70results about How to "Excellent visible light catalytic activity" patented technology

The invention relates to a graphene / titanium dioxide composite material, a preparation method and application thereof. The graphene / titanium dioxide composite material comprises: graphene and titaniumdioxide particles closely attached to the graphene sheet. According to the invention, graphene and titanium dioxide are selected for compounding to obtain an efficient photocatalyst with the excellent properties of graphene and titanium oxide simultaneously.

The invention discloses visible light catalyst of one dimension nanometer structure TiO2 adulterated with non-metal N, which is prepared with the following method: (1) with hydro-thermal method, nanometer TiO2 powder, TiO2 colloid or Ti(OH)4 and alkaline solution is mixed to form mixed suspension for water-thermal reaction; (2) after water-thermal reaction is finished, cooling is adopted, sediment is filtered and cleaned, and then white hydrogen titanium acid is realized; (3) hydrogen titanium acid, doping nitrogen source and water is mixed to form mixed suspension, ultrasound treatment is conducted after stirring, and then uniform mixture of hydrogen titanium acid and doping nitrogen source is realized after drying; (4) uniform mixture of hydrogen titanium acid and doping nitrogen source is calcinated and then visible light catalyst of one dimension nanometer structure TiO2 adulterated with non-metal N is realized. Catalyst provided by the invention has one dimension structure and lavish active point position and can accelerate mass transfer of pollutant to catalyst, and therefore photocatalysis rate is improved; special one dimension structure and non-nitrogen metal adulteration of the invention lead to good visible-light catalytic activity.

The invention provides preparation of a carnation-shaped p-n heterojunction copper sulfide nanometer material, and belongs to the technical field of nanometer materials. The preparation includes the steps that melamine is used as a raw material, carbon-doped graphene carbon nitrogen C-g-C3N4(CCN) is synthesized through hydro-thermal treatment and high-temperature calcination, and the carbon-doped graphene carbon nitrogen, copper chloride dihydrate and thiourea are further subjected to a hydrothermal reaction to synthesize a CCN-CuS p-n heterojunction; the p-n heterostructure reduces charge transfer resistance, enables photoinduced charges to be effectively separated and can effectively improve activity of photocatalyst. It is indicated through experiments that the prepared CCN-CuS p-n heterojunction nanometer material shows excellent visible-light catalytic activity and good cycling stability, and the degradation rate of rhodamin B can reach 92.6%. Therefore, the nanometer material can be used for degradation treatment on organic dyestuff waste water.

The invention discloses a method for preparing a nuclear-shell-structured rutile monocrystal titanium dioxide nanowire array with a surface-cladding carbon layer, and the method is characterized by comprising the following steps: (a) immersing a rutile monocrystal titanium dioxide nanowire array into a phenol aqueous solution or an aqueous solution of phenol and a precious metal salt, preparing arutile monocrystal titanium dioxide nanowire array with a surface-cladding polyphenol compound by using a photochemical reaction method, then taking out the rutile monocrystal titanium dioxide nanowire array with the surface-cladding polyphenol compound, washing with water, and drying; and (b) carrying out high-temperature pyrolysis on the rutile monocrystal titanium dioxide nanowire array with the surface-cladding polyphenol compound in the presence of inert gas to obtain the nuclear-shell-structured rutile monocrystal titanium dioxide nanowire array with the surface-cladding carbon layer. By means of the preparation method disclosed by the invention, clean and pollution-free solar energy can be fully utilized so as to effectively reduce the energy consumption for production and the production cost. The prepared nuclear-shell-structured rutile monocrystal titanium dioxide nanowire array with the surface-cladding carbon layer not only has stable and efficient photocatalytic activity, but also can achieve wide-spectrum response to visible light so as to obviously improve the photo quantum yield of the titanium dioxide nanowire array and improve the solar utilization rate, and can be widely applied to the fields of hydrogen production through photodecomposition of water, pollutant degradation through photocatalysis and the like.

