447 results about "Silver phosphate" patented technology

The invention discloses a high-efficiency graphene / silver phosphate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of composite materials and environmental management photocatalysis. The preparation method comprises the following steps: dissolving graphene oxide in water, and carrying out ultrasonic treatment to obtain a graphene oxide dispersed liquid; dissolving silver nitrate in deionized water, gradually and dropwisely adding into the graphene oxide dispersed liquid while stirring to obtain a mixed solution, uniformly stirring, and aging; dropwisely adding a prepared disodium hydrogen phosphate or sodium dihydrogen phosphate solution into the graphene oxide-silver nitrate mixed solution, continuing stirring, transferring into a hydrothermal reaction kettle, carrying out hydrothermal reaction, and cooling to room temperature; and washing the reaction product, and carrying out vacuum drying to obtain the visible light photocatalyst. The invention has the advantages of wide material sources and simple preparation process; and the obtained composite material has the advantages of controllable structure and regular pattern, and has high-efficiency degradation effect on organic dyes rhodamine B and methylene blue with certain concentration under the visible light irradiation.

The present invention provides a novel visible catalyst-silver phosphate and a preparation method thereof, solving the problems of wide TiO2 forbidden band, no absorbability of visible weakness, and the like in the prior art and applying Ag3PO4 to the field of photocatalysis for the first time. In the invention, a silver ammonia solution for replacing a silver nitrate solution is used as a silversource, the reaction of silver ions and phosphate ions is slowed, and then the catalyst is obtained and has the effect of high-efficiency photocatalytic degradation. The preparing method of the invention is simple and is favorable to extensive popularization.

An antibacterial composite TiO2 particle modified by silver phosphate for paint, ceramics, rubber, etc. is prepared from nanometre-class or submicron-class TiO2 particle as kernel through coating SiO2 layer, alumina layer, or SiO2-alumina layer, and coating silver phosphate layer. Its advantages are high purity dispersity and sure antibacterial action.

The invention relates to nano-silver antibacterial melt-blown non-woven fabric and a production method thereof. The nano-silver antibacterial melt-blown non-woven fabric is characterized in that the fabric contains hybrid nanoscale antibacterial powder, a non-woven fabric base stock can be polypropylene, polyester or polyphenylene sulfide, the hybrid nanoscale antibacterial powder is formed in a way that nanoscale zirconium phosphate and silver nitrate are exchanged in water to form silver phosphate, zinc oxide needs to be added in the exchange process, and the antibacterial powder has the proportion of ingredients as follows: 2-5 percent of the silver nitrate, 90-95 percent of the zirconium phosphate and 1-5 percent of the zinc oxide. The nano-silver antibacterial melt-blown non-woven fabric has excellent inhibition and stop effects on escherichia coli, staphylococcus aureus, Candida albicans and the like, and can filter various particles with the pm (particulate matter) over 2.5 in current air haze, the filter efficiency is over 95 percent, and the antibacterial ratio is over 99 percent; the fabric is tested by sgs (Societe Generale de Surveillance); the prepared nano-silver antibacterial melt-blown non-woven fabric is good in strength, not easy to break, soft and comfortable.

An antibacterial composition for paint, ceramics, rubber, plastics, etc. is composed of microporous or mesoporous SiO2 particles as carrier and silver phosphate and / or TiO2 as active components which are compounded on the surface of the said SiO2 particle. Its advantages are high antibacterial effect, high hydrophilicity and low cost.

The invention relates to a preparation method of antibacterial fiber. A melting spinning process is adopted in the preparation method, two screw machines are respectively used for supplying materials to a core-skin spinneret plate assembly, and the core components of the core-skin spinneret plate assembly comprise a melt processed hydrophilic polymer of an inorganic antibacterial agent with the weight percentage of 0.1-10 and grain size of 100nm to 10mum; the inorganic antibacterial agent comprises one of silver zeolite, silver silica gel, silver phosphate, silver silicate and titanium oxide; and the hydrophilic polymer comprises one of polyoxyethylene, polyoxypropylene and kollidon. The preparation method of the antibacterial fiber is characterized in that controllable air flow is injected into the core components by using a gas flowmeter while the core components are supplied, so that a core layer is made into a structure with one or more hollow holes and core components are mainly distributed on the walls of the hollow holes in the core layer; the core layer of the hollow holes accounts for 5-60 percent of the total volume of the fiber; and the weight ratio of the core components to a skin component is (1-20):(99-80).

