75results about How to "Improve photocatalytic reactivity" patented technology

The invention relates to a Nickel single-active site graphite-phase carbon Nitride-based photocatalytic material as well as a preparation method and application thereof, in the photocatalytic material, Ni is dispersed in a g-C3N4 framework in a single-atom-level degree to form active sites, and the molar content of the Ni is 1-5%. the nickel single-active site graphite-phase carbon nitride-based photocatalytic material has a large specific surface area, is good in dispersion in an aqueous solution, and can effectively inhibit the recombination of photo-generated carriers, the reaction activitysites of the surface of the g-C3N4 are increased, the photocatalytic hydrogen production efficiency can be remarkably improved, and the photocatalytic reaction activity of the g-C3N4 can be improved.

The invention belongs to the field of new energy resources and particularly relates to a method for compounding a carbon quantum dot with a metal organic skeleton material. A catalyst prepared by virtue of the method is applied to the reduction preparation of CO through photocatalysis of CO2. For solving the problem that the activity of CO2 obtained through photocatalytic reduction of a single metal organic skeleton at present is low, an aminated metal organic skeleton material and the carbon quantum dot with carboxylic acid are combined to obtain a catalyst, and the obtained catalyst is usedfor preparing CO from CO2 through high-efficiency photocatalytic reduction. The catalyst can simultaneously have the advantages of the metal organic skeleton and the carbon quantum dot and further hasvery high photocatalytic reaction activity due to the synergistic effect of the metal organic skeleton and the carbon quantum dot. The constitution components of the catalyst are easily adjusted, andthe metal organic skeleton material with amino and the carbon quantum dot with carboxylic acid can be arbitrarily selected. The method is simple in synthesis process flow and strong in operability and has wide application prospects.

The invention belongs to the field of photocatalytic materials, in particular to a preparation method and application of a Z-type photocatalyst MgAl LDH/CN-H. The preparation method comprises the following steps: firstly, preparing g-C3N4, and preparing CN-H by acidizing and modifying g-C3N4; secondly, preparing MgAl LDH from raw materials of magnesium nitrate, aluminum nitrate, citric acid and urea by the hydrothermal reaction in an alcohol and water mixed system; and finally, assembling and forming the Z-type photocatalyst MgAl LDH/CN-H by the electrostatic attraction action of positively charged MgAl LDH and negatively charged CN-H. The prepared photocatalyst exhibits excellent photocatalytic performance under simulated solar irradiation, the degradation rate for tetracycline hydrochloride can reach to be more than 99%, and the degradation rate is 23 times higher than that of a single photocatalyst of g-C3N4 and 7.5 times higher than that of a single photocatalyst of MgAl LDH, so that the photocatalyst has relatively good application prospects.

The invention provides a transition metal phosphide/g-C3N4 composite material as well as a preparation method and application thereof. According to the transition metal phosphide/g-C3N4 composite material, transition metal phosphide is loaded on g-C3N4, the compounding of photoelectrons and holes can be remarkably reduced and hydrogen evolution over-potential is reduced, so that the photo-catalytic reaction activity of the g-C3N4 is improved; the transition metal phosphide/g-C3N4 composite material can be applied to a photo-catalytic reaction system and especially can be used in a photo-catalytic water decomposition and hydrogen production system. According to the preparation method provided by the invention, the interface bonding performance of the transition metal phosphide and the g-C3N4 can be improved so that the catalytic activity is improved; furthermore, the preparation method is simple to operate, wide in applicability, good in repeatability and wide applicable range; a reliable scheme is provided for reduction of the photo-catalytic cost and photo-catalytic hydrogen production.

