344results about How to "Improve catalytic oxidation performance" patented technology

The invention provides equipment and a method for treating nondegradable wastewater by utilizing catalytic oxidation of ozone. The equipment comprises a feeding system, an ozone catalytic reaction tower and a spray absorbing tower; the feeding system comprises a wastewater pH regulation device, a wastewater feeding pipeline, a hydrogen peroxide aqueous solution feeding pipeline, an ozone feeding pipeline and a pH regulator feeding pipeline; the wastewater pH regulation device is communicated with the wastewater feeding pipeline and the pH regulator feeding pipeline respectively; the ozone feeding pipeline is communicated with the wastewater feeding pipeline; the ozone catalytic reaction tower is communicated with the wastewater feeding pipeline and the hydrogen peroxide aqueous solution feeding pipeline respectively so that wastewater undergoes once catalytic reaction in the presence of a first catalyst to generate a liquid flow and an ozone tail gas flow which are subjected to initial treatment; and the spray absorbing tower is communicated with a catalytic reaction system, is used for spraying at least one part of the liquid flow which is subjected to the initial treatment, and is contacted with the ozone tail gas flow in the presence of a second catalyst to undergo second catalytic reaction.

The invention provides a high-property absorption and wave absorption type catalyst for VOCs (Volatile Organic Chemicals) catalytic oxidation. The high-property absorption and wave absorption type catalyst has a structural formula: a Cu-Mn-Ce / TiO2-molecular sieve or a CNDs-Cu-Mn-Ce / TiO2-molecular sieve, wherein CNDs serve as a modifier; Cu and Mn serve as catalytic activity components; Ce serves as a promoted catalytic metal; a TiO2-molecular sieve serves as a carrier. The invention further provides a preparation method of the catalyst. According to the catalyst and the preparation method of the catalyst provided by the invention, the treatment cost is greatly reduced and energy is utilized at maximum through the advantages of the combination of a plurality of materials, so that the relatively good VOCs catalytic oxidation effect can be realized under the microwave irradiation.

The invention provides a tin-silicon molecular sieve. The tin-silicon molecular sieve contains silicon, tin and oxygen elements. All or a part of crystal grains have internal cavities or cavity structures, a total specific surface area is greater than or equal to 300m<2> / g, and a ratio of an external specific surface area to the total specific surface area is greater than or equal to 10%. The tin-silicon molecular sieve has good catalytic oxidation effects.

The invention relates to a preparation method of a titanium-silicon molecular sieve with controllable grain size. The method is as follows: the titanium-silicon molecular sieve with the controllable grain size is synthesized in a hydrothermal system by modulating a nano-scale molecular sieve mother solution as a seed crystal, and the range of the grain size is 50-500nm. The titanium-silicon molecular sieve synthesized by the method provided by the invention has the advantages of small grain size, high degree of crystallization, high content of framework titanium, strong hydrophobicity and very high activity against selective oxidation reaction of olefin epoxidation, hydroxylation of aromatic hydrocarbons, ammonia oxidation of ketones and the like. The method is suitable for a classic or cheap system, and the nano-scale titanium-silicon molecular sieve can be synthesized in the cheap system.

The invention discloses a fluorine-containing titanium-silicon molecular sieve with a MWW (Manual Wire Wrap) structure and a preparation method and an application thereof. In the molecular sieve, a fluorine atom is connected with a framework silicon atom in the form of a chemical bond, an XRD (X-Ray Diffraction) spectrogram contains a characteristic spectral line of the molecular sieve with the MWW structure, and characteristic peaks of -150+ / -5ppm and -143+ / -5ppm appear in a 19FMAS-NMR (19 File Management Assistant For Server-Nuclear Magnetic Resonance) spectrogram; the preparation method comprises the following steps of: synthesizing a boron-containing parent body, post-treating, baking and the like; and the molecular sieve serving as a catalyst is applied to catalytic oxidation reactions of compounds containing carbon-carbon double bonds and at least one other functional group as well as reactions for catalytically synthesizing oxime. The molecular sieve has a complete crystalline state structure; according to the electronic effect of framework fluorine, the molecular sieve and higher catalytic oxidation capability; a preparation process is simple, and is easy for industrial production; synthesis of corresponding epoxides or catalytic synthesis of oxime from compounds containing carbon-carbon double bonds and at least one other functional group can be catalyzed at higher activity and high selectivity; and a reaction process is environmentally-friendly.

