217results about How to "Improve photocatalytic ability" patented technology

The invention relates to a titanium dioxide / graphene nanocomposite material, a preparation method of the nanocomposite material and application of the nanocomposite material in the field of energy source and cleaning environment. The graphene accounts for 1-25wt% and the balance is titanium dioxide. Morphology of the titanium dioxide is a mesoporous structure or a structure with a dominant high energy surface, and titanium dioxide is scattered uniformly on the surface of graphene. According to the invention, by adopting a titanium source and graphene as initial materials, and water or organic solvents as reaction solvents, the nanocomposite material with titanium dioxide with the mesoporous structure or a titanium dioxide nano sheet with the dominant high energy surface compounded with graphene can be obtained through hydrothermal synthesis or a hydrolysis reaction. The invention can be carried out in an aqueous solution system and the crystallinity of the product is high. The composite material can be applied to a cathode material of a power ion battery, has a higher charge-discharge capacity, is excellent in high current charge and discharge, stable in circulating performance, has very good photocatalytic performance and can be used to light degradation of organic pollutants and water photolysis for preparing hydrogen.

The invention discloses a method for regulating river branch black and odorous water bodies by using a graphene modified nano titanium dioxide photocatalyst fiber net. The method comprises the following steps: (1) preparing a reduction-oxidation graphene modified nano titanium dioxide hetero-structure composite photocatalyst; (2) preparing a water-resistant and impact-resistant aluminum-based crosslinking agent to form a homogeneous mixture with the catalyst, adding the homogeneous mixture into fiber stuff for producing a high-density polyethylene fiber net, or also preparing a high-density polyethylene fiber net provided with a nano photocatalysis film coating; (3) performing natural drying in the air, and then performing drying at a constant temperature in a drying room; and (4) arranging the graphene modified nano titanium dioxide photocatalyst high-density polyethylene fiber net on a river branch to contact with the water surface and receive illumination at the same time so as to control the river branch black and odorous water bodies. The method disclosed by the invention does not need aeration oxygenation, is energy-saving and environment-friendly, and is lower in cost and simpler in process.

Provided are a compound type photocatalyst air purification waterborne interior wall coating and a preparation method thereof. The compound type photocatalyst air purification waterborne interior wall coating comprises, by weight, the following materials of 5.5-22.3% of photocatalysis packing, 25-65% of polyurethane emulsion, 1-6% of propylene glycol phenylate, 2-6% of dispersing agents, 2-4% of stabilizing agents, 1-2% of wetting agents, 20-60% of water, 1.5-4% of mildewproof agents, 1-2% of antifoaming agents, 0.5-2% of flatting agents, and 0.5-1% of thickening agents. The photocatalysis packing is formed by complexation of nanoanatase type titanium dioxide and nano-zinc oxide or nano stannic oxide according to a weight ratio of 5-9:1-5. The coating has good air purifying capacity, and can effectively degrade harmful gases in the air and kill bacterial viruses under excitation of ultraviolet light. As an interior decorative material, the coating has good covering power and adhesive power and excellent stability. The coating and the production method are simple in production process, suitable for various coating methods, and easy to popularize and apply.

The invention discloses modified TiO2 loaded photocatalytic ceramsite and a preparation method thereof and belongs to the field of nano photocatalytic materials. The preparation method comprises the following steps: firstly, preparing porous ceramsite by using raw materials including industrial sludge, clay, sawdust and calcium hydroxide; and secondly, covering one layer of nano-grade modified TiO2 on the surface of the porous ceramsite through an immersion method to finally prepare the modified TiO2 loaded photocatalytic ceramsite. According to the modified TiO2 loaded photocatalytic ceramsite and the preparation method thereof, the raw materials are cheap and the process is simple; the prepared ceramsite material is uniform in grain diameter, adjustable in size, large in specific surface area and high in photocatalytic activity, and has a very high catalytic degradation capability in an ultraviolet-visible light region. The photocatalytic ceramsite material can be used for photocatalytic treatment of organic wastewater and can also be used for oxidative degradation of gas-phase organic matters.