The invention discloses a photocatalytic material with nano TiO2 loaded on graphene-foamed nickel and a preparation method of the photocatalytic material. The foamed nickel is taken as a base, a graphene film layer is deposited on the foamed nickel to form a graphene-foamed nickel composite carrier, a TiO2 sol film layer is formed on the graphene-foamed nickel composite carrier, the graphene is combined with the foamed nickel to serve as an organic carrier loaded with the nano TiO2, a three-layer structure is formed, the carrier is firmly loaded with the nano TiO2, and the photocatalytic activity of the TiO2 is greatly improved. An electrophoretic deposition method is used and a polyurethane foam serves as a base to prepare the foamed nickel with high specific surface area, the foamed nickel is then loaded with the graphene through the electrophoretic deposition method, the grapheme film layer is formed, a sol-gel method is used, no binder is used, the nano TiO2 with higher photocatalytic activity is loaded on the graphene-foamed nickel composite carrier, the whole process is simple in operation, the period is short, and the manufacturing cost is low.

The invention discloses a preparation method of a cuprous oxide and tritanium dicarbide heterojunction composite material and application thereof for photocatalytic reduction of carbon dioxide. The preparation method comprises the following steps: etching Ti3AlC2 with HF (Hydrofluoric Acid) to prepare tritanium dicarbide; preparing tritanium dicarbide nanosheets in a DMSO (Dimethylsulfoxide) stirring and ultrasonic mode; and carrying out in-situ growth on Cu2O on the tritanium dicarbide nanosheets under a hydrothermal condition, thereby obtaining the cuprous oxide and tritanium dicarbide heterojunction composite material. By adopting the preparation method, a Cu2O/MXene heterojunction composite material is prepared for a first time, the composite material is used as a photocatalyst for simulating CO2 reduction under radiation of an xenon lamp, and due to dense contact of hexagram-shaped Cu2O with two-dimensional MXene nanosheets, not only is the conductivity of the catalyst improved, but also the separation efficiency of electron holes is improved, and the optical absorption and the photocatalytic activity of Cu2O are improved.

The invention provides a preparation method of a carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst, the method comprises the following steps: taking melamine and urea asprecursors, preparing micro heterojunction g-C3N4 by a thermal condensation method, and stripping massive g-C3N4 by using oxygen as an etching gas to obtain flaky g-C3N4; mixing nano cellulose and theflaky g-C3N4, and performing heat treatment in a tube furnace under the protection of argon to obtain the carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst; putting thecarbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst in a mixed solution of water and ethanol to prepare hydrogen peroxide under visible light irradiation, wherein the content of the hydrogen peroxide is tested by a POD/DPD method. The product prepared by the method has the advantages of good conductivity, large specific surface area, high photocatalytic reaction activity, high charge carrier transmission efficiency and the like, is an environment-friendly photocatalytic material, and can be used for preparing the hydrogen peroxide through photocatalysis under visible light.

The invention relates to a photocatalyst for degrading organic pollutants and a preparation method thereof. The photocatalyst is vanadium-yttrium composite oxide, a general formula of chemical composition is VxY1O(2.5x+1.5), and x is vanadium-yttrium mol ratio, and is more than or equal to 0.3 and is less than or equal to 3.5. The preparation method for the photocatalyst comprises the following steps that: a yttrium nitrate solution and an ammonium metavanadate solution are mixed to generate a precipitate under the condition of stirring according to the vanadium-yttrium mol ratio; and the precipitate is aged through the stirring and then is evaporated to remove moisture, an obtained solid is dried and finally is baked at a temperature of between 400 and 600 DEG C, and a finished photocatalyst product is obtained after the cooling. The invention also relates to a catalyst for precious metal Pt supported by V1.5Y1O5.25 composite oxide and a preparation method thereof. The photocatalyst has the advantages of simple preparation method and low cost, good visible light degradation property to the organic pollutants, and higher commercial application prospect.

The invention relates to a foamed nickel-loaded zinc titanate photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: taking foamed nickel as amatrix, uniformly coating zinc titanate template agent mixed suspension on a thin layer to form a zinc titanate/template agent composite carrier; soaking and dissolving out by the template agent, anddrying to form the foamed nickel-loaded zinc titanate (ZnTiO3) photocatalytic material. The preparation method specifically comprises the following steps: forming turbid liquid A from polytetrafluoroethylene (PTFE) and ethanol, and adding ZnTiO3 and the template agent into the turbid liquid A according to a certain ratio so as to form turbid liquid B; uniformly coating the turbid liquid B onto thefoamed nickel, drying and soaking into the template dissolved-out solution for dissolving out the template agent, and flushing with deionized water and drying; and finally obtaining the foamed nickel-loaded ZnTiO3 photocatalytic material. According to the method disclosed by the invention, preparation of the foamed nickel-loaded ZnTiO3 photocatalytic material is realized, the binding force between materials is firm, and the prepared product has high catalytic activity on organic matter degradation in an ultraviolet light range, and has obvious advantages of being long in service life, easy torecover, free in secondary pollution and the like; and the whole process is simple in operation, short in cycle, energy-saving and low in manufacturing cost. The invention relates to a photocatalyticmaterial for water treatment.

