dioxide is between 0.01 to 1 and 0.2 to 1 by weight. The invention adopts proper chemical substances and processing methods for modifying the titanium dioxide catalyst, and leads the processed catalyst to have higher liveness in photocatalyst reactions can implement the photocatalytic reactions by using ultraviolet lights with larger wavelength or even natural daylights.

The invention relates to a foamed nickel-loaded zinc titanate photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: taking foamed nickel as amatrix, uniformly coating zinc titanate template agent mixed suspension on a thin layer to form a zinc titanate / template agent composite carrier; soaking and dissolving out by the template agent, anddrying to form the foamed nickel-loaded zinc titanate (ZnTiO3) photocatalytic material. The preparation method specifically comprises the following steps: forming turbid liquid A from polytetrafluoroethylene (PTFE) and ethanol, and adding ZnTiO3 and the template agent into the turbid liquid A according to a certain ratio so as to form turbid liquid B; uniformly coating the turbid liquid B onto thefoamed nickel, drying and soaking into the template dissolved-out solution for dissolving out the template agent, and flushing with deionized water and drying; and finally obtaining the foamed nickel-loaded ZnTiO3 photocatalytic material. According to the method disclosed by the invention, preparation of the foamed nickel-loaded ZnTiO3 photocatalytic material is realized, the binding force between materials is firm, and the prepared product has high catalytic activity on organic matter degradation in an ultraviolet light range, and has obvious advantages of being long in service life, easy torecover, free in secondary pollution and the like; and the whole process is simple in operation, short in cycle, energy-saving and low in manufacturing cost. The invention relates to a photocatalyticmaterial for water treatment.

A method for preparing cadmium tantalate nanoparticle photocatalysts is provided. The method includes the following steps: dissolving tantalum pentachloride and cadmium nitrate tetrahydrate in anhydrous alcohol and then dissolving polyethylene glycol in anhydrous alcohol; mixing the solutions under magnetic stirring, and evaporating solvents in a water bath to obtain a transparent sol; placing the transparent sol in an oven, fan-drying to obtain a dry sol, and grinding to obtain a flavescent precursor powder; calcining the precursor powder in a muffle furnace to obtain a gray powder; calcining the gray powder in the muffle furnace; and naturally cooling down to room temperature to obtain white cadmium tantalate nanoparticle photocatalyst. The invention utilizes the cadmium element instead of alkali metal and alkaline earth metal elements. The energy band structure and state density calculation show that the valence band of the photocatalyst is mainly formed by 02p orbital, the conduction band thereof is formed by Ta 5d, 02p and Cd 5s5p hybrid orbits, the band gap is minimized, Ta and Cd orbits are used together as reaction points to enhance the photocatalytic activity.

The invention relates to nano-photocatalyst disinfectant, which is prepared from the following components by mass percent: 1-10% of nano titanium dioxide photocatalyst powder, 1-20% of ethanol and 70-98% of water. A technology for preparing the nano-photocatalyst disinfectant comprises the following steps: (1) adding the nano titanium dioxide photocatalyst powder into water according to the proportion, and fully stirring and mixing to obtain uniform nano titanium dioxide photocatalyst suspension; (2) adding the ethanol into the nano titanium dioxide photocatalyst suspension, and fully and evenly stirring to obtain the nano-photocatalyst disinfectant. The effective components in the nano-photocatalyst disinfectant can fully adhere to the skin surfaces of patients and can disinfect and sterilize in a lasting way, and has the characteristics of being non-toxic, free from drug resistance, long-acting, broad-spectrum, and the like; furthermore, the nano-photocatalyst disinfectant is clear in color, convenient to observe and easy to use. The nano-photocatalyst disinfectant has an obvious curative effect for skin diseases such as beriberi, bromhidrosis and skin tinea which are caused by fungi and bacteria, and has an obvious healing promoting effect when being used for disinfecting wound.

