44 results about "Hydrogen peroxide degradation" patented technology

Hydrogels containing catalase co-immobilized with an analyte-sensitive enzyme such as glucose oxidase are disclosed. The hydrogels may be pH-sensitive, and preferably are thin and lightly crosslinked. The catalase is present in concentrations ranging generally from 100 units/ml to about 1000 units/ml. These hydrogels have much faster swelling response times as compared to hydrogels without catalase, and are useful in biosensors and analyte-responsive drug delivery devices. The hydrogels also have an increased useful life, due to protection of the immobilize analyte-sensitive enzyme from degradation by hydrogen peroxide.

The invention belongs to a preparation method of low-molecule brown seaweed glucan. Alkali carbonate solution is used for breaking up seaweed tissue and cells, acid is used for adjusting a pH value to be proper, alginic acid, brown seaweed polysaccharide and brown seaweed starch are extracted from the seaweed tissue and the cells, and the starch is degraded with hydroxide to turn into the brown seaweed glucan with the average molecular weight being 800-1000 Dalton. As reported, the brown seaweed glucan with the low molecular weight can enhance the immunity of a human body and the stress resistance of plants.

Disclosed are compositions and synthesis methods that pertain to biocompatible polymeric capsules capable of undergoing backbone degradation and cargo release upon exposure to biologically relevant concentrations of hydrogen peroxide (50-100 μM of H₂O₂). In the invention, bio-responsive polyester bearing boronic ester triggers groups that degrade upon exposure to low concentrations of H₂O₂. The degradation is induced by transformation of a boronic ester to a phenol, which undergoes a quinone methide rearrangement to break down the polyester backbone.

The invention discloses a degradation method of kelp sulfated polysaccharide, which is characterized in that the kelp sulfate polysaccharide is firstly extracted and separated from kelp, and then degraded by hydrogen peroxide to obtain low molecular weight kelp sulfate polysaccharide. The method has fast degradation speed, very little reagent consumption, simple process, low cost, easy decomposition and removal of excess hydrogen peroxide, basically unchanged sulfuric acid group and total sugar content, concentrated molecular weight distribution, and controllable molecular weight range. Due to the bleaching effect of hydrogen peroxide, the obtained low molecular weight sulfated polysaccharide sample has a white appearance.

The invention discloses a graphene-heme and nanogold ternary composite material, a preparation method and an application, and relates to a hydrogen peroxide catalyst. The ternary composite material comprises the following components by percentage: 40-50 percent of graphene, 20-30 percent of heme and 20-40 percent of nanogold, wherein the total amount of the components is 100 percent. The preparation method comprises the following steps: adding sodium nitrate, sulfuric acid and potassium permanganate into graphite powder serving as a raw material, mixing and reacting until a thick mixture is formed; adding water into the mixture, continuously reacting, adding water and then ending the reaction to obtain a graphite oxide mixed liquid; adding a hydrogen peroxide solution, removing unreacted potassium permanganate, performing suction filtration, washing, centrifuging and drying to obtain the graphene oxide; mixing the obtained graphene oxide and the heme into an aqueous solution, heating, and filtering and drying the obtained solution to obtain the graphene-heme and nanogold ternary composite material; then dissolving in water, and adding chloroauric acid and ascorbic acid to obtain the product. The ternary composite material can be used as a hydrogen peroxide degradation reagent for degrading the hydrogen peroxide in the water.

The invention discloses a method for preparing gelatin by degrading collagenous fiber by using hydrogen peroxide, which comprises: subjecting an animal skin tissue or bone tissue to liming treatment first to obtain coarse collagenous fiber or ossein, and decocting the coarse collagenous fiber or ossein for 3 to 12 hours under a condition that the material to liquid ratio is 1:3 to 1:12, a condition that 0.02 to 1 mmol of hydrogen peroxide is added into each gram of coarse collagenous fiber or ossein material and a condition that the temperature is 50 to 80 DEG C in one step to obtain gelatin solution; and concentrating gelatin solution, drying the concentrate, and crushing the dried product to obtain the high-yield and high-quality gelatin. The method for preparing gelatin is simple and easy to implement, can degrade collagen tissues into gelatin at a lower temperature and in a shorter time period; and compared with the conventional gelatin production method, the method disclosed by the invention is short in production period, small in energy consumption and high in yield.