The invention relates to a C3N4 / SiO2 heterojunction photocatalyst and a preparation method thereof. The method comprises the following steps that 2 g of melamine and a certain mass of nanosilicon dioxide are weighed; 10 ml of deionized water is added into the mixture; ultrasonic dispersion is performed for 4 h; the obtained suspension is stirred at the temperature of 90 DEG C for 12 h; then, the obtained solid is heated to 540 DEG C at the heating speed of 4 DEG C per min; the temperature is kept constant for 4 h; after natural cooling, the C3N4 / SiO2 heterojunction photocatalyst is obtained. The C3N4 / SiO2 heterojunction photocatalyst has the excellent organic pollutant degradation performance under visible light. According to the preparation method, the raw materials are cheap, and the method is simple, so that the product cost is effectively lowered, the visible light absorption range is enlarged due to composition of C3N4 and SiO2, the sunlight utilization rate is increased, and the high practical value and application prospect are achieved.

The invention relates to a Co3O4 / In2O3 heterostructure nanotube and a preparation method and application thereof. The nanotube is prepared from Co3O4 nanoparticles and In2O3 nanoparticles, wherein the particle size of the Co3O4 nanoparticles and the In2O3 nanoparticles is 10-20nm; the diameter of the nanotube is 100-200nm, and the wall thickness of the nanotube is 10-50nm. The Co3O4 / In2O3 heterostructure nanotube disclosed by the invention is of a hollow tubular structure and has good visible-light catalysis activity; under the irradiation of visible light, the Co3O4 / In2O3 heterostructure nanotube is used for photocatalytic oxidation degradation of methyl orange, and the degradation ratio within 3 hours can reach 95%; the preparation method is simple in step and low in cost, and the tube wall thickness of the nanotube is easy to control.

The present invention relates to a preparation method of a nanometer-scale composite photocatalyst. The preparation method of AgI / TiO2 nanometer-scale composite photocatalyst is characterized by comprising the steps as follows: firstly, two raw materials of AgNO3 and LiI.3H2 or LiI are selected for using according to the mol ratio of 1 to 1 of the AgNO3 to the LiI.3H2 or the LiI; secondly, the LiI.3H2 or the LiI is added into waterless ethanol to be processed by ultrasound to be dissolved, solution A with weight concentration of 1 percent to 10 percent is obtained, the AgNO3 is added into the waterless ethanol to be processed by the ultrasound to be dissolved, solution B with the weight concentration of 0.1 percent to 2 percent is obtained; thirdly, when being stirred by magnetic force, the solution A is dripped into the solution B to be mixed uniformly, butyl titanate is dripped; fourthly, the waterless ethanol is added, water is added for washing and to be dried, calcined and cooled naturally to obtain the AgI / TiO2 nanometer-scale composite photocatalyst. The preparation method has easily obtained raw material and simple technology and is easy to be industrialized; the prepared AgI / TiO2 nanometer-scale composite photocatalyst has stable performance and good visible photocatalysis activity.

