57results about How to "Improved visible light response" 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 discloses a preparation method and application of a novel visible light response compound photocatalyst for growth of ZnIn2S4 on the surfaces of TiO2 hollow spheres. The method can be applied to treatment of water body pollution. The method includes the following steps of ultrasonically dispersing the obtained TiO2 hollow spheres in water, and then preparing a ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst through an in-situ hydrothermal method. The prepared ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst can be used for catalyzing and degrading tetracycline hydrochloride, levofloxacin and methyl orange under visible light. The obtained ZnIn2S4/TiO2 nanometer compound hollow sphere photocatalyst can capture more visible light and has a matched band gap structure, photoelectron and hole separation efficiency can be improved, good interface contact promotes photoelectron transmission, and the visible light catalytic activity of the catalyst is remarkably improved.

The invention discloses a simple preparation method of a high-dispersion nickel oxide cluster modified carbon nitride photocatalyst for decomposing water to produce hydrogen. The simple preparation method comprises the following steps: adjusting the pH (Potential of Hydrogen) value of a mixture of g-C3N4, nickel chloride hexahydrate and de-ionized water with ammonia water by adopting a simple impregnation-precipitation method; stirring and standing at room temperature; evaporating to remove all the water at 100 DEG C to 150 DEG C; calcining to obtain the high-dispersion nickel oxide cluster modified two-dimensional carbon nitride photocatalyst. The preparation process of the photocatalyst is simple; the prepared photocatalyst has a large specific surface area and NiO is loaded on the surface of the two-dimensional g-C3N4 in a high-dispersion nickel oxide cluster form, so that the quantity of reaction active sites of the photocatalyst is increased and the visible light response degree is improved. Compared with a granular NiO/g-C3N4 photocatalyst, the photocatalyst disclosed by the invention has a more excellent photocatalytic property in a process of catalyzing the decomposition of the water to produce the hydrogen; under the condition that NiO loading amounts are the same, the yield of the hydrogen is improved by 7 to 8 times.

The present invention discloses a visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst and a preparation method thereof. The preparation method comprises the steps of (1) preparing a suspension system A containing BiVO4 nano particles, and a suspension system B containing a TiO2 sol-gel and graphene oxide; (2) proportionally mixing up the suspension system A and the suspension system B, conducting the heating treatment, separating and drying to obtain a BiVO4/TiO2/graphene oxide composite material; (3) suspending the BiVO4/TiO2/graphene oxide composite material in short-chain alcohol, adding a reducing agent, conducting the hydrothermal reaction and drying to obtain the visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst. The preparation method is simple and easy to operate, and low in cost. Based on the preparation method, the structure and the properties of the composite light catalyst can be regulated and controlled through simply changing the conditions of reactions and heat treatments.

The invention discloses a method for preparing novel carbon quantum dot/flower-shaped indium and calcium sulfide (CQDs/CaIn2S4) composite photocatalysts, and belongs to the field of environmental protection. The method includes preparing the CQDs/CaIn2S4 composite photocatalysts by the aid of in-situ hydrothermal processes at certain temperatures. The CQDs/CaIn2S4 composite photocatalysts prepared by the aid of the method can be applied to catalytically degrading tetracycline hydrochloride solution under the sunlight or visible light. The method has the advantages that the method includes simple technologies, is free of pollutant discharge in preparation procedures and is short in preparation period and low in energy consumption and cost, is a green synthesis technique, and the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be prepared on a large scale; the visible light response and the adsorption capacity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be improved after CQDs (carbon quantum dots) are compounded, the service lives of electrons-holes can be prolonged, photoelectron transmission can be promoted, and the visible light photocatalytic activity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be greatly improved.

The invention provides a preparation method of a nitrogen-doped titanium dioxide photochemical catalyst loaded with a foam metal carrier. In the preparation method provided by the invention, a vacuum arc ion plating process is used and a prepared nitrogen-doped titanium dioxide film of a photochemical catalyst can be uniformly distributed on the surface of a porous metal, so that the contact areafor a catalytic reaction of the photochemical catalyst is increased and the photocatalytic activity of the photochemical catalyst is higher.