The invention provides a cellulose / silver chloride composite material and a preparation method thereof. The cellulose / silver chloride composite material is quickly prepared by adopting microcrystalline cellulose, sliver salt and chlorine compound as the materials, adopting water as solvent and adopting an ultrasonic-wave treatment method. The cellulose / silver chloride composite material prepared by the preparation method disclosed by the invention is uniform in silver / silver chloride nanometer particle, capable of being uniformly distributed on a cellulose substrate and is extensive in application prospect in the antibacterial filed and the photocatalysis filed. Moreover, according to the preparation method disclosed by the invention, the materials are cheap, the process is simple, the operation is convenient, the preparation is quick and the process conditions are easy to control, so that the production process is greatly simplified, the time is saved and the cost is reduced. Meanwhile, the preparation method is free of any expensive and complex equipment and is beneficial to the industrial popularization.

A process for preparing the titanium oxide-based photocatalyst used to degradate the polltents in water and air features that two kinds of metallic ions are doped in the procedure of preparing TiO2 powder or film.

The invention discloses a GO (graphene oxide) and g-C3N4 composite modified membrane material. A preparation method includes steps: activating an original membrane to recover original membrane flux; adding a surfactant into GO and g-C3N4 mixed dispersion liquid to obtain mixed liquid; soaking the activated original membrane into the mixed liquid to realize ultrafiltration adsorption, and soaking the membrane into aniline hydrochloric acid solution; taking out after soaking is finished, and soaking in hydrochloric acid solution of ammonium persulfate immediately to enable interface polymerization reaction; finally, drying the membrane to obtain the composite modified membrane material. By an ultrafiltration adsorption and interface polymerization combined modification method, GO and g-C3N4are combined for surface composite modification of the membrane material, and a visible light responsive catalytic modified membrane is developed. The novel modified membrane is low in preparation cost and recyclable, pollution resistance is remarkably improved, firmness in modifying agent and photocatalyst loading is achieved, the visible catalytic performance and hydrophilic performance are remarkably enhanced, the forbidden bandwidth of a membrane function layer is decreased, the problem of secondary pollution is avoided, and a promising application prospect is achieved.

The invention provides a preparation method of bismuth tungstate nanocomposite. The method is as follows: (1) dissolving Na2WO6.2H2O and sodium oleate in redistilled water, and conducting ultrasound treatment to form a clear liquid; mixing the Bi(NO3)3.5H2O, 1mg / mL graphene oxide and redistilled water, and conducting ultrasound treatment to form a brown uniform liquid; mixing and stirring evenly the two solutions, conducting a hydrothermal reaction, cooling, filtering to obtain a precipitate, washing and drying the precipitate to obtain black rGO / Bi2WO6 nanocomposite; and (2) dispersing the rGO / Bi2WO6 nanocomposite into absolute ethyl alcohol, dissolving silver nitrate in ethylene glycol, mixing the two, and irradiating under xenon lamp to obtain a silver loaded rGO / Bi2WO6 / Ag nanocomposite. The bismuth tungstate nanocomposite provided by the invention has good photosensitization, and has great significance in photocatalytic degradation of organic pollutants.

The invention discloses a surface treatment method for a flatting agent for a chinlon chemical fiber. The method comprises the following steps of: performing ultrafine smashing treatment on a TiO2 raw material to obtain ultrafine TiO2 powder of which the particle diameter is distributed in the range of 100-400 nanometers; precipitating an inorganic film by adopting a precipitation method to precipitate a layer of amorphous TiO2 on the surface of the TiO2; and modifying the surface of the TiO2 by adopting a coupling agent method to enable amorphous TiO2 which is rich in hydroxyl and has a large specific surface area and a titanic acid ester coupling agent to form more chemical bonds. The finally obtained TiO2 digestant has the characteristics of small particle diameter, high flatting property, high color fastness to light, and high weather resistance color fastness, and high dispersivity, high compatibility and high stability in fibers.

