458 results about "H2O2 - Hydrogen peroxide" patented technology

A method of sterilizing an article by sequentially exposing the article to hydrogen peroxide and ozone is disclosed. The article is exposed under vacuum first to an evaporated aqueous solution of hydrogen peroxide and subsequently to an ozone containing gas. The exposure is carried out without reducing the water vapor content of the sterilization atmosphere, the water vapor content being derived from the aqueous solvent of the hydrogen peroxide solution and from the decomposition of the hydrogen peroxide into water and oxygen. The complete sterilization process is carried out while the chamber remains sealed and without removal of any component of the sterilization atmosphere. For this purpose, the chamber is initially evacuated to a first vacuum pressure sufficient to cause evaporation of the aqueous hydrogen peroxide at the temperature of the chamber atmosphere. The chamber is then sealed for the remainder of the sterilization process and during all sterilant injection cycles. Keeping the chamber sealed and maintaining the hydrogen peroxide and its decomposition products in the chamber for the subsequent ozone sterilization step results in a synergistic increase in the sterilization efficiency and allows for the use of much lower sterilant amounts and sterilization cycle times than would be expected from using hydrogen peroxide and ozone in combination.

Dental bleaching systems that include a bleaching component and a neutralizing component which, when mixed together, yield a mixed composition having a desired bleaching activity and viscosity. The bleaching composition includes a suitable bleaching agent, such as aqueous hydrogen peroxide, in a concentration of about 3% to about 95% by weight of the bleaching composition component. The neutralizing component includes a particulate base dispersed within a stable gel that includes at least one polymeric thickening agent. The neutralizing component is substantially water-free to prevent destruction of the gelling capability of the thickening agent by the base. The particulate base may include oxides, hydroxides or carbonates of alkali metals or alkaline earth metals. Maintaining the bleaching agent and neutralizing agent in separate components provides increased stability during storage and transport.

A method of decontaminating articles, comprising the steps of:(a) moving a plurality of articles having a known temperature along a first path;(b) conveying a carrier gas along a second path that includes an elongated plenum, the second path intersecting the first path downstream from the plenum;(c) heating the carrier gas to a temperature of at least about 105° C. at a location upstream of the plenum;(d) introducing into the carrier gas in the plenum an atomized mist of a liquid hydrogen peroxide of known concentration; and(e) controlling the following:(1) the volumetric flow of carrier gas along the second path;(2) the volume of hydrogen peroxide introduced into the carrier gas; and(3) the temperature of the carrier gas introduced into the plenum, such that the concentration of the vaporized hydrogen peroxide in the carrier gas where the first path intersects the second path has a dew point temperature below the known temperature of the articles.

The present invention provides an assembly for the preparation of a medical device having a porous coating comprising hydrogen peroxide. Particularly interesting medical devices are catheters (such as urinary catheters), endoscopes, laryngoscopes, tubes for feeding, tubes for drainage, guide wires, condoms, urisheaths, barrier coatings e.g. for gloves, stents and other implants, extra corporeal blood conduits, membranes e.g. for dialysis, blood filters, devices for circulatory assistance, dressings for wound care, and ostomy bags. The coating is in particular a hydrophilic coating formed from cross-linked polyvinylpyrrolidone. In one embodiment, the assembly holds a dry catheter element in one compartment of a package and an aqueous hydrogen peroxide solution in another compartment. The solution may also comprise stabilizers, e.g. chelators, and osmolality increasing agents. The catheter for insertion in the urethra is useful for the treatment, alleviation or prophylaxis of microbial infections such as urinary tract infections (UTI).

The invention relates to an etching solution composition, prepared from the following components: 4-25wt% of hydrogen peroxide, 0.01-10wt% of an etching inhibitor, 0.01-10wt% of a chelating agent, 0.01-3wt% of etching additives, 0.01-10wt% of a hydrogen peroxide stabilizer and the balance of water, wherein the total weight of the composition is 100%. The invention also provides a conductive metal film etching method. The method comprises the step of enabling the etching solution composition to be contacted with a conductive metal film, wherein an upper layer metal film is formed by at least one of aluminum, aluminum alloy, copper and copper alloy, and a lower layer metal film is formed by molybdenum and / or titanium.

The corrosion resistance of a metal substrate surface treated with an acidic aqueous composition to form a conversion coating is improved by first contacting the surface with an oxidizing acidic pre-rinse, such as an aqueous solution of nitric acid and hydrogen peroxide, or nitric acid and hydrofluoric acid, or Fe+3 cations and hydrofluoric acid.

The invention provides a device and method for smoke simultaneous desulfurization and denitrification based on hydrogen peroxide catalytic oxidation (H2O2). The H2O2 is sprayed into an H2O2 catalytic decomposition device through an injection pump and reacts with catalysts, a large amount of active matter is generated, the active matter is injected into a smoke channel along with a bypass air flow from an air blower in a blowing mode and reacts with sulfur dioxide (SO2) and oxynitride (NOX) in smoke to generate sulfuric acid and nitric acid. The sulfuric acid, the nitric acid and pollutants left in the smoke enter an ammonia absorption tower, and finally two kinds of important chemical fertilizer, namely ammonium sulfate and ammonium nitrate are generated. The device and method are suitable for smoke simultaneous desulfurization and denitrification in large, medium and small size boiler and reconstruction application of built combustion equipment, and the NOX and SO2 can be removed at the same time.