The invention discloses a two-dimensional sheet layer material modified MXene/TiO2 preparation method, wherein MXene comprises Mo2TiC3, Ti3C2, Ti2C, Nb2C, Nb4C3 and the like, and the MXene/TiO2 composite material is prepared by using MXene as a substrate through an in-situ method. The process comprises: preparing a two-dimensional sheet layer material MXene with a good layered structure, adding tetrabutyl titanate to MXene, and adding hydrofluoric acid and absolute ethanol to obtain the MXene/TiO2 composite material with uniformly distributed TiO2. According to the present invention, the preparation process is simple; the TiO2 in the obtained MXene/TiO2 composite material is distributed on the surface and the periphery of the MXene sheet layers, the ratio is adjustable, the visible light absorption of the composite material is enhanced, and the forbidden band width of the composite material is significantly reduced compared with TiO2 so as to easily achieve the electron-hole pair separation; and the novel MXene/TiO2 composite material can be used as a catalyst material in the field of photoelectrocatalysis.

The invention provides a graphite-phase-like carbon nitride-(110) crystal face bismuth vanadate Z-type heterojunction photocatalyst and a preparation method and application thereof. The method comprises the following steps of 1, preparing exposed (010) crystal face BiVO4 powder and H2SO4 modified g-C3N4 powder; 2, adding the exposed (010) crystal face BiVO4 powder into water, and conducting ultraviolet illumination; dissolving the modified g-C3N4 powder into water, and conducting ultraviolet illumination; 3, adding a BiVO4 solution after ultraviolet treatment into a g-C3N4 solution which is subjected to ultraviolet illumination and negatively charged to obtain a precursor solution, and conducting ultraviolet illumination on the precursor solution to obtain g-C3N4-(110) crystal face BiVO4Z-type heterojunction photocatalyst powder. The catalyst enlarges the response range of visible light, reduces the recombination rate of electrons and hole pairs, improves the separation efficiency of charge carriers and improves the photocatalytic performance of the BiVO4-based composite photocatalyst.

The invention discloses a visible-light responded compound catalyst for degrading organic pollutants in salt-containing wastewater and a preparation method of the visible-light responded compound catalyst. The preparation method comprises the following steps: (1) mixing nano-silica, absolute ethanol and a sodium hydroxide water solution, and carrying out stirring and adsorbing in a water bath until a balanced adsorption system is formed; (2) dropwise adding an ethanol solution in which tetrabutyl titanate and iron salt are dissolved into the balanced adsorption system, so as to react to obtain a suspension system containing compound particles; and (3) transferring the suspension system into a high-pressure kettle, adding an ethanol solution in which rare earth ions are dissolved while stirring, closing the high-pressure kettle, carrying out thermal treatment, cooling and then separating reaction liquid, washing, and drying so as to obtain the visible-light responded compound catalyst. According to the preparation method, the crystallization process of TiO2 and Fe2O3 and the doping process of rare earth metal ions are finished by virtue of solvothermal in one step, so that the method is simple, and conditions are mild; by adjusting parameters in the reaction and thermal treatment processes, the shape and the performance of the photocatalyst can be effectively regulated and controlled.

The invention discloses a CsPMo/g-C3N4-Bi2O3 photocatalyst and a preparation method therefor and application thereof in phenolic wastewater treatment. The preparation method for the CsPMo/g-C3N4-Bi2O3 photocatalyst comprises the steps: (1) thoroughly dispersing g-C3N4 into water, then, sequentially adding Bi2O3, phosphomolybdic acid and cesium carbonate into the dispersion, carrying out uniformly mixing, and carrying out reaction to produce yellow precipitates; and (2) drying and grinding the obtained yellow precipitates, thereby obtaining the CsPMo/g-C3N4-Bi2O3 photocatalyst. The photocatalyst disclosed by the invention is applied to the photocatalytic treatment of phenolic wastewater and is added into the phenolic wastewater, stirring is carried out at a dark place until adsorption equilibrium is achieved, and reaction is carried out under visible light irradiation. The preparation method for the photocatalyst, disclosed by the invention, is simple, the degree of visible light response is increased, the photoproduction electron and hole separating effect is good, the effect of treating the phenolic wastewater is good, and no secondary pollution is caused.