The invention provides a high-stability TiO2 nanobelt-RGO-porous carbonitride composite photocatalyst, and a preparation method thereof. The preparation method comprises following steps: firstly, 0.2to 10g of P25 is weighed, and is added into 10 to 50ml of a 10M NaOH solution, stirring is carried out for 0.5 to 1h, at 200 to 600rpm stirring conditions, hydro-thermal reaction is carried out for 24to 72h at 120 to 180 DEG C, cooling is carried out, washing with 1 to 3M HCl is carried out for 0.5 to 1h, washing with water is carried out for 3 to 5 times until pH value is 7, drying is carried out for 12 to 24h at 50 to 80 DEG C so obtain TiO2 nanobelt; then 1 to 10ml of 2mg / ml oxidized graphene solution is added into 20 to 29ml of a mixed solvent of water and ethanol (V water : V ethanol=2:1), ultrasonic treatment is carried out for 0.5 to 1h, stirring is carried out and 0.1 to 0.5g of the TiO2 nanobelt is added, ultrasonic treatment is carried out for 5 to 20min, stirring is carried outfor 1 to 3h, hydro-thermal reaction is carried out for 5 to 10h at 150 to 250 DEG C, cooling and centrifugation are carried out, water washing is carried out for 3 to 5 times, drying is carried out for 12 to 24h at 50 to 80 DEG C to obtain TiO2 nanobelt-RGO; 5 to 10g of urea is subjected to roasting for 1 to 4h at 400 to 600 DEG C with 0.5 to 1.2ml / min nitrogen gas introduction, grinding is carried out to obtain Pg-C3N4; and at last, 0.02 to 0.5g of TiO2 nanobelt-RGO and 0.1 to 0.3g Pg-C3N4 are weighed and grinded to be uniform, and roasting is carried out for 1 to 4h at 400 to 600 DEG C with0.5 to 1.2ml / min nitrogen gas introduction to prepare the TiO2 nanobelt-RGO-Pg-C3N4.

The invention discloses a cuprous oxide fifty-surface crystallite as well as a preparation method and application thereof. According to the preparation method, copper acetate monohydrate is used as a copper source, water, strong base and glucose are respectively used as a solvent, a precipitator and a reducing agent, the reaction temperature is 50-80 DEGC, and the cuprous oxide fifty-surface crystallite is obtained through an oxidation-reduction reaction. The cuprous oxide fifty-surface crystallite prepared according to the invention is formed by closing 24 high-index crystal faces ({211} crystal face or {311} crystal face), 12 {110} crystal faces, 8 {111} crystal faces and 6 {100} crystal faces, and comprises 120 ridges and 72 vertexes. The method has the advantages of gentle reaction condition, simple equipment, convenient operation, low cost, high yield, environment protection, suitability for large-scale industrial production and the like. The crystallite has excellent visible light catalytic activity, and has wide application prospect in aspects of solar batteries, hydrogen production, lithium ion batteries, biosensors and the like.

The invention relates to the technical field of inorganic nano material science, in particular to a method for preparing a Magneli-phase titanium oxide mesoporous surface. The method comprises the steps: immersing a titanium substrate as an anode in an electrolyte, then applying a certain voltage between a cathode and the anode, performing cathodic glow discharge in the electrolyte so as to generate plasma, electrolyzing water through the plasma so as to generate hydrogen atoms and high-energy electrons, performing in situ hydrogenation reduction treatment on substances near the plasma, and inducing Mgeneli-phase titanium oxide mesopores to grow gradually out on the surface of the titanium substrate under the action of a synergistic effect of plasma reduction treatment and an anodic oxidation reaction, wherein after a specified discharge time is finished, a gray Mgeneli-phase titanium oxide mesoporous layer is formed on the surface of the titanium substrate of a certain thickness so asto obtain the Magneli-phase titanium oxide mesoporous surface. Induced growth of the Magneli-phase titanium oxide mesoporous structure is achieved on the surface of the titanium substrate through theaction of a synergistic effect of plasma reduction treatment and an anodic oxidation reaction.

The invention discloses a preparation method of a corn straw biochar-Bi2WO6 photocatalyst for efficiently degrading organic pollutants. The preparation method comprises the following steps: preparation of novel nitrogen-modified corn straw biochar N-Biochar: crushing corn straw into powder by using a crusher, then soaking 2 parts of straw powder into 1 part of a urea solution, carrying out dryingat 80 DEG C after soaking for 12 hours, and conducting roasting at 550 DEG C for 2 hours under a vacuum condition after drying; and preparation of the novel biochar-based photocatalyst Bi2WO6: dissolving 4 parts of sodium oleate into 40 parts of an ethylene glycol solution under heating, and then dissolving 4 parts of bismuth nitrate into the obtained mixed solution until the mixed solution is transparent. According to the invention, the corn straw is used for nitrogen modification to prepare novel g-C3N4-like nitrogen modified biochar and is coupled with the bismuth tungstate for the first time to prepare the novel biochar-based photocatalyst, and the photocatalyst has good visible light catalytic activity, and presents good photocatalytic degradation performance on rhodamine B dye and tetracycline hydrochloride pharmaceutical wastewater.