The invention relates to a one-step preparation method of a magnetic Cu(I) microspheric catalyst. The method includes: mixing chitosan, a bivalent copper source and a bivalent iron source to prepare chitosan-copper-iron precursor solution; dropwise adding the precursor solution into strong alkaline solution to form microspheres, curing, washing the microspheres to neutral, and performing cross linking, washing and drying. The method is simple and low in cost, and stability and hydrogen peroxide degradation catalyzing performance of the prepared magnetic Cu(I) microspheric catalyst are superiorto those of a normal copper-iron Fenton catalyst.

A low-molecular (3000-8000) dermatan sulfate is prepared from the dermatan sulfate through degradation by hydrogen peroxide, ultrafilter, and gel chromatography. Its advantages are sure thrombus-resistant and thrombolytic functions, easy absorption, long semi-life and high biologic utilization rate.

The invention relates to a method for degrading high-molecular-weight polysaccharide containing alpha-1, 3-glycosidic bonds. The method includes: feeding a high-molecular-weight polysaccharide containing the alpha-1, 3-glycosidic bonds and of 60-200mg/mL in concentration into an electrolytic tank with a cathode and an anode; adjusting the solution to be acidic, feeding oxygen to the cathode according to an amount of 4.0-7.0 L oxygen/L polysaccharide solution, and feeding direct current and controlling current density of the cathode to be 10-12mA/cm2; degrading, and collecting electrolyte to obtain. The method has high selectivity to polysaccharide containing the alpha-1, 3-glycosidic bonds and is simple to operate, time-saving, efficient, mild in reaction condition, little to environment pollution and conducive to large-scale production. Importantly, compared with acid degradation and hydrogen peroxide degradation methods, the method has the advantages that an electric Fenton method is high in polysaccharide degradation rate, and obtained low-molecular-weight polysaccharide is narrower in molecular weight range.

The invention discloses a method of catalyzing hydrogen peroxide with molybdate-carried ion exchange resin to degrade trichlorophenol, which comprises the following concrete steps: taking a proper amount of resin, soaking the resin in deionized water, adding a NaOH solution and stirring the solution to convert the resin into an OH- type; in the reaction system, adding a certain amount of molybdate to 5g of OH- resin to obtain an Resin-Mo heterogeneous catalyst; in the reaction system, adding a sufficient amount of H2O2 to start the reaction; and in the reaction system, adjusting the pH value to 8-11 with the water solution of phosphoric acid and sodium hydroxide, under the reaction condition of reacting for 60 minutes at the temperature of 35-45 DEG C; and under the catalysis of the molybdate, degrading the trichlorophenol in the waste water with the hydrogen peroxide under the weak base condition. Under the optimal experiment condition, more than 95 percent of trichlorophenol can be degraded within 60 minutes.

The invention discloses an extraction process of high-purity ultralow-viscosity sodium alginate, which belongs to the technical field of sodium alginate extraction. The method sequentially comprises the following steps: decalcifying, degrading, neutralizing, decolorizing, dehydrating, crushing and drying to prepare the high-purity ultralow-viscosity sodium alginate. In the extraction process, calcium ions are directly removed by adopting an acid removal method in the decalcification step, the calcium ions are thoroughly removed by adopting the acid removal method without residues, and the purity is improved by adopting the acid removal method for decalcification; after the decalcification step, the viscosity of the sodium alginate can be reduced to 4mPa. S to 7mPa. S through cooperation ofmedium-high temperature and hydrogen peroxide degradation, and after the degradation is finished, the hydrogen peroxide is completely decomposed without residues; in the decolorization step, an activated carbon adsorption method is adopted, the activated carbon adsorption capacity is higher, and various water-insoluble substances and pigments can be effectively removed in cooperation with diatomite, so that a glue solution is colorless and transparent. According to the method, the high-purity (88% or above) ultralow-viscosity ( 4mPa. S to 7mPa. S) sodium alginate can be obtained.

The invention discloses a method for degrading landfill leachate membrane concentrate by catalyzing hydrogen peroxide with a single copper salt. The method comprises the following steps: adding a copper salt catalyst and hydrogen peroxide into the landfill leachate membrane concentrate, and carrying out oxidation reaction under the conditions of controlling the pH value of the system to 4-8 and the temperature to 40-60 DEG C. According to the method, the characteristic that Cu (II) can catalyze hydrogen peroxide in a multi-stage mode to generate active oxidizing substances is fully utilized for degrading organic matter in the membrane concentrated solution, a good oxidative degradation effect can be achieved even under the nearly neutral condition, meanwhile, the oxidation reaction is a homogeneous reaction process, no precipitated sludge is generated, the using amount of a copper salt catalyst is small, and the cost is low. The cost of the catalyst is reduced, and the addition amountof Cu (II) is lower than the pollution control standard 40mg/L (GB16889-2008) of a domestic waste landfill site.

