54results about How to "High photocatalytic degradation rate" patented technology

The invention discloses a novel C3N4/ZnO/Fe2O3 composite photocatalyst and a preparation method thereof. The method comprises the following steps: preparing a carbon nitride (C3N4) catalyst and a ZnO/Fe2O3 catalyst, then mixing according to the proportion, grinding and preparing the C3N4/ZnO/Fe2O3 composite photocatalyst. The novel C3N4/ZnO/Fe2O3 composite photocatalyst has the advantages that the photocatalytic efficiency is high, photocatalysis can be carried out in the range of ultraviolet band and visible light wavelength, the application range is wider, high-efficiency degradation can be carried out on wastewater, especially pollutants in the dye wastewater, the degradation is thorough and the used time is short; the method is simple in operation, mild in reaction condition, does not use toxic and harmful substances as materials, and is green and environment-friendly, thus avoiding secondary pollution.

The invention discloses a preparation method of an activated carbon loaded and Zn2+/TiO2-doped photocatalyst, which comprises the following steps that: step 1: a certain amount (1 to 2.98g) of zinc nitrate is weighed, the zinc nitrate, 1.5ml distilled water and 2ml glacial acetic acid are added into 15ml absolute ethyl alcohol while being stirred, to form solution A; and step 2: 10ml tetrabutyl titanate is added into 30ml absolute ethyl alcohol while being intensively stirred, and stirred for a certain period of time (1 to 2h). After being stirred for a period of time, the solution A is slowly dripped into B, and continuously stirred for 30min. And then a certain amount of pre-treated activated carbon is intensively stirred for 1h, dipped for 12 to 72h, filtered, and washed by the absolute ethyl alcohol and deionized water for a plurality of times. The loaded activated carbon is dried for 2h at 120 DEG C, and calcined for 2h at 300 to 550 DEG C to prepare the activated carbon loaded and Zn2+/TiO2-doped photocatalyst. The photocatalytic degradation rate of the photocatalyst to gas-phase toluene can reach 92 percent, which is 1.3 times of that of a single TiO2/AC photocatalyst.

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 provides a preparation method of a modified bentonite sewage treatment material. The method includes the steps of: 1) adding tetrabutyl titanate to anhydrous ethanol, and adding glacial acetic acid to prepare a solution A; 2) adding a metal nitrate to deionized water and adding anhydrous ethanol and nitric acid to prepare a solution B; 3) adding bentonite to deionized water, and adding glacial acetic acid to prepare a suspension C; 4) slowly adding the solution B to the solution A to form a solution D, and slowly adding the solution D to the suspension C to form gel; 5) drying, grinding, washing, drying and thermal-treating the gel to obtain bentonite modified by TiO2; and 6) adding the bentonite modified by TiO2 to an organic cationic surfactant solution, filtering the mixture, and washing and drying the product to prepare the modified bentonite sewage treatment material. The modified bentonite sewage treatment material has strong adsorption and degradation capability on organic substances, heavy metal ions, nitrogen, phosphorus and the like.

The invention relates to preparation of a composite photocatalyst, and particularly relates to a photocatalytic material which is formed by loading a P25 type nano TiO2/V2O5 composite on foamed nickel having large specific surface area and has high catalytic degradation performance. The preparation method comprises the following steps: dissolving ammonium metavanadate in water, performing wet milling together with P25, impregnating, loading onto the foamed nickel, drying, and calcining at 500 DEG C for 1 hour, thus obtaining the foamed nickel loaded V2O5/P25 photocatalytic material. According to the invention, the preparation method is simple; no expensive equipment is required; the raw materials are low in price; the mechanical performance is favorable; and the photocatalytic degradation rate and visible light response range of the prepared catalyst are greatly improved in comparison with P25. When the composite photocatalyst is used for degrading harmful gas such as formaldehyde and the like in rooms and automobiles, the problems that the powdery photocatalyst is difficult to recover and regenerate after use and the like can be avoided.

The invention provides a photocatalyst CN-ZnO and a preparation method and application thereof. According to the photocatalyst CN-ZnO, nitrogen-containing organic matter and a zinc-containing compound serve as raw materials, and the photocatalyst containing graphite-phase carbon nitride (abbreviated as CN) and zinc oxide can be prepared through a hydrothermal method, is a composition and has a good catalytic degradation effect on organic dye and particularly azo type organic dye such as methyl orange under visible light.