The invention discloses a filtering net composite material for an air purifier. The filtering net composite material is characterized by containing the following raw materials in parts by weight: 5-10 parts of nano-copper, 5-10 parts of nano-zinc oxide, 10-15 parts of nanometer titania aqueous dispersion with the concentration of 40%, 60-80 parts of acetone, 2-5 parts of an epoxy resin, 1-5 parts of poly-1,4-diphenylbutadiyne and 30-40 parts of activated carbon fibers. The filtering net composite material for the air purifier, disclosed by the invention, contains metal nano-copper, nano-zinc oxide and nanometer titania and has the effects of filtering, inhibiting and killing bacteria and removing formaldehyde. The composite material is excellent in PM2.5 filtering effect, high in formaldehyde removal rate, wide in types of inhibited and killed bacteria, long in service life, safe and environment-friendly. Meanwhile, the preparation method provided by the invention is low in material cost, readily available in raw materials and simple and clear in process and has high practical value and excellent application prospects.

The invention relates to a preparation method of a water-phase cerium fluoride microparticle and application thereof, and belongs to the technical field of photocatalysis. The preparation method has the advantages that by using ceric ammonium nitrate or cerous nitrate as a cerium source, and using ammonium hexafluorotitanate or ammonium fluoride as a fluorine source, the water-phase cerium fluoride microparticle with good dispersivity is prepared by a simpler and mild preparation technology; the good phtocatalysis property is realized under the visible light condition, and the application field of cerium fluoride is widened.

The invention discloses a high efficient visible-light response catalyst, which is characterized in that the catalyst is of a composite oxide, the chemical composition general formula is xVSmO, wherein x is n(V) / n(Sm), and x is more than 0.5 and less than 4.5. A preparation method for the catalyst comprises the following steps of: mixing samarium nitrate solution and ammonium metavanadate solution by stirring to obtain precipitate, then rotationally evaporating for removing water, and roasting the mixture in a muffle furnace at 300-700 DEG C after the mixture are dried in a baking oven. The invention has simple preparation technique; the prepared VSmO photocatalyst has excellent capability of catalyzing and oxidizing organic pollutants by visible light; after being loaded with precious metals, the photocatalytic activity and the deep oxidation capability of the catalyst can be obviously improved.

The invention discloses a CdS nano-snowflake photocatalyst. The catalyst is of a hexagonal snowflake structure formed by six blade structures and has the diameter of 2-8 mu m; each blade structure is1-4 mu m long and 0.5-2 mu m wide; the main exposed crystal face of the structure is 002 side. The photocatalyst is prepared from cadmium acetate dihydrate and ammonium thiocyanate as main raw materials with a simple hydrothermal method. According to the photocatalyst, narrow-gap semiconductor CdS is combined with high-activity exposed face (002), so that photon absorption rate and migration ratecan be increased; under the action of illumination, carrier generation is facilitated, and photocatalytic reaction activity is improved by additionally produced carriers. Experiments prove that the catalyst has good catalytic performance for degradation of organic pollution models under sunlight (especially ultraviolet light and visible light), and has broad market application prospect.

The invention discloses a silver oxide nano particle / molybdenum sulfide nanosheet heterostructure ultrasonic near infrared catalyst and a preparation method thereof. The silver oxide nano particle / molybdenum sulfide nanosheet heterostructure ultrasonic near infrared catalyst and the preparation method thereof have the advantages that the prepared catalyst uses piezoelectric material molybdenum sulfide as the matrix, the surface of the matrix is loaded with silver oxide nano particles with high catalytic activity and a near infrared photocatalysis effect, the catalyst has the properties of the excellent infrared photocatalyst silver oxide nanoparticles and molybdenum sulfide nanosheets and the piezoelectric effect of the molybdenum sulfide nanosheets under ultrasonic action, carrier separation is benefited, and the generated carrier promotes the photocatalytic activity of the silver oxide; the silver oxide nano particle / molybdenum sulfide nanosheet heterostructure is prepared by the reaction of the hydrothermal precipitation method, and the preparation method is simple in synthesizing process and equipment, simple to operate, low in production cost, high in efficiency, short in reaction period, good in repeatability and promising in industrial application prospect.

The invention discloses a foam ceramic supporter, a TiO2 photocatalyst supported on the foam ceramic supporter and a preparation method thereof. The foam ceramic supporter includes foam ceramic and acomposite oxide, wherein the foam ceramic has a porous foam structure, the pore edges in the foam ceramic contain three-dimensional penetrating micro-scale pore channels, the composite oxides distributing in the surface of the pore edges and the interior of the pore channels. The preparation method of the foam ceramic supporter includes: impregnating the foam ceramic with a composite oxide precursor slurry to obtain the foam ceramic supporter. The TiO2 photocatalyst supported by the foam ceramic supporter is high in photo-catalytic activity, wherein the TiO2 is not liable to lose, so that thephotocatalyst has good activity stability and is especially suitable for photocatalytic purification of gas or liquid.