The invention discloses a device and a method for treating hard-to-degrade organic waste water by combined treatment of the Ag3PO4 / TiO2 catalyst and low-temperature plasma. The device for treating hard-to-degrade organic waste water comprises a round flat-type dielectric barrier discharge reaction device and a circular buffering container. The round flat-type dielectric barrier discharge reaction device comprises a high-voltage electrode and a grounding electrode which are connected with a positive electrode and a negative electrode of an alternating current high voltage power supply respectively and are arranged to be opposite to each other up and down. A quartz medium plate and a round reaction vessel are arranged between the high voltage electrode and the grounding electrode. The water inlet and the water outlet of the round reaction vessel are communicated with the circular buffering container through peristaltic pumps and a waste water circulation pipeline is formed. The Ag3PO4 / TiO2 catalysts are uniformly distributed at the bottom of the round reaction vessel. The provided device is simple and practicable, a lot of visible light and ultraviolet light generated by dielectric barrier discharge can be utilized fully, light loss is avoided, the dielectric barrier discharge degradation efficiency can be raised greatly, the device investment is low, and the universality is strong.

The invention relates to a preparation method of a three-dimensional graphene-titanium dioxide compound photocatalyst. A three-dimensional porous-structure graphene-titanium dioxide compound is prepared through a hydrothermal-method reaction of graphene oxide and titanium trichloride. The three-dimensional graphene-titanium dioxide compound provided by the invention has a very good photocatalytic property and can be used for rapidly degrading organic pollutants in wastewater, particularly organic pollutants including pesticides and the like, into pollution-free substances including H2O, CO2 and the like under the conditions of normal temperature, normal pressure and light illumination; and the compound can be repeatedly utilized for a plurality of times and has lasting photocatalytic activity. Furthermore, the three-dimensional graphene-titanium dioxide compound can also be used as a material of a super capacitor, a lithium-ion battery and a fuel cell, and has a wide application prospect.

The invention relates to the field of materials and discloses a nano-TiO2 / activated carbon fibrofelt three-dimensional porous material high in adsorption and photocatalytic performance, and a preparation method thereof. The material is of a three-dimensional porous structure and an activated carbon fibrofelt is adopted as a substrate. Meanwhile, nano-TiO2 is adhered inside the activated carbon fibrofelt. The nano-TiO2 is mainly composed of anatase and the partical size of the nano-TiO2 is 50 nm-1 mum. The preparation method comprises the following steps: (1) dipping the activated carbon fibrofelt into a zinc oxide crystal layer solution, and obtaining the activated carbon fibrofelt with a zinc oxide crystal layer deposited on the surface thereof through the dip-coating method; (2) dipping the activated carbon fibrofelt with the zinc oxide crystal layer deposited on the surface thereof into a TiO2 growth-promoting solution, and growing nano-TiO2 in situ on the surface of the zinc oxide crystal layer through the hydrothermal method. The method is simple, easy to operate, economical, applicable and environmentally-friendly. The prepared composite material is strong in adsorption performance, high in photocatalytic performance and excellent in filtering effect. Therefore, the material has a wide application prospect in the field of air purification.

The invention discloses a mesoporous Fe-based MOF@AgI high-efficiency composite visible light photocatalysis material, and a preparation method and an application thereof. The photocatalysis material is obtained through loading AgI particles on the surface and the internal of a mesoporous microsphere Fe-MIL-88B-NH2MOF material. Sulfonated polystyrene microspheres are synthesized through a dispersion polymerization technology, and are adopted as a template to synthesize the mesoporous microsphere Fe-MIL-88B-NH2MOF material, and the AgI parts are loaded on the mesoporous microsphere Fe-MIL-88B-NH2MOF material to obtain the target product. In the composite material, the mesoporous microsphere Fe-MIL-88B-NH2MOF material has large adsorption capacity, and the AgI particles have strong photocatalytic performance, so the binary photocatalysts synthesized through combining the advantages of above two materials has substantially enhanced organic dye visible light photocatalytic degradation activity under the synergistic action of composite promoted photogenerated charge separation, and has a wide application prospect in the field of photocatalytic environment purification.

