60results about How to "Reduce photocorrosion" patented technology

The invention discloses a preparation method of a p-CuO/n-CdS/ZnS composite semiconductor photochemical catalyst, which comprises the steps of: firstly, with an ammonium salt, a zinc salt, a cadmium salt, thiocarbamide and deionized water as raw materials, sequentially carrying out treatments such as microwave reaction, ultrasonic dispersion, heating reaction, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and the like to obtain CdS/ZnS solid powder; and secondly, with the CdS/ZnS solid powder, a copper salt, alkali and deionized water as raw materials, sequentially carrying out treatments such as reaction, ultrasonic dispersion, decompression distillation, thermal treatment, washing, ultrasonic dispersion, filtering, drying, roasting, grinding and the like to obtain the p-CuO/n-CdS/ZnS composite semiconductor photochemical catalyst. Through compounding a p-type semiconductor CuO with n-type semiconductor CdS and ZnS, oxidization of holes to the CdS can be effectively reduced, the light corrosion rate of the CdS is decreased; and photoproduced electronics are effectively separated from the holes, thus the service life of the CdS is prolonged, and the photochemical catalysis efficiency of the p-CuO/n-CdS/ZnS composite semiconductor photochemical catalyst is increased. The method is simple, convenient and practical, and is beneficial to popularization.

The invention discloses a preparation method for a copper/cuprous oxide/cyclized polyacrylonitrile visible-light-driven photocatalyst, and belongs to the technical field of environmental cleaning photocatalyst new materials. The preparation method includes the steps of firstly, preparing a nanometer copper hydroxide/photocatalyst compound by synchronously conducting solvent conversion and in-situ ion exchange reaction with photocatalyst, cupric nitrate and sodium hydroxide as raw materials; secondly, reducing copper hydroxide into cuprous oxide in situ through ascorbic acid; thirdly, conducting thermal treatment under the nitrogen atmosphere, reducing a small amount of cuprous oxide into elementary substance copper while cyclization and dehydrogenation are conducted on polyacrylonitrile to form a conjugated structure, and obtaining the copper/cuprous oxide/cyclized polyacrylonitrile visible-light-driven photocatalyst. The raw materials are wide in source, cost is low, the preparation method is simple and suitable for large-scale production, cyclized polyacrylonitrile can improve the separation efficiency of photoproduction electron holes and absorption of the visible light areas and can have a protection and optical corrosion reduction effect on copper/cuprous oxide, and the obtained catalyst is remarkable in adsorption and photocatalytic effect.

The invention discloses a composite photocatalyst for promoting water photolysis for producing hydrogen. The CdS/NiTiO3 composite photocatalyst is prepared through condensation-reflux introduction of a perovskite material NiTiO3 to CdS, wherein the NiTiO3 is synthesized through a sol-gel technology and is used as a cocatalyst. The composite catalyst promotes transfer of photon-generated carriers through a heterostructure formed by CdS and NiTiO3 and reduces the compounding probability of photon-generated electrons and holes, so the efficiency of water photolysis for producing hydrogen is substantially improved, and the disadvantage of photocorrosion of traditional photocatalysts is alleviated. The composite photocatalyst has the advantages of simple and easy preparation method, mild reaction conditions, and wide application prospect in the fields of development of energy alternatives of fossil fuels and high-efficiency utilization of the solar energy.

The invention relates to a preparation method for a two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst, which comprises the following steps: 1, adding zinc acetate dehydrate, 2-2'dipyridyl and urea at the molar ratio of 1:1:5 into a mixed solution of ethanol and distilled water, performing magnetic stirring until sound dissolution, and continuously stirring for 1 hour to obtain a mixed solution with the zinc acetate concentration of 10<-3>-10<-2>M; 2, transferring the mixed solution into an inner lining of a high-pressure reaction kettle which is heated for 12 hours at the temperature of 120-180 DEG C, and obtaining white flocky precipitate; 3, allowing the white flocky precipitate to be subjected to centrifugation after being cleaned by ethanol and distilled water in sequence, and drying for 8 hours at the temperature of 60 DEG C to obtain an alkali type zinc carbonate ultrathin layer precursor; and 4, roasting the precursor obtained in the step 3 for 2 hours at the temperature of 300-500 DEG C, so as to obtain the two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst. The two-dimensional ultrathin mesh-shaped ZnO nano photocatalyst prepared by the method is higher in activity.