The invention relates to an antibacterial carved stone ceramic tile and a preparation method thereof, and belongs to the technical field of ceramic tile processing and manufacturing. The antibacterialcarved stone ceramic tile is prepared from kaolin, ball clay, potassium feldspar, porcelain clay, pyrophyllite, coating glaze, a composite photocatalytic antibacterial agent and bentonite through steps of: ball-milling pulping, forming, one-time sintering, ink jetting, glazing with addition of a composite photocatalytic antibacterial agent, secondary sintering, and polishing and trimming. A TiO2 / Ag2O composite microsphere photocatalytic antibacterial agent which is prepared through high-temperature calcination by utilizing a sol-gel method is added, wherein the photogenerated holes and electrons generated by TiO2 and Ag2O can be mutually migrated, so that the recombination rate of the photogenerated holes and the electrons is reduced, the photocatalytic activity is improved, and the photocatalyst has the advantages of large specific surface area, high photocatalytic reaction activity, high antibacterial efficiency and the like, and can stably play an antibacterial role for a long time. A good air purification effect is achieved, and substances such as TVOC in air can be effectively removed. The method is simple in process, convenient to operate and suitable for large-scale production.

The invention relates to a foamed nickel-loaded zinc titanate / tourmaline photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: taking foamed nickel as a matrix, uniformly coating zinc titanate / tourmaline light / template agent mixed suspension on a thin layer to form a zinc titanate / tourmaline / template agent composite carrier; soaking and dissolving out by the template agent, and drying to form the foamed nickel-loaded zinc titanate / tourmaline photocatalytic material. The preparation method specifically comprises the following steps: forming turbid liquid A from polytetrafluoroethylene (PTFE) and ethanol, and adding zinc titanate, tourmaline and the template agent into the turbid liquid A according to a certain ratio so as to form turbid liquid B; uniformly coating the turbid liquid B onto the foamed nickel, drying and soaking into the template dissolved-out solution for dissolving out the template agent, and flushing with deionized water and drying; and finally obtaining the foamed nickel-loaded zinc titanate / tourmaline photocatalytic material. According to the method disclosed by the invention, preparation of the foamed nickel-loaded zinc titanate / tourmaline photocatalytic material is realized, the binding force between materials is firm, and the prepared product has high catalytic activity on organic matter degradationin an ultraviolet light range, and has obvious advantages of being long in service life, easy to recover, free in secondary pollution and the like; and the whole process is simple in operation, shortin cycle, energy-saving and low in manufacturing cost. The invention relates to a photocatalytic material for water treatment.

The invention discloses a multifunctional filter screen material for an air conditioner internal unit. The multifunctional filter screen material comprises, by weight, 4-6 parts of heat conduction additives, 10-15 parts of nano-titanium dioxide aqueous dispersion with the concentration of 40%, 50-60 parts of epoxy resins, 1-5 parts of poly 1, 4-diphenyl diacetylene, 8-14 parts of processing agents, 6-9 parts of natural bactericidal extracts and 30-40 parts of activated carbon fibers. The multifunctional filter screen material has filtering function and further has the functions of restraining and sterilizing bacteria and removing formaldehyde, PM2.5 (particulate matter2.5) filtering effect of the material is good, formaldehyde removing rate is high, bacterium restraining and sterilizing kinds are wide, service life is long, heat-conducting property is good, and the material is safe and environmentally friendly. The invention further provides a preparation method of the material. The method is low in material cost and simple in process, raw materials are easily acquired, and the filter screen material serving as the air conditioner internal unit has high practical values and good application prospect.

The invention discloses a visible photocatalysis functional topcoat with quantum dots and a preparation method of the visible photocatalysis functional topcoat. The visible photocatalysis functional topcoat comprises the following components in percentage by weight: 1-10% of a silicate coating resin, 1-10% of noble metal ion doped titanium dioxide quantum dots, 0.02-2% of silicon nanoparticles, 0-1% of FeOOH nanoparticles, 0.1-1% of a leveling agent, 0.1-1% of a dispersant, 0.1-1% of a thickening agent, 0.1-1% of a defoaming agent and the balance of water. Compared with a conventional photocatalysis coating, the visible photocatalysis functional topcoat with the quantum dots is capable of remarkably improving a photocatalysis effect, continuously and efficiently removing harmful substancessuch as formaldehyde, benzene, ammonia, TVOCs (total volatile organic compounds) and PM2.5 and purifying indoor air environments and outdoor haze elimination, and killing bacteria, viruses, fungi, microorganisms in a broad spectrum, can be used temporarily once being used, and in addition is safe to use.