The invention relates to a preparation method of nitrogen doping titanium dioxide (TiO2) powder. The method which is low in cost, high in energy saving and capable of preparing the titanium dioxide powder with strong visible-light catalytic activity is characterized by including the following steps that (1) precursor powder is prepared; (2) a precursor block is prepared; (3) biological mineralization of the precursor block is conducted, wherein the precursor block obtained from the step (2) is used as a nucleus to be planted into the position between a pallium and a shell of a hyriopsis cumingii, then the hyriopsis cumingii is placed into fresh water to be cultivated, after 45-90 days, the hyriopsis cumingii is taken out to obtain the nucleus coated with a nacreous layer, and the nacreous layer on the outer surface of the nucleus is removed to obtain the nitrogen doping titanium dioxide powder; (4) purification is carried out on the nitrogen doping titanium dioxide powder. Due to the fact that the entire biological system environment is adopted, the synthetic process of the nitrogen doping titanium dioxide powder is conducted at normal temperatures and pressures, and the titanium dioxide powder with multi-aspect excellent properties such as good crystallinity, large specific surface area, good crystal form heat stability and strong visible-light catalytic activity is obtained at the same time.

The invention discloses a high visible-light catalytic activity material for a BiOCl / ZnO heterojunction and a preparation method thereof. The method comprises the steps of (1) preparing a solution A;(2) preparing a solution B; (3) mixing the solution A and the solution B to prepare into mixed liquor C; (4) dropwise adding a hexamethylenetetramine water solution into the mixed liquor C to obtain aflower-shaped BiOCl crystal; (5) respectively dissolving zinc acetate hexahydrate and hexamethylenetetramine into different deionized water to prepare into a solution I and a solution II; (6) mixingthe solution I and the solution II to form mixed liquor III; (7) uniformly mixing the mixed liquor III and BiOCl micro powder, reacting for 6 hours at 80 DEG C to 100 DEG C, naturally cooling after reaction, and washing, drying, cooling and grinding a product to obtain the high visible-light catalytic activity material for the BiOCl / ZnO heterojunction. The method is short in reaction time, mild inreaction condition and simple to operate. The BiOCl / ZnO heterojunction prepared through the method can absorb visible light, has photocatalytic activity of degrading rhodamine B under visible light,and has the characteristic of good photochemical stability.

The invention belongs to a practical technology in the field of environmental engineering and provides a manufacturing method of a biological carbon based on titanium dioxide photoactive (multilayered graphene / titanium dioxide) material. The environment-friendly type photocatalytic material with visible light activity is prepared through mainly taking waste animal feather, tetrabutyl titanate, absolute ethyl alcohol, potassium hydroxide and the like as raw materials, utilizing mutual effects of the materials at high temperature and carrying out an integrated heating, cross-linking and carbonization process. A preparation process accords with principles of simplicity, rapidness, greenness and high efficiency; the preparation cost of similar materials is greatly reduced. The prepared novel material has no toxin and harm, is convenient to recycle and has high catalytic efficiency and meets process and engineering requirements of water treatment.