The invention discloses a cuprous oxide-based photocathode with an enhanced nitrogen-doped back surface electric field, wherein the structure of the photocathode comprises conductive glass, a nitrogen-doped cuprous oxide layer, a P-type cuprous oxide light absorption layer, an N-type layer, a titanium dioxide protection layer and a cocatalyst layer from bottom to top. According to the invention, the performance of the cuprous oxide-based photocathode is greatly enhanced, so that the photocurrent of the planar cuprous oxide-based photocathode under a bias voltage of 0 V vs.RHE reaches about 10mA cm<-2> and is close to a theoretical value of 14 mA cm<-2>; and the introduction of the nitrogen-doped cuprous oxide layer can replace a traditional precious metal back electrode (gold electrode) so as to substantially reduce the preparation cost of the device, so that the cuprous oxide-based photocathode has a good development prospect, and the commercial application of the cuprous oxide-basedphotocathode is expected to be promoted.

The invention discloses a method of preparing self-supporting photo-anode based on cadmium sulfide/ nickel sulfide/ nickelic sulfide ternary composites and is applied to photoelectrochemical decomposition of oxygen-making catalyst in water. The invention synthetizes the composite of cadmium sulfide/ nickel sulfide/ nickelic sulfide mainly by means of one-step hydrothermal method, can be used directly as a photo-anode after ethanol cleaning and nitrogen drying. The invention is mainly applied to photoelectrochemical water decomposition. A linear sweep voltammetry (polarization curve) is adopted to test the degree of catalytic activity of the composite of cadmium sulfide/ nickel sulfide/ nickelic sulfide. A current and voltage curve is used to test the stability of the composite of cadmium sulfide/ nickel sulfide/ nickelic sulfide in the light. According to the invention, the synergistic effect of a cadmium sulfide, two sulfides of nickel in cadmium sulfide / nickel sulfide / nickel trioxide is fully utilized and the stability of cadmium sulfide in photoelectrochemical decomposition water is improved, and the invention facilitates the continuous decomposition of water by the catalyst after a long period of time.

The invention relates to the field of interior wall coatings, and particularly discloses an antiviral coating and a preparation method thereof. The antiviral coating is prepared from the following components in parts by weight: 6 to 10 parts of polyurethane emulsion, 1 to 3 parts of water, 1.5 to 2.5 parts of pigment filler, 0.5 to 1 part of antibacterial agent, 1 to 3 parts of auxiliary agent, 1.2 to 2 parts of antiviral porous microspheres and 0.1 to 0.5 part of polyphosphate; the antiviral porous microspheres are prepared from the following components in parts by weight: 0.5 to 1 part of activated carbon, 0.8 to 1.2 parts of a traditional Chinese medicine extracting solution, 1 to 1.5 parts of polylactic acid, 0.5 to 0.8 part of silicon dioxide sol, 0.3 to 0.7 part of carbon nanotubes and 0.2 to 0.5 part of zinc pyrithione. The antiviral coating disclosed by the invention has the advantages of being capable of resisting viruses and degrading formaldehyde under a weak light or dark condition, strong in stain resistance and good in antibacterial property and light stability.

The preparation method comprises the following steps: firstly, preparing a Zn < 0.21 > Cd < 0.79 > S/D-ZnS (en) < 0.5 > heterojunction material by utilizing a solvothermal method; furthermore, two-step photochemical synthesis modification is performed on the material, and a phosphorus oxide (Pi) protective layer and different types of cocatalysts (MPi and MS) are synthesized and loaded on the surface of the material. Due to the capture effect of H2PO < 2-> on photogenerated holes, the Zn0. 21 Cd0. 79 S/D-ZnS (en) 0.5 heterojunction material is synchronously subjected to photocatalytic hydrogen production reaction in the two steps of photochemical synthesis modification. The photochemical synthesis and ion exchange co-modification method provided by the invention can be used for constructing more Zn1-xCdxS catalytic systems, and an efficient and stable process of producing hydrogen by photocatalytic decomposition of pure water is realized. The series of processes are combined, continuous application of the process of partially decomposing water through photocatalysis and the process of decomposing pure water into hydrogen through photocatalysis is achieved for the first time, and high innovativeness and practicability are achieved.

The invention relates to the use of iron oxide particles coated with titanium dioxide, and in particular to their use for decomposing air pollutants photocatalytically. The invention is further directed to the use of iron oxide particles being at least partially coated with titanium dioxide, for photocatalytically decomposing air pollutants selected from nitrogen oxides (NO_x) and volatile organic compounds (VOC), that come into contact with said particles.

The invention discloses a preparation method for anchoring copper clusters on the surface of cadmium sulfide, and belongs to the technical field of semiconductor photocatalytic material preparation. The preparation method comprises the following steps: preparing a cadmium sulfide nanorod through a hydrothermal synthesis method, carrying out protonation treatment on the cadmium sulfide nanorod to reduce cadmium-sulfur bonding stability, forming defects on the surface of cadmium sulfide through a one-step calcination method, anchoring a solid precursor copper salt in the defects, and finally forming the cadmium sulfide-copper cluster catalyst without ligand wrapping. According to the method, the copper clusters are directly anchored on the surface of the carrier cadmium sulfide through a method for constructing cadmium defects on the surfaces of the cadmium sulfide nanorods to serve as capture sites, and the surfaces of the copper clusters anchored on the cadmium sulfide do not need to be wrapped by any ligand; through construction of direct contact between cadmium sulfide and atoms of a copper atom cluster interface, carrier transmission of a system is promoted, high surface free energy of the copper atom cluster is reduced, and high activity and high stability of the cadmium sulfide-copper atom cluster are realized.

