968 results about "Methyl orange" patented technology

The invention discloses a composite visible light catalyst of a g-C3N4 / bismuth-based oxide and a preparation method and an application of the composite visible light catalyst. Carbon nitride in the composite light catalyst is graphite-phase carbon nitride; and the bismuth-based oxide is more than one of Bi2O2CO3, BiOBr, BiOCl, Bi2WO6, BiVO4 and BiOI. The components of the obtained composite catalyst are tight in contact, so that separation of photo electron-hole pairs is facilitated, and the photocatalytic efficiency is also improved; the composite catalyst has good degradation efficiency on organic pollutants represented by methyl orange under sunlight illumination; the preparation method disclosed by the invention has the characteristics of being simple in process, simple and convenient to operate, and cheap in raw materials; the prepared composite catalyst can be widely applied to waste water treatment, atmospheric purification and the like; and a new concept is provided for design of the novel composite visible light catalyst by the preparation method.

The invention discloses a g-C3N4 nanosheet / CdS composite visible-light-driven photocatalyst and a preparing method and application thereof and belongs to the technical field of material preparation and photocatalysis. The catalyst is directly obtained with the solvothermal method by taking two-dimensional ultra-thin g-C3N4 nanosheets as the matrix, cadmium acetate dihydrate and thioacetamide as raw materials, and ethyl alcohol as the solvent. Compared with general block g-C3N4 / CdS, the two-dimensional ultra-thin g-C3N4 nanosheet / CdS composite photocatalyst prepared with the method has the advantages that the two substances are in tighter contact, the specific surface area is larger, photon-generated electron-hole can be better separated, and photocatalytic efficiency is higher. Under the shining of sunlight, the composite photocatalyst enables catalytic degradation of organic pollutants such as methyl orange in water to be achieved well. The preparing method is easy, raw materials are easy to obtain, visible light catalysis efficiency is high, and the application prospect is wide in the photocatalysis field.

The present invention relates to the development of water purifying compositions based on magnetic nanoparticles decorated activated carbon nanocomposites which display both magnetic character as well as adsorbent characteristics. The addition of adsorbent to impure water containing dye as pollutant enables the fast adsorption of dye leading to discoloration of water whereas magnetic properties facilitates the rapid isolation of pollutant adsorbed nanocomposites powder from the purified water with the aid of a magnet. The present invention also provides a process for the development of such multifunctional adsorbent using a process which enables decoration of adsorbent with 5-50 weight % of magnetic nanoparticles, the enables the realization of magnetic adsorbent having saturation magnetization in the range 0.09 to 28.3 emu / g, dye removal efficiency of >99%, rapid decolourization of methylene blue (MB) / methyl orange (MO) dye polluted water in less than 1 min, magnetic separation time in the range <0.2 to 60 min and dye sorption capacity in the range of 3.3×10−4 to 116.3×10−4 mol of MB and 3.6×10−4 to 148.6×10−4 mol of MO dye per 100 gram of nanocomposite powder in a rapid adsorption (<1 min) and magnetic separation process. Besides, these nanocomposites could also be useful for other of applications e.g. as separation of catalytic residues from the products, for removal of oil from water, filler for development of thermally / electrically conducting magneto-rheological fluids or for handling of electromagnetic pollution.

The invention discloses a preparation method of a chitosan / titanium dioxide composite material. The chitosan is dissolved in colloid titanium dioxide solution containing acetic acid or the chitosan is blended with the colloid titanium dioxide after being dissolved by the acetic acid, by stirring, the dioxide is homogeneously dispersed in TiO2 colloid solution, and homogeneous chitosan / TiO2 mixed solution is prepared. The mass weight percentage of the chitosan in the mixed solution is 1 to 10 percent, and the mass weight percentage of TiO2 is 0.5 to 20 percent; the chitosan / titanium dioxide composite material is consolidated and prepared after the mixed solution is degassed. The compound membrane prepared by the method is transparent or semitransparent. The preparation method of the invention is simple, the raw material is inexpensive, the material source is abundant, and TiO2 is distributed in the compound material at nano-size. The prepared product has wide application range, and has photocatalysis degradation characteristic on waste water of helianthine and other dye, etc. The composite material can be taken as an indoor air purifying agent, an industrial waste water treating agent, an antibacterial film, self-cleaning fiber and antibacterial fiber, etc.

