66results about How to "Inhibit photocorrosion" patented technology

The invention discloses preparation for compound hollow sphere CdS-TiO* and application in photocatalytic hydrogen production by water decomposition. The preparation method uses inexpensive cadmium source and titanium source, adopts a hydrothermal method, a two-step impregnation method and a sol-gel method for preparing compound hollow sphere CdS-TiO* nanophase materials; and the technical process is simple and practicable and can realize scale production. CdS and TiO2 are compounded, which broadens the spectral response range of TiO2; the prepared compound hollow sphere CdS-TiO is used as photocatalyst for solar energy visible light catalyzing hydrogen production by water decomposition; compared with the TiO2 photocatalyst, the optical energy utilization ratio of the solar energy is substantially increased and the speed of hydrogen production is obviously increased.

The invention discloses a preparation method of a silver phosphate/graphene nanocomposite. The method has the advantages that a light-assisted reducing process is adopted, the process is simple, and the cost is low, so that the method is suitable for large-scale production and industrial production. The prepared silver phosphate/graphene nanocomposite consists of silver phosphate nanoparticles and graphene nanosheets, wherein the graphene nanosheets cover the surfaces of the spherical silver phosphate nanoparticles with sizes of about 200nm, and the two are in close interface contact. The silver phosphate/graphene nanocomposite disclosed by the invention is a novel visible-light-driven photocatalyst which is more efficient and stable.

The invention provides a preparation method of a composite photocatalyst CdS/n-TiO2 for catalyzing and decomposing H2S to prepare hydrogen and relates to a preparation method of a composite photocatalyst. The preparation method solves the problem of low hydrogen generation rate when H2S is optically catalyzed and decomposed by CdS/TiO2. The preparation method comprises the following steps: ultrasonically dispersing, drying, grinding and roasting nanometer TiO2 in a dispersing agent to obtain n-TiO2; adding the n-TiO2 in a cadmium salt solution and a vulcanizing agent solution to obtain yellow gelatinous precipitates; and obtaining the composite photocatalyst CdS/n-TiO2 by hydrothermally processing, cooling, washing and filtering the precipitates and drying filter residues. Compared with the CdS/TiO2 photocatalyst, the composite photocatalyst obtained by the preparation method increases the hydrogen generation rate by 28 percent to 52 percent under visible light.

The invention discloses a short-hole-channel ordered mesoporous silica-sulfur-indium-zinc composite photocatalyst as well as a preparation method and application thereof. The short-hole-channel ordered mesoporous silica-sulfur-indium-zinc composite photocatalyst is prepared through the following steps of mixing ethyl orthosilicate with ZrOCl2, zinc salt, indium salt and a reducing agent so as to obtain a mixture, in the presence of a surfactant, sequentially performing sol-gel treatment, hydrothermal treatment and alcohol ultrasonic treatment, performing sucking filtration, performing cleaning and performing drying. According to the photocatalyst, the integration of adsorption and photocatalytic oxidation is realized, the photocatalyst has high adsorption properties and high photocatalytic activity on volatile organic compounds (VOCs), and hydroxyl radicals produced on the surface of a catalyst can effectively degrade the VOCs adsorbed and enriched by materials in an in-situ manner, so that the reaction rate and the reaction efficiency of photocatalytic degradation on the VOCs can be substantially improved, the photocatalyst can be used as an adsorbent or the photocatalyst for organic contaminants in the field of environmental protection, and the photocatalyst has wide environmental protection application potential.

The invention discloses a composite visible-light-induced catalyst and a preparation method and application thereof. The composite visible-light-induced catalyst is prepared from CNT-silver citrate and g-C3N4-PO43- through a precipitation method, wherein the CNT-silver citrate is prepared from CNT, sodium citrate and AgNO3 through surface complexing action, and the g-C3N4-PO43- is prepared from g-C3N4 and NaH2PO4 through surface phosphorylation. The preparation method includes the steps of preparation of the CNT-silver citrate, preparation of the g-C3N4-PO43- and preparation of CNT/Ag3PO4/g-C3N4. The composite visible-light-induced catalyst can be applied to treatment of antibiotic wastewater and has the advantages of high visible light utilization rate, stable presence in water and stable photocatalytic performance.

Disclosed is a preparation method of an Ag@SiO2-core-shell-structure-modified g-C3N4 photocatalysis fiber. The preparation method comprises: (1) dispersing g-C3N4 in an APAM aqueous solution through ultrasonic wave to obtain a dispersion liquid containing g-C3N4 nanoplates; (2) dissolving PVP in glycol, adding AgNO3, adding excess acetone for precipitation of Ag particles, and performing separation to obtain Ag nanoparticles; (3) dispersing the Ag nanoparticles in absolute ethanol, adding deionized water, ammonia water, and a tetraethoxysilane-containing ethanol solution, and performing centrifugation to obtain SiO2-coated Ag nanoparticles; (4) dropwise adding the SiO2-coated Ag nanoparticles and an APAM aqueous solution into the dispersion liquid containing g-C3N4 nanoplates, and performing concentration to obtain a spinning solution; and (5) spinning the spinning solution to obtain a precursor fiber, and allowing the precursor fiber to be subjected to thermal treatment to obtain the Ag@SiO2-modified g-C3N4 fiber photocatalysis material. Through the preparation method, time for layer exfoliation of g-C3N4 is greatly shortened. The obtained photocatalysis fiber material with a water treatment function can be easily recycled and utilized.

