243 results about "Oxidative activity" patented technology

The invention belongs to the technical field of photocatalysis, and discloses a graphene composite photocatalyst which is compounded from graphene and a semiconductor photocatalysis material, a preparation method and application thereof. The graphene composite photocatalyst is a composite photocatalysis material with a surface heterogeneous structure and comprises a graphene lamella and the semiconductor photocatalyst packaged by the graphene lamella. The graphene composite photocatalyst is prepared by a double-solvent photocatalytic reduction method adopting deionized water and a reducing alcohol agent, wherein the reduction of the graphene and the formation of a heterogeneous junction structure are finished by one step; the process is simple and convenient; and reagents are cheap. The catalyst has the characteristics of high adsorbability and high photocatalytic oxidative activity, is used for environment improvement and solar conversion and utilization such as air purification, sewage treatment, photocatalytic decomposition of water to prepare hydrogen, photocatalytic reduction of CO2 to synthesize alcohols, hydrocarbon fuels and the like.

The related preparation method for nano product of cerium oxide comprises: with water, organic solution or mixed solvent, taking hydrothermal process the soluble cerium salt, and obtaining the product as nano granule, nano rod, nano fiber, and nano prism all with well catalytic activity. This invention is simple and low cost, and has wide application.

The invention provides a Ti-Si molecular sieve and a synthesis method thereof. The crystal surface of the Ti-Si molecular sieve is rich in Si, and the surface Ti-Si ratio of the Ti-Si molecular sieve is higher than the bulk-phase Ti-Si ratio of the Ti-Si molecular sieve. The synthesis method of the Ti-Si molecular sieve comprises the steps as follows: mixing a Ti source, a template agent, an organic Si source, an inorganic Si source and water, removing alcohol by hydrolysis, aging, mixing an aged product with a solid Si source, performing crystallization in an airtight reaction kettle, and recycling the Ti-Si molecular sieve. The Ti-Si molecular sieve provided by the invention has higher oxidative activity, and the activity in non-effective decomposition of hydrogen peroxide in side reaction is obviously reduced.

The invention discloses a catalyst for purifying exhaust gas of a natural gas engine and a preparation method thereof. The catalyst consists of a carrier, a coating coated on the carrier and catalytic active components loaded on the coating, wherein the carrier of the catalyst is made of a honeycomb cordierite ceramic material, the coating is a mixture of activated alumina, a ceria-zirconia solid solution, a rare-earth oxide, an alkaline-earth metal oxide and a caking agent, and the catalytic active components include a platinum group metal and at least one transition metal composite oxide or one transition metal-rare earth composite oxide. Since the transition metal composite oxide or the transition metal-rare earth composite oxide has high oxidative activity for hydrocarbon, and the rare-earth and alkaline-earth metal oxide in the coating has good stabilization effect on the coating and the active components, therefore, the catalyst disclosed by the invention has high catalytic activity and stability for hydrocarbon compounds, the dosage of precious metal is greatly reduced, and the cost of the catalyst is lowered. Moreover, the catalyst can be used for purifying the exhaust gas of the natural gas engine, and besides, the catalyst can be also used for purifying the exhaust gas of automotive vehicles which take gasoline or liquefied petroleum gas as fuel.

The invention discloses a supported silver catalyst for reducing soot particle burning temperature and a preparation method, relating to catalysts. The catalyst comprises an active component and a carrier, wherein the active component is silver; the carrier is cerium dioxide or cerium-based composite oxide; the supported amount of silver is 1-20% of the weight of the carrier; and the cerium-based composite oxide has the general formula of Ce1-xMxOy, and M is rare-earth metal. The carrier is prepared by adding a surfactant as a template into a cerium-based solution through a hydrothermal precipitation method. The catalyst is prepared by introducing a complexing auxiliary agent into a water-based silver nitrate solution, evaporating to dryness and baking. The prepared catalyst has excellent oxidative activity in the process of soot burning, is capable of reducing the temperature of soot T50 from 642 DEG C to about 400 DEG C to reach the operating temperature range of a diesel engine, and reaches and exceeds various types of reported soot particle burning catalysts under the same evaluation conditions.