A magnetic composite nano-TiO2 photocatalyst able to be recovered magnetically is prepared by sol-gel method. It is composed of Fe3O4 as core, SiO2 as isolating layer and TiO2 as coated layer. It has excellent soft magnetic property, high photocatalyst activity, and high degradability to methyl orange.

The invention relates to a preparation method of a titanium dioxide / graphene composite photocatalyst. The invention is to solve the technical problems that titanium dioxide in a titanium dioxide / graphene compound prepared by the traditional method has a large particle size and low photocatalytic efficiency. The preparation method comprises the following steps that: tetrabutyl titanate is added to a graphene oxide dispersion solution, a concentrated acid is added to adjust the acidity after ultrasonic dispersion, and then deionized water is added to continue to carry out ultrasonic treatment to obtain sol; and then the sol is transferred to a hydrothermal reaction kettle to be subjected to hydrothermal reaction, and then is washed and dried to obtain the titanium dioxide / graphene composite photocatalyst. The particle size of the titanium dioxide in the composite photocatalyst provided by the invention is 5 to 10nm, and the composite photocatalyst can be used for visible light catalytic degradation of methyl orange, and the catalytic efficiency can reach 75% within 2 hours. The titanium dioxide / graphene composite material provided by the invention can be used as a photocatalytic material, a solar cell material and a lithium ion battery cathode material.

The invention discloses a method for degrading organic waste water by photo-assisted activation of potassium hydrogen persulfate through bismuth ferrite, belonging to the technical field of waste water treatment. A perovskite structure BiFeO3 in the invention has a spherical morphology and is prepared by adding a certain amount of a surface active agent under hydrothermal conditions; the specific surface area is high; and the prepared BiFeO3 self can degrade organic pollutants by photocatalysis under the irradiation of visible light. According to the method disclosed by the invention, BiFeO3 is applied to degrading the organic pollutants by activating potassium hydrogen persulfate; the methyl orange degradation rate within 15 min is 94%; the methyl blue degradation rate within 40 min is 90%; the rhodamine degradation rate within 40 min is 65%; by means of combined use of BiFeO3 and potassium hydrogen persulfate, the organic pollutants are oxidized and degraded; the organic pollutants can be effectively degraded under better illumination conditions; the organic pollutants can also be effectively oxidized and degraded without light or under poor illumination conditions; and therefore, the method has good application prospect.

The invention discloses a method for degrading methyl orange dye wastewater with a ZnIn2S4 visible light catalyst. The method comprises the following steps: using zinc salt, indium salt and sulfur source as reaction materials; dissolving the materials in a de-ionized water solution according to a stoichiometric ratio; starting a hydrothermal reaction at the temperature of 30-90 DEG C to obtain ZnIn2S4 visible light catalyst powders; moving the prepared methyl orange solution into a self-prepared glass reaction vessel; adding the prepared ZnIn2S4 powders; placing the reaction system in a dark room and stirring for 20-60 minutes in dark; stirring for 1-4 hours under visible light; and determining that the methyl orange is fully degraded after being separated by high speed centrifugation. By using the method provided by the invention, the methyl orange solution can be degraded efficiently at room temperature and under normal pressure, conditions of the degradation process in the method can be easily controlled, the process is simple and is easy to learn and operate, the time required for complete degradation is short, and the energy consumption is low.

