31results about How to "High photocatalytic degradation activity" patented technology

The invention discloses a magnetically recoverable neodymium complex / GO / Fe 3 o 4 Ternary compound and its preparation method and application. Preparation method: 1) prepare three-dimensional neodymium complex [Nd 2 (TCPB) 2 (DMF)(H 2 O)] n , 1; 2) Ultrasonic dispersion of complex 1 and graphene oxide (GO) in ethanol solution, reflux for 4 hours and add Fe 3 o 4 , sonicated for 1 hour, filtered, and collected to obtain the ternary complex 1 / GO / Fe 3 o 4 ‑x, where x represents the mass percentage of GO in the composite (x=5‑30%). Experiments show that 1 / GO / Fe 3 o 4 ‑9 has the best photocatalytic performance. It can rapidly catalyze and degrade methylene blue dye under light conditions. The degradation rate can reach 95% in 80 minutes, and it can be recycled in the range of pH=1~13. It is a good photocatalyst for degrading methylene blue dye. .

The invention provides a carbon-coated carbon nitride nanowire, a preparation method thereof and an application of photocatalytic degradation of bisphenol A. The preparation method comprises: adding polyethylene glycol-polypropylene glycol-polyethylene glycol tri-block copolymer into water, adding nitric acid under stirring conditions, and waiting for polyethylene glycol-polypropylene glycol-polyethylene glycol tri-block copolymerization After the substance dissolves, add dicyandiamide and continue to stir to obtain a mixed solution; move it to a reactor for hydrothermal reaction, and freeze-dry the product to obtain a carbon-coated carbon nitride nanowire precursor; carbon-coated nitrogen The precursor of carbonized carbon nanowires is calcined at high temperature to obtain carbon-coated carbon nitride nanowires. The carbon-coated carbon nitride nanowire has a three-dimensional network structure, and the diameter of the nanowire is 50-100 nm, which has strong mechanical strength; it is applied to photocatalytic degradation of bisphenol A, and has high photocatalytic degradation activity, which is different from simple Compared with carbon nitride, the specific surface area is significantly increased, the spectral response range is greatly expanded, and the degradation rate is significantly improved.

The invention provides a nano titanium dioxide photocatalyst with double-particle size distribution and a preparation method thereof. The method includes: dissolving an organic titanate in an alcohol solution, adding an aqueous solution of polyacrylic acid and polyvinylpyrrolidone dropwise under stirring to prepare a transparent titanium dioxide sol; then adding a commodity nano titanium dioxide powder and carrying out ultrasonic stirring to obtain titanium dioxide colloids from transparent to translucent; and finally conducting spray drying, thus obtaining the nano titanium dioxide photocatalyst with double-particle size distribution. The titanium dioxide photocatalyst prepared by the method provided by the invention has no need for adding any surfactant or dispersant during use, by water adding and stirring, a high-stability nano titanium dioxide photocatalyst spray solution can be prepared, and can be placed stably for more than 6 months. The catalyst provided by the invention has high activity on photocatalytic degradation of organic matters under sunlight, and the degradation rate is 40% higher than that the existing commodity nano titanium dioxide P25.

The invention discloses a to-dimensional titanium dioxide crystal form which has diffraction peaks at diffraction angles 2theta such as 8.78 degrees, 26.66 degrees, 38.80 degrees, 46.75 degrees and 58.07 degrees. The crystal form is of a three-dimensional nanosheet structure stacked by square single crystals; with a large specific surface area, the crystal form is particularly suitable for the preparation of composite materials; and the crystal form is strong in catalytic activity, has relatively high photocatalytic degradation activity for organic pollutants, excrement and the like, has a high degradation rate of 80.6% for methyl orange in three hours. Without doping, the crystal form is capable of enlarging light response range of titanium dioxide to a visible light area, thereby improving the product activity. According to the crystal form, the problem of acid-base pollution in the preparation process is solved; corrosive agents are not used in the preparation process, so that no secondary pollution is caused to the environment and the product stability is good; the crystal form still has relatively strong catalytic effect after being put at room temperature for 8 months; and the preparation process is simple and feasible and industrial production is easy to realize.