The invention relates to a preparation method of a ZnFe2O4 / Ag3PO4 composite photocatalyst, belonging to the technical field of environmental material preparation. An ion exchange technique is adopted for the invention, and the preparation method comprises the steps of firstly, feeding FeCl3.6H2O solid and ZnCl2 solid into ethylene glycol, evenly stirring, then feeding sodium acetate (NaAC) and polyethylene glycol (PEG) into the mixture, continuously mixing, and carrying out a reaction to obtain ZnFe2O4 nanospheres; after that, feeding the ZnFe2O4 nanospheres into deionized water, rapidly stirring, dropwise adding a disodium hydrogen phosphate solution, carrying out a reaction, then dropwise adding a silver nitrate solution, stirring until reactants have a full reaction, washing the product, and then carrying out vacuum drying on the washed product to obtain the ZnFe2O4 / Ag3PO4 composite photocatalyst. A composite visible light photocatalyst system is established; a heterogeneous structure system is established, so that the activity and the stability of silver phosphate can be improved; furthermore, the photocatalyst can be efficiently recovered by using the ZnFe2O4; the composite photocatalyst has a better degrading effect for the antibiotics in waste water.

The invention discloses a synthetic method for a supported silver phosphate / silver catalyst. The synthetic method includes steps of weighing 1-1.2mmol of silver nitrate to prepare 10-15mmol / L of solution at first and dripping weak aqua ammonia into the solution to obtain Tollens' reagent; then weighing 20g of bentonite; adding 80-100mL of distilled water into the bentonite to immerse the bentonite for 10 hours to 12 hours so as to obtain bentonite suspension; dripping the Tollens's reagent into the bentonite suspension, stirring, ageing in water bath at the temperature ranging from 80 DEG C to 85 DEG C for 24 hours, washing by four times to five times, and adding 30-50mL of distilled water; dripping 0.01-0.1mol / L of phosphoric acid in a product, stirring for 4 hours, leading the mole ratio of the adding quantity of the phosphoric acid to the used quantity of the silver nitrate to be 1:3, ageing in water bath at the temperature ranging from 60 DEG C to 65 DEG C for 24 hours after stirring is finished, and repeatedly washing until supernate is neutral; and finally drying at the temperature of 105 DEG C, grinding, and irradiating under an xenon lamp with the power of 400-500w for 50-80 minutes so as to obtain the supported silver phosphate / silver catalyst. Utilization efficiency to natural light is increased, stability of a system is guaranteed, a nanometer laminated structure of the bentonite is utilized, accordingly, absorption ability of the catalyst and a carrier is improved, and degradation efficiency is increased.

The invention discloses a synthesizing method of a playgouskite-loaded silver orthophosphate photochemical catalyst, which belongs to the technical filed of sewage treatment in environmental protection. The method comprises the flowing steps of mixing 20 mmol / L of silver nitrate solution and 20 mmol / L of disodium hydrogen phosphate solution at a rotation speed of 350-400 rpm, and continuously mixing for 3-4 h so as to obtain silver nitrate colloid; and adding 5-8 g of attapulgite into 50-60 ml of water, dispersing under ultrasonic waves for 60-70 min, adding into the silver nitrate colloid, stirring for 6-8 h, aging for 24 h, centrifuging, collecting solid, and drying at temperature of 105 DEG C so as to obtain the catalyst. According to the method, the nano rod-shape large outer surface of the attapulgite is utilized, silver nitrate is loaded on the outer surface so that the light can be received advantageously , the generated silver nitrate colloid is easily attached to the huge outer surface of the attapulgite and can be distributed uniformly, further the outer surface of the attapulgite can be utilized effectively, and the silver nitrate still can play a nano effect and can be speared from the water.