The invention discloses a photocatalyst for degrading dye in wastewater and a preparing method thereof, and belongs to the field of photocatalysis. The photocatalyst for degrading the dye in the wastewater is characterized in that mesoporous silica serves as carriers, copper-element-doping nano-zinc oxide is loaded on the mesoporous silica carriers, the mass percent of zinc elements ranges from 5% to 40%, and the mass percent of the copper elements ranges from 0.1% to 5%. The photocatalyst for degrading the dye in the wastewater is used for catalytic degradation of methylene blue or rhodamine b, and is capable of achieving visible-light responses, low in cost, high in degradation efficiency and good in stability.

The invention discloses bismuth molybdate graphene aerogel compound and a preparation method thereof and belongs to the technical field of photocatalyst preparation. According to the bismuth molybdategraphene aerogel compound disclosed by the invention, graphene oxide is utilized as a raw material, hexaammonium molybdate tetrahydrate and anhydrous bismuth nitrate are utilized as raw materials forpreparing Bi2MoO6, and 3D Bi2MoO6/reduced graphene oxide aerogel compound can be finally obtained through solvent heat and freeze drying treatment. The life of an electron-hole pair of the synthesized 3D Bi2MoO6/reduced graphene oxide aerogel compound is longer, adsorption capacity of the synthesized 3D Bi2MoO6/reduced graphene oxide aerogel compound to organic pollutants and absorption capacityof the synthesized 3D Bi2MoO6/reduced graphene oxide aerogel compound to visible light are also enhanced, and catalytic degradation activity to the organic pollutants under the visible light is higher. A photodegradation rate of the 3D Bi2MoO6/reduced graphene oxide aerogel compound is 2.1 times of that of Bi2MoO6 and is 2.46 times of that of reduced graphene oxide aerogel, and the 3D Bi2MoO6/reduced graphene oxide aerogel compound has higher actual application value.

The invention discloses a preparation method of nano TiO2 thin-film material. The method comprises the following steps: firstly, preparing a pure titanium sheet into rectangular sheets of 25*15*2mm, secondly, pretreatment of the titanium sheet: sanding, degreasing, hydrochloric acidizing fluid rinsing, ultrasonic deionized water washing and vacuum drying, thirdly, laying the pretreated titanium sheet on micro-arc oxidation equipment, so as to be conducted to micro-arc oxidation, taking the titanium sheet as anode to be dipped into treating fluid and a stainless steel container with a cooling system as cathode, and fourthly, performing deionized water washing and drying to an obtained nano TiO2 thin-film, and then performing ion dipping to the thin-film, wherein experiment parameters are as follows: voltage is 420V, the preparation time is 30min, the content of Na3PO4 in a phosphate electrolyte system is 10g/L, the content of NaF is 1g/L, and the electrolyzing temperature is controlled to be below 35 DEG C. The method has the advantages that the photocatalytic degradation rate of the nano TiO2 thin-film exceeds 50 percent, the raw material is chip and common, the technology is simple, the cost is low, and the method is beneficial to industrial production.

The invention discloses carbon quantum dot/mesoporous layered titanium dioxide as well as a preparation method and application thereof, and belongs to the technical field of titanium dioxide preparation. Carbon quantum dots are prepared by a hydrothermal method, cetyltrimethylammonium bromide (CTAB) is used as a morphology control agent, mesoporous layered titanium dioxide powder (CTAB-TiO2) is prepared by a precipitation peptization method, and the carbon quantum dots and the CTAB-TiO2 are compounded to obtain the carbon quantum dot/mesoporous layered titanium dioxide (CQDs/CTAB-TiO2). The CQDs/CTAB-TiO2 can react with conjugated pi bonds formed by organic pollutants, the adsorption effect and photocatalytic performance on the organic pollutants are improved, the problems of complex preparation process and high energy consumption in traditional methods can be effectively solved, and the actual application range of titanium dioxide is further expanded.

The invention discloses a preparation method of a CaTi2O5tremella-like micro-nano structure photocatalyst, which comprises the steps of dissolving a titanium compound in an organic solvent, adding distilled water to form powder A, dissolving calcium chloride dihydrate in the distilled water, adding an organic solvent, stirring uniformly to form liquid B, adding the liquid B into the powder A, regulating a pH (potential of hydrogen) value of a system to 2-4, stirring and mixing, putting in a hydrothermal kettle for hydrothermal reaction, and washing a reaction product with the distilled water to form the CaTi2O5tremella-like micro-nano structure photocatalyst. In addition, the invention further discloses a product prepared by the preparation method. The method has a simple process route and low production cost, does not require a special device; the pure CaTi2O5tremella-like micro-nano structure photocatalyst with outstanding photocatalysis performance is obtained without a surfactant or a template; the yield and controllability are high; the product still keeps a higher photocatalytic degradation rate after multiple reuse and is easy to recover; and the use value and economic benefits of the product in the industrial circle are effectively improved.