The invention relates to the field of sewage treatment, and in particular relates to a method for enhancing photodegradation of organic dyes in wastewater by acetaldehyde. The method includes the following steps: adding a certain amount of hydrogen peroxide into the wastewater containing the organic dyes, and performing stirring for a certain period of time to obtain micro-oxidized wastewater; andadding a certain amount of an acetaldehyde solution into the micro-oxidized wastewater to obtain a pre-treatment solution, introducing the pre-treatment solution into a container, wherein the interior of the container is provided with multiple layers of photocatalytic plates, and irradiating the container with ultraviolet light for a certain period of time to obtain degraded wastewater, wherein the surfaces of the photocatalytic plates contain a certain amount of metal silver and rare earth elements. The method overcomes the defects of lower photocatalytic efficiency and poor recycling performance of a method for photodegrading organic dyes in wastewater used in the prior art, and has the advantage of rapidly degrading the organic dyes in the water under conditions of low ultraviolet light intensity; and meanwhile, the addition content of a photocatalytic accelerator is low, and the photocatalytic efficiency is not reduced with time.

The invention provides a BiOCl / graphite-like phase carbon nitride composite photocatalyst with a (010) crystal face exposed and a preparation method and application thereof. A light composite method is adopted, BiOCl is illuminated to generate electrons on the (010) crystal face, and holes are formed in the (100) and (001) crystal faces. The holes attract the layered structures g-C3N4 with negative charge through static electricity, the layered structures g-C3N4 are loaded on the (100) and (001) crystal faces with P4 / nmm (129) BiOCl as tetragonal phases and space point groups, and the BiOCl (010) crystal face is exposed to form the BiOCl / g-C3N4 composite photocatalyst with the (010) crystal face exposed. The formed BiOCl / g-C3N4 composite photocatalyst with the (010) crystal face exposed has relatively high photocatalytic activity.

The invention discloses a single-layer molybdenum disulfide / ultrafine titanium dioxide nanoribbon heterostructure photocatalyst, which is composed of ultrafine titanium dioxide nanoribbons with a length of 100nm to 300nm, a width of 5nm to 15nm, and a thickness of 1nm to 5nm. The surface is wrapped with a layer of two-dimensional nanomaterial MoS2 with a thickness of 0.8nm to 3nm, wherein the photocatalyst has a mass ratio of MoS2:TiO2=0.1 to 10:100. The photocatalyst of the present invention combines the properties of MoS2 and TiO2. On the one hand, under the action of light, MoS2 is beneficial to carrier molecules, and the generated carriers promote the photocatalytic reaction activity of ultra-fine TiO2 nanoribbons, which reduces organic pollution. It has good catalytic performance in the degradation of model substances and photocatalytic hydrogen production; on the other hand, the heterojunction can effectively suppress the generated carrier recombination. The photocatalyst synthesis process and equipment of the invention are simple, low cost, high efficiency, short reaction cycle, good repeatability and broad industrial application prospects.

The invention relates to a three-dimensional porous carbon nitride photocatalytic material, and a preparation method and an application thereof. The preparation method of the photocatalytic material comprises the following steps: dissolving melamine in absolute ethyl alcohol, uniformly stirring, removing part of the solvent, and calcining the obtained mixture in a muffle furnace to obtain a layered carbon nitride material; and adding hexamethylenetetramine into the carbon nitride material, uniformly mixing, putting the obtained mixture into the muffle furnace, and annealing and calcining the mixture to obtain the three-dimensional porous carbon nitride photocatalytic material. The material can efficiently reduce hexavalent chromium in wastewater, the preparation process is simple, and rawmaterials required in the preparation process are wide in source and low in price. The photocatalytic material can solve the problems of lamellar carbon nitride accumulation, high photon-generated carrier recombination rate and the like, and can be widely used for treating heavy metal wastewater.