The invention discloses a method for degrading organic dye through a metal organic framework film based on metalloporphyrin. The method is characterized in that the porphyrin metal organic framework film is generated on the surface of a transparent glass sheet and placed on a net-shaped support to be hung in an organic dye solution, and irradiation is performed for 1-4 h with the visible light intensity of 300 W at indoor temperature so that the organic dye solution can be degraded to the concentration at which the organic dye solution can be discharged. The preparation process of the metal organic framework film based on metalloporphyrin is characterized in that the transparent glass sheet pretreated with 3-APTMS is reacted with (4-carboxyphenyl)manganese(iron / cobalt)porphyrin, a solution containing Zn2+ and 2,2'-dimethyl-4,4'-bipyridine in a steeping mode, a product is washed with solvent after one time of steeping circulation is completed, the steeping step is repeated, and the thickness of the film is controlled by the number of steeping circulation times, so that the oriented, ordered and porous porphyrin metal organic framework film is prepared. According to the method, the metal organic framework film is used for performing light degradation on a single or mixed solution formed by methylene blue, methyl orange and rhodamine, is good in catalytic effect and convenient to recycle, and is a replaceable good novel material used for degrading organic dye.

The invention provides photocatalytic powder capable of being applied to environment purifying and atmospheric pollutant governing. Each titanium dioxide particle is wrapped by a hydroxyl apatite layer, and holes with controllable size are formed in the hydroxyl apatite layer, so that target products such as formaldehyde and benzene are selectively degraded, and other larger molecules such as methyl orange are not damaged. The photocatalytic chemical powder can be extensively applied to various organic polymer setting products, especially organic fibers, plastic products or paint.

The invention discloses a visible-light-induced photocatalyst Bi4O5Br2 and a preparation method thereof. According to the visible-light-induced photocatalyst Bi4O5Br2 and the preparation method thereof, an improved low-temperature hydrothermal method is adopted, composition of Bi, O and Br in BiOX is controlled by controlling amount of a bismuth source and a bromine source, and a novel layered-cake-shaped visible-light-induced photocatalyst Bi4O5Br2 is prepared successfully. The preparation method is simple in production process, easy to operate, low in synthesis temperature, high in reaction yield, environment-friendly and low in cost and meets the requirement of actual production, the reaction yield is 92%, and raw materials are easy to obtain. The visible-light-induced photocatalyst has good visible-light catalytic activity, can completely degrade various organic pollutants such as rhodamine b, methyl orange and methylene blue in short time under the visible light irradiation, is small in light corrosion and good in reusability, can be applied to industrial production and particularly has a better application value in organic pollutant degradation through solar photocatalysis, and the market potential is large.

The invention relates to a synthesis method of a novel visible-light photocatalyst indium sulfide, belonging to the technical field of preparation of photocatalysts. The method comprises the following steps: weighing indium chloride tetrahydrate, dissolving the indium chloride tetrahydrate in deionized water, adding acetic acid to regulate the pH value to 1-3, and adding thioacetamide solution, wherein the concentration of indium ions is 0.025 mol / L, and the In / S mol ratio is 1:4-1:10; heating the obtained mixed solution to constant temperature so as to carry out hydrothermal reaction for 4-8 hours while regulating the temperature to 80 DEG C, and cooling at room temperature; and carrying out vacuum filtration under reduced pressure, washing, and drying to obtain the orange indium sulfide powder. The indium sulfide prepared by the method provided by the invention is in a ball-flower shape, and has the advantages of large specific area and uniform size; and the indium sulfide powder is in a cubic structure. The indium sulfide can be used as a visible-light photocatalyst, and has good degradation effect on organic dyes (such as methyl orange).