The invention discloses a ternary composite visible-light-induced photocatalyst and a synthesis method thereof. The synthesis method comprises the following steps: firstly, preparing g-C3N4 by adopting a melamine calcining method; then mixing the g-C3N4 with an N,N-dimethylformamide solution of polyaniline, and carrying out ultrasonic treatment, stirring and solvent evaporation to prepare a polyaniline/g-C3N4 binary compound; and mixing the polyaniline/g-C3N4 binary compound, single-layer graphene oxide and ascorbic acid in deionized water, and carrying out hydrothermal treatment on the mixture to obtain the graphene/g-C3N4/polyaniline ternary compound. The method is simple and easy to implement, the raw materials are rich and easy to obtain, metal and metal compounds are not used, the cost is low, and the obtained graphene/g-C3N4/polyaniline ternary compound not only has high visible light catalytic activity on reduction of hexavalent chromium in a decorative chromium plating solution, but also has good photocatalytic stability and reusability, and can be used as a novel visible-light-induced photocatalyst to be applied to efficient and stable treatment of hexavalent chromium wastewater.

The invention discloses an antibacterial plastic master batch, a preparation method thereof and antibacterial plastic. The antibacterial plastic master batch comprises the following raw material components in parts by weight: 15-40 parts of nano zinc oxide, 1-15 parts of nano silver powder, 1-15 parts of nano copper powder, 0.5-5 parts of graphene, 5-25 parts of a long afterglow luminescent material, 1-6 parts of a dispersing agent, 0.1-5 parts of a coupling agent and 30-70 parts of carrier resin. The antibacterial component in the antibacterial plastic master batch takes the nano zinc oxide as a substrate, and the nano silver powder, the nano copper powder, the graphene and the long afterglow luminescent material are added in an auxiliary manner, so that the antibacterial plastic master batch can play an antibacterial role in a relatively wide wavelength range, and also can play an antibacterial role in the absence of illumination.

The invention belongs to the technical field of photocatalysis, and particularly relates to a spherical bismuth vanadate/black phosphorus composite photocatalytic material and a preparation method andapplication thereof. The preparation method comprises the following steps: preparing bismuth vanadate by adopting a coprecipitation method, dissolving bismuth vanadate in ethanol, mixing with a blackphosphorus suspension obtained by liquid-phase ultrasonic treatment, performing ultrasonic dissolving, performing uniform mixing, transferring the mixture into a water bath kettle, and finally performing centrifuging, washing and drying to obtain the spherical bismuth vanadate/black phosphorus composite material. By adjusting the addition amounts of different black phosphorus, the degradation efficiency of the organic pollutant rhodamine B (20mg/L) under the same condition (the illumination time is 90min and the catalyst dosage is 50mg) under simulated visible light irradiation is respectively inspected. Photocatalytic results show that the bismuth vanadate/black phosphorus composite photocatalyst prepared by compounding 0.01 g of black phosphorus and bismuth vanadate has the most excellent photocatalytic performance.

The invention relates to a visible light photocatalyst, a modified PVDF ultrafiltration membrane and a preparation method and application thereof. In a Bi2MoO6/CuS visible light photocatalyst, the mass ratio of Bi2MoO6 to CuS is (20-100): 1, and CuS is dispersed on the surface of Bi2MoO6 to form hollow flower-shaped spheres; in the ultrafiltration membrane, PVDF is used as a matrix, and a Bi2MoO6/CuS nano photocatalyst is used as an active component; the ultrafiltration membrane is prepared from the following components in parts by weight: 17 to 19 parts of polyvinylidene fluoride, 2.5 to 3.5parts of polyvinylpyrrolidone, 77 to 79 parts of N, N-dimethylacetamide and 0.5 to 1.5 parts of Bi2MoO6/CuS nano photocatalyst. Compared with the prior art, the modified membrane provided by the invention is uniform in membrane pore distribution and good in photocatalytic activity, can generate hydroxyl radicals and oxygen anions with an oxidation effect on the surface of the membrane under the irradiation of visible light, and can kill attached bacteria and degrade attached organic pollutants, so that the formation of a biological membrane on the surface of the membrane can be remarkably inhibited, and a good membrane pollution control effect is achieved.

The invention provides an rGO/silver silicate composite and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. By the combination of rGO andAg10Si4O13, a composite photocatalyst with smaller particle size (about 25 nm) and more uniform grain distribution is successfully prepared. At the same time, because of the excellent conductivity ofrGO, rGO can rapidly transfer photo-generated carriers produced by Ag10Si4O13 to the surface after being combined with Ag10Si4O13; the combination problem of the photo-generated carriers can be overcome, the photocatalytic efficiency is improved, the photo-corrosion problem caused by the enrichment of photo-generated electrons on the surface of Ag10Si4O13 can be avoided, and the stability of the Ag10Si4O13 material is improved. The material can be well applied to photocatalytic degradation of pollutants.