An oxidation sweetening method for fuel oil selecting modified titanium-silicon molecular screen as accelerating agent belongs to technical sphere of petroleum process. The invention provides an accelerating agent of modified titanium-silicon molecular screen which can be used in oxidation sweetening of fuel oil. The charge number of earth silicon in this invention adopting immersion method is 1.0wt%-3.0wt%. The obtained modified titanium-silicon molecular screen is used for catalytic and oxidation desulfurization of fuel oil. The significance effect of this invention is that it improves the repetitive use of accelerating agent in oxidation sweetening reaction. The method includes selecting modified titanium-silicon molecular screen as accelerating agent and removing sulfidization of fuel oil by hydrocarbonylation, which can reduce the sulfur content of fuel oil to 29.7 mu / g from 226.1 mu / g and reach deep desulfuration, and the accelerating agent can be recovered and the catalytic oxidation susceptibility of the recovered accelerating agent is good. The invention is of mild reaction condition, simple equipment and no consumption of hydrogen gas.

The invention relates to a method for synthesizing TS-2 molecular sieves, in particular to a method for synthesizing the TS-2 molecular sieves under the condition of adding H2O2, which belongs to the technical field of chemical engineering. The method for synthesizing the TS-2 molecular sieves has the advantages of simple operation and high framework titanium content and can effectively avoid the formation of anatase TiO2. The method comprises the following steps of: placing tetraethoxysilane (TEOS) into a dripping tube, dripping the TEOS into a flask, and properly accelerating the stirring speed; adding tetrabutyl orthotitanate (TBOT) into anhydrous isopropyl alcohol (IPA); slowly dripping the mixed liquid into a three-neck flask under the condition of severe stirring; adding 10 percent (wt) of TBAOH template agents into the three-neck flask after the dripping is completed, and adding H2O2 according to a certain n(H2O2) / n(Ti) ratio to obtain light yellow solution; and carrying out heating and alcohol removal through water baths to obtain clear glue solution.

The invention belongs to the technical field of removal of formaldehyde and discloses a nano-fiber membrane material capable of decomposing formaldehyde at normal temperature, and a preparation methodand an application of same. With carbonized MOFs being a formaldehyde catalyst, the material, compared with a conventional transition metal oxide, is large in specific surface area and high in porosity and has advantage of uniform dispersion of metal active components; compared with a conventional powdery formaldehyde catalyst, by using the nano-fiber membrane as a catalyst supporter, the productis uniform in catalyst particle distribution and is low in wind drag, so that the product is high in catalytic performance on the formaldehyde and also is long in service life. The room-temperature formaldehyde catalyst in the invention has excellent catalytic oxidization activity; compared with a formaldehyde catalyst in the prior art, at 25 DEG C, the product in the invention can reach more than 95% in catalytic conversion rate of the formaldehyde; after operation for 800 hours, the catalytic activity is not reduced, so that the product can satisfy present industrial demands better.

The invention discloses a catalyst for catalyzing and oxidizing oxynitride in flue gas, which is prepared by using mesoporous silica as a vector, one or mixture of two of kalium and molybdenum as a doping component and platinum as an active component by adopting an equal-volume stepwise impregnation method. The invention also discloses a process for preparing the catalyst, and simultaneously discloses application of the catalyst in flue gas denitration process. Under the action of the catalyst, by utilizing oxygen contained in the flue gas per se, nitrogen oxide is oxidized into nitrogen dioxide which is easily dissolved in water, so that the oxidizability of nitric oxide in the flue gas can be improved, and the flue gas is absorbed and denitrated by utilizing alkali liquor. The kalium and polybdenum doped platinum-based catalyst prepared by the process has catalytic oxidation performance obviously superior to an undoped platinum-based catalyst, and has high denitration efficiency; and under the catalytic oxidation action of the kalium and polybdenum doped platinum-based catalyst, the NOx oxidizability in the oxidized flue gas is just between 45 and 65 percent, and the denitration side product nitrite can be reclaimed so as to realize recycling of the denitration product.