The invention discloses a synthetic method of a supported silver phosphate photocatalyst. The method comprises the following steps of: weighing 1-1.2mmol of silver nitrate, preparing into 10-15mmol / L of solution, and dropwise adding diluted ammonia water to obtain a silver ammonia solution; weighing 20g of bentonite, adding 80-100mL of distilled water, soaking for 10-12 hours to obtain a bentonite suspension, dropwise adding the silver ammonia solution into the bentonite suspension, continually stirring for 3-4 hours, ageing in a water bath of 80-85 DEG C for 24 hours, washing with water for 4-5 times, and adding 30-50mL of distilled water; and dropwise adding 0.01-0.1mol / L of phosphoric acid into an obtained product in the molar ratio of 1:3 of phosphoric acid to used silver nitrate, ageing in a water bath of 60-65 DEG C for 24 hours, washing with water repeatedly till a supernatant becomes neutral, and drying at the temperature of 105 DEG C to obtain the supported silver phosphate photocatalyst. The adsorption capabilities of the catalyst and a carrier are increased.

The invention provides a graphene oxide / silver phosphate composite visible light catalyst and a preparation method of the graphene oxide / silver phosphate composite visible light catalyst, belonging to the technical field of nano-composite material and photocatalysis. The preparation method comprises the following steps of: dissolving graphene oxide in water, and ultrasonically treating to obtain graphene oxide dispersing liquid; adding silver acetate into the graphene oxide dispersing liquid, and evenly stirring, to obtain mixed solution; slowly dropping prepared disodium hydrogen phosphate or sodium dihydrogen phosphate solution into the mixed solution of the graphene oxide and the silver acetate to continuously stir for a while; and repeatedly washing products obtained by reaction with deionized water and absolute ethyl alcohol, and carrying out vacuum drying to obtain the graphene oxide / silver phosphate nano-composite visible light catalyst. The invention has the advantages that the invention is wide in raw material source, and simple in preparation process, the obtained composite material is better in structure and feature, and the prepared nano-composite light catalyst is high-efficiency in degradation effect to the organic dyestuff rhodamine B and the methylene blue under the irradiation of visible light due to the structural advantage.

The invention discloses a preparation method for a silver phosphate / molybdenum disulfide compound visible-light-driven photocatalyst. The silver phosphate / molybdenum disulfide compound visible-light-driven photocatalyst is formed by loading silver phosphate onto a molybdenum disulfide flaky material, the mass ratio of the silver phosphate and molybdenum disulfide is 1.0:(0.005-0.015). The preparation method comprises steps of firstly preparing the molybdenum disulfide flaky material through a hydrothermal method, then mixing with silver ions so as to obtain a uniform solution, adding phosphate radical ions for stirring and reacting, then filtering, and carrying out vacuum drying on the obtained filter cakes so as to obtain the silver phosphate / molybdenum disulfide compound visible-light-driven photocatalyst. The silver phosphate / molybdenum disulfide compound visible-light-driven photocatalyst has high reactivity when being used for photocatalysis and degradation of organic pollutant rhodamine B, and the preparation method is simple and easy to operate, has low production cost, has no contamination in the production process, and is suitable for industrial scale production.

The invention discloses a preparation method of a halloysite loading phosphoric acid Silverlight catalyst. The preparation method comprises the following specific steps of adding halloysite in a salpeter solution so as to obtain the halloysite after acid treatment, placing the 4-8g halloysite after acid treatment into a vacuum filtration bottle, mixing the halloysite and a silver nitrate ethanol solution under a vacuum state, enabling the silver nitrate to fully enter a halloysite pipe, sequentially stirring 2-5h, carrying out solid-liquid separation, and vacuum drying at 70-80 DEG C; adding the obtained product after drying in a 50 mL of sodium dihydrogen phosphate solution the concentration of which is 0.5-1.5mol / L, stirring for 4-5h, carrying out solid-liquid separation, washing, drying at 100-105 DEG C so as to obtain the halloysite loading phosphoric acid Silverlight catalyst. The preparation method provided by the invention has the advantages that the air and moisture in a halloysite pipeline are discharged, the silver nitrate enters a pipeline, an aluminum oxide of the inner wall of the halloysite is removed, the effects of increasing light penetrating degree and aperture property action can be achieved, the obtained silver phosphate particles are arranged in a halloysite pipe and are prevented from birdnesting and falling.

