38results about How to "Firmly loaded" patented technology

The invention belongs to the field of photocatalytic materials, and discloses an immobilized F, N and Ag co-doped titanium dioxide photocatalyst and a preparation method and application thereof. The preparation method of the photocatalyst comprises the following steps: (1) soaking the photocatalyst carrier in an acidic solution, then taking out, washing, drying and calcining for use; (2) mixing the titanium dioxide precursor and anhydrous ethanol uniformly, Add hydrolysis inhibitor dropwise under stirring, then add ammonium fluoride solution and silver nitrate solution to obtain a mixed solution; (3) immerse the photocatalyst carrier obtained in step (1) after calcining at high temperature in step (2) After the reaction is completed, the photocatalyst carrier in the hydrothermal reactor is taken out, washed and dried to obtain the immobilized photocatalyst. Compared with pure titanium dioxide, the obtained catalyst has obviously enhanced photocatalytic performance, the catalyst is firmly supported and not easy to fall off; and the preparation process of the invention is simple and the repeatability is good.

The invention relates to a multifunctional antibacterial compound preparation and its application, relating to an antibacterial compound preparation containing silver and zinc ions and its application, in particular to an antibacterial compound preparation containing silver-loaded zinc nano-zeolite and tourmaline and its application . The purpose is to provide a multifunctional antibacterial compound preparation with good antibacterial effect, low cost and firm immobilization of silver and zinc ions and its application. The invention is a multifunctional antibacterial compound preparation, which comprises silver-loaded zinc nanometer zeolite powder and tourmaline superfine powder. The multifunctional antibacterial composite preparation of the present invention has the functions of anti-radiation, antibacterial, and deodorization, and each component therein complements each other and synergizes with antibacterial effect, and the antibacterial composite preparation of the present invention is used to prepare antibacterial fabrics, which can effectively kill bacteria on the fabrics. Harmful bacteria can avoid the spread of diseases, and because the compound preparation is safe, non-toxic, and stable, it can well meet the requirements of practical applications. The invention is applied in the field of preparation of antibacterial products.

The invention discloses a preparation method for a porous biomimetic catalytic material and application thereof. The preparation method comprises the following steps of dissolving chitosan into acetic acid solution, stirring and dropwise adding ammonia water until the pH value is between 6.5 and 7; adding 4-(p-carboxy phenyl) metalloporphyrin ethanol solution, stirring for 24 h, and then adding NH4HCO3 solution, and uniformly stirring; drying by an infrared lamp, and performing vacuum drying to obtain the porous biomimetic catalytic material. The porous biomimetic catalytic material comprises the following components in part by weight 17.6 parts of chitosan, 8.78 parts of glacial acetic acid, 0.0878 part of ammonia water, 0.0176 part of metalloporphyrin, 43.9 parts of ammonium bicarbonate, 500 parts of distilled water and 100 parts of ethanol. Compared with the metalloporphyrin homogeneous catalytic material, the porous biomimetic catalytic material has the advantages that the metalloporphyrin is less in using amount and lower in cost and is easier to separate. The porous biomimetic catalytic material can obviously improve the one-way conversion rate of cyclohexane and the yield of main products and can be reused at least seven times, the average conversion rate of the cyclohexane is between 15.2 and 17.0 percent, and the average conversion rate of ketone alcohol is between 10.9 and 12.7 percent.

The invention discloses a nitrogen and sulfur codoped silica gel supported TiO2 photocatalyst and a preparation method thereof. The method comprises the steps: preparing sol by taking tetraethoxysilane and butyl titanate as precursor raw materials for supporting TiO2 and taking mixed acid of sulfuric acid and nitric acid as a nitrogen and sulfur doped source and an initiator for sol-gel reaction; standing in constant-temperature water bath or standing at room temperature for ageing to prepare a silicon-titanium copolymer containing sulfate radical and nitrate radical; sintering under nitrogen atmosphere to prepare the nitrogen and sulfur codoped silica gel supported TiO2 photocatalyst. The photocatalyst prepared by the method has high purity and crystallinity; nitrogen and sulfur codoped TiO2 crystal particles are positioned in a silica gel mesoporous framework structure, so N and S are effectively codoped, the photoresponse range of the TiO2 photocatalyst is widened, and the aims of photocatalytic red shift and sunlight efficient utilization are fulfilled.

The invention discloses an anticoagulant modification method of a hemodialyzer and an application thereof. The anticoagulant modification method of the hemodialyzer comprises: in a protective atmosphere, polymerizing a uniformly mixed reaction system comprising an alkenoic acid monomer, a sodium sulfonate monomer, a crosslinking agent monomer, an initiator and water Cross-linking reaction to obtain an active heparin-like aqueous solution; contacting the inner surface of the membrane filament of the hemodialyzer with the active heparin-like aqueous solution, followed by separation; Obtain a hemodialyzer with high anticoagulant performance. The hemodialyzer prepared by the present invention has excellent hemocompatibility and high anticoagulant performance, and the anticoagulant modification technology is based on a water-based system throughout, and only necessary heparin-like substances and Water, subsequent cleaning of membrane filaments and other post-treatments are very simple; at the same time, the process steps are simple, easy to operate and realize, and easy to promote industrial production.