The invention relates to doped and grafted nano TiO2 with the visible-light catalytic activity and a preparation method of the doped and grafted nano TiO2. The preparation method of the doped and grafted nano TiO2 comprises the following steps: firstly adding a dopant solution into TiCl4 solution, uniformly stirring and adjusting the pH value of the solution by ammonia water solution to generate sediment, filtering and washing the sediment until no chloridion is detected, then dispersing the sediment in deionized water, subsequently adding H2O2, uniformly stirring, heating and reflowing to obtain a doped nano TiO2 solution; then adding metal salt, heating and stirring, filtering, washing and drying the sediment to obtain the product. The doped and grafted nano TiO2 prepared by the method is capable of quickly degrading dyes such as methylene blue, has the remarkable visible-light catalytic activity and is mild in preparation condition, simple in preparation method and low in cost, and can be widely applied to fields of sewage treatment, antibacterial coatings, self-cleaning and the like.

The invention discloses a three-dimensional ordered macroporous (3DOM) BiVO4 loaded AgBr and Pd photocatalyst, preparation and application, belonging to the technical field of visible light response catalysts. A novel 3DOM BiVO4 loaded AgBr substance and Pd efficient visible light response nano hybridization photocatalyst is prepared by taking a 3DOM BiVO4 photocatalysis material as a carrier, adopting a PMMA microsphere hard template method, a low-temperature deposition-sedimentation method and a bubbling reduction method. The catalyst has a 3DOM structure, heterojunction and gradient structure surface as well as plasma resonance effect; AgBr is uniformly spread on the surface of a BiVO4 carrier; Pd is attached to the surface of the 3DOM structure in a nanocluster mode, and the specific surface area is 16m<2> / g, and the band gap energy is 2.49eV; the catalyst shows efficient visible light catalytic activity to degradation of parachlorophenol under the irradiation of visible light, and 4-CP is basically degraded completely after 150 minutes.

The invention relates to a graphene-CuInS2 nano composite photocatalyst, A preparation method of the graphene-CuInS2 nano composite photocatalyst is characterized by comprising the following steps offirstly preparing graphene oxide (GO) by using an improved Hummers method, and dispersing the GO into an organic solvent; dissolving an inorganic cuprous salt, an inorganic indium salt and a sulfur source in an organic solution; meanwhile, adding an already well prepared GO organic solution; reacting through a one-step solvothermal method; fixing a nano CuInS2 thin film on an atomic-scale-thickness graphene (rGO (Reduced GO)) thin film (rGO-CuInS2) with a chemical bond. When the content of the graphene is 0.1 to 10 percent, the rGO-CuInS2 nano composite photocatalyst has a unique surface structure, is larger in specific surface area, narrow in forbidden band width, high in stability, good in renewability and high in visible-light catalytic activity, can be used for efficiently treating actual medicinal wastewater and has the COD (Chemical Oxygen Demand) removal rate which can reach 86.5 percent.

The invention discloses a graphene composite comprising nitrogen-doped reduced graphene oxide and nitrogen-doped titanium dioxide nanowires, wherein the length-diameter ratio of the titanium dioxide nanowires is larger than 10. The one-dimensional titanium dioxide nanowires are selected as an active component, have better electronic transmission channels and are beneficial to acceleration of electronic transmission and increase of the reaction rate. Meanwhile, the one-dimensional titanium dioxide nanowires can better prevent stacking of graphene sheets, more effectively use the characteristic of large specific surface of graphene, enlarge the reaction contact area and increase the catalytic reaction rate. A preparation method of the graphene composite adopts a simple process, raw materials are easy to store, the reaction is mild, energy consumption is lower, and the method is suitable for industrial application. Meanwhile, the titanium dioxide nanowires with controllable morphology are prepared firstly, then the graphene composite is prepared, the product cost is reduced effectively, and product quality controllability can be realized.

The invention relates to a copper-nickel alloy nanowire / titanium dioxide composite material as well as a preparation method and application thereof. The copper-nickel alloy nanowire / titanium dioxide composite material comprises copper-nickel alloy nanowires and titanium dioxide granules which are grown on surfaces of the copper-nickel alloy nanowires in situ. The titanium dioxide granules are grown on the surfaces of the copper-nickel alloy nanowires by using a wet chemical method, so that the copper-nickel alloy nanowire / titanium dioxide composite material can be prepared, and the purposes that VOCs are effectively degraded and thus air is purified can be achieved when the copper-nickel alloy nanowire / titanium dioxide composite material is applied to photocatalytic acetaldehyde degradation under visible light.