The invention relates to TiO2 / sepiolite composite gel and a preparation method thereof. The composite gel is of a 3D net structure, wherein 001 and 101 crystal planes of TiO2 in the composite gel areexposed, and 5%-50% of the 001 crystal plane is exposed. The preparation method of the composite gel comprises the following steps: a Ti source is hydrolyzed; a sepiolite dispersion is prepared; an aqueous surfactant solution is prepared; the three obtained mixed solutions are mixed and subjected to a solvothermal reaction, and the TiO2 / sepiolite composite gel with the 001 and 101 crystal planes exposed is obtained. The TiO2 / sepiolite composite gel is novel in structure, has high adsorptive property and photocatalytic activity and has broad application prospect in the purification field, TiO2dispersion is promoted, and the problem that solid-liquid separation is difficult for pure TiO2 powder is solved.

The invention relates to a catalyst which is relevant to zinc and titanium and a chemical method for preparing the catalyst. The zinc titanate micro-nano photocatalysis material has a spheroid structure with a plurality of protrusions. The preparation method of the zinc titanate micro-nano photocatalysis material comprises the following steps of: mixing uniform concentrated ammonia water suspension A of TiO2; slowly adding a zinc salt solution or ZnO powder into the suspension A in the titanium / zinc molar ratio of 1:1 to obtain uniform suspension B; processing the suspension B at high temperature and high pressure and then centrifugally washing the suspension B with deionized water many times to obtain a precursor C; drying the precursor C, burning at high temperature, and finally ball-milling. The prepared material has high specific surface area which reaches 160.6m2 / g and has stronger visible light photocatalysis performance. The preparation method has low production cost and is suitable for scale industrial production.

The invention relates to a sulfonated coal loaded TiO2 photocatalyst and a preparation method thereof. A supported nanocrystal TiO2 photocatalyst taking semicoke sulfonated coal as a substrate is prepared through a microwave-liquid phase deposition method by taking high-polymer semi-organic matter sulfonated coal as a carrier and titanium sulfate as a titanium source, wherein the semicoke sulfonated coal as the carrier has the particle size of 0.15-0.3mm. The process comprises primary microwave radiation, centrifugal separation, multiple washing and suction filtration, secondary microwave radiation, ultrasonic wave washing and tertiary microwave radiation. The sulfonated coal loaded TiO2 photocatalyst prepared by the invention is better in adsorption property, high in photocatalytic performance, convenient to recycle, free of loss, incapable of weakening the photocatalytic performance, and suitable for wastewater treatment. The preparation method is simple in process, easy to operate, free of pollution and the like so as to be suitable for industrial production.

The invention discloses a hybrid material based on a macrocyclic compound photosensitive dye and titanium dioxide and a preparation method thereof, and application of the hybrid material to photocatalysis. The hybrid material comprises the macrocyclic compound photosensitive dye and titanium dioxide, wherein the macrocyclic compound photosensitive dye is a calixarene compound or porphyrin compound. The invention also discloses the preparation method for the hybrid material based on the macrocyclic compound photosensitive dye and titanium dioxide, and application of the hybrid material to photocatalysis. The organic-inorganic hybrid material prepared from the macrocyclic compound photosensitive dye and titanium dioxide has a hierarchical porous structure, and can improve the free diffusionof gas and surface adsorption of CO2, increase the adsorption quantity and activation degree of reactants, reduce the possibility of electron-hole recombination and effectively enhance photocatalysisefficiency. Moreover, the hybrid material of the invention has high stability and is improved in cyclic utilization stability in photocatalysis.