The invention discloses a modified meerschaum, a preparation method and an application thereof. The preparation method comprises the following steps: immersing meerschaum by water with solid liquid ratio being 1:5-1:15, drying and crushing; then placing the purified meerschaum in an acid solution with concentration being 1-5mol / L and continuously stirring for 1-5 hours under water-bath condition at constant temperature of 30-60 DEG C; calcinating meerschaum through acid modification for 2-6 hours under temperature condition being 200-500 DEG C, cooling and crushing to granularity being 80-120 meshes; dipping the meerschaum after heat treatment in a soluble compound solution containing metal ions, stirring for a while under condition of 20-40 DEG C; finally dropping alkali in a mixing solution for adjusting acid-base value, and then processing to obtain the modified supported meerschaum. The modified meerschaum has good effect for catalysis ozone to deeply process the pulping papermaking waste water.

The invention relates to a catalyst used for inducing catalysis and oxidation and a preparation method. The invention uses one or a plurality of salt solution of transition metals with certain concentration to immerse the Al2O3 which is activated, activated clay or diatomite, puts the Al2O3 which is activated, activated clay or diatomite into a muffle furnace to be roasted after being dried to dissolve the transition metal salt and reduce the oxide on the surface of the vector into metal substance after being reduced and activated to prepare the catalyst. The mass ratio between the vector of the catalyst prepared by the invention and the loading transition metal is (70-99):(1-30). The catalyst is mainly used for the catalysis and oxidation under the existence of an external energy field and has the advantages of the large adsorption capacity, the better effect of catalysis and oxidation, the fast reaction, the stable treatment effect, the wide scope of application, the long service life and so on. The invention can quickly dissolve the micromolecular substances into small molecule substances, facilitate the quick degradation of featured pollutants and reduce the biological toxicity of organic wastewater, so as to improve the biodegradability of the wastewater.

The invention discloses a preparation method of a composite metal oxide catalyst for the catalytic decomposition of VOCs (Volatile Organic Compounds). Nano powder TiO2 is used as a carrier; after a composite metal oxide layer is formed, transition metal salt is added; the composite metal oxide catalyst with multiple active components is formed after heat treatment. The composite metal oxide catalyst has higher catalytic oxidation capacity (more than 98 percent) for ester and benzene organic matters at a low ignition temperature (300 DEG C). The catalyst is prepared by adopting a normal-temperature precipitation method; the method is simple and convenient. The composite metal oxide catalyst does not contain a noble metal element, and is low in cost. The composite metal oxide catalyst is prepared by adopting a two-step precipitation method to ensure that Ce is closely in contact with the TiO2; a solid solution is conveniently formed during roasting; the composite metal oxide catalyst has favorable oxygen supply capacity. Finally, loaded transition metal elements are uniformly distributed on the surface of the catalyst; the adsorption on molecules of the VOCs is facilitated; an active site is provided; the catalytic capacity is increased. The obtained catalyst is used for oxidizing the VOCs into CO2 and H2O, has advantages of high catalytic conversion rate, low ignition temperature, high stability, low price and the like, and has favorable application value and prospect.