The invention discloses a photocatalyst of an ordered mesoporous polymer loading with metal phthalocyanine and a preparation method of the photocatalyst, belonging to the technical field of chemical catalysts and synthesis of the chemical catalysts. The photocatalyst of the ordered mesoporous polymer loading with metal phthalocyanine is composed of a carrier and metal phthalocyanine loaded on the carrier; and the carrier is a chloromethylation FDU-type ordered mesoporous polymer prepared through a chloromethylation functional reaction, wherein the weight percent of metal phthalocyanine in the photocatalyst of the ordered mesoporous polymer loading with metal phthalocyanine is 0.2-1.2; and the rest is the chloromethylation FDU-type ordered mesoporous polymer. According to the invention, the photocatalyst has double functions of absorbing and photo-catalyzing, and possesses advantages of the ordered mesoporous polymer and the metal phthalocyanine; the metal phthalocyanine molecules are restricted in highly ordered mesoporous channels and in a monomolecular dispersing state; therefore, the aggregation of the metal phthalocyanine molecules is inhibited; and the photocatalytic activity of the metal phthalocyanine molecules is improved.

The invention discloses a Bi4V2O11 / g-C3N4 heterojunction photocatalyst and a preparation method and application thereof. The Bi4V2O11 / g-C3N4 heterojunction photocatalyst comprises Bi4V2O11 and g-C3N4,and the Bi4V2O11 accounts for 0.01-50% of the total weight of the Bi4V2O11 / g-C3N4 heterojunction photocatalyst. The preparation method of the catalyst comprises the following steps: dissolving a formula amount of g-C3N4 powder with ethylene glycol to obtain a g-C3N4 solution; then adding bismuth nitrate and ammonium vanadate, and stirring to obtain a uniform solution; transferring the solution into an autoclave for heat treatment to obtain a product, and washing and drying the product to obtain the Bi4V2O11 / g-C3N4 heterojunction photocatalyst. Bi4V2O11 accounts for 0.01%-50% of the total weight of the catalyst, wherein the molar ratio of the bismuth element to the vanadium element is 1.5-2.5: 1. The photocatalyst has excellent photocatalytic activity, excellent CO2 catalytic reduction performance and long catalytic life. The process is simple, and cost is low.

The invention discloses a preparation method of a nano zinc oxide / cyclized polyacrylonitrile composite micro-sphere material with zinc oxide nano particles uniformly distributed in a polymer and belongs to the technical field of a novel material of an environment purification photocatalyst. The preparation method comprises the following steps: firstly, dissolving polyacrylonitrile and zinc nitrate solids into a dimethyl sulfoxide solvent; slowly dripping a mixed solution into a diluted ammonia water solution; condensing polyacrylonitrile into micro-spheres in water and enabling zinc nitrate and hydroxyl ions to react to generate zinc hydroxide in situ to obtain composite micro-spheres with zinc hydroxide nano particles uniformly distributed in polyacrylonitrile; and then separating, washing, drying and baking under inert gas to obtain the nano zinc oxide / cyclized polyacrylonitrile composite micro-sphere material. The preparation method has the advantages that the preparation method is simple, complicated equipment is not needed, used polyacrylonitrile has a cheap price and is easy to obtain and the zinc oxide nano particles are uniformly distributed in the cyclized polyacrylonitrile composite micro-spheres; and the prepared composite micro-sphere material has excellent visible-light catalytic activity.