The invention discloses an antioxidant peptide of hairtail fish protein as well as a preparation method and uses of the antioxidant peptide. In particular, hairtail fish is used as raw materials; an enzymatic hydrolysis solution is obtained through degreasing and enzymolysis of protamex and neutral protease; the enzymatic hydrolysis solution is separated and purified through ultra-filtration, purification of macroporous resins, cation exchange resin chromatography, gel column chromatography, and reversed-phase high-performance liquid chromatography so as to obtain the antioxidant peptide Asn-Trp-Asp-Met-Glu-Lys-Ile-Trp, and the ESI-MS determining molecular weight is 1121.25da. The high-activity antioxidant peptide disclosed by the invention has a good scavenging effect on DPPH free radicals, hydroxyl radicals and superoxide anion free radicals; besides, the antioxidant peptide shows a good effect of lipid peroxidation inhibition. The antioxidant peptide has the advantages of safe use, zero toxic or side effects, high oxidative activity and the like, is liable to digest and absorb, and can be used as medicines, health food or food additives, and the like.

A process of leaching gold comprising the steps of: a) leaching copper from copper sulfide ore material that contains gold or contains silicate ore containing gold until the copper grade is reduced to 7.9 wt % or less; b) mixing the resulting material having a copper grade of 7.9 wt % or less with a gold leaching solution selected from the group consisting of a first solution containing chloride ions and ferric ions, and a second solution containing chloride ions and iron ions, the iron ions having been oxidized to trivalent ferric ions by air bubbled into the second solution; c) adjusting the pH of the gold leaching solution to 1.9 or less with stirring to leach at least gold in the material into the gold leaching solution by the oxidative activity of the ferric ions contained in the gold leaching solution, wherein the concentration of gold is reduced by selectively removing gold from part or all of the gold leaching solution during gold leaching. This process efficiently leaches at least copper and gold from a copper sulfide ore.

The invention relates to the field of catalytic materials and in particular provides a titanium silicalite molecular sieve, a synthetic method and application of the titanium silicalite molecular sieve. The titanium silicalite molecular sieve is composed of the following elements in percentage by mass: 0.01-5% of precious metals, silicon, 0.02-8% of titanium and oxygen, wherein the I960/I550 valueis 0.6-0.9; the U480/U330 value is 0.5-5; and the N-116/N-112 value is 0.01-0.2. The invention further provides a cyclic ketone oxidation method. The cyclic ketone oxidation method comprises the following step: contacting cyclic ketone, an oxidizing agent and a catalyst, wherein the catalyst contains the titanium silicalite molecular sieve disclosed by the invention. Compared with the prior art,the titanium silicalite molecular sieve disclosed by the invention has the advantages that diffusion of the reactants and product is facilitated in an oxidation reaction, so that oxidative activity isfully achieved, and the selectivity is improved. For example, when applied to a reaction in which ring molecules, particularly cyclic ketone molecules, participate or are produced, the titanium silicalite molecular sieve can achieve excellent catalytic effects. Moreover, filtration and separation of the catalyst after the reaction can be further facilitated, and industrialized application is easily realized.

The invention discloses antioxidation bioactive peptide and a method for making the same. The product is made through the following steps that: microbial bacillus natto and corn protein powder are respectively used as strain and a raw material, which undergo liquid culture; and fermentation broth is separated through ion exchange chromatography, gel chromatography, reversed phase chromatogram and electrophoresis. The molecular weight of the product is between 20,100 and 31,000 and the five amino acid sequences at an N terminal are K-V-T-Y-H with the antioxidation activity reaching to 236.68U/mL. Moreover, the product has higher antioxidation activity, and pure product can meet the requirements of structural and physical property measurements of antioxidation bioactive peptide, activity and toxicological experiments as well as large-scale application such as therapy and cultivation; because antioxidation active material has strong cleaning action on superoxide anion free radical and hydroxyl free radical and can remarkably inhibit the overoxidation reaction between red blood cell and the lipid of liver, heart and brain tissue, the product has functions such as disease prevention and aging resistance and can be further developed into additives of products such as medicine and cosmetic.

The invention relates to a titanium-silicon micro-mesoporous molecular sieve composite material and a synthetic method thereof. The titanium-silicon micro-mesoporous molecular sieve composite material is rich in silicon on the surfaces of crystal grains, wherein the surface silicon-titanium ratio is higher than that of a bulk phase. The synthetic method of the titanium-silicon micro-mesoporous molecular sieve composite material comprises the following steps: mixing a titanium source, a template, an organic silicon source, an inorganic ammonium source and water; hydrolyzing to propel alcohol, aging, and mixing with a solid silicon source; and then crystallizing in a closed reaction kettle and recovering the titanium-silicon micro-mesoporous molecular sieve composite material. The titanium-silicon micro-mesoporous molecular sieve composite material provided by the invention has high oxidative activity and the noneffective decomposition activity of hydrogen peroxide in side reaction is remarkably reduced.

