51results about How to "Increase lattice defects" patented technology

The invention belongs to the field of the energy and chemical industry and particularly relates to a preparation method of a nanometer material using clay as a carrier and using a perovskite type compound as an active component and application of the nanometer material in photocatalytic degradation of antibiotics.Lanthanum nitrate, ferric nitrate, cerous nitrate, citric acid and the clay are added to deionized water and are mixed, then the mixture is transferred to a water bath kettle for evaporation to obtain wet gel, and drying, calcinations and dry grinding are performed to obtain the lanthanum ferrite / clay nano-structure composite material.The antibiotics are subjected to the photocatalytic degradation by adopting the composite material and can be rapidly degraded under visible light by utilizing the high catalytic activity of (cerium doped) lanthanum ferrite.The clay carrier facilitates antibiotic molecular adsorption in the antibiotic degradation process, the antibiotics are in contact with the lanthanum ferrite after being absorbed to the catalyst surface, and antibiotic molecules are decomposed under visible light irradiation to produce other active species.

The invention discloses a production method of a magnesium-doped hydroxyapatite defluorination filter material. The method comprises the steps of adopting industrial calcium salt, phosphoric acid, ammonia water and soluble magnesium salt as raw materials; mixing the soluble magnesium salt and calcium salt with determined addition quality into paste, and adding the paste to a reaction kettle for stirring evenly; preparing a phosphoric acid solution according to the volume ratio of the phosphoric acid to water; dropwise adding the solution to the reaction kettle and simultaneously dropwise adding ammonium hydroxide to the reaction kettle to keep the pH value of a reaction system within a set range in real time; and carrying out stirring, standing and ageing, taking out a product, filtering, drying and crushing to obtain a magnesium-doped hydroxyapatite powder filter material. Due to doping of a little of magnesium, the structure of hydroxyapatite can distort, lattice defects are increased, the crystallinity is reduced, the grain size is reduced, the specific surface area is increased, and the physical adsorption reaction of the surface is added, so that the magnesium-doped hydroxyapatite defluorination filter material plays a synergistic role in defluorination of the hydroxyapatite, and the defluorination capacity of a product is improved.

The invention discloses a preparation method of a high-performance nano W0.4Mo0.6O3 photocatalyst. The preparation method comprises the following steps: uniformly mixing a C6H12O6.H2O aqueous solution, a Na2WO4.2H2O aqueous solution and a Na2MoO4.2H2O aqueous solution to obtain a solution mixture, adding a polyoxyethylene alcohol ether aqueous solution into the solution mixture, uniformly stirring, regulating the pH value to 1-2, performing hydrothermal reaction at 120-180 DEG C for 5-15 hours, performing aftertreatment to obtain powder, and removing carbon from the powder, thereby obtaining the high-performance nano W0.4Mo0.6O3 photocatalyst. The nano W0.4Mo0.6O3 photocatalyst has a nano granule structure, and has large specific surface area, so that the contact area between the photocatalyst and organic dye is enlarged, and photo-catalytic reaction is facilitated. The preparation method is simple and convenient, and is easy to implement.

The invention belongs to the field of novel chemical materials and especially relates to a lanthanum cobaltate / attapulgite / reduced graphene oxide nano-structure composite material, a preparation method, and an application thereof. The preparation method includes the steps of: 1) preparing lanthanum cobaltate / attapulgite through a sol-gel process, adding the lanthanum cobaltate / attapulgite to deionized water and acidifying the liquid and regulating pH value to obtain a lanthanum cobaltate / attapulgite water solution carrying positive charges; 2) reducing graphite oxide with hydrazine hydrate to produce reduced graphene oxide carrying negative charges, and mixing the reduced graphene oxide with the lanthanum cobaltate / attapulgite water solution, stirring the mixture in water bath, performing a reaction, and drying a reaction product to obtain a perovskite / attapulgite / reduced graphene oxide composite material. With the composite material as a catalyst for performing photo-SCR denitration, conversion rate on NOx in a low-temperature zone (100-200 DEG C) can reach more than 95%.