The invention discloses an electroplating comprehensive wastewater treatment process, and relates to the technical field of electroplating wastewater treatment. The electroplating comprehensive wastewater treatment process comprises the following steps: step 1, pretreatment of electroplating comprehensive wastewater, comprising (1) precipitating and sand filtering; (2) wastewater composition detection; step 2, classified catalytic oxidation of the electroplating comprehensive wastewater, comprising (1) for the electroplating comprehensive wastewater with a chemical oxygen demand less than 950 mg / L, adopting one-stage heterogeneous Fenton-like reaction as catalytic oxidation; (2) for the electroplating comprehensive wastewater with a chemical oxygen demand more than or equal to 950 mg / L, adopting two-stage heterogeneous Fenton-like reaction as catalytic oxidation; step 3, ion exchange of the electroplating comprehensive wastewater: adopting chelate resin to adsorb corresponding heavy metal ions. The electroplating comprehensive wastewater treatment process disclosed by the invention improves the requirement of the Fenton technology on pH value, enhances the catalytic oxidation effect, prolongs the service life of activated carbon, prolongs the resin supersaturation time, ensures that the effluent meets the standard, reduces the cost, is convenient to operate, and facilitates implementation of large-scale automatic wastewater treatment.

The invention discloses a treatment method of high-concentration organic wastewater. The method has a favorable treatment effect on high-concentration organic wastewater of which the COD (Chemical Oxygen Demand) concentration is larger than 50000mg / L and the chromaticity is larger than 10000 times. The hardly degradable substances in the treated wastewater can be degraded, so that the biodegradability of the treated wastewater is improved and the treated wastewater reaches the biochemical treatment requirement. The treatment method smartly combines ultrasonic splitting, micro-electrolytic decomposition and high-grade oxidation, and the problem that the high-concentration organic wastewater which has high COD and large toxicity and is difficulty biochemically degraded is solved.

The invention provides a high yield rapid synthesis method of a titanium-silicon molecular sieve TS-1. The synthesis method comprises the following steps: mixing raw materials namely a silicon source, a titanium source, tetrapropyl ammonium hydroxide and water according to a ratio of SiO2:TiO2:TPAOH:H2O of 1:(0.0501-0.099):(0.0501-0.1499):(0.101-4.999), wherein the silicon source is at least one of n-methyl silicate, n-ethyl silicate, silica sol, and white carbon black; the titanium source is at least one of tetraethyl titanate, tetrabutyl titanate, isopropyl titanate, titanium trichloride, and titanium tetrachloride; carrying out hydrolysis for 0-5 hours at a temperature of 30 to 60 DEG C, performing alcohol removal for 0 to 1 hour at a temperature of 90 DEG C, filling the hydrolysis product into a crystallization kettle, carrying out crystallization for 2 to 10 hours at a temperature of 210 to 250 DEG C; drying, and burning to obtain the titanium-silicon molecular sieve TS-1. The titanium-silicon molecular sieve TS-1 synthesized by the provided method has the advantages of high content of titanium in skeleton, little using amount of template, no generation of wastewater, and high crystallization speed. The particle size of obtained nano level titanium-silicon molecular sieve is about 100 nm. The titanium-silicon molecular sieve has an excellent catalytic performance on alkene epoxidation and aromatic hydrocarbon hydroxylation.

The invention discloses a method for modifying a titanium silicate molecular sieve material. In the method, titanium silicate molecular sieves, a reducer, a precious metal source and a protective agent are added into water, the mixture is mixed and stirred at 0 to 100 DEG C, and the product is recovered. The method is improved on the basis of the conventional loading process and is simple and easily implementable in operation, and the product obtained by the method is high in activity and stability.

The invention discloses a preparation method and application of a functional carbon nanotube loaded Pd catalyst. The preparation method comprises the following steps: carrying out in-situ introductionof carbon quantum dots through low temperature pyrolysis of citric acid and carrying out surface modification on carbon nanotubes; meanwhile, introducing nitrogen elements for co-modification; in addition, preparing a carbon-based catalyst with a metallic state Pd content as high as 76 percent by adopting simple processes such as equal-volume impregnation and hydrogen reduction. The catalyst hasobvious catalytic oxidation activity on benzyl alcohol (and derivatives thereof) and fatty alcohols; besides, the performance can be optimized by regulating synthesis conditions, so that the catalyticoxidation conversion rate of the benzyl alcohol can reach 92 percent.