The invention discloses an organic positive electrode active material as well as a preparation method and an application of the organic positive electrode active material. The organic positive electrode active material is obtained by polymerizing two materials with oxidative activity sites and has more redox couples and higher molecular weight as well, and the problem about dissolving of small organic molecules is solved. When the material is applied to preparation of alkali metal ion batteries or alkaline earth metal ion batteries, an organic polymer can quickly have a redox reaction during charging and discharging due to the fact that the number of the redox couples is larger, and the prepared alkali metal ion batteries or the alkaline earth metal ion batteries have the characteristics of high specific capacity and large charge-discharge rate, high specific energy, good stability and long service life.

The invention discloses an antioxidation active synthetic peptide and a purpose thereof. a polypeptide provided by the invention is any one of the following polypeptides 1) to 3): 1) a polypeptide shown by a sequence I in a sequence table; 2) a polypeptide shown by a sequence 2 in the sequence table; and 3) a polypeptide shown by a sequence 3 in the sequence table. According to the invention, it is proved by experiments that three polypeptides with antioxidation activity are synthesized; as the antioxidation peptide has the advantages of small molecular weight, high activity, easiness in artificial synthesis, low cost and so on, the antioxidation peptide can be widely applied to large-scale production in industries, such as foods, cosmetics, medicines and the like; and the antioxidation active synthetic peptide disclosed by the invention can be specifically used as an antioxidant in aspects, such as cosmetics, food healthcare products, animal feed additives, medicines and the like.

The invention provides an extraction method for high-purity high-oxidative-activity aronia melanocarpa procyanidine and belongs to the technical field of extraction and purification of procyanidine. The method comprises the following steps: as aronia melanocarpa is taken as a raw material, firstly, adopting a freeze drying technology to obtain aronia melanocarpa freeze-dried powder; then, extracting the aronia melanocarpa freeze-dried powder by adopting a supercritical CO2 extraction technology; finally, purifying the aronia melanocarpa procyanidine by adopting an AB-8 type macroporous adsorption resin purification technology. According to the extraction method, the freeze drying technology and the supercritical CO2 extraction technology are adopted so that the extraction efficiency is improved and the biological activity is kept; the macroporous resin purification technology is adopted so that the extraction purity of the aronia melanocarpa procyanidine is improved and the purity reaches to 90.1%-98.6%; the cleaning capability of the aronia melanocarpa procyanidine to DPPH (1,6-bis(diphenylphosphino)hexane) is within a range from 11.2 micrograms/milliliter to 15.6 micrograms/milliliter; the obtained procyanidine is high in purity and good in activity, can be directly applied to medicines and health-care foods.

A non-stoichiometric perovskite oxide having the general chemical formula LaXMnOY, in which the molar ratio of lanthanum to manganese (X) ranges from 0.85 to 0.95, can be used in particle form as an oxidation catalyst to oxidize NO to NO2 in an exhaust aftertreatment system for a hydrocarbon-fueled engine. The oxygen content (Y) fluctuates with variations in the molar ratio of lanthanum to manganese but generally falls somewhere in the range of 3.0 to 3.30. The crystal lattice adjustments spurred by the non-stoichiometric molar ratio of lanthanum to manganese are believed responsible for an enhanced NO oxidative activity relative to similar perovskite oxides with a higher molar ratio of lanthanum and manganese.

The invention discloses an alcohol oxidation aldehyde ketone production applied novel catalyst and a preparation method thereof. According to the alcohol oxidation aldehyde ketone production applied novel catalyst, hydrotalcite-like compounds serve as the carrier, metal complexes which is one or two of V, Cr, Mn, Fe, Co, Ni, Cu, Au, Pd, and Pt serve as a catalytic oxidative activity center, and the content of carried metal elements is 0.03-5.00% of the total mass of the alcohol oxidation aldehyde ketone production applied novel catalyst. The invention also discloses the preparation method of the alcohol oxidation aldehyde ketone production applied novel catalyst. According to the alcohol oxidation aldehyde ketone production applied novel catalyst and the preparation method thereof, alcohol and oxidants serve as the raw materials, under the action of the prepared alcohol oxidation aldehyde ketone production applied novel catalyst, high ketone conversion rate and high aldehyde ketone absorbing rate can be achieved; meanwhile, no acid or alkali or organic additives exist in a reaction system, so that the alcohol oxidation aldehyde ketone production applied novel catalyst has the advantages of being high in yield rate, low in cost, free from environmental pollution, easy to separate, high in repeatability and the like. Meanwhile, the preparation method of the alcohol oxidation aldehyde ketone production applied novel catalyst has the advantages of being rich in raw material resource, free from environmental pollution and the like.