The invention discloses a graphene-doped and lanthanum-modified titanium-based lead dioxide electrode which comprises a titanium base body, a tin-antimony oxide bottom layer deposited on the titanium base body in a hydrothermal mode, graphene deposited on the tin-antimony oxide bottom layer in an electrolytic mode, and a lanthanum-modified beta-PbO2 active layer. Compared with the prior art, the titanium-based lead dioxide electrode at least can improve removal effect of methyl orange by 15.6% in case of keeping service life of the titanium-based lead dioxide electrode. The invention further discloses a preparation method for the titanium-based lead dioxide electrode. The preparation method comprises the following step: depositing the beta-PbO2 active layer in an acidic deposition liquid by taking the titanium base body which is deposited with the tin-antimony oxide bottom layer in the hydrothermal mode as an anode and taking equal-area graphite as a cathode, wherein the acidic deposition liquid comprises graphene, lanthanum nitrate, lead, nitrate, nitric acid and a surfactant. According to the preparation method, a preparation process for an alpha-PbO2 layer is cancelled, the preparation method for the titanium-based lead dioxide electrode is simplified, and foundation is laid for increasing a finished product qualified rate of an electrode product.

The invention relates to a method for preparing a crosslinked-chitosan-system azo dye wastewater adsorbent. According to the method, the chitosan microsphere adsorbent aiming at azo dye wastewater treatment is prepared by carrying out reversed phase emulsification process and a cross-linking reaction on a microfluidic focusing type chip made from a laboratory-made polymethyl methacrylate (PMMA) material; the chitosan adsorbent prepared by virtue of the method belongs to a micron scale; compared with adsorbents at present, the chitosan adsorbent has the advantages that the specific surface area is larger, the degree of sphericity and the monodispersity are higher, the biocompatibility and the reproducibility of the chitosan adsorbent are guaranteed by virtue of a chitosan matrix, and the dissolving resistance and the swelling resistance of the chitosan adsorbent are improved under acid conditions when relatively high template dye adsorption capacity is guaranteed in a crosslinking process; by testing template dye wastewater methyl orange, the maximal adsorption capacity can reach 65.83mg / g.

The invention provides a nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and a preparation method thereof. The nano-mesoporous micro-spherical photocatalyst is 15-30 nm in surface mesopore diameter, is 1-5 [mu]m in average particle size and has an orthorhombic crystal form, wherein nBi + Ln : nI = 0.85-1:1, and nLn : nBi = 0.01-0.055:1. The preparation method includes the steps of: dissolving a bismuth salt, an iodine salt and nitrate containing rare earth ions respectively in certain-quantity ethylene glycol, performing ultrasonic oscillation, adding the rare earth ion solution to the bismuth-containing solution, adding the iodine-containing solution, and performing magnetic stirring to form a precursor Ln-BiOI; performing a hydrothermal reaction to the precursor to prepare Ln-BiOI powder; and maintaining the temperature of the Ln-BiOI at 425-525 DEG C to prepare the Ln-Bi5O7I powder. The Ln-Bi5O7I photocatalyst has homogeneous appearance, has large specific surface area, is strong in stability and has excellent photocatalytic performance in degradation of rhodamine B, methyl orange, phenol, bisphenol A and the like. The method combines advantages of both hydrothermal and thermal-decomposition methods.

The invention discloses a dried persimmon-shaped visible-light-driven photocatalyst BiOBr and a preparation method thereof. The inventor adopts a low-temperature solvothermal method, controls the morphology of a halogen-bismuth-oxide visible-light-driven photocatalyst by controlling the dosage of a bismuth source and a bromine source and adding a structure guiding agent, and successfully prepares the novel efficient visible-light-driven photocatalyst BiOBr with novel and special morphology, the dried persimmon shape, for the first time. The preparation method disclosed by the invention is simple in overall production technology, easy to operate, low in synthesis temperature, high in reaction yield (89%), friendly to environment and low in cost, and accords with the requirements of practical production, and the raw materials are readily available. The visible-light-driven photocatalyst disclosed by the invention has good visible-light catalytic activity, can completely degrade a plurality of organic pollutants (such as methylthionine chloride and methyl orange) within a short period of time under irradiation of visible light, is small in light corrosivity, good in reusability and large in market potential, can be applied to industrial production, and especially has good application value in photocatalytic decomposition of organic pollutants by solar energy.