The invention relates to an elemental boron reinforced Fenton system and a method for removing 1,2-DCA in underground water. The elemental boron reinforced Fenton system comprises Fe(II), hydrogen peroxide and elemental boron, and the addition amount ratio of the Fe(II) to the hydrogen peroxide to the elemental boron is (0.25 to 1.25) mmol to (0.50 to 2.50) mmol to (6.0 to 10.0) mg. The method specifically comprises the following steps: sequentially adding Fe(II), elemental boron and hydrogen peroxide into underground water containing 1,2-DCA to degrade 1,2-DCA, and obtaining treated underground water after the reaction is finished. Compared with the prior art, the method has the advantages that the 1,2-DCA (1,2-DCA) polluted underground water containing or not containing a surfactant can be efficiently and permanently treated, and the removal rate is 80% or above.

The invention relates to a method for preparing chitosan oligose from fly grub shells, and belongs to fields of food additives, in particular to oligose and a preparation method thereof. The method comprises the following steps: grinding the fly grub shells, laying the fly grub shells and a sodium hydroxide solution into a reflux device, so as to be subjected to heating reflux treatment, filtering the fly grub shells through a gauze, washing to be neutral, insolating the fly grub shells in the sun, so as to be decolored, degrading with hydrogen peroxide under the neutral condition, performing suction filtration, performing rotary evaporation on a filtrate, enabling the filtrate to be precipitated with ethyl alcohol, performing vacuum drying and crushing on the precipitate, and then obtaining the soluble chitosan oligose. The method ensures that the yield of the chitosan oligose is 48.29 percent, and has the characteristics of simple technology, high operability, high product yield, high product quality and the like.

The invention discloses a method for degrading organic wastewater based on cooperation of natural tourmaline and hydrogen peroxide, and particularly relates to the field of organic pollutant treatment. The method comprises the steps of preparation of tourmaline powder and treatment of organic matter wastewater. Natural elbaite which is rich in source, low in price, non-toxic and harmless and good in cycling stability and hydrogen peroxide are adopted to synergistically degrade acidic organic wastewater, hydroxyl free radicals with strong oxidizing property are generated, and organic pollutants are successfully degraded. The use method of the natural elbaite is simple, the catalytic process is simplified, the cost is reduced, and the degradation process of the acidic organic wastewater becomes more environment-friendly. An example is provided for safely and effectively degrading organic pollutants by utilizing the pyroelectricity of tourmaline.

A composition suitable for copper chemical-mechanical polishing (CMP) comprises an abrasive powder, such as a silica and/or alumina abrasive, in a liquid carrier. The composition has a transition metal content of less than about 5 parts per million (ppm), preferably less than about 2 ppm. Preferably the composition contains less than about 2 ppm of yttrium, zirconium, and/or iron. The CMP compositions, when combined with hydrogen peroxide, provide CMP slurries for copper CMP that have improved pot life by ameliorating hydrogen peroxide degradation in slurries.

The invention relates to a preparation method of a foliar fertilizer for Trichosanthes kirilowii. The preparation method comprises the preparation steps that Perilla frutescens plants are dried and subjected to superfine pulverizing, extracting is carried out with the assistance of 2-aminoisobutyric acid, calcium citrate, microwaves and ultrasonic waves, concentrating is carried out, and thus a Perilla frutescens extract is obtained; Gleditsia sinensis is dried and pulverized, enzymolysis extracting is carried out with N,N-dimethylglycine, nonylphenol polyoxyethylene ether and proteases, and thus a Gleditsia sinensis extract is obtained; chitin degrades into small-molecule chitosan through hydrogen peroxide; and the prepared Perilla frutescens extract, Gleditsia sinensis extract and small-molecule chitosan, and other materials are stirred to be mixed evenly. The Perilla frutescens and Gleditsia sinensis plants are used as raw materials, so that natural plants are fully utilized, environmental pollution is reduced, and the economic value added of the Perilla frutescens and the Gleditsia sinensis is improved. The prepared Perilla frutescens extract has anti-bacteria and sterilizationeffects. The Gleditsia sinensis extract has the deinsectization effect, after compounding the Gleditsia sinensis extract with various nutrient elements, the incidence rate of diseases and insect pests of Trichosanthes kirilowii crops can be decreased, and the synergistic interaction in improvement of the quality and yield of the Trichosanthes kirilowii is achieved.