The invention relates to a reverse osmosis concentrated wastewater treatment method, belongs to the wastewater treatment, and especially relates to electrochemical water treatment. Electric energy is adopted as excitation energy, a three-dimensional catalytic oxidation electrolysis treatment device is adopted, the three-dimensional catalytic oxidation electrolysis treatment device comprises a cathode plate and an anode plate, electrode-catalyst particles are filled between the cathode plate and the anode plate, and an air blowing process is adopted to activate a cathode. The reverse osmosis concentrated wastewater treatment method has the advantages of decrease of the content of COD in treated wastewater to below 60mg / L, simple flow, less electricity consumption, low cost, and wide use, and is suitable for treating reverse osmosis concentrated water discharged in a standard exceeding manner and generated in the reclaimed water reuse process of various wastewaters, and other wastewaters which are difficult to degrade. Water discharged after the reverse osmosis concentrated wastewater treatment can reach the discharging standard that the COD content is not greater than 60mg / L, so the method is a new approach for the reverse osmosis concentrated water treatment; and the method has the characteristics of environmental protection and no secondary pollution.

A preparation method of a compound SCR catalyst with zero-valent mercury conversion function belongs to the technical field of environmental protection, comprising the following steps: adding a ruthenium precursor and a basic denitrating catalytic component precursor to deionized water in sequence and stirring the mixture uniformly to obtain dipping solution, then mixing a catalyst carrier with the dipping solution and drying the mixture and finally roasting the dried catalyst carrier in a muffle furnace to obtain the compound SCR catalyst. The catalyst prepared by the invention can effectively convert the zero-valent mercury in the flue gas into the divalent mercury which is easy to remove while reducing and converting the nitric oxides, thus forming the divalent mercury which is convenient to catch and realizing double effects of simultaneously denitrating the coal-fired flue gas and oxidizing the zero-valent mercury.

The invention discloses a preparation method for an aluminium-oxide-supported iron oxides catalyst, and application of the catalyst to organic wastewater processing. The preparation method comprises the following steps: (1) firstly cleaning an aluminium oxide particle with clean water, and then modifying the aluminium oxide particle by using a low-pressure plasma, so as to obtain modified aluminium oxide; (2) fully dipping the modified aluminium oxide obtained in the step (1) in an iron salt solution, and then drying, so as to obtain iron-loaded aluminium oxide; and (3) calcining the iron-loaded aluminium oxide obtained in the step (2), so as to obtain the aluminium-oxide-supported iron oxides catalyst after calcining is finished. The aluminium-oxide-supported iron oxides catalys obtained by employing the preparation method possesses the advantages of being fast in reaction speed, relatively thorough in organics degradation, high in ozone utilization rate and the like during organic waste water processing.

A metallo phthalocyanine derivative and its salt and their preparing process are disclosed. Said metallic phthalocyanine derivative is prepared through condensation reaction between maleic acid anhydride or butanedioic acid anhydride and tetraamino metalo phthalocyanine in polar solvent. Said metallophthalocyanine derivative salt is prepared through neutralizing reaction between metallophthalocyanine derivative and alkali.

The invention discloses a method of utilizing copper smelting slag to remove SO2, NOx and Hg in nonferrous smelting flue gas. The method includes: using copper slag slurry prepared from the copper smelting slag as an absorbent to perform liquid-phase catalytic oxidation of SO2, NOx and Hg in the nonferrous smelting flue gas at normal temperature and normal pressure to achieve the objective of removing SO2, NOx and Hg in the nonferrous smelting flue gas. Oxidation of SO2, NOx and Hg is realized through catalytic oxidation action of metal oxide and transition metal ions contained in the copper smelting slag. The method is simple, raw materials are extremely large in reserve volume, easy to get, low in cost, easy for industrialized application and good in removal effect, and the objective of using waste to treat waste so as to realizing clean production can be achieved.