The invention relates to the technical field of photocatalysis, particularly to a micronano-structured and silver phosphate based composite visible light catalytic material and a preparing method thereof. The method includes the following steps: dissolving oxidized graphene in water, and performing ultrasonic treatment to obtain an oxidized graphene dispersion liquid; ultrasonically dispersing silver nitrate and zinc oxide in deionized water to obtain a mixed solution, stirring and dropwise adding the solution into the oxidized graphene dispersion liquid, so as to obtain a mixed precursor; slowly and dropwise adding a prepared phosphate solution in the mixed precursor of the oxidized graphene, the silver nitrate and the zinc oxide, and continuously stirring, performing suction filtration on the product, then repeatedly washing the product by the deionized water and absolute ethyl alcohol, and obtaining a composite after vacuum drying. The invention has the advantages that the preparing technology is simple, the required raw materials are abundant, the performance of the product is superior, and motivated by visible light, the catalytic material has stronger degradation activity to organic dyestuff rhodamine B.

The invention specifically relates to a preparation method for a recyclable photocatalysis material, belonging to the field of photocatalysis technology. The preparation method comprises the following steps: subjecting an aqueous solution of CaCl2 and an aqueous solution of Na2HPO4.12H2O to a hydrothermal reaction so as to obtain hydroxyapatite powder; then preparing carbon points from any one selected from a group consisting of glycol, citric acid and glucose; preparing hydroxyapatite / carbon point composite powder from the hydroxyapatite powder and the carbon points; adding an aqueous solution of AgNO3 into the hydroxyapatite powder to prepare a hydroxyapatite / silver phosphate composite system; and adding the hydroxyapatite / carbon point composite powder into an aqueous solution of AgNO3 so as to obtain a hydroxyapatite / carbon point / silver phosphate composite system. The hydroxyapatite / carbon point / silver phosphate composite system has improved light absorption and photocatalysis capabilities and enhanced stability and repeated usability.

The invention discloses a silver phosphate / nitrogen-doped carbon quantum dot / bismuth vanadate Z type photocatalyst, a preparation method and application thereof. The Z type photocatalyst adopts bismuth vanadate as the carrier, and the bismuth vanadate is modified with nitrogen-doped carbon quantum dots and silver phosphate. The preparation method includes: preparation of a nitrogen-doped carbon quantum dot modified bismuth vanadium material; and mixing of the nitrogen-doped carbon quantum dot modified bismuth vanadium material with silver nitrate and disodium hydrogen phosphate dodecahydrate in water so as to obtain the Z type photocatalyst. The Z type photocatalyst provided by the invention has the advantages of high light absorption efficiency, high photoinduced electron-cavity separation efficiency, high photocatalytic activity, strong redox ability and the like, can efficiently degrade antibiotic wastewater, also has the advantages of simple application method, high degradation efficiency and good reutilization, and has good practical application prospect. The preparation method provided by the invention has the advantages of simple preparation process, easily controllable operating conditions, simple and easily available raw materials, low preparation cost and the like, and is suitable for continuous and large-scale mass production.

The invention belongs to the technical field of environment functional materials and relates to a preparation method and application of a C3N4 composite catalytic membrane. The preparation method comprises the following steps: firstly, dissolving AgNO3 and g-C3N4 into water to obtain a solution A; dropwise adding a Na3PO4 solution into the solution A, stirring, washing, centrifugally separating and drying to obtain a binary composite semiconductor material C3N4@Ag3PO4; secondly, dissolving dopamine into a Tris-HCl solution, putting a PVDF membrane into the solution, modifying the dopamine, depositing a polydopamine layer on the surface of the PVDF membrane, and carrying out room temperature drying on the obtained polydopamine modification membrane (PDA@PVDF); dissolving the C3N4@Ag3PO4 into the water, and carrying out ultrasonic dispersion to obtain C3N4@Ag3PO4 suspension; taking PDA@PVDF as a base membrane, and carrying out vacuum filtration and room temperature drying. A silver phosphate nanomaterial is loaded with a graphite nitrogen carbide nano-sheet to form point-surface contact, so that compounding of C3N4 photo-induced electron hole pairs is inhibited, the stability of Ag3PO4 is improved and further the photocatalytic activity is improved; the C3N4@Ag3PO4 is loaded on the PVDF membrane, so that the problems that catalyst powder is difficult to recover and easy to waste,and membrane holes are blocked because of membrane pollution are solved; the removal rate of pollutants is improved.