The invention relates to a preparation method of a water-phase cerium fluoride microparticle and application thereof, and belongs to the technical field of photocatalysis. The preparation method has the advantages that by using ceric ammonium nitrate or cerous nitrate as a cerium source, and using ammonium hexafluorotitanate or ammonium fluoride as a fluorine source, the water-phase cerium fluoride microparticle with good dispersivity is prepared by a simpler and mild preparation technology; the good phtocatalysis property is realized under the visible light condition, and the application field of cerium fluoride is widened.

The invention discloses a high efficient visible-light response catalyst, which is characterized in that the catalyst is of a composite oxide, the chemical composition general formula is xVSmO, wherein x is n(V)/n(Sm), and x is more than 0.5 and less than 4.5. A preparation method for the catalyst comprises the following steps of: mixing samarium nitrate solution and ammonium metavanadate solution by stirring to obtain precipitate, then rotationally evaporating for removing water, and roasting the mixture in a muffle furnace at 300-700 DEG C after the mixture are dried in a baking oven. The invention has simple preparation technique; the prepared VSmO photocatalyst has excellent capability of catalyzing and oxidizing organic pollutants by visible light; after being loaded with precious metals, the photocatalytic activity and the deep oxidation capability of the catalyst can be obviously improved.

The invention discloses a silver oxide nano particle/molybdenum sulfide nanosheet heterostructure ultrasonic near infrared catalyst and a preparation method thereof. The silver oxide nano particle/molybdenum sulfide nanosheet heterostructure ultrasonic near infrared catalyst and the preparation method thereof have the advantages that the prepared catalyst uses piezoelectric material molybdenum sulfide as the matrix, the surface of the matrix is loaded with silver oxide nano particles with high catalytic activity and a near infrared photocatalysis effect, the catalyst has the properties of the excellent infrared photocatalyst silver oxide nanoparticles and molybdenum sulfide nanosheets and the piezoelectric effect of the molybdenum sulfide nanosheets under ultrasonic action, carrier separation is benefited, and the generated carrier promotes the photocatalytic activity of the silver oxide; the silver oxide nano particle/molybdenum sulfide nanosheet heterostructure is prepared by the reaction of the hydrothermal precipitation method, and the preparation method is simple in synthesizing process and equipment, simple to operate, low in production cost, high in efficiency, short in reaction period, good in repeatability and promising in industrial application prospect.

The invention discloses a foam ceramic supporter, a TiO2 photocatalyst supported on the foam ceramic supporter and a preparation method thereof. The foam ceramic supporter includes foam ceramic and acomposite oxide, wherein the foam ceramic has a porous foam structure, the pore edges in the foam ceramic contain three-dimensional penetrating micro-scale pore channels, the composite oxides distributing in the surface of the pore edges and the interior of the pore channels. The preparation method of the foam ceramic supporter includes: impregnating the foam ceramic with a composite oxide precursor slurry to obtain the foam ceramic supporter. The TiO2 photocatalyst supported by the foam ceramic supporter is high in photo-catalytic activity, wherein the TiO2 is not liable to lose, so that thephotocatalyst has good activity stability and is especially suitable for photocatalytic purification of gas or liquid.