The invention discloses a preparation method of perovskite catalytic persulfate. The method comprises the following steps that (1) La(NO3)3 6H2O, Fe(NO3)3 9H2O and C6H8O7 H2O are respectively weighed according to the mol ratio of La:Co:CA being 1:1:2; water is added so that the raw materials are dissolved; stirring is performed for 12h under the room temperature condition; a precursor solution is obtained; (2) the prepared precursor solution is put into a 80 DEG C water bath heating pot for still standing for 12h, so that the prepared precursor solution completely becomes gel; (3) the raw materials are put in a vacuum drying box for 12h to be dried; (4) the temperature of a muffle furnace is raised to 50 DEG C at a speed being 5 DEG C/min; calcination is performed for 3h; a catalyst of LaFeO3 powder is obtained; (5) the calcined LaFeO3 powder is ground into uniform fine particles for use. The perovskite catalyst LaFeO3 can efficiently activate persulfate; SO4 - with high oxidative activity is produced; the removal of non-degradable medicine pollutants is completed; the water quality is obviously improved; the water quality safety is guaranteed. La(NO3)3 6H2O and Fe(NO3)3 9H2O which are cheap and are easily obtained are used as major preparation raw materials; the perovskite catalyst LaFeO3 is prepared through work procedures of water bath, gelling, drying, calcinations and grinding.

The invention discloses a mixed feed for improving antioxidant activity of the sperm of a boar. The mixed feed is characterized by comprising the following raw materials by weight: 40 to 60% of corn, 5 to 20% of fish meal, 5 to 20% of wheat, 10 to 25% of wheat bran, 0.2 to 5% of a soybean small peptide additive, 0.05 to 2% of taurine, 2 to 10% of soybean meal, 2 to 8% of plant oil, 1 to 2% of a calcium element additive, 0.1 to 0.8% of salt, 0.05 to 0.5% of N-carbamylglutamic acid, 0.1 to 0.3% of a composite trace element additive, 0.03 to 0.08% of a composite vitamin additive, 0.005 to 1% of anthocyanidin, 0.05 to 2% of tea polyphenol, 0.5 to 1.5% of amino acid and 0 to 5% of bentonite. The mixed feed is applicable to the boar, can effectively increase the amount of boar seminal fluid, improve sperm vitality and sperm density, reduce the rate of sperm deformation and enhance antioxidant activity of the sperm of the boar and is of great significance to improvement of the quality of boar seminal fluid.

The invention discloses a method for synthesizing a titanium silicate molecular sieve employing an organic quaternary ammonium salt template agent. The synthesis method of the titanium silicate molecular sieve comprises the following steps: (1) mixing a titanium source, a template agent, an organosilicone source, an optional inorganic ammonium source and water, hydrolyzing to remove alcohol, aging, mixing the aged mixture with a solid silicon source, crystallizing in a closed reaction kettle, and recycling the titanium silicate molecular sieve. The titanium silicate molecular sieve grain obtained by the method is rich in silicon; the surface silicon-titanium ratio of the titanium silicate molecular sieve is higher than the bulk-phase silicon-titanium ratio; the titanium silicate molecular sieve disclosed by the invention has relatively high oxidative activity; and the invalid decomposition activity of side reaction hydrogen peroxide is obviously reduced.

The invention provides a method for detection of inflammatory disease in a subject that comprises assaying a test sample of peripheral blood from the subject for a marker of DNA damage. An elevated amount of marker present in the test sample compared to control sample is indicative of inflammatory disease activity, including sub-clinical inflammation. The method can be adapted for quantitatively monitoring the efficacy of treatment of inflammatory disease in a subject. Markers of DNA damage include single- and/or double-stranded breaks in leukocytes, oxidative DNA damage in leukocytes, or a marker of nitric oxide oxidative activity (protein nitrosylation in leukocytes). The inflammatory disease can be inflammatory bowel disease (ulcerative colitis or Crohn's disease). The invention may also be used for detection of other types of inflammatory disease, such as non-immune intestinal inflammatory disease (diverticulitis, pseudomembranous colitis), autoimmune diseases (rheumatoid arthritis, lupus, multiple sclerosis, psoriasis, uveitis, vasculitis), or non-immune lung diseases (asthma, chronic obstructive lung disease, and interstitial pneumonitis). This unexpected discovery of markers of genotoxicity present in circulating leukocytes enables detection of inflammation occurring at a localized site with a relatively simple and minimally invasive assay using peripheral blood.