The invention discloses a silver phosphate / oxygen vacancy type titanium dioxide compound photocatalyst and a preparation method thereof. The silver phosphate / oxygen vacancy type titanium dioxide compound photocatalyst is formed by loading visible light photocatalyst silver phosphate on oxygen vacancy type titanium dioxide, wherein the mass ratio of the silver phosphate to the oxygen vacancy type titanium dioxide is 1.0 to (0.015-2.0). The preparation method comprises the following steps: firstly, preparing an oxygen vacancy type titanium dioxide material and mixing the oxygen vacancy type titanium dioxide material with silver ions to prepare a uniform solution; adding phosphate ions, carrying out a stirring reaction and filtering; and drying an obtained filtering cake in vacuum to prepare the silver phosphate / oxygen vacancy type titanium dioxide compound photocatalyst. The silver phosphate / oxygen vacancy type titanium dioxide compound photocatalyst disclosed by the invention has the high reaction activity on photocatalytic degradation of an organic pollutant Rhodamine B. The preparation method is simple and feasible and low in production cost, has low pollution in a production process and is suitable for industrialized large-scale production.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a heterojunction nanosheet photocatalyst and a preparation method and application of the heterojunction nanosheet photocatalyst. A visible light responsive heterojunction photocatalytic material is prepared from silver nitrate, disodium hydrogen phosphate, nitric acid, ammonia water, and sodium tungstate as raw materials by utilizing a hydrothermal method and a precipitation method. The photocatalyst is made from a silver phosphate / tungsten oxide heterojunction photocatalytic material formed by tungsten oxide and silver phosphate, tungsten oxide is in a nanosheet shape, silver phosphate is in a particle shape, the silver phosphate nano-particles uniformly grow on the surfaces of the tungsten oxide nanosheets, and the molar ratio of tungsten oxide to silver phosphate is 1 to (0.3-1.8). The visible light responsive heterojunction photocatalytic material prepared by the method is used for degrading a methylene blue trihydrate dye, and the degradation rate can reach 97% after the degradation is carried out for 20 minutes.

The invention relates to an antibacterial ceramic tile and a preparation method thereof, belonging to the technical field of ceramic production. The antibacterial ceramic tile comprises the following components in parts by weight: 60-90 parts of kaolin, 30-40 parts of ceramic clay, 1-10 parts of quartz, 1-10 parts of potassium feldspar, 0.1-0.5 part of silver phosphate and 1-5 parts of copper oxide. The preparation method comprises the following steps: mixing the substances uniformly in proportion, controlling the pressure to be 30-40MPa, carrying out compression moulding on powder, then drying the powder at 50-60 DEG C for 4-6 hours, putting a product obtained after drying into a firing furnace, controlling the temperature to be 1200-1300 DEG C, firing for 1-2 hours, reversing a mould and cooling the product, thus obtaining the antibacterial ceramic product. The ceramic tile has stable antibacterial property and wide application range.

The invention discloses a silver phosphate / titanium dioxide nanocomposite. The silver phosphate / titanium dioxide nanocomposite is formed by silver phosphate nanoparticles and titanium dioxide nanofibers according to a mole ratio of (0.2-2) to 1, wherein the silver phosphate nanoparticles are loaded on the surfaces of the titanium dioxide nanofibers to form heterojunctions. A preparation method of the silver phosphate / titanium dioxide nanocomposite comprises the following steps: (1) preparing a spinning solution from butyl titanate, polyvinylpyrrolidone, dimethylformamide and an acid solution, and preparing titanium dioxide nanofibers by an electrostatic spinning manner; (2) dispersing the titanium dioxide nanofibers in deionized water, adding silver salt, and stirring without light; (3) preparing a dihydric phosphate solution, dropwise adding the dihydric phosphate solution into the solution prepared by the step (2) by magnetically stirring without light, and reacting to obtain the silver phosphate / titanium dioxide nanocomposite. The composite has double functions and are relatively high in catalytic activity in an ultraviolet light area and a visible light area. The method is simple and liable to operate, high in repeatability, mild in synthesis condition and low in cost, and is suitable for industrial production.