The invention discloses a surface-modified heterogeneous knot titanium dioxide photonic crystal thin film catalyst. The catalyst is of a three-dimensional ordered inverse opal structure and has an anatase/rutile heterogeneous knot crystal structure, and a photonic band gap is located at a visible light absorption region of the catalyst. The invention further discloses a preparation method of the surface-modified heterogeneous knot titanium dioxide photonic crystal thin film catalyst. The preparation method comprises the following steps: preparing TiO2 sol by virtue of an in-situ modification method; preparing polystyrene microsphere colloidal crystal template by virtue of a vertical deposition method; preparing a nano-TiO2 photonic crystal with the three-dimensional ordered inverse opal structure by virtue of a dipping-vertical pulling method; and carrying out high-temperature calcination, so as to obtain the surface-modified heterogeneous knot titanium dioxide photonic crystal thin film catalyst. The catalyst has very strong visible-light responsivity, and the visible light chemical reaction is enhanced by virtue of a slow photon effect of the photonic crystal; by utilizing the heterogeneous knot structure, the separation of photon-generated current carriers is promoted, and the visible light catalysis capacity is improved; and furthermore, equipment is simple and easy to operate.

The invention discloses a preparation method of a cadmium sulfide carbon-based composite material serving as a photoelectric catalyst. The preparation method is simple in preparation process, does not need expensive devices, and an obtained product is high in quality and good in performance. According to the technical scheme, the preparation method comprises the steps that 1, the gelling principle of carrageenan is utilized to dropwise add the carrageenan dissolved at high temperature to an ethanol solution of hydrochloric acid to form gel, and gel impurity removing treatment is performed; 2, the carrageenan gel subjected to impurity removal is immersed into a certain concentration of cadmium acetateethanol solution, and multiple times of treatment are performed; 3, the gel is washed with ethyl alcohol and water step by step, the treated gel is put in a refrigerator, freeze drying is performed to form cadmium-carrageenan aerogel; 4, the cadmium-carrageenan aerogel is calcined in a tubular furnace by adopting a certain carbonization process, then high-temperature decarbonization is performed in carbon dioxide to obtain a cadmium sulfide carbon-based composite photoelectric catalyst; 5, the photoelectron catalysis performance of the product is tested by using an electric chemical workstation and an xenon lamp system.

The invention relates to a graphite phase carbon nitride modified antimony doped tin dioxide composite photoelectric catalysis electrode and a preparation method and applications thereof. The composite photoelectric catalysis electrode comprises antimony doped tin dioxide and graphite phase carbon nitride; the mole ratio of tin dioxide to graphite phase carbon nitride is 9:1-5; and the preparationmethod comprises following steps: preparing tin-antimony sol gel, adding graphite phase carbon nitride at the same time, and preparing the composite photoelectric catalysis electrode by a sol gel coating-pyrolysis method. Compared with an antimony doped tin dioxide electrode, the results of photoelectric property tests show that the provided electrode has higher catalytic activity and stronger absorption of visible light; and the electrode has a potential application prospect in the fields of solar energy utilization and wastewater treatment.

The invention discloses a preparation method of tubular g-C<3>N<4> with a visible-light response function and belongs to the field of photocatalytic semiconductor material preparation technologies. The preparation method comprises the steps that (1) melamine and cyanuric acid are mixed and dissolved in ultrapure water according to an arbitrary proportion, magnetic stirring is performed, and a uniform mixed solution is formed; (2) then, the solution is transferred to a stainless steel autoclave for a reaction, and a precursor of a synthetic product is obtained; (3) the obtained precursor is dried after being washed with ultrapure water; and (4) after the dried precursor is calcined in nitrogen, the tubular g-C<3>N<4> with the visible-light response function is obtained. According to the preparation method, the one-dimensional tubular g-C<3>N<4> is prepared through high-temperature calcination, band gap width of the tubular g-C<3>N<4> is remarkably reduced, visible-light response of thetubular g-C<3>N<4> is improved, and the charge transport capability of the tubular g-C<3>N<4> is enhanced through a tube separation mode; and application of the tubular g-C<3>N<4> with the visible-light response function in the photocatalytic field comprises degradation, hydrogen production, nitrogen fixation, bacterial resistance and the like.