The invention relates to a vanadium and palladium-codoped nanometer titania gas-sensitive material as well as a preparation method and applications thereof. The preparation method of the codoped nanometer titania gas-sensitive material comprises the steps of: taking nanometer titania as a matrix, and doping 0.5-1.5mol% of vanadium and 1.0-3.5mol% of palladium, mixing a Pd(NO3)2 solution with a vanadium triisopropoxy oxide alcohol solution and dropwise adding the mixture into a tetrabutyl titanate ethylene glycol solution to obtain gel, drying, grinding and calcining to obtain the vanadium and palladium-codoped nanometer titania gas-sensitive material, wherein the particle size of the vanadium and palladium-codoped nanometer titania ranges from 8 to 15nm. The invention further provides a preparation method of the material. The gas-sensitive material is used for a gas-sensitive sensor for detecting chlorobenzene, is high in sensitivity, good in selectivity, short in response-restoration time, and beneficial to realizing the fast detection of the chlorobenzene.

A preparation method of glass with the surface having a self-cleaning function film comprises the following steps: 1, preparing an aqueous solution of an inorganic salt; 2, preparing a titanium tetrachloride solution; 3, ingredient mixing: carrying out dispersion mixing of the aqueous solution of the inorganic salt prepared in step 1 and the organic solution of titanium tetrachloride prepared in step 2 to obtain an oil-water type liquid-liquid dispersion system; 4, injecting an adhesive to the surface of the base of glass; 5, carrying out heat treatment to form a film; and 6, carrying out air cooling to obtain the glass with the surface having the self-cleaning function film. The glass with the surface having the self-cleaning function film is used as a functional glass product used for solar photovoltaic batteries or electric light sources. The preparation method has the advantages of reasonable and convenient preparation technology, low production cost, safe and reliable preparation process, thorough reaction, good prepared product quality, high yield, and benefiting for the large-scale production. The preparation method provides conditions for the process industrialization, and the preparation method is simple, convenient and rapid.

The invention belongs to the technical field of composite materials, particularly relates to an oxygen-doped cobalt nickel phosphate-reduction oxygen graphene composite material, and further disclosesapplication of an electrode material of a supercapacitor. In the oxygen-doped cobalt nickel phosphate-reduction oxygen graphene composite material, an oxygen-doped cobalt nickel phosphate electrode material with small grain size and large specific area is effectively prepared by decomposition of sodium hypophosphite in medium and low temperatures, the surface potential is effectively adjusted bymodification, so that tight and uniform recombination with graphene oxide is achieved, the oxygen-doped cobalt nickel phosphate-reduction oxygen graphene composite material is prepared, the oxygen-doped cobalt nickel phosphate-reduction oxygen graphene composite material is richer in surface holes, smaller in grain size of active material and more excellent in electrochemical performance, excellent specific capacitance, charge-discharge cycle stability and rate performance are shown when the oxygen-doped cobalt nickel phosphate-reduction oxygen graphene composite material is used as the supercapacitor electrode material, and the specific capacitance and the charge-discharge cycle stability of the supercapacitor can be remarkably improved.

The invention relates to a lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as a preparation method and an application thereof. The material is prepared by the steps of: by taking nano-titanium dioxide as a matrix and the amount of titanium substances as a base number, doping 0.1-0.8 mol% of lanthanum and 0.1-0.8 mol% of yttrium, dripping ethanol solution of tetrabutyl titanate into the ethanol solution of lanthanum nitrate and yttrium nitrate by utilizing a sol-gel method to prepare sol, and drying, grinding and roasting the sol. The grain diameter of the obtained lanthanum-yttrium-codoped nano-titanium dioxide is 35-70 nm. The invention further provides the preparation method of the material. The obtained gas-sensitive material is used for producing gas-sensitive sensors for detecting o-chlorophenol, is high in sensitivity, good in selectivity and short in response time and is beneficial for realizing fast detection of the o-chlorophenol.