The invention discloses a visible light catalysis water permeable brick and a manufacturing method and application thereof. The visible light catalysis water permeable brick comprises a water permeable brick base body and further comprises a visible light catalysis layer on the surface of the water permeable brick base body, the visible light catalysis layer is a Fe2O3 / g-C3N4 composite coating, and the visible light catalysis water permeable brick is prepared by coating the Fe2O3 / g-C3N4 visible light catalysis coating on the water permeable brick base body. The preparation method comprises thefollowing steps: preparing the Fe2O3 / g-C3N4 visible light catalytic composite material, uniformly mixing the Fe2O3 / g-C3N4 visible light catalytic composite material with silica sol, a potassium silicate aqueous solution, a silane coupling agent, a leveling agent, a dispersing agent, an antifoaming agent and a thickener to obtain a coating, and coating the surface of the water permeable brick basebody with the coating to form the Fe2O3 / g-C3N4 composite coating. The visible light catalysis water permeable brick is high in sunlight utilization rate, strong in absorption capacity, high in visible light catalysis efficiency, and capable of adsorbing and effectively catalyzing organic pollutants and motor vehicle tail gas, purifying rainwater and preventing blockage.

The invention discloses a preparation method of a meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst. Modified meerschaum is used as a carrier and Bi2WO6 is modified by porphyrin as a sensitizing agent so that the meerschaum-loaded porphyrin-sensitized Bi2WO6 visible light-driven photocatalyst is obtained. The photocatalyst has excellent visible light-driven photocatalytic activity and substantially improves photoinduced electron and cavity separating efficiency and sunlight clean energy utilization efficiency. Through carrying reinforcement of porphyrin-sensitized Bi2WO6 with modified meerschaum with a large specific surface area and stable performances, the visible light-driven photocatalyst has obvious adsorption and enrichment effects on pollutant molecules.

The invention discloses a method for preparing a reusable and efficient g-C3N4-based composite photocatalyst, and belongs to the technical field of photocatalysis. The method for preparing the reusable and efficient g-C3N4-based composite photocatalyst comprises the following steps that S1, deionized water is added to a carbon and nitrogen source, and the mixture is vigorously stirred to obtain asettled solution for standby application; S2, iron salt is added to the settled solution obtained in the S1, the mixture is continued to be stirred to enable the mixture to be fully mixed and then dried until the solution completely evaporates, and powder is collected; S3, the powder obtained in the S2 is placed in an inert gas atmosphere, the mixture is calcined at 500 DEG C-600 DEG C for 1-3 h,and the mixture is cooled naturally to room temperature; and S4, a product obtained in the step S3 is washed with anhydrous ethanol and deionized water three times each, and the product is subjected to centrifugal separation and then dried to obtain the g-C3N4-based composite photocatalyst. The prepared g-C3N4-based composite photocatalyst can achieve efficient degradation of methyl orange throughphotocatalysis under the action of sunlight, and has the advantages of being recyclable and reusable and high in degradation efficiency.

The invention discloses a photocatalysis reaction device for treating rose red B high-salt wastewater and a process. Thephotocatalysis reaction device comprises a transparent shell, wherein the transparent shell is internally provided with an aerator; a light focusing membrane is arranged below the aerator. By adopting the process, rose red B high-salt wastewater is treated by using the photocatalysis reaction device. The photocatalysis reaction device disclosed by the invention has the advantages of being simple in structure, low in cost, high in light source utilization rate, wide in application range, and the like, can be widely applied to treatment on rose red B high-salt wastewater, is capable of achieving effective degradation of rose red B in high-salt wastewater, and has high use values and good application prospects. The process for treating the rose red B high-salt wastewater by using the photocatalysis reaction device, which is disclosed by the invention, has the advantagesof being simple in process, good in treatment effect, good in universality and the like, is capable of achieving efficient removal of the rose red B in the high-salt wastewater, and has great significances for effective treatment on the rose red B in the high-salt wastewater.