The invention belongs to the technical field of environmental protection and catalysts, and in particular relates to a preparation method of a supported catalyst for catalytic combustion of VOCs. It is made of ZSM-5 molecular sieve with high specific surface area and metal precursor; it is dried on ZSM-5 molecular sieve with high specific surface area to remove the adsorbed moisture; then the metal precursor is mixed with water, stirred and dissolved to obtain a solution; The prepared solution is stirred and mixed with the pretreated ZSM‑5 molecular sieve, left standing, dried, calcined, and cooled to normal temperature to obtain a supported catalyst for catalytic combustion of VOCs. The catalyst of the present invention uses ZSM-5 molecular sieve with high specific surface area as the carrier, which can reduce the amount of active components and cost, and at the same time, facilitate the adsorption of pollutants on the surface of the catalyst. The catalytic oxidation ability of the catalyst to VOCs is improved, and the benzene series (such as toluene) in the VOCs can be efficiently removed by catalytic combustion at low temperature. Moreover, the catalyst has low cost, simple process, good hydrothermal stability and sulfur resistance performance.

The invention provides a rare metal-based sludge activated carbon and application thereof in the removal of sulfur, ammonia and phosphorus. The rare metal-based sludge activated carbon includes sludge activated carbon and metal elements such as manganese, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium and the like, and is specifically prepared by a method comprising the following steps: mixing pyrolusite powder with activated sludge, adding a zinc chloride compounded activating agent into the mixture, activating the mixture at a high temperature, carbonizing the mixture to obtain pyrolusite compounded activated sludge, mixing the activated sludge with rare earth oxide powder and a chelating agent after the activated sludge is modified by potassium hydroxide solution, heating the mixture in a microwave oven, carbonizing the mixture to obtain rare earth compounded activated sludge, and mixing the compounded activated sludge to obtain a product. The rare metal-based sludge activated carbon prepared by the method has the advantages of high activity, high porosity, uniform pore size distribution, high adsorption capacity, capability of chelating a plurality of metals and microorganisms, high capacity of adsorbing sulfur, ammonia and phosphorus and high rate of removing the sulfur, the ammonia and the phosphorus in sewage and waste.

The invention discloses a flue gas desulfurization, denitration and demercuration integrated device with a circulating fluidized bed and a method. A circulating fluidized bed reaction tower in the device is sequentially provided with a smoke chamber, a venturi tube, a first-order reaction zone, a shrinking opening, a second-order reaction zone and a reaction tower outlet from bottom to top, and atomizing spray guns are respectively arranged in the first-order reaction zone and the second-order reaction zone; 4-6 bypass pipelines are uniformly arranged outside the circulating fluidized bed reaction tower, and an inlet and an outlet of each bypass pipeline are respectively connected with the smoke chamber and the bottom of the second-order reaction zone; oxidizing agent adding openings are formed in an absorbent activator and a returning material activator, and activated absorbents and returning material ash directly enter the bottom of the first-order reaction zone. Through site digestion of calcium-based absorbents, structural improvement of the circulating fluidized bed reaction tower and optimization of operating parameters, on the basis of ensuring the desulfurization efficiency, the device strengthens the catalytic oxidation ability of the absorbents in the first-order reaction zone to NOx and gaseous elemental mercury (Hg0). The device realizes integration of desulfurization, denitration and demercuration through the reasonable combination of the first-order reaction zone and the second-order reaction zone.

The invention provides a middle-microporous compound titanium silicon molecule screen and relative preparation and application. It is characterized in that: it is belong to pure-phase molecule screen, with disordered worm-shape pore passage, while the middle holes are 20-30 and the micro holes are 5-9 and the wall of pore passage is mounted with the first and second structural units of microporous molecule screen. The preparation comprises two steps: first preparing the predecessors of first and second structural units of titanium silicon molecule screen; then using said predecessors to self assemble with long-chain alkylamine to attain said middle-microporous compound titanium silicon molecule screen. The invention has the advantages that: the composite condition is normal, and it has better catalytic oxidization properties in the reactions as oxidation desulfurization, olefin oxidization and styrene oxidization, etc.