The present invention provides a g-CNQDs / GO composite photocatalysis material preparation method. The concrete scheme of the method comprises that graphite powder, urea and concentrated nitric acid are used as main raw materials, an electrostatic coupling method is used, and four steps such as oxidation of graphene, oxidation of graphite phase carbon nitride quantum dots, oxidation of protonated graphite phase carbon nitride quantum dots, and g-CNQDs / GO compounding are performed to prepare the graphite phase carbon nitride quantum dot / graphene oxide composite photocatalysis material. According to the present invention, the photocatalytic property test on the prepared composite photocatalysis material is performed with visible light ([lambda] is more than 420 nm), and the results of the degradation on rhodamine B, methyl orange and other organic dyes show that the composite photocatalyis material has the excellent photocatalytic performance under the visible light.

The present invention discloses a highly active visible catalyst Ag / Cu2O hierarchy structural microsphere preparation method which comprises the following steps: accurately trihydrate copper nitrate, silver nitrate and polyvinylpyrrolidone are weighed and dispersed in a container containing ethylene glycol, and are fully dissolved under magnetic stirring action to form a clear transparent blue solution; the resulting solution is transferred to an autoclave for heating at constant temperature, and the solution is cooled to room temperature after completion of the reaction; an autoclave bottom black precipitated product is taken out, and washed with deionized water ethanol to obtain black solid powder, and the black solid powder is placed in a vacuum drying oven and dried to constant weight. A simple green solvent thermal method is used, the method is easy to operate, free of impurities, available in raw materials, low in cost, low in reaction temperature, and almost free of pollution, the product is easy to separate, high in purity, uniform in morphology, methyl orange dye molecule degradation rate within 40min is more than 98%, and after recycling for five times, the degradation rate is kept more than 95%.

The invention provides a transition metal oxide composite CNB photocatalyst. The photocatalyst is formed by compositing CNB and a transition metal oxide with carbon, has good photocatalytic degradation effect on organic dyes, especially azo dyes or anthraquinone dyes, under ultraviolet light, and has the degradation rate on methyl orange reaching more than or equal to 75% especially after being radiated in the ultraviolet light for 1 h. The invention also provides a preparation method for the photocatalyst; the method comprises the steps of preparing CNB by doping a boron element in graphite-phase carbon nitride and then composting the CNB with the transition metal oxide, to prepare the composite photocatalyst; the method is simple and feasible to implement; the yield of preparation of the photocatalyst is high.

The invention discloses a method for preparing a porous tourmaline slab with photocatalytic performance. Tourmaline, quartz, feldspar, kaolin and glass powder are used as raw materials; and sawdust or coconut shells is / are used as a pore forming agent. The method comprises the following steps of: performing dry pressing, drying, sintering at the temperature of between 650 and 750 DEG C to form a porous tourmaline base slab, coating nano TiO2 sol prepared by titanium alkoxide hydrolysis on the porous tourmaline base slab by adopting a vacuum impregnation method, roasting, and thus obtaining the nano TiO2 supported porous tourmaline slab. The method solves the problems that nano TiO2 powder is fine and difficult to separate and reclaim and the like; and the porous tourmaline slab has high specific surface area, efficient photocatalytic property and negative ion release property. The photocatalytic property is tested by adopting degradable methyl orange, namely the nano TiO2 supported porous tourmaline slab and nano TiO2 microspheres are respectively put into 50 milliliters of 10mg / L methyl orange solution, irradiated for 4 hours by using an ultraviolet lamp and then separated, and the absorbance of the porous tourmaline slab and the nano TiO2 microspheres is tested. By calculating the degradation rate of the methyl orange, the nano TiO2 supported porous tourmaline slab has high degradation property on the methyl orange, and the degradation property is nearly improved by 40 percent compared with the nano TiO2 microspheres.

