30results about How to "Increased photodegradation rate" patented technology

The invention relates to a nanometer ZnO/graphene photo-catalyst and a preparation method thereof. The photo-catalyst is a composite nanometer photo-catalyst which adopts the graphene as the frame and is carried with ZnO, wherein the mass rate of the graphene and the ZnO nanometer particles is 1:100-10:100. Because of adding of GS, the recombination rate of the electron-hole is reduced, and the photo-degradation ratio is greatly improved during the process of degrading methyl oranges under the irradiation of ultraviolet lights. If optimization of parameters is considered, If optimization of parameters, such as optimum ratio of the adding quantities of ZnO and GS, and the influences of pH and temperature are considered, so the prepared ZnO/GS combined catalyst has low cost, can be recycled and used, has good photo-catalyst effect, and can be applied to the photo-catalyst treatment of industrial waste water and waste gas.

The invention relates to the technical field of magnetic nanocomposite materials, in particular to a molybdenum disulfide/ferroferric oxide magnetic nanocomposite material and a preparation method andapplication thereof. The molybdenum disulfide/ferroferric oxide magnetic nanocomposite material is of a flower type structure and is prepared by combining molybdenum disulfide and ferroferric oxide supported on the surface of molybdenum disulfide; and heterojunction is formed between molybdenum disulfide and ferroferric oxide. The photocatalytic degradation rate of organic pollutants for TC by the molybdenum disulfide/ferroferric oxide magnetic nanocomposite material is increased by 172.8% and 71.3% separately compared with a MoS2 material and a Fe3O4 material, and after recycling is performed for 5 times, the photodegradation rate of TC is only reduced by 3.5%. The test results show that the molybdenum disulfide/ferroferric oxide magnetic nanocomposite material is excellent in photocatalytic degradation effect on the organic pollutants and good in cycling stability.

The photostability of oxymetazoline in a topical decongestant composition is enhanced by lowering the pH of the composition using a buffer solution.

The invention provides a plant-based biodegradable 3D printing material. The 3D printing material is characterized by comprising the following raw materials in parts by weight: 20 to 45 parts of hot chromium polylactic acid ester containing straw fiber, 10 to 40 parts of polylactic acid ester containing bamboo fiber, 20 to 50 parts of biological rubber, 10 to 25 parts of nylon 11, 2 to 4 parts of hydroxy acrylic resin, 5 to 15 parts of ultra-fine fillers, 1.2 to 3.6 parts of a coupling agent, 1 to 5 parts of photosensitive resin, and 2 to 6 parts of an antioxidant. By performing the simulation of the biological decomposition process in natural environment containing water and microorganism on the 3D printing material according to a GB/T19276.1-2003 standard, the highest biological decomposition rate measured can reach 98 percent, the highest photodegradation rate can reach 92 percent, the highest tensile strength measured can reach 15 MPa, and the highest bending strength can reach 12 MPa.

The invention discloses a preparation method of an 8-hydroxyquinoline iron organic dye photodegradation catalyst, and belongs to the field of metal-organic complexes. The method comprises the following steps: firstly, preparing a photodegradation catalyst reaction solution, dissolving ligands in N,N-dimethylformamide or methanol, dissolving an iron salt in methanol or N,N-dimethylformamide, mixingthe obtained two solutions, carrying out stirring at room temperature, heating the prepared reaction liquid to 60-80 DEG C for a reaction, slowly carrying out cooling to room temperature after the reaction is finished to obtain a brown black block crystal, then carrying out washing in methanol, and carrying out airing, so as to obtain the 8-hydroxyquinoline catalyst with catalytic activity. Themethod provided by the invention has simple operation, mild condition and low cost, and the efficiency is high when the catalyst is applied to organic dye photodegradation, so that the method providedby the invention has feasibility in industrial application.