The invention discloses a method for degrading tobacco straw lignin. The method comprises constructing a peroxidase gene expression vector containing a rice GRP signal peptide gene, a GFP gene and anSHP gene and introducing the vector into agrobacterium LBA4404 to construct a mature transgenic tobacco plant; finally using hydrogen peroxide to degrade the lignin in the mature transgenic tobacco plant. The peroxidase gene expression vector constructed can overexpress the endogenous SHP enzyme of the crop straw during the normal growth and make the enzyme fully contact with the cell wall components like the straw lignin accompanying the normal growth and development of the crop. The lignin content in the crop straw is not affected. After the harvest of the crop straw and the stalk harvestingin the maturity stage, the stalk is treated by a hydrogen peroxide solution with the volume fraction of 5%, and the lignin content of the stalk of the transgenic plant can be reduced by 3%-5%. The method has a good application prospect in the degradation of the crop straw lignin.

The invention relates to a method for preparing low-molecular-weight polysaccharide. The method comprises the specific steps that a high-molecular-weight polysaccharide solution with the concentration being 40-300mg/mL is introduced into an electrolytic cell provided with a cathode and an anode, and the solution is regulated to be acidic; oxygen is introduced into the cathode with the ratio of oxygen to polysaccharide being (2.0-20.0):1 in liters; and direct current is charged, the cathode current density is controlled to be 5-20mA/cm<2>, degrading is conducted under the conditions, electrolyte is collected, and the low-molecular-weight polysaccharide is obtained. The method provided by the invention is simple in process operation and efficient, saves time and facilitates scale production expanding; in addition, the reaction conditions are moderate, and pollution to the environment is small; and it is important that compared with acid degradation and a hydrogen peroxide degradation method, the polysaccharide degradation rate of an electric Fenton method is high, and the molecular weight range of the obtained low-molecular-weight polysaccharide is narrower.

The invention discloses a method for degrading organic sewage through cooperation of ionic liquid and hydrogen peroxide, belongs to the technical field of environment protection, and aims to determinethe optimal process condition of degrading aniline by hydrogen peroxide by changing the influence of factors such as the amount of added hydrogen peroxide, the pH value of a solution, the initial concentration of aniline wastewater, reaction time and the like on the aniline degradation effect and adopting an orthogonal test method. On the basis, the influence of changing the amount of the added ionic liquid on the aniline degradation effect is studied; the optimal process conditions for degrading aniline by the ionic liquid in cooperation with hydrogen peroxide are determined as follows: theconcentration of the ionic liquid is 0.6 g/L, the addition amount of hydrogen peroxide is 0.3 mL, the time is 10 min, the pH value is 6, the initial concentration of aniline wastewater is 30 mg/L, theroom temperature is about 18 DEG C, and the degradation rate is 96.2%. Finally, it is found that the degradation rate of the ionic liquid in cooperation with hydrogen peroxide is high, and the treated aniline sewage reaches the national first-grade discharge standard.

The invention discloses a supported Pd catalyst for directly synthesizing hydrogen peroxide and a preparation method thereof, and the preparation method comprises the following steps: 1) dissolving a Pd precursor in deionized water to form a metal precursor solution; 2) dissolving the carrier powder in deionized water to form a carrier suspension; 3) performing ultrasonic dispersion on the metal precursor solution and the carrier suspension, and fully and uniformly stirring; 4) dropwise adding the carrier suspension into the metal precursor solution, and stirring to uniformly load the metal precursor on the carrier to obtain an impregnation liquid; (5) separating the steeping liquor, carrying out vacuum drying treatment, and grinding into powder; and 6) calcining the ground powder in static air, and cooling to room temperature to obtain the supported monometal Pd catalyst. The Pd catalyst prepared according to the method is good in particle dispersity and uniform in size, and can achieve the effect of inhibiting the subsequent hydrogen peroxide degradation side reaction in the reaction of directly synthesizing hydrogen peroxide from hydrogen and oxygen.