The invention relates to a nanometer composite, and particularly relates to a method for preparing a nanometer composite with a chrysanthemum structure. The method comprises the steps of adding titanium dioxide nanosheets into deionized water, carrying out ultrasonic dispersion, and obtaining a titanium dioxide dispersing liquid; under the condition of magnetic stirring, adding sodium molybdate and thioacetamide into the titanium dioxide dispersing liquid, and obtaining a mixed solution A; after finishing adding, stirring the mixed solution continuously, then transferring the mixed solution into a Teflon inner container, sealing the inner container in a stainless steel hydrothermal reaction kettle for hydrothermal reaction, after finishing the hydrothermal reaction, naturally cooling the reaction kettle to room temperature, centrifuging the obtained product, washing, vacuum drying and obtaining the composite. The method has the advantages that the source of raw materials is wide, and the method is simple and practicable and has low cost. The prepared titanium dioxide or molybdenum disulfide nanometer composite not only has good capacity in absorbing organic contaminants, but also has a good visible light photocatalytic degradation effect to organic contaminants.

The invention discloses a preparation method of a p-n junction type Cu:ZnO / N:rGO composite photocatalyst formed by Cu doped ZnO nanorods and N doped rGO. The Cu:ZnO / N:rGO composite photocatalyst is formed by coating the Cu doped p-type ZnO nanorods with the N doped n-type rGO. The preparation method comprises the following steps: the Cu doped ZnO nanorods are prepared with a hydrothermal method firstly; then the Cu doped ZnO nanorods and GO are assembled with a hydrothermal reduction method to form a Cu:ZnO / rGO composite photocatalyst; finally, Cu:ZnO / rGO is subjected to annealing treatment in NH3 atmosphere for N doping, and the Cu:ZnO / N:rGO composite photocatalyst is obtained. The Cu:ZnO / N:rGO composite photocatalyst prepared with the method has very high photocatalytic activity in ultraviolet light and can inhibit photo-corrosion of ZnO, the stability of the photocatalyst is improved greatly, and the photocatalyst has great potential application values in the field of sewage treatment.

The invention provides a FeTiO 2 Nanotube / g‑C 3 N 4 Composite material and its preparation method and application, the present invention has prepared Fe TiO with high photocatalytic activity at low cost with a simple process 2 Nanotube / g‑C 3 N 4 Composite materials, by controlling the reaction conditions, one-step preparation of homogeneous Fe‑TiO at lower hydrothermal temperature 2 nanotubes, by controlling the TiO 2 FeTiO with controllable tube length and tube diameter can be obtained 2 Uniform nanotubes; and the preparation of composite materials avoids high-temperature heating, and Fe-TiO 2 Nanotubes and g‑C 3 N 4 The composite material can effectively degrade the refractory toxic pollutants in sewage, and also has a good hydrogen production effect, and has a good application prospect in the fields of sewage treatment and energy.

The invention discloses an environment-friendly interior wall coating with waste generated during production of optical fibers as a base material. The environment-friendly interior wall coating is prepared from, by weight, 40-50 parts of pretreated optical fiber performing bar waste powder, 15-20 parts of quartz sand, 12-15 parts of wollastonite powder, 10-15 parts of dispersible latex powder, 1.5-2.5 parts of nanometer titania, 2-3 parts of starch ether and 8-15 parts of titanium oxide pigment, wherein the optical fiber performing bar waste powder is calcined for 20-60 min at 500-700 DEG C tobe pretreated, and TiO2 with visible-light photocatalytic activity is adopted for nanometer titania. The environment-friendly interior wall coating has the advantages of being capable of purifying air, good in paint film performance, small in construction difficulty and the like, and the problems that the environment is polluted when optical fiber waste is thrown about and an interior wall coating does not have functionality and environment protection performance simultaneously are greatly solved.