The invention discloses a method for preparing a cellulose membrane based on chitosan. The cellulose membrane prepared from the components such as modified titanium dioxide, pretreated cellulose and chitosan not only has excellent antibacterial and bactericidal effects, but also greatly improves the photocatalytic activity of the cellulose membrane, responds to visible light, and can effectively degrade organic matters; thiourea is used as a nitrogen-sulfur doping source, nitrogen-sulfur doped modified titanium dioxide is prepared through a sol-gel method, and nitrogen-sulfur doping can properly inhibit grain growth of titanium dioxide, so that the specific surface area of the titanium dioxide is increased, the titanium dioxide responds to visible light, and the photocatalytic activity ofthe titanium dioxide is improved; the preparation method is reasonable in process design and simple to operate, the cellulose membrane is prepared from chitosan, cellulose and other components; and meanwhile, the cellulose membrane has excellent antibacterial performance and photocatalytic performance, can be widely applied to the fields of sewage treatment, biomedical treatment and the like, andhas relatively high practicability.

The invention discloses a biodegradable environment-friendly material for food package and a preparation method thereof. The biodegradable environment-friendly material for food package is mainly prepared from, by weight, 20-30 parts of float glue, 30-40 parts of polylactic acid, 8-15 parts of corn starch, 5-8 parts of cortex acanthopanacis, 2-4 parts of celery, 1-5 parts of towel gourd stem, 0.5-0.8 part of sodium stearate, 2-6 parts of D-isoleucine, 4-8 parts of ethyl acetate and 0.5-0.9 part of chlorogenic acid. The obtained biodegradable environment-friendly material for food package meets the standard GB/T 19276.1-2003, the biological degradation process in a natural water environment is simulated, it is tested that the highest biological degradation rate of the material can be up to 98%, the highest photodegradation rate is up to 95%, and other performance indicators are excellent.

The invention discloses a silver phosphate composite photocatalyst with magnetism as well as a preparation method and application thereof. The preparation method of the silver phosphate composite photocatalyst is characterized by taking silver nitrate, disodium hydrogen phosphate and magnetic iron as raw materials, regulating a mass ratio of all reagents and reacting, thus obtaining a nano composite material (Ag3PO4@Fe3O4-100) of a magnetic iron loaded Ag3PO4 thin film; finally gently modifying the Ag3PO4@Fe3O4-100 by using Na2S, thus preparing an Ag2S doped Ag3PO4 thin film loaded type magnetic photocatalyst (Ag2S/Ag3PO4-Fe3O4-100) which is fast, efficient and light corrosion-resistant, wherein the Ag2S/Ag3PO4-Fe3O4-100 is used for photocatalytic degradation on organic pollutants such asdye, antibiotics and insecticides in a water body. The silver phosphate composite photocatalyst disclosed by the invention has the advantages that the degradation speed of the organic pollutants in the water body is fast, the efficiency is high, separation and recovery are easy, and the silver phosphate composite photocatalyst can resist light corrosion, can be cyclically utilized for many times and has wide application value.

The invention discloses biodegradable foamed polypropylene, and particularly relates to the technical field of high polymer materials. The biodegradable foamed polypropylene is prepared from the following raw materials: a polypropylene resin, starch, calcium hydroxide, vinyl acetate, a dispersing agent, an antioxidant, a foaming nucleating agent, a photodegradation agent and a toughening agent. According to the invention, calcium hydroxide and the vinyl acetate are used for modifying starch, an alkaline earth metal calcium hydroxide is used for primarily modifying the starch so as to improve the compatibility of the starch, and then ceric ammonium nitrate is used for carrying out graft copolymerization reaction on the vinyl acetate and the starch so as to greatly improve the compatibility of the modified starch after graft copolymerization, so that the mixing effect of the starch and the polypropylene is good so as to effectively improve the biodegradation rate of the polypropylene material; the photodegradation rate of the polypropylene material can be effectively improved by adding the photodegradation agent while the foamed polypropylene material is treated by utilizing biodegradation and photodegradation so as to greatly improve the degradation rate of the foamed polypropylene material.