The invention discloses a mercury-ion detection method simulating peroxidase based on nano platinum and a kit. After the specificity interaction of the nano platinum and mercury ions, the inhibition variation of the activity of the perioxidase is simulated, hydrogen peroxide is catalyzed by the nano platinum to oxidize 3, 3', 5, 5'-TMB HCL to achieve color developing. The invention provides a novel rapid, simple and ultrasensitive mercury ion detection method. The nano platinum used in the detection method is simple to prepare and easy to obtain, and visualized and convenient analysis on the mercury ions can be realized. The detection method has the advantages of simplicity in operation, short detection time, high sensitivity, high specificity and the like and is easy to popularize and use.

The invention discloses a method for quickly determining residual hydrogen peroxide. According to the method, residual hydrogen peroxide in a to-be-determined sample is quickly determined by detection paper; the method capable of quickly detecting the content of residual peracetic acid in the sample on site is good in stability, easy and simple to operate, economical, practical, short in response time and high in sensitivity; and the lowest detected content of hydrogen peroxide is 0.5mg / L. In addition, the method can be widely applied to the industries of food, daily chemical and medical treatment, and can quickly and effectively monitor the content of residual hydrogen peroxide in various disinfected or bleached samples.

A decontamination system for decontaminating a region with a vaporized decontaminant, such as vaporized hydrogen peroxide. The concentration of the vaporized decontaminant within the region is modified in response to operating conditions. The decontamination system adjusts the concentration of the vaporized decontaminant in response to the monitored saturation concentration of the decontaminant, thereby preventing condensation of the vaporized decontaminant during a decontamination cycle. The decontamination system also adjusts the concentration of the vaporized decontaminant in order to minimize the time required to complete a successful decontamination operation.

A hydrogen peroxide vapor generation unit (10) receives hydrogen peroxide and water solution at an interface (20) and interconnects with an air dryer (14) by way of nipples (72, 92). In one embodiment, the dryer includes a clamping assembly (42) which is latched (74, 94) with the nipples and which receives a disposable desiccant cartridge (40). In an alternate embodiment, a reusable desiccant cartridge (40′) is connected directly to the nipples (72, 92). When the desiccant cartridge (40′) is saturated, it is removed and placed in a regenerator unit (120). A regenerated cartridge is installed in its place.

A method and accompanying apparatus that allows high concentrations of hydrogen peroxide for tooth whitening by use of an aerosol spray. The aerosol spray may be delivered through a mouthpiece that will direct the spray onto the teeth while inhibiting any escape of the spray to the lips and outside the moth. Also, in combination with antiplaque formulations, enhanced tooth whitening is effected.

The invention discloses a stepped method for detecting the concentration of a hydrogen peroxide solution. The stepped method includes the following steps that 1, a photothermal conversion material reacting with hydrogen peroxide is used for modifying a nanometer material containing a rare earth element, so that a functional rare earth nanometer material is obtained; 2, a series of hydrogen peroxide solution with the standard concentration reacts with the functional rare earth nanometer material to obtain a series of mixed solution, the luminous intensity, ultraviolet-visible light absorption intensity and photo-thermal heating temperature of the mixed solution are detected, and a standard curve of the luminous intensity, ultraviolet-light absorption intensity, heating temperature and concentration is drawn; 3, the hydrogen peroxide solution with unknown concentration reacts with the functional rare earth nanometer material to obtain a mixed solution, a detecting mode is determined, corresponding data is determined, and the concentration can be obtained through comparison with the standard curve. The detection limit is effectively lowered, and meanwhile the linear detection range is promoted. The material is simple, an instrument is low in price, and the stepped method can be used for detecting foods, medicine, living body samples and other samples.

The invention relates to a magnetic graphene enzyme-mimicking property-based acetylcholine visual-detection method, belonging to the technical field of biosensing. A hydrothermal method is used for synthesizing Fe3O4 / rGO by one step, H2O2 (hydrogen peroxide) is catalyzed to oxidize a substrate TMB (tetramethylabenzidine) to generate blue by utilizing the peroxidase-like property of the Fe3O4 / rGO, and the characteristic absorption intensity of an oxidation product of the TMB at the wavelength of 652nm is detected to realize the detection of hydrogen peroxide; furthermore, the H2O2 can be catalyzed to oxidize and convert the colorless TMB into a corresponding blue product based on the Fe3O4 / rGO, and the blue product is combined with acetyl choline to decompose H2O2 in the presence of both acetylcholinesterase and choline oxidase, and a novel acetylcholine visual-sensing method is established. The invention aims to provide an acetylcholine colorimetric detection method, and according to the method, the operation is convenient and flexible, the detection cost is low, the sensitivity is high, and instruments and equipment are simple.