The invention discloses a strong-acid-resistant high-strength anticorrosive paint which comprises the following components in parts by mass: 25-28 parts of epoxy resin, 22-26 parts of polyurethane, 9-13 parts of silicon dioxide, 5-7 parts of titanium dioxide, 3-6 parts of zinc powder, 2-5 parts of barium sulfate, 4-6 parts of graphite, 7-9 parts of diacetone alcohol, 5-9 parts of polytetrafluoroethylene, 7-11 parts of polydimethylsiloxane, 4-8 parts of carboxymethyl cellulose, 1-3 parts of tributyl phenol polyethenoxy ether and 33-45 parts of deionized water. The invention also discloses a preparation method of the strong-acid-resistant high-strength anticorrosive paint. The product can resist corrosion of strong acid and strong alkali, performs the protective and anticorrosive functions on equipment in extreme weather, and has the advantages of excellent mechanical properties, high scrub resistance, high aging resistance, high powdering resistance, higher weather resistance, higher wear resistance, better high-temperature resistance, high safety and environment friendliness.

The invention provides a preparation method of an activated zeolite molecular sieve supported titanium dioxide photocatalysis material. The method comprises the following steps: activating natural zeolite molecular sieve to obtain activated zeolite molecular sieve; and mixing and stirring the activated zeolite molecular sieve, tetrabutyl titanate, acetic acid, nitric acid and anhydrous ethanol, and carrying out ultrasonic treatment, stirring, ageing, drying and calcining to obtain the activated zeolite molecular sieve supported titanium dioxide photocatalysis material. The activated zeolite molecular sieve supported titanium dioxide photocatalysis material has larger specific surface area than an inactivated zeolite supported titanium dioxide material, and the specific surface area of the activated zeolite molecular sieve supported titanium dioxide photocatalysis material reaches 280.1 m<2> / g; the activated zeolite molecular sieve supported titanium dioxide photocatalysis material has better adsorption performance than the inactivated zeolite supported titanium dioxide material, and the adsorption rate of the activated zeolite molecular sieve supported titanium dioxide photocatalysis material reaches 94.7%; and additionally, the activated zeolite molecular sieve supported titanium dioxide photocatalysis material has high photocatalysis performance, and the photocatalysis degradation rate reaches 98.6%. The activated zeolite molecular sieve supported titanium dioxide photocatalysis material has wider aperture distribution than the inactivated zeolite supported titanium dioxide material.

The invention discloses a three-dimensional porous structure graphene-cerium dioxide composite photocatalyst. A three-dimensional porous structure graphene-cerium dioxide compound is prepared through hydrothermal reaction of graphene oxide and cerous chloride. The graphene-cerium dioxide compound has excellent photocatalytic performance, is capable of quickly degrading organic pollutants in wastewater, especially pesticides and other organic pollutants into pollution-free materials of H2O, CO2 and the like under the conditions of room temperature, atmospheric pressure and illumination, can be repeatedly utilized for multiple times, and has lasting photocatalytic activity. In addition, the three-dimensional porous structure graphene-cerium dioxide composite photocatalyst can be used as a material for a super capacitor, a lithium-ion battery and a fuel cell and is wide in application prospect.

The invention relates to a metal single atom loaded carbon-nitrogen polymer catalyst and a preparation method thereof. The preparation method comprises the following steps: mixing a carbon-nitrogen polymer with water, and carrying out hydrothermal treatment at 150-200 DEG C for 10-15 hours to obtain a hydroxyl-containing carbon-nitrogen polymer; mixing a hydroxyl-containing carbon-nitrogen polymerwith water, carrying out ultrasonic treatment, adding a metal source solution, performing stirring for 8-24 hours in a dark place, performing separating, drying, and calcining to obtain the metal monatomic supported carbon-nitrogen polymer catalyst. The preparation method of the metal single atom loaded carbon-nitrogen polymer is simple, high in universality and accurate and controllable in single atom position loading position, and the prepared metal single atom loaded carbon-nitrogen polymer catalyst is high in loading capacity, rapid in in-plane charge transmission, excellent in photocatalytic performance and high in stability.