The invention discloses a preparation method of a dye-sensitized metal sulfide semiconductor nanomaterial, belonging to the technical field of preparation of composite semiconductor materials. Aiming at the defects of the traditional hydrothermal method, an in-situ method and the like, the preparation method comprises the following steps of: introducing metal elements of a composite semiconductor into a hydrotalcite laminate according to adjustability and ion exchangeability of composition and structure of the hydrotalcite laminate; performing reversion; performing alkaline liquid etching; loading dye; and adjusting the molar ratio of the metal elements of the laminate to prepare the dye-sensitized porous ZnCdS composite semiconductor nanomaterial with modulated grain size, composition and band gap value and different Zn/Cd ratio. The prepared dye-sensitized composite semiconductor nanomaterial can optically degrade rhodamine-B molecules in the aqueous solution under the condition of visible light irradiation, thus representing high photocatalytic degradation ratio; and the photocatalytic degradation ratio can be regulated and controlled by adjusting the composition of the metal elements.

The invention relates to preparation of a composite photocatalyst and particularly relates to a composite photocatalyst loading P25 type nanometer TiO2-WO3 composite on nickel foam with a large specific surface area and having a good catalytic degradation effect. The preparation method comprises: dissolving ammonium tungstate in hot ammonia water, wet grinding the solution with P25, soaking and loading the product on nickel foam, drying the product at 100 DEG C, and calcining the product at 500 DEG C for 1 h to obtain a nickel foam loaded WO3/P25 photocatalytic material. The preparation method provided by the invention is simple, no expensive equipment is needed, the cost of the raw materials is low, the mechanical property is good; the photocatalytic degradation speed of the prepared catalyst is greatly improved compared with that of P25, and the prepared catalyst is used for degrading such harmful gases indoors or in automobiles as formaldehyde, and the like, and effectively solving the problems that a powdery photocatalyst is difficult to recycle and regenerate after being used.

The invention provides preparation and applications of a photocatalyst CNU-BA. According to the photocatalyst CNU-BA, a nitrogenous organic compound and barbituric acid are used as raw materials, andby means of impregnation and roasting, the photocatalyst CNU-BA is obtained. The photocatalyst CNU-BA has a good catalytic degradation effect on organic dyes, especially azo-organic dyes, such as methyl orange in visible light.

The invention relates to a preparation method of a titanium dioxide biomorphic material with high catalytic activity. The method comprises the following steps: preparing a diluted hydrochloric acid solution, adding a biomass raw material, carrying out suction filtration, repeatedly conducting cleaning with deionized water until a pH value is 7, and carrying out drying at 50-60 DEG C; dissolving tetrabutyl titanate into absolute ethyl alcohol, and adding acetylacetone; conducting stirring in a magnetic stirrer to obtain a mixed solution which is marked as a solution A; dissolving triethylamineinto absolute ethyl alcohol and marking the formed solution as a solution B; pouring the solution B into the solution A until the pH value of the mixed solution is adjusted to 7.5+/-0.5, and soaking abiomass raw material into a prepared alcoholic solution of TiO2; and carrying out drying and sintering, putting the biomass raw material impregnated with the TiO2 alcoholic solution into a muffle furnace, and carrying out sintering in the air to obtain the TiO2 biomorphic material. The method has the advantages of rich template materials, economy, environmental protection, simple process, diversetemplate compositions and structures and the like, and has important research significance.

The invention discloses a preparation method and application of a CuO/graphene composite material. The CuO/graphene composite material is successfully prepared from a copper salt and an environment-friendly reducing agent through one-step hydrothermal reduction, the specific surface area of the composite material is 150.1 m<2>/g, and the composite material shows excellent degradation performance on organic wastewater as a catalyst; and as a lithium ion negative electrode material, the composite material has relatively large reversible capacity and cycling stability, the first reversible capacity reaches 784.7 mAhg<-1>, and the retention rate after 50 cycles is 87.4%. The preparation method is simple, convenient to operate, low in cost and short in preparation period. The material can be used in the fields of supercapacitor electrode materials, lithium ion battery electrode materials, photosensitive materials, heterogeneous catalysis, photoelectrocatalysis, solar cells and the like.