The invention discloses an ethanol gas sensor based on an In2O3 microflower/SnO2 nanoparticle composite material and a preparation method of the sensor, belonging to the technical field of gas sensors. The ethanol gas sensor consists of a nickel-cadmium alloy heating coil, an alumina ceramic tube, a platinum wire, a gold electrode and an In2O3 microflower/SnO2 nanoparticle composite material. By utilizing the catalytic activity of SnO2 on In2O3, the oxidative activity of the material is improved, so that the sensitivity of the sensor is greatly improved, materials with morphology are directly mixed at the first time, the large specific surface area of the material is utilized, and the catalytic characteristics between oxides are utilized. According to the material, ethanol gas molecules are transported on the surface and have the characteristics of rapid adsorption and desorption, so that the response and recovery speed of the sensor is increased. Compared with an ethanol sensor manufactured by In2O3 microflowers which are not compounded with SnO2 nanoparticles, the ethanol sensor disclosed by the invention has the advantages that the sensitivity is greatly improved, and the sensitivity of the ethanol sensor disclosed by the invention is about 9.5 times that of the sensitivity of the ethanol sensor manufactured by In2O3 microflowers.

The invention discloses a method used for improving antioxidant activity and antibacterial activity enteromorpha polysaccharide at the same time. The method comprises following steps: enteromorpha polysaccharide is degraded with hydrogen peroxide and vitamin C so as to obtain degraded enteromorpha polysaccharide; chloroacetic acid is taken as a carboxymethylation reagent, and is reacted with the degraded enteromorpha polysaccharide so as to obtain carboxymethylated enteromorpha polysaccharide (CDEP). The obtained CDEP possesses relatively low molecular weight (20 to 120kDa), and relatively excellent in vitro antioxidant activity and antibacterial activity, and the degree of carboxymethyl substitution (DS) ranges from 0.3 to 1.0.

The invention discloses a gold catalyst removing carbon monoxide, formaldehyde and ethylene and preparation and application, and belongs to the field of air purification. The preparation method of the gold catalyst removing carbon monoxide, formaldehyde and ethylene comprises the following steps: adding a metallic oxide or hydroxide into a chloroauric acid liquor; stirring or shaking; centrifugalizing; washing solids till no residual chloridions exist; and drying to obtain the gold catalyst removing carbon monoxide, formaldehyde and ethylene. According to the preparation method provided by the invention, as no precipitators are additionally added and the pH is not controlled and the temperature of the system is not raised, gold is absorbed on the surface of a metallic oxide or hydroxide carrier, so that the utilization ratio is high and the carrier selective range is wide. The gold catalyst prepared by the method disclosed by the invention has high catalytic oxidative activity to carbon monoxide, formaldehyde and ethylene, so that the gold catalyst can be applied to air purification.

The invention discloses a preparation method of microwave nitric acid modified activated carbon for removing lead ions in water and application of the microwave nitric acid modified activated carbon. The preparation method comprises the following steps: (1) preparing a nitric acid solution with the concentration being 5mol/L and more; and (2) dipping activated carbon into the solution prepared in the step (1), maintaining for a certain time under a microwave heating condition, washing, and drying, so as to obtain the microwave nitric acid modified activated carbon for removing the lead ions in the water. By virtue of the microwave heating temperature, the molecular activity is beneficially improved, and nitric acid can be in adequate contact with the activated carbon; furthermore, by virtue of increase of the temperature, the oxidability of the nitric acid is enhanced, so that the surface of the activated carbon can be oxidized within a short time, and the number of surface functional groups can be increased; by virtue of adequate maintenance time at a certain temperature, the activated carbon can be adequately oxidized by nitric acid molecules; but if the temperature is too high and the maintenance time is too long, pore passages of the activated carbon are easily blocked, and the adsorbing capacity of the lead ions is decreased.

The invention relates to a method for preparing direct methanol fuel cell Pt-Ru/C catalyst, which is characterized by comprising the following steps: (1) adding a carbon carrier into surface active agent and carrying out ultrasonic oscillation to obtain dispersed slurry; (2) adding an aqueous solution of a Pt compound and an Ru compound and carrying out the ultrasonic oscillation to obtained dispersed slurry; (3) dropwise adding a reducing agent for reducing; (4) completely reacting and then filtering, washing and drying to obtain the finished Pt-Ru/C catalyst of which Pt and Ru are electrically deposited on the carbon carrier. The invention has the following technical advantages that: (1) simple step, mild operation condition and easy mass production are achieved; and (2) the Pt-Ru/C catalyst prepared by the method can be used as a positive electrode catalyst and has high electro-catalysis oxidative activity of the methanol and lower carrying capacity which is only 1-2mg/cm<2> lower than common 2-4 mg/cm<2> and higher CO poisoning resistance.