The invention discloses a cadmium sulfide-sulfur indium zinc heterojunction nanorod array composite material and a preparation method thereof, and belongs to the technical field of inorganic photoelectric materials. The method comprises the following steps: firstly, hydrothermally growing a cadmium sulfide nanorod array on pretreated FTO conductive glass, and then epitaxially growing a sulfur indium zinc nanosheet on the surface of cadmium sulfide by a solvothermal method to form the cadmium sulfide-sulfur indium zinc heterojunction nanorod array composite material. By controlling an indium source precursor and a zinc source precursor, sulfur indium zinc with different morphologies grows on the surface of the cadmium sulfide nanorod. The method disclosed by the invention is simple and easy to implement and good in repeatability, and the grown cadmium sulfide nanorod array is tidy and uniform in arrangement. Due to the formation of the cadmium sulfide-indium zinc sulfide heterojunction, active sites are increased, the separation of photon-generated carriers is accelerated, the photoelectric property and the stability of the cadmium sulfide nano array material are further improved, and the cadmium sulfide nano array material can be applied to the field of photoelectrocatalysis.

The invention discloses a method for preparing a ZnO/TiO2 heterojunction thin-film material through spin-coating. The preparation method comprises the following steps: controlling the spin-coating rotation speed and the spin-coating frequency of a spin-coating zinc acetate-ethanol solution to control the uniform distribution degree and density of ZnO seed crystals, and growing ZnO nanowires on theZnO seed crystals under hydrothermal conditions to prepare the ZnO/TiO2 heterogeneous material with a nest-shaped structure. The ZnO/TiO2 film obtained in the invention has the advantages of large specific surface area, high optical absorption performance, high photoelectric efficiency and high charge transfer efficiency, and can be widely used in the fields of photoelectrocatalysis for hydrogenproduction, photoelectrocatalytic degradation of organic matters and the like.

The invention discloses a bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following steps of: growing needle-like silver phosphate on the surface of bismuth vanadate by adopting an in-situ precipitation method to obtain bismuth vanadate@silver phosphate with a heterojunction structure; and coating the bismuth vanadate@silver phosphate with a heterojunction structure by using graphene oxide to obtain the bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst. In the prepared bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst, needle-like silver phosphate grows on the surface of bismuth vanadate in situ to form a heterojunction structure, and the surface of the bismuth vanadate is coated with graphene oxide nanosheets. The bismuth vanadate@silver phosphate/graphene oxide composite photocatalyst can be applied to treatment of water containing organic pollutants, the organic pollutants are subjected to photocatalytic degradation under visible light irradiation, and good stability and excellent photocatalytic activity are kept.

The invention provides a preparation method of a CuFeO2 semiconductor. According to the technical scheme, iron ions are doped in traditional Cu2O, the pH value of a CuFeO2 electrodeposition solution is adjusted, and CuFeO2 is deposited on ITO conductive glass to prepare the CuFeO2 semiconductor. The prepared CuFeO2 semiconductor is regular in shape, uniform in size and uniform and flat in thickness. Compared with a Cu2O semiconductor, the Faradaic efficiency of CuFeO2 semiconductor hydrogen evolution is greatly improved, the light corrosion of the semiconductor is greatly reduced, and the obtained CuFeO2 semiconductor has more excellent photostability compared with that of the Cu2O semiconductor.

The invention discloses a polyaniline/copper sulfide composite photocatalyst with dye adsorption-catalytic degradation functions and a preparation method and application thereof, and belongs to the technical field of catalytic degradation. The preparation method of the composite photocatalyst comprises the following steps: uniformly mixing aniline and a hydrochloric acid solution through ultrasonic waves, dropwise adding an ammonium persulfate solution while stirring to generate polyaniline, and then loading a nano photocatalyst copper sulfide on the generated polyaniline by using an in-situ precipitation method. According to the polyaniline/copper sulfide composite photocatalyst obtained by the method, the molar ratio of aniline to copper sulfide is (0.5-2):1, the molar ratio of aniline to ammonium persulfate is 0.9:1, and the molar ratio of aniline to hydrochloric acid is 0.72:1. The nano photocatalyst copper sulfide is loaded on polyaniline in an in-situ precipitation manner, the method is simple and convenient to operate, and the prepared polyaniline/copper sulfide composite photocatalyst has a remarkable effect when being applied to adsorption of anionic dye wastewater and light degradation removal of cationic dye wastewater.