The invention discloses a vanadium diselenide doped nickel cobalt selenide yolk shell structure micron cuboid counter electrode catalyst and a preparation method thereof. The preparation method comprises the following steps of adding a mixed solution of cobalt acetate and nickel acetate into an ethanol solvent in which polyvinylpyrrolidone is dissolved, and carrying out a heating reaction under a water bath condition to obtain a Ni-Co prism precursor precipitate; then carrying out water bath reaction on the precursor and ammonium metavanadate to obtain an intermediate NiCo-VOx so as to realize the doping of vanadium heteroatoms; and finally, further selenizing the intermediate at high temperature to obtain the VSe2-NiCoSex catalyst with a yolk-shell structure. The method of the present invention is mild and controllable in operation condition, short in reaction time and low in cost, and the prepared catalyst provides more active sites due to the synergistic effect of multiple different metal ions and the doping of vanadium heteroatoms. Meanwhile, the prepared catalyst has high specific surface area, porosity and good electro-catalytic performance, is used for dye-sensitized solar cells, and has photoelectric conversion efficiency of 9.50%.

The invention discloses a monolayer carbon nitride nanoflake and bismuth plasma co-modified bismuth oxide-based electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving bismuth nitrate hexahydrate into ethylene glycol containing HNO3 to obtain a solution A; putting a C3N4 solid into an ethanol solution, carrying out ultrasonic exfoliation to obtain ethanol suspension containing monolayer C3N4, centrifuging and taking supernate as a solution B; adding the solution B into the solution A, performing uniform dispersion anddispensing the mixed solution on conductive glass; carrying out vacuum drying and then calcining to obtain a Bi2O3-C3N4 thin film; then putting the Bi2O3-C3N4 thin film into an acidic KI solution forcarrying out ion exchange, washing and carrying out natural air drying to obtain Bi2O3-BiOI-C3N4; and putting Bi2O3-BiOI-C3N4 into a methanol solution, irradiating with a xenon lamp and taking out thethin film, and carrying out natural air drying to obtain a finished product. A visible light catalytic film with good constructing dispersion, high stability and good photocatalytic effect is constructed. The degrading effect of a photocatalyst on pollutants under the action of visible light is greatly improved while the problem that the photocatalyst is difficult to recover is effectively solved.

The invention discloses a preparation method and application of a nitrogen-doped sludge compost visible light photocatalytic material. Urea is used as a sludge aerobic composting product for supplementing a nitrogen source; under certain pressure and temperature conditions, a nitrogen-doped carbon nano porous material composed of C, O, N, Al, Si, Fe, Mg, Zn, Ti and other elements is synthesized through a hydrothermal carbonization method, and a method for degrading organic pollutants through visible light in an oxalic acid system through hydrothermal carbonization of sludge is constructed. According to the method, the sludge aerobic composting product is converted into an environmental remediation material, so that the resource utilization of the sludge is realized. The method is low in cost, simple to operate and easy to popularize, and an efficient visible light catalytic material is provided for organic wastewater treatment.

The invention relates to a use of TiO<2>/WO<3>/g-C<3>N<4> thoroughly mesoporenanofiber in high efficiency photocatalyst. In the TiO<2>/WO<3>/g-C<3>N<4> thoroughly mesoporenanofiber, TiO<2>/WO<3> is present in the form of nanofibers, the g-C<3>N<4> is supported by the TiO<2>/WO<3> nanofibers, wherein the TiO<2>/WO<3> nanofibers are in a porous structure including mesopores. The TiO<2>/ WO<3>/g-C<3>N<4> thoroughly mesoporenanofiber of the invention has a wide light responsive wavelength, good stability and high efficiency when used in the high efficiency photocatalyst.