The invention relates to a method for constructing a biosensor, specifically to a method for constructing a nanocellulose paper-based biosensor. The objective of the invention to overcome the problemsof low detection efficiency and poor detection accuracy of conventional paper-based biosensors caused by great internal porosity and rough surfaces in the prior art. The method comprises the following steps: 1, peparation of nanocellulose: sequentially subjecting a cellulose raw material to extraction and delignification so as to obtain total cellulose, and then carrying out mechanical pretreatment, chemical-mechanical mixed pretreatment or biomechanical mixed pretreatment to obtain aqueous hemicellulose-containing nanocellulose liquid; 2, preparation of nanopaper; and 3, construction of thenanopaper-based biosensor. Detection results show that the nanopaper prepared in the invention has no obvious voids and micron-order roughness, wherein the porosity of the nanopaper is more than 1%, and the roughness of the nanopaper is less than 1 [mu]m. The method provided by the invention is applied to the field of biosensors.

The invention discloses a method for catalytically degrading phthalate pollutant by directly utilizing sunlight, and belongs to the technical field of environmental engineering. The method comprises the following steps: preparing supernate by using low-price easily-available urea as a raw material through stepwise roasting, ultrasonic peeling and centrifuging; drying to obtain nano-carbon nitride having grain size mainly distributed in a range of 30-50nm; and modifying with a coupling agent, dispersing in a methyl alcohol solution, uniformly applying and immobilizing to the inner surface of a pre-treated glass container. The treated glass container serving as a catalyst can be used for remarkably accelerating the degrading process of phthalate under sunlight radiation, and the removal rate can be 95-100 percent. The method is applicable to actual operation of a pollutant treatment field, has high efficiency and low cost, is beneficial innovation of introducing sunlight catalysis to the environmental engineering; the catalyst is a non-metallic ingredient, does not have secondary pollution risk, has uniform and firm immobilization, is convenient for reclaiming and recycling after reaction, and has relatively good commercial value and application prospect.

The invention discloses a preparation method of a polyurethane-based composite photocatalytic film. The polyurethane particles are fully dissolved in a solvent to obtain a polyurethane solution; silk fibroin powder is added to the polyurethane solution, stirred evenly, and defoamed to obtain a coating liquid; The coating liquid is evenly coated on the release paper, and the film is quickly immersed in the aqueous solution to solidify into a film, then take out, dry, and peel off the release paper to obtain a polyurethane / silk fibroin blend film; immerse the polyurethane / silk fibroin blend film in a silver nitrate solution Take it out after being absorbed in the middle to avoid light, then immerse it in sodium chloride solution, take out, wash, and dry to obtain the AgCl material supported by the polyurethane / silk fibroin blend film; the AgCl material supported by the polyurethane / silk fibroin blend film is irradiated under a UV lamp , the polyurethane-based composite photocatalytic film was obtained. Provide its application in degrading organic pollutants in water and sterilizing and disinfecting. The invention has the characteristics of easy availability of materials, good catalytic performance, easy recovery and no secondary pollution.

The invention relates to a method for preparing a stationary phase coating material for trace substance identification and application of the material. The method comprises the following steps of: adding carbosilane hyperbranched macromolecules with allyl terminals and MeHSiCl2 into a solvent, adding a Kastedt catalyst, and performing hydrosilylation reaction in the presence of nitrogen; adding triethylamine, fully dried cyclodextrin and fully dried tetrahydrofuran (THF) for bonding reaction; and finally cooling and separating, thus obtaining the material. The material is coated on capillary inner columns; and the material has the advantages of uniform film formation, high column efficiency and high adsorption quantity, and has analysis and identification capability for trace substances.

The invention discloses a method for preparing a sulfur-doped hypoxia type TiO2 photocatalyst. Sodium silicate serves as a silicon source, titanium sulfate serves as a titanium source, sulfate radicals serve as a doped sulfur source, sodium sulfide serves as a reducing agent, first a silica gel immobilized TiO2 / TiS2 copolymer is prepared through an ultrasound copolymerization method, the mixing amount of the sulfate radicals is changed, a product precursor is synthesized by in-situ symbiosis at 140-160 DEG C, and finally a silica gel immobilized sulfur-doped hypoxia type TiO2 photocatalyst (S / hypoxia type TiO2) material is prepared through sintering at 650-800 DEG C under the protective atmosphere of N2. Obtained results indicate that the goals of O vacancy defect and S effective doping are achieved successfully, and good conditions are created for photocatalysis red shift of the TiO2 photocatalyst and efficient utilization of solar light. Besides, the product is high in purity and good in crystal condition.