The invention relates to a preparation method of a core-shell structure visible-light-driven photocatalyst. The preparation method provided by the invention comprises the following steps: firstly, preparing an MOF (Metal-Organic Framework) UiO-66 with a morphology of a regular octahedron; then reducing elemental sulfur to be S2-ion by using the weak reducing effect of lauryl amine through a hydrothermal method, and using sodium lignin sulfonate as a coating agent for UiO-66, so as to enable formed In2S3 nano-particles to be evenly loaded on the surface of the UiO-66 to obtain the core-shell structure visible-light-driven photocatalyst taking UiO-66 as a core and In2S3 as a shell. The visible-light-driven photocatalyst prepared by the invention is excellent in stability, high in adsorptionand catalytic efficiencies, has a relatively good degradating effect on organic dyestuff, and can degrade 97 percent of MO (methyl orange) within 60 min under visible light irradiation, and the visible-light-driven photocatalyst is expected to be in large-scale application in the field of photocatalytic degradation for organic dyestuff, antibiotics and the like.

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 preparation method of a solid acid Fenton catalyst for processing methyl orange waste water, comprising the following steps: a, using granular starch, glucose or beta-cyclodextrin as raw material, adding concentrated sulfuric acid for carbonization at the temperature of 120 DEG C; b, cooling the carbonized material to room temperature, then washing; c, drying and grinding; d, adding active components for dipping, then washing; e, drying the obtained solid for 8-10h at the temperature of 110 DEG C; and f, after drying, roasting at the temperature of 300-700 DEG C, cooling to room temperature to obtain the corresponding solid acid heterogeneous Fenton catalyst. The prepared catalyst solves the problems of loss of active components, large liquid acid consumption, low utilization rate of H2O2, equipment corrosion, environmental pollution seriously and the like in traditional heterogeneous Fenton catalytic oxidation process, and is a green and high effective organic substance degraded Fenton catalyst.

The invention relates to modified graphene for efficiently adsorbing methyl orange dye. According to the modified graphene, water-soluble chitosan quaternary ammonium salt is grafted to the surface of graphene oxide by using the electrostatic function of a non-covalent bond, the graphene oxide is reduced by using a chemical reduction method, and meanwhile the chitosan quaternary ammonium salt is retained on the surface of graphene; specifically, the modified graphene is prepared by firstly, ultrasonically dispersing graphene oxide into sodium hydroxide solution so as to obtain a graphene oxide dispersion liquid, subsequently adding into a chitosan quaternary ammonium salt solution, and mixing and stirring; adjusting the pH value of the mixed liquid by using the sodium hydroxide solution, adding a reducing agent hydrazine hydrate, and heating to obtain black flocculent precipitate, performing suction filtration, washing and drying. The modified graphene provided by the invention is good in dispersity in water, with the combination of the electrostatic function of the chitosan quaternary ammonium salt and the synergistic effect of the large specific surface area of graphene, methyl orange in a solution can be effectively removed, the adsorption property is high, the adsorption is stable, and the dye wastewater treatment efficiency is improved.

The invention discloses a method for degrading methyl orange by use of perovskite / polysaccharide composite photocatalyst. The method comprises the following steps: preparing perovskite by utilizing nitrate of La, Cu and Fe, adding the perovskite and chitosan into an acetic acid solution, and performing ultrasonic treatment; drying to form a film to obtain a perovskite / chitosan composite photocatalyst; or adding xylan into distilled water, adding sodium hypophosphite and citric acid solution, adding perovskite, performing ultrasonic treatment, dehydrating, crosslinking to form a film, and washing with ethanol to obtain a perovskite / xylan composite photocatalyst; adding the composite photocatalytic material into the methyl orange solution, respectively reacting for 470-490 minutes at normal temperature in ultraviolet radiation. The polysaccharide used in the method is formed by compounding the catalyst and polysaccharide respectively with chitosan and xylan, the methyl orange photocatlytic degrading capability of the polysaccharide can be improved. The polysaccharide has the advantages of high catalytic efficiency, strong photo-response performance, regeneration, recycling and the like.