The invention provides an antibacterial and anti-fingerprint composite film and a preparation method thereof. The composite film comprises a protecting film base layer, a protecting film adhesive layer, an antibacterial and anti-fingerprint function layer, a functional base layer, a functional adhesive layer and a stripping layer which are contacted sequentially, wherein the antibacterial and anti-fingerprint function layer is formed by applying an antibacterial and anti-fingerprint function coating, the antibacterial and anti-fingerprint function coating is prepared from components as follows: 15-37 parts of acrylic monomers, 2-15 parts of an auxiliary film-forming agent, 25-50 parts of an organic solvent, 0.2-2 parts of a photoinitiator, 0.3-5 parts of fluorine-containing resin and 1-9 parts of silver-containing nanoparticles; the silver-containing nanoparticles are selected from one or more of silver carboxyl apatite, zirconium sodium silver phosphate, silver-containing zeolite, silver-containing sodium borate silicate and silver / copper-containing titanium dioxide / silicon dioxide. The composite film has excellent antibacterial and anti-fingerprint properties and excellent wear resistance and hardness.

The invention discloses a preparation method of a PVDF (polyvinylidene fluoride) film modified by silver phosphate modified nano negative ion powder. The preparation method comprises the steps of firstly, obtaining nano silver phosphate by adopting an ion exchange method, and modifying negative ion powder by nano silver phosphate to obtain negative ion powder with different silver carrying capacity; secondly, adding a proper amount of the silver-carrying negative ion powder into a PVDF casting film solution, and preparing the modified PVDF film containing the silver-carrying negative ion powder by adopting a phase inversion method. By virtue of peculiar nanometer size effect and surface energy of the silver-carrying negative ion powder, the PVDF film is endowed with effective anti-biological-pollution capability, the hydrophilicity of the PVDF film is improved, and the flux recovery rate of the PVDF film is increased; in addition, the preparation method of the modified PVDF film is simple and easy to adjust and control.

The invention discloses a preparation method of a metavanadic silver / silver / silver phosphate composite catalyst. The preparation method comprises the following specific steps: mixing the prepared AgNO3 solution with the concentration of 20 mmol / L and thiourea-containing Na2HPO4 solution with the concentration of 20 mmol / L to prepare thiourea-doped silver phosphate colloid; dripping NH4VO3 solution into the AgNO3 solution while stirring; washing and drying to obtain AgVO3 particles; reducing the AgVO3 particles by utilizing NaBH4 to obtain silver / metavanadic silver particles; finally adding the silver / metavanadic silver particles into the thiourea-doped silver phosphate colloid, stirring and drying to obtain the metavanadic silver / silver / silver phosphate composite catalyst. The metavanadic silver / silver / silver phosphate composite catalyst has a good visible light absorption effect, and can transfer photo-generated electrons effectively, and avoid the combination with electron holes.

The invention discloses a preparation method of a silver phosphate / graphite phase carbon nitride composite photocatalyst. The preparation method comprises: preparing g-C3N4 through thermal condensation polymerization of urea, carrying out ultrasonic treatment on the prepared g-C3N4 while mechanically stirring to uniformly disperse the g-C3N4 in water, adding AgNO3, dissolving, and adding a Na2HPO4solution in a dropwise manner under ultrasonic vibration to obtain the Ag3PO4 / g-C3N4 composite photocatalyst. According to the present invention, the Ag3PO4 / g-C3N4 composite photocatalyst is preparedby using the ultrasonic assisted precipitation method, wherein the crystallinity and the dispersibility of the crystal are increased by using the unique characteristics of ultrasonic cavitation phenomenon and strong mechanical oscillation of ultrasonic waves so as to prepare the composite material with the small particle size, and the heterojunction formed between the Ag3PO4 and the g-C3N4 can significantly improve the separation efficiency of photogenerated hole-electron pairs so as to efficiently degrade organic dyes.

The invention relates to photocatalytic materials, and particularly relates to a visible-light response graphite-like alkene molybdenum disulfide / silver phosphate composite photocatalyst and a preparation method thereof. Modification treatment is performed on silver phosphate photocatalyst through utilizing graphite-like alkene molybdenum disulfide, so that the graphite-like alkene molybdenum disulfide / silver phosphate composite material is obtained, the composite material can greatly improve the absorption behavior of silver phosphate in visible regions, and the preparation method for the graphite-like alkene molybdenum disulfide / silver phosphate composite material is simple and practicable, the cost is low, the synthesis condition is wild, and large-scale popularization is facilitated; the prepared composite material has strong light absorption behavior in the visible regions.