The embodiment of the invention discloses an antibacterial photo-degradation composite film as well as a preparation method thereof and application thereof. The composite film is prepared from the following raw materials: modified nano TiO2, potassium sorbate, calcium propionate, Span 80, LLDPE (linear low density polyethylene) and HDPE (high-density polyethylene). The raw materials are speciallyselected, so that the prepared composite film has excellent mechanical property, antibacterial property and photo-degradation property.

The invention relates to the technical field of packaging bag degradation, and particularly discloses a photodegradable environment-friendly plastic packaging bag and a production process thereof. The photodegradable environment-friendly plastic packaging bag is mainly prepared from the following raw materials: polyethylene, a cross-linking agent, a dispersing agent, a plasticizer, a photosensitizer, a photosensitive accelerant, a compatilizer and a transforming agent. The transforming agent is at least two of indocyanine green, nano iron sulfide and polyaniline. The photosensitizer is at least two of iron stearate, cerium stearate and stearic acid symbiotic rare earth. The production process of the photodegradable environment-friendly plastic packaging bag comprises the following steps of: (1) mixing and stirring raw materials, heating and dehydrating to obtain a mixture; (2) adding the mixture into a film blowing machine, heating, blowing the film, cooling and pressing edges to obtain a material film; and (3) preparing a finished degradable plastic packaging bag from the material film. The photodegradable environment-friendly plastic packaging bag prepared by the invention is high in degradation rate.

The invention discloses a degradable environmentally-friendly material for food packaging. The degradable environmental-protection material for the food packaging is prepared from, by weight, 20-30 parts of colloidal bismuth pectin, 30-40 parts of polylactide, 8-15 parts of corn starch, 5-8 parts of cortex acanthopanacis, 2-4 parts of dicranum scoparium, 1-5 parts of towel gourd stem, 0.5-0.8 part of sodium stearate, 2-6 parts of D-isoleucine, 4-8 parts of ethyl acetate, and 0.5-0.9 part of chlorogenic acid. The obtained degradable environmentally-friendly material for the food packaging is adopted a simulated biological decomposition process in the natural aqueous environment according to the GB/T 19276.1-2003 standard, the obtained biological decomposition rate after testing can reach 98% at most, the photodegradation rate of the material reaches 95% at most, and the other performance indexes are excellent.

The invention discloses a degradable food packaging material and a method for preparing the same. The degradable food packaging material is mainly made of, by weight, 20-30 parts of carrageenan, 30-40 parts of polylactic acid, 8-15 parts of corn starch, 5-8 parts of cortex acanthopanacis, 2-4 parts of dicranum scoparium, 1-5 parts of herba plantaginis, 0.5-0.8 part of sodium stearate, 2-6 parts of D-isoleucine, 4-8 parts of ethyl acetate and 0.5-0.9 part of chlorogenic acid. The degradable food packaging material and the method have the advantages that biological decomposition procedures of the degradable food packaging material are simulated in natural water-containing environments according to GB/T 19276.1-2003 standards, the maximum tested biological decomposition rate of the degradable food packaging material can reach 98%, the maximum tested light degradation rate of the degradable food packaging material can reach 95%, and the degradable food packaging material is excellent in other performance indexes.

The invention discloses a degradable material for food package and a preparation method of the degradable material for food package. The degradable material for food package is prepared from, by weight, 20-30 parts of ichthyocolla, 30-40 parts of polylactic acid, 8-15 parts of sweet potato starch, 5-8 parts of cortex acanthopanacis, 2-4 parts of dicranum scoparium, 1-5 parts of herba plantaginis, 0.5-0.8 part of sodium stearate, 2-6 parts of D-isoleucine, 4-8 parts of ethyl acetate and 0.5-0.9 part of chlorogenic acid. The degradable material for food package has advantages that by simulation of a biological decomposition process in a natural watery environment according to GB/T 19276.1-2003 standards, the biological decomposition rate reaches 98% maximally in test, the light degradation rate of the material reaches 95% maximally, and other performance indexes are excellent.