The invention relates to an antibacterial carved stone ceramic tile and a preparation method thereof, and belongs to the technical field of ceramic tile processing and manufacturing. The antibacterialcarved stone ceramic tile is prepared from kaolin, ball clay, potassium feldspar, porcelain clay, pyrophyllite, coating glaze, a composite photocatalytic antibacterial agent and bentonite through steps of: ball-milling pulping, forming, one-time sintering, ink jetting, glazing with addition of a composite photocatalytic antibacterial agent, secondary sintering, and polishing and trimming. A TiO2/Ag2O composite microsphere photocatalytic antibacterial agent which is prepared through high-temperature calcination by utilizing a sol-gel method is added, wherein the photogenerated holes and electrons generated by TiO2 and Ag2O can be mutually migrated, so that the recombination rate of the photogenerated holes and the electrons is reduced, the photocatalytic activity is improved, and the photocatalyst has the advantages of large specific surface area, high photocatalytic reaction activity, high antibacterial efficiency and the like, and can stably play an antibacterial role for a long time. A good air purification effect is achieved, and substances such as TVOC in air can be effectively removed. The method is simple in process, convenient to operate and suitable for large-scale production.

The invention relates to a foamed nickel-loaded zinc titanate/tourmaline photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: taking foamed nickel as a matrix, uniformly coating zinc titanate/tourmaline light/template agent mixed suspension on a thin layer to form a zinc titanate/tourmaline/template agent composite carrier; soaking and dissolving out by the template agent, and drying to form the foamed nickel-loaded zinc titanate/tourmaline photocatalytic material. The preparation method specifically comprises the following steps: forming turbid liquid A from polytetrafluoroethylene (PTFE) and ethanol, and adding zinc titanate, tourmaline and the template agent into the turbid liquid A according to a certain ratio so as to form turbid liquid B; uniformly coating the turbid liquid B onto the foamed nickel, drying and soaking into the template dissolved-out solution for dissolving out the template agent, and flushing with deionized water and drying; and finally obtaining the foamed nickel-loaded zinc titanate/tourmaline photocatalytic material. According to the method disclosed by the invention, preparation of the foamed nickel-loaded zinc titanate/tourmaline photocatalytic material is realized, the binding force between materials is firm, and the prepared product has high catalytic activity on organic matter degradationin an ultraviolet light range, and has obvious advantages of being long in service life, easy to recover, free in secondary pollution and the like; and the whole process is simple in operation, shortin cycle, energy-saving and low in manufacturing cost. The invention relates to a photocatalytic material for water treatment.

The invention relates to the field of sewage treatment, and in particular relates to a method for enhancing photodegradation of organic dyes in wastewater by acetaldehyde. The method includes the following steps: adding a certain amount of hydrogen peroxide into the wastewater containing the organic dyes, and performing stirring for a certain period of time to obtain micro-oxidized wastewater; andadding a certain amount of an acetaldehyde solution into the micro-oxidized wastewater to obtain a pre-treatment solution, introducing the pre-treatment solution into a container, wherein the interior of the container is provided with multiple layers of photocatalytic plates, and irradiating the container with ultraviolet light for a certain period of time to obtain degraded wastewater, wherein the surfaces of the photocatalytic plates contain a certain amount of metal silver and rare earth elements. The method overcomes the defects of lower photocatalytic efficiency and poor recycling performance of a method for photodegrading organic dyes in wastewater used in the prior art, and has the advantage of rapidly degrading the organic dyes in the water under conditions of low ultraviolet light intensity; and meanwhile, the addition content of a photocatalytic accelerator is low, and the photocatalytic efficiency is not reduced with time.

The invention provides a BiOCl/graphite-like phase carbon nitride composite photocatalyst with a (010) crystal face exposed and a preparation method and application thereof. A light composite method is adopted, BiOCl is illuminated to generate electrons on the (010) crystal face, and holes are formed in the (100) and (001) crystal faces. The holes attract the layered structures g-C3N4 with negative charge through static electricity, the layered structures g-C3N4 are loaded on the (100) and (001) crystal faces with P4/nmm (129) BiOCl as tetragonal phases and space point groups, and the BiOCl (010) crystal face is exposed to form the BiOCl/g-C3N4 composite photocatalyst with the (010) crystal face exposed. The formed BiOCl/g-C3N4 composite photocatalyst with the (010) crystal face exposed has relatively high photocatalytic activity.