The invention relates to an efficient and stable visible light polyaniline group nanometer silver phosphate compound photocatalyst and a preparation method thereof. The compound photocatalyst is formed by compounding polyaniline and silver phosphate. The preparation steps include: (1) preparing hydrochloric acid mixed chain polyaniline; (2) ultrasonic dispersing the polyaniline in a polar organic solvent; (3) dissolving silver nitrate, surfactant and ethanol in a system obtained in the (2), and stirring; (4) dropping a phosphoric acid solution into the system obtained in the (3) and keeping stirring; and (5) filtering the system obtained in the (4), washing with alcohol, washing with water, and drying to obtain the polyaniline group nanometer silver phosphate compound photocatalyst. Grain size of Ag3PO4 in the obtained compound photocatalyst is only 5-50 nm, the chain polyaniline is used as a carrier of the Ag3PO4 grains, nanometer grains are prevented from reuniting effectively, and catalytic performance is greatly improved. Due to the effect of a polyaniline electron acceptor, light corrosivity of Ag3PO4 can be reduced, and stability of catalyst is greatly improved.

The invention discloses a silver chloride-silver phosphate composite photocatalyst and a preparation method thereof. In the composite photocatalyst, the mole percent ratio of silver chloride and silver phosphate, i.e. silver chloride: silver phosphate, ranges from 1:0-0.3. The preparation method comprises the steps of: preparing a mixed solution of chloride ions and phosphate ions first, and then adding Ag+ ions to the mixed solution, thus obtaining the silver chloride-silver phosphate composite photocatalyst. Application of the silver chloride-silver phosphate composite photocatalyst provided in the invention to photocatalytic degradation of the organic pollutant methylene blue can greatly improve the reaction activity of a silver chloride photocatalyst. In addition, the preparation method of the silver chloride-silver phosphate composite photocatalyst in the invention is simple and practicable, thus benefiting large-scale popularization.

The invention discloses a silver phosphate-bismuth vanadate multiplex photocatalyst and a preparation method thereof. According to the silver phosphate-bismuth vanadate multiplex photocatalyst, silver phosphate nanoparticles are selectively deposited on the {010} crystal face of bismuth vanadate, the particle size of bismuth vanadate nanoparticles is 500nm-3mu m, the particle size of silver phosphate nanoparticles is 10-100nm, and the molar ratio of silver phosphate to bismuth vanadate is (1:5)-(1:20). The preparation method comprises the following steps of: firstly, dispersing a bismuth vanadate photocatalyst into deionized water; adding a water-solubility silver-bearing raw material and stirring till the water-solubility silver-bearing raw material is completely dissolved; adding a precursor containing phosphate radical and regulating the pH value; and finally, stirring the solution for 5-10hours, centrifuging, then washing and drying to obtain the final product. The silver phosphate-bismuth vanadate multiplex photocatalyst has excellent visible-light response performance and outstanding photocatalytic degradation performance and is capable of quickly degrading methylene blue dye solution within a very short time; and moreover, the preparation method of the silver phosphate-bismuth vanadate multiplex photo-catalyst is simple and easy, low in cost and good in repeatability.

The invention belongs to the technical field of photocatalytic materials and discloses a graphene oxide / silver phosphate composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) ultrasonically dispersing graphene oxide into water, so as to obtain graphene oxide dispersion liquid; (2) dropwise adding a silver nitrate water solution into the graphene oxide dispersion liquid obtained in the step (1), and stirring at a light-shading state, so as to obtain mixed dispersion liquid; (3) dropwise adding a disodium hydrogen phosphate water solution into the mixed dispersion liquid, stirring at a light-shading state to react, carrying out centrifugation, washing, and drying, so as to obtain the graphene oxide / silver phosphate composite photocatalyst. The photocatalyst has high photocatalytic activity and good stability; the preparation method is simple and suitable for batch production; and the photocatalyst can be applied to catalytic degradation of organic pollutants such as rhodamine B under the irradiation of visible light.