The invention relates to a composite electrode material, as well as a preparation method and application thereof, and belongs to the technical field of energy conversion and storage materials. The composite electrode material provided by the invention is a ZnO/CdS/BiOI nanorod array with a three-dimensional (3D) crosslinking heterostructure, and the ZnO/CdS/BiOI nanorod array with the 3D crosslinking heterostructure is formed by perpendicularly and uniformly arranged one-dimensional ZnO/CdS nanorod array and BiOI nanosheets; and the ZnO/CdS nanorod array is formed by uniformly dispersing CdS on the surface of a ZnO nanorod array. According to the composite electrode material provided by the invention, under visible light irradiation (lambda is larger than 420nm), an NRAs photoanode of ZnO/CdS/BiOI shows excellent PEC activity, 9.12 mA*cm<-2> of photocurrent density is produced under 1.1V vs. RHE, and 3.49 percent of high light conversion efficiency and long-term stability over 6000 seconds are realized; and the composite electrode material provided by the invention is low in raw material cost, the preparation method is simple and effective, the synthesis process is green and controllable, the mass production of the material is facilitated, and the composite electrode material has a considerable practical application prospect.

The invention relates to a polyvinylidene fluoride mixed matrix membrane with photocatalytic self-cleaning performance as well as a preparation method and application of the polyvinylidene fluoride mixed matrix membrane. The preparation method comprises the steps of mixing a SnO2-Cu2O nano composite material with polyvinylidene fluoride to prepare a membrane casting solution, and then preparing the polyvinylidene fluoride mixed matrix membrane by a non-solvent induced phase separation method. The mixed matrix membrane can be used for improving the organic pollutant resistance of a catalytic membrane reactor device. Compared with the prior art, SnO2-Cu2O is added into the polyvinylidene fluoride membrane casting solution in the form of an additive, and the PVDF membrane is modified by introducing an inorganic nanoparticle blending method and an NIPS method, so that the mechanical strength of the composite membrane is improved, the hydrophilicity is greatly enhanced, and the composite membrane has better anti-pollution capability and interception performance.

The invention relates to a coating preparation technology, in particular to a photocatalytic antibacterial and antiviral formaldehyde-removing and odor-removing coating which comprises sodium hexametaphosphate, nano titanium dioxide, a dispersing agent, hydroxyapatite, a silane coupling agent, potash water glass, water and condensed phosphate. The materials are prepared to prepare the photocatalytic antibacterial and antiviral formaldehyde-removing and odor-removing coating, the prepared coating can effectively remove formaldehyde and TVOC in the coating, and the removal rate is 90% or above, so that the coating has a good space purifying function, the bonding and durability of the coating can be kept, and the photocorrosion effect is avoided; therefore, the coating can be applied to wall surfaces of various occasions such as indoors and outdoors.

The invention belongs to the technical field of degrading organic pollutants in wastewater by multiphase photocatalytic oxidation technology, and particularly relates to a nano titanium dioxide photocatalyst capable of degrading phenolic pollutants in the wastewater, and a preparation method of the nano titanium dioxide photocatalyst comprises preparation of a composite material containing graphite oxide powder, processing of nano titanium dioxide particles and synthesis of the nano titanium dioxide photocatalyst. Compared with the prior art, the nano titanium dioxide photocatalyst has the following advantages: doping levels can be formed by effective compounding, effective charge separation is increased, the energy band width of the titanium dioxide is reduced, light transmittance is increased, light utilization rate of the catalyst is increased, photo-corrosion phenomenons can be avoided, the pollutants can be quickly adsorbed, due to a larger specific surface area and a high-void structure of the nano titanium dioxide photocatalyst, more pollutant molecules can be adsorbed, and degradation effect of the phenolic pollutants in the wastewater can be improved.

The invention discloses a preparation method and application of a visible light catalysis antibacterial material cuprous oxide/ZIF-8 heterojunction, ZIF-8 is taken as a substrate, Cu2O is loaded on the surface of the ZIF-8 in situ by adding copper salt, a surfactant, sodium hydroxide, a reducing agent and the like, and the Cu2O/ZIF-8 heterojunction photocatalysis antibacterial material with the Cu2O coating the ZIF-8 is constructed. The construction of the Cu2O/ZIF-8 heterojunction stabilizes the structures of ZIF-8 and Cu2O on one hand, and promotes the generation of ROS (reactive oxygen species) through heterojunction interface electron migration under the excitation of indoor visible light on the other hand, so that microorganisms such as bacteria and the like die quickly. An antibacterial test shows that the sterilizing rate of the low-concentration Cu2O/ZIF-8 heterojunction (5 [mu] g mL <-1 >) on escherichia coli can reach 99% or above in 15 min under a fluorescent lamp (fluorescent lamp, 13W) with weak light intensity.