The invention relates to the technical field of hydrometallurgy, in particular to a method for preparing flower-like structure zinc oxide powder from low-and medium-grade zinc oxide ores. The method comprises grinding the low-and medium-grade zinc oxide ores, and mixing the low-and medium-grade zinc oxide ores with ammonium bisulfate evenly for roasting to obtain a roasted material, adding water for dissolving the roasted material, filtering the roasted material, using filter residue to extract valuable components such as lead, strontium and silicon, precipitating iron by an ammonium jarositemethod and precipitating aluminium by an aluminium hydroxide form to obtain a purified solution with the iron and the aluminium removed; mixing the purified solution with an alkali solution in a molarratio of Zn<2+>: OH<-> of 1:2-10, and placing the purified solution and the alkali solution in a hydrothermal reactor, and adding a PEG 20000 or SDBS solution with a mass concentration of 5-15% to the hydrothermal reactor, homogeneously stirring, reacting at 120-220 DEG C for 4-12 h, filtering, washing and drying to obtain the flower-like structure zinc oxide powder.

The invention provides an air cleaning agent containing a catalytic agent, and relates to the technical field of environment-friendly material air cleaning. In order to solve the technical problems that an existing air cleaning agent containing a photocatalyst on the market has a single function and poor in weather fastness, cannot achieve purification or freshness for a long time, and is low in cleaning efficiency, the air cleaning agent containing the catalytic agent is prepared, the air cleaning agent adopts the catalytic agent as a main purification object, natural plant components and other auxiliaries are adopted, the air cleaning agent is prepared through the reasonable proportion, use is safe and convenient, the performance of the components are brought into full play and utilized,photocatalyst particles have the good weather fastness and can have the maximum purification effect in actual application, formaldehyde and other hazardous gas in air can be effectively removed, andthe deodorization, sterilization and anti-fouling performance can be achieved.

The invention relates to a process for producing a stable solution containing Anatase titanium oxide intended to be deposited on a substrate in order to obtain a transparent photo-catalytic coating. Such a process includes the preparation of an initial stabilized peptized solution including a titanium precursor material, an organic solvent, an acid agent, the mixing of said initial solution with a large amount of water, the pH of the obtained intermediate solution being less then 3, subjecting said intermediate solution and its dispersion to a heat-treatment, the exchange of water by an organic solvent with low surface tension to obtain a final solution that is finally dispersed. The invention particularly allows to coat thermally sensitive and / or transparent substrates with photo-catalytic films of high optical quality.

The invention belongs to a preparation method of a 3D ordered macroporous polyaniline (OM PANI) / TiO2 composite photocatalytic material and application thereof. The preparation method comprises the following steps: A, dipping 3-10g of prepared 3D OM PANI / TiO2 material in 50ml of a hydrochloric acid containing 0.05-0.5ml of an aniline monomer, and carrying out ultrasonic oscillation for 5-20 minutes; B, putting a reaction system in the step A into ice bath, dropwise adding a monomer initiator with the concentration of 0.25-1%, and reacting for 2-5 hours; C, washing a sample by adopting ethyl alcohol and / or diethyl ether, and washing the sample with distilled water; D, drying at the low temperature of 60-80 DEG C so as to obtain the sample. The 3D OM PANI / TiO2 composite material is used for combining the favorable conducting performance of PANI as well as characteristics of the relatively low energy gap with the TiO2 catalytic performance, meanwhile improves the defects that the photoproduction electron-hole recombination rate of a single TiO2 material is high and the visible light response is poor, and achieves the effects of improving the TiO2 photocatalytic quantum efficiency and reinforcing the visible light absorption; meanwhile, the material is at hundreds of nanoscales, is difficult to reunite, is easy to settle, and is good in regeneration performance.