The invention discloses an advanced treatment method for electroplating wastewater. The advanced treatment method comprises the following steps: step 1, pretreatment; step 2, coagulating sedimentation; step 3, electrochemical-photocatalysis-ozone synergistic treatment; step 4, treatment by a cation exchange resin column; step 5, treatment in a biological aerated filter; and step 6, nanofiltrationand reverse osmosis treatment. The process steps are matched with one another, the layout is compact, the floor area is small, and the energy consumption is low. Oil is removed through pretreatment, suspended matters, cyanides and colloids are removed through coagulating sedimentation, nitrogen and phosphorus can be removed through electrochemical-photocatalysis-ozone synergy, organic contaminantsare thoroughly removed, most heavy metal ions are removed through treatment by the cation exchange resin column, the biological aerated filter is capable of remarkably improving water quality, reducing the workload of a subsequent membrane system and removing residual trace organic pollutants and heavy metal ions, and finally desalination is carried out by virtue of nanofiltration and a two-stagereverse osmosis system, so that the effluent quality meets the electroplating wastewater discharge standard GB21900-2008.

The invention relates to a Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction and a preparation method and application thereof. The method comprises the following steps: (1) dissolving a bismuth salt in water; (2) adding aqueous solution of sodium oxalate into bismuth nitrate solution; (3) reacting at a certain temperature for a certain time; (4) cooling; (5) washing and drying; (6) dissolving a proper amount of precursor, a surfactant and carbonate in a certain amount of water; (7) adding a certain amount of bismuth salt; (8) cooling; and (9) washing and drying, thereby obtaining the Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction. The one-dimensional Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction is synthesized, and the performances of catalysis and adsorption are integrated into a whole. The catalyst has an excellent visible light catalytic degradation effect on high-concentration dye rhodamine B (RhB) and has high optical stability and reusability. More important, the Bi2O2CO3-Bi(OHC2O4).2H2O heterojunction has good adsorption function on the dye rhodamine B (RhB) and methylene blue (MB) in a short time (within 5 minutes), and also has excellent adsorption performance on the dye methyl orange (MO). The saturated adsorption amount of 40mg of Bi2O2CO3-Bi(OHC2O4).2H2O nanometer composite material on MO is 94mg / g, the MO can be desorbed by adding ethanol to wash, and the adsorbent can be repeatedly used.

The invention relates to a preparation method of a photocatalytic net loaded with carbon nitride, and belongs to the technical field of photocatalyst preparation. The preparation method comprises thesteps: mixing an inorganic adhesive with ultrathin carbon nitride powder, carrying out ultrasonic treatment, spraying the mixed solution of ultrathin carbon nitride and the adhesive onto a cotton fiber net, and waiting for drying to obtain the photocatalytic net loaded with carbon nitride. The carbon nitride photocatalyst is loaded on the cotton fiber net by using the adhesive, so that the problemof immobilization of a powder catalyst is solved; and meanwhile, the photocatalytic net has a relatively good treatment effect when being applied to the aspect of water treatment. The method is simple in process and low in cost, is suitable for the field of water treatment, and has certain application prospect and use value.

The invention belongs to the field of nano composite material preparation, and particularly relates to a preparation method of a CdS nanoparticle modified graphene (GE) / gamma-Fe2O3 composite photocatalyst. The preparation method mainly includes steps: using a hydrothermal method to synthesize cubic Prussian blue (PB) nanoparticles; ultrasonically dispersing the PB particles in deionized water, and adding polyacrylamide hydrochloride to enable the PB particles to carry positive charge; sequentially adding uniform graphite oxide dispersion and cadmium nitrate solution, and stirring; adding sodium sulfide solution, stirring for reaction, and collecting a product; heating the product in an argon atmosphere to 350 DEG C at a rate of 2 DEG C min-1, and holding the temperature to obtain a final product. The composite photocatalyst is a good visible light catalyst and has photocatalysis degrading effect on organic pollutant, Rhodamine B.