The invention relates to a Bi2MoO6-ZnO composite photocatalyst and a preparation method thereof. The method mainly comprises the steps as follows: taking zinc acetate, bismuth nitrate and sodium molybdate in a certain proportion as raw materials, evenly mixing the materials through mechanical stirring in a certain order, adjusting the pH value of a solution, and then further preparing the Bi2MoO6-ZnO composite photocatalyst through a hydrothermal reaction. The Bi2MoO6-ZnO composite photocatalyst has the benefits as follows: the obtained composite visible-light-induced photocatalyst is formed by composition of Bi2MoO6 and ZnO, and the composite visible-light-induced photocatalyst has better absorption performance in ultraviolet-visible light regions with the wave length in a range of 320-580 nm; methyl orange has the good photocatalytic degradation effect under exposure to ultraviolet-visible light, the degradation rate exceeds 90% after 60 min, then the degradation effect tends to be gentle, and the total degradation rate of the methyl orange is 95% after 2 h.

The invention provides a method for preparing visible light-induced high catalysis activity tin-doping nanometer titanium oxide photo-catalyst, belonging to the photo-catalyst material technique. It comprises following steps: first preparing tin-doping TiO2 sol; then, preparing tin-doping TiO2 film. The invention comprises the advantages that the prepared nanometer TiO2 film doping with Sn4+ has the duplex grain structure between anatase and red schorl; the average size of crystal grain ranges between 25-30nm, while the red schorl is formed by solid solving the Sn4+ into TiO2 crystal lattice; the surface of transparent film is smooth with a certain coarseness; the absorption band to incident light of TiO2 photo-catalyst film is removed to visible light band by doping Sn4+ to improve the visible light-induced photo-catalyst. The photo-catalyst activity is presented as the photo-catalyst degradation rate of helianthin and doping Sn4+ in right amount can effectively improve the photo-catalyst activity of TiO2 film, while compared with absolute nanometer TiO2 film, its photo-catalyst degradation rate of helianthin is improved more than 34%.

The invention discloses a synthesis method of a graphite phase carbonitride homotype heterojunction photocatalysis material with a multilayer structure. The method comprises the following steps of preparing a melamine / cyanuric acid suspension and urea water solution; performing preparation by using the melamine / cyanuric acid suspension to obtain melamine / cyanuric acid suspension macromolecular crystals completing the assembly reaction; adding the melamine / cyanuric acid suspension macromolecular crystals into the urea water solution; performing calcination on the urea-(melamine / cyanuric acid) composite precursor obtained through preparation to obtain the graphite phase carbon nitride (g-C3N4) homotype heterojunction photocatalysis material with multilayer structures with g-C3N4 nanometer particles deposited on the g-C3N4 micrometer tubes. The synthesis method provided by the invention has the advantages that the conditions are mild; the preparation process is simple and convenient; the controllability is high; the obtained photocatalysis material can be applied to methyl orange degradation in visible light; the effect is obvious.

The invention relates to a Ti<3+> and carbon codoped TiO2 photocatalyst with visible-light activity and a preparation method of the TiO2 photocatalyst. The structure of the catalyst is: partial Ti<4+> in TiO2 bulk phase lattice is reduced to Ti<3+> (the self doping amount of Ti<3+> is about 0.01at% to 0.3at%); and at the same time, ethanol is bonded on the surface of TiO2 in the form of graphite (the mass percentage between the carbon and TiO2 is 80.43% to 97.04%). Various characterization means find that the carbon doping is mainly compounded on the surface of TiO2 in the form of graphite and bonded on the surface of TiO2 in the way of Ti-O-C. The catalyst coproduced and modified by Ti<3+> and the carbon shows high activity of visible light degraded methyl orange. The doping level formed by Ti<3+> and oxygen vacancy can improve the response range of TiO2 to the visible light, and the graphite compounded on the surface of the catalyst can improve the migration efficiency of photogenerated electrons and confirm that the cooperation between Ti<3+> and the graphite carbon on the surface can promote the visible light catalytic activity of the catalyst to be improved. The preparation method is relatively simple in operation and readily available in raw materials, and the prepared modified photocatalyst is strong in function.