The invention relates to a titanium sponge loading TiO2 photocatalyst and a preparation method thereof. The titanium sponge loading TiO2 photocatalyst is prepared by purifying raw materials and carrying out oxidation reaction under the reaction temperature of 75-250 DEG C and the reaction atmospheric pressure of 2-10 with porous foam metal titanium sponge as a carrier and a titanium source. The photocatalyst has the advantages of large specific surface area, strong adsorbability, higher photocatalytic performance both under UV lights and in the sun, recovery and repeated recycle without photocatalytic activity declining, simple procedure, safe operation, little equipment investment, low production cost, no secondary pollution and the like and is particularly suitable for waste water treatment.

The invention discloses a heterojunction photo-anode for driving reduction of carbon dioxide and a preparation method and application of the heterojunction photo-anode. The preparation method comprises the steps that firstly, a WO3 nano-sheet array is synthesized through a hydrothermal method, then by adopting a secondary hydrothermal method, a Bi2S3 nano-material grows on the surface of a WO3 nano-sheet, and therefore the WO3 / Bi2S3 heterojunction photo-anode used for driving the reduction of CO2 is obtained. Compared with an original WO3 photo-anode, the constructed WO3 / Bi2S3 heterojunction photo-anode expresses a more excellent photoelectrochemical property and more excellent photoelectrocatalysis capacity.

The invention belongs to the technical field of photocatalytic materials and specifically relates to a Ti<3+> self-doped titanium dioxide photocatalyst and a preparation method thereof. By utilizing a Ziegler-Natta method, the preparation method specifically comprises the following steps: dissolving butyl titanate, aluminum acetylacetonate and acetylacetone into ethanol, and dissolving water into ethanol; stirring to mix the two solutions; standing, so as to obtain sol; drying the sol, so as to obtain gel; grinding the obtained gel into powder; and carrying out high-temperature treatment, and naturally cooling, so as to obtain an ash black product Ti<3+>-TiO2. The photocatalytic capacity of TiO2 is improved by the product from the aspects of light absorption range, charge carrier transfer capacity and interface reaction speed, and the product has good photocatalytic activity and can be applied to the fields of photocatalytic degradation of organic pollutants, photolysis hydrogen production of water and photo-reduction of CO2.

The invention discloses a preparation method of a photocatalyst, and particularly relates to a preparation method of nanometer silver-loaded titanic oxide photocatalyst. The preparation method comprises the following steps: putting 20g of hydrogen peroxide and 2.5g of sodium hydroxide into a reaction kettle; after dissolving, slowly adding 20g of titanium tetrachloride; heating and pressurizing under sealing, preserving heat, cooling and refluxing to prepare a titanium dioxide nanocrystalline hydrosol for later use; adding 0.017g of silver nitrate into 10ml of absolute ethyl alcohol and then adding into 20ml of ethanol with 0.10g of polyvinylpyrrolidone, and reacting to obtain spherical nanometer silver for later use; reacting 0.01g of the prepared spherical nanometer silver with 10g of the prepared titanium dioxide nanocrystalline hydrosol and further carrying out ultrasonic dispersion for 30 minutes to prepare a photocatalyst. The photocatalyst prepared by the invention is characterized by good dispersibility, stable storage and stronger photocatalytic performance compared with that of nanometer titanium dioxide simultaneously when reserving the antibacterial property and other properties of nanometer silver.

The invention relates to photocatalytic ceramsite as well as a preparation method and an application thereof. Firstly, the ceramsite is prepared from sludge, clay, activated carbon or wood flour, calcium hydroxide and other raw materials, Sm-doped TiO2 nanopowder is prepared with a sol-gel method, TiO2 nanotubes are prepared with a hydrothermal method, supporting of the TiO2 nanotubes and ceramsite is completed, finally, porous ceramsite is subjected to gas-phase sintering in the presence of N2, and doping modification of TiO2 nanotubes by N elements is completed. The raw materials are cheap, the process is delicate, the prepared ceramsite has uniform and adjustable sizes, the supported modified TiO2 nanotubes have moderate lengths, uniform diameters and large surface area and have high attachment force with ceramsite, the photocatalytic activity is high, and the photocatalytic ceramsite can be used for photocatalysis treatment of organic wastewater and can also be used for oxidative degradation of gas-phase organic matters.