The invention provides a method for preparing toluene catalytic combustion monolithic catalysts and application. The toluene catalytic combustion monolithic catalysts are Pd-based catalysts, a carrier for the toluene catalytic combustion monolithic catalysts is CeO2-Pr6O11 / Al2O3, CeO2-Pr6O11 mixed oxide with different Ce / Pr molar ratios is researched, accordingly, the optimal Ce / Pr proportions of the CeO2-Pr6O11 mixed oxide with the highest activity are found, and the toluene catalytic combustion monolithic catalysts are optimal in toluene catalytic oxidation activity when the Ce / Pr proportions are equal to 4:1. The method and the application have the advantages of excellent catalytic performance, low precious-metal content, good thermal stability and uniform coating.

The invention discloses a device for treating dirt materials of printing and dyeing wastewater. The device comprises a grid treatment tank, a filtering tank, an aeration treatment tank, a pool, an ejector, an ozone generator, a releaser, a water pump A, a water pump B and a water pump C, wherein a grid net is arranged inside the grid treatment tank; a water inlet tube is arranged on the left side of the grid net; a first water tube is arranged on the right side of the grid net; the first water tube is communicated with the filtering tank; the water pump A is arranged on the first water tube; a plurality of baffle plates are arranged from left to right in a staggered manner on the inner walls of two sides of the filtering tank; an activated carbon filtering net A is arranged at one end close to one inner wall of the filtering tank, of each baffle; the activated carbon filtering nets A prop against adjacent baffle plates and the inner walls of the filtering tank; and one side far away from the grid treatment tank, of the filtering tank, is communicated with the left side of the aeration treatment tank through a second water tube. By adopting the device, the activated carbon filtering nets can be highly utilized, and macromolecular organisms can be oxidized by ozone and ultraviolet light.

The present invention relates to a high catalytic activity graphene-Pd @ Pt core-shell structure nanoflower compound and a preparation method thereof. First, at room temperature, ascorbic acid is used for reducing an aqueous solution of graphene oxide and palladium chloride to obtain palladium nanoparticles with regular morphology and assemble the palladium nanoparticles in situ onto the chemically-reduced graphene, then the resulting graphene-palladium is used as a seed crystal, seed growth method is used, chloroplatinic acid is added into the reaction solution, and the microwave-assisted rapid reduction of the chloroplatinic acid is perforemed to obtain graphene supported Pd @ Pt core-shell structure nanoflower. The electrochemical data shows that under alkaline conditions, the catalytic oxidation activity of the graphene-Pd @ Pt core-shell structure nanoflower compound is much higher than that of a graphene-platinum-palladium alloy compound, and the graphene-platinum compound and a commercial platinum carbon catalyst show great potential as fuel cell electrode material. The preparation process is simple, materials are non-toxic and harmless, and Pd @ Pt core-shell structure nanoparticles monodispersed on the graphene can be obtained without adding of any additional surfactant.

The invention discloses a concave soil adsorption material carrying manganite and a method for removing S2- in tannery wastewater. First, a certain amount of concave soil water dispersion liquid going through special pre-treatment is prepared, and then a certain amount of manganese weak acid salt solution is added. Reaction occurs on proper conductions, and the concave soil adsorption material carrying manganite can be obtained after centrifugation, drying, grinding and calcination. A good adsorption effect can be achieved as long as a small number of adsorption materials are placed in tannery wastewater. According to the adsorption materials, preparation conditions are moderate, raw materials can be obtained easily. Moreover, when used for removing S2- in tannery wastewater, the adsorption materials are remarkable in adsorption effect and favorable to subsequent treatment of tannery wastewater, improves recovery rate, reduces cost for wastewater treatment, is incapable of generating bad influence on subsequent treatment, has the advantages of being efficient and protecting the environment, and has good application value.