A diesel desulfurization method has various steps including: implementing a modified oxidative desulfurization (UAOD) process. The UAOD has the steps of: mixing diesel fuel with room temperature ionic liquid, oxidant, phase transfer catalyst, and acid catalyst in a tank in a mix; recycling the ionic liquid and recycling the acid catalyst in aqueous phase. A step is to move the sulfur from the diesel fuel in a fluidized bed reactor (FBR) having bed reactor material. The process can be improved with ultrasound during mixing, or a high shear mixer. The bed reactor is preferably acidic alumina for adsorbing oxidized sulfur. The oxidant is preferably hydrogen peroxide (H2O2). The acid catalyst is preferably a mixture of Acetic acid and Tri-fluoro acetic acid.

A diesel desulfurization method has various steps including: implementing a modified oxidative desulfurization (UAOD) process. The UAOD has the steps of: mixing diesel fuel with room temperature ionic liquid, oxidant, phase transfer catalyst, and acid catalyst in a tank in a mix; recycling the ionic liquid and recycling the acid catalyst in aqueous phase. A step is to move the sulfur from the diesel fuel in a fluidized bed reactor (FBR) having bed reactor material. The process can be improved with ultrasound during mixing, or a high shear mixer. The bed reactor is preferably acidic alumina for adsorbing oxidized sulfur. The oxidant is preferably hydrogen peroxide (H2O2). The acid catalyst is preferably a mixture of Acetic acid and Tri-fluoro acetic acid.

The invention discloses a preparation method and application of an electrochemical biosensor based on a nucleic acid-like CoA-Au(I) coordination polymer capable of simulating peroxidase character. The preparation method comprises the following specific steps: (1) dissolving graphene into an acetic acid buffer solution and ultrasonically dispersing in an ultrasonic cleaner to obtain graphene dispersion liquid; (2) evenly mixing coenzyme A, chloroauric acid and a phosphoric acid buffer solution in a PCR pipe, continuously oscillating to enable gold ions to be reduced and obtaining a CoA-Au(I) coordination polymer in room temperature; (3) electrolytically depositing graphene on a bare glassy carbon electrode and then dropwise adding a CoA-Au(I) coordination polymer solution to be used for detecting hydrogen peroxide and hydrogen peroxide concentration in a biological sample. The electrochemical biosensor has the advantages of good specificity, high flexibility, quick detection speed, accurate and reliable result and low cost.

The invention provides a novel high-efficiency multi-phase Fenton reaction system FeOxH2x-3-Fe / H2O2 / UVA used for degrading organic contaminant in water. Zero-valent iron powders sold in the market or prepared at home are calcined for 15-90 minutes at the low temperature of 150-400 DEG C and catalyses and degrades the organic contaminants with the existence of ultraviolet and hydrogen peroxide; after the step is repeated for 2-5 times, the zero-valent iron powders are filtrated, washed by water and dried for 1-5 hours at the temperature of 70-110 DEG C to gain the yellow FeOxH2x-3-Fe catalyst. The FeOxH2x-3-Fe material has an obvious core-shell structure; wherein, the iron oxide (FeOOH and Fe2O3) on the surface of the catalyst and the internal zero-valent iron form different redox couples which have the similar performance of galvanic cells. Under the illumination of the ultraviolet, the FeOxH2x-3-Fe can catalyse the hydrogen peroxide and degrade the organic contaminant with high-efficiency; furthermore, the catalyst can be magnetically recovered and have stability of circular utilization.

The invention relates to a configuration of an air diffusion cathode for efficiently producing hydrogen peroxide and a preparation method thereof. The method mainly comprises the following steps: coating a carbon fiber by using a mixed solution of polytetrafluoroethylene and carbon black, so as to prepare an air cathode sheet, and then assembling the air cathode sheet according to a certain configuration. The air diffusion cathode has good H2O2 yield and current efficiency, is low in requirements of air aeration quantity, convenient to run, small in energy consumption, low in price, and stable in property, selects a carbon fiber and a carbon black material, and has high practical application value.

The invention discloses a preparation method of a difunctional hydrogen peroxide non-enzymatic sensor built based on a two-dimensional composite material. The prepared sensor is easy to operate, convenient to carry, high in detection speed, low in cost and capable of being used for rapidly and sensitively detecting hydrogen peroxide in the field of daily production, life and the like.

The invention discloses an etching solution, an additive and a manufacturing method for metal layout wires. The etching solution is prepared from the following main components in percentage by weight:5-30% of hydrogen peroxide, 0.1-5% of a hydrogen peroxide stabilizer, 5-25% of a chelating agent, 0.1-1% of a surfactant, 0.1-5% of an inorganic acid oxidant, and the balance of deionized water, wherein the additive is added into the etching solution while the etching solution is repeatedly used. The etching solution is free of fluorides, is environmentally friendly, and has the advantages of being moderate in etching rate, proper in etching angle, small in line width loss, free of metal residues, and the like. The additive and the etching solution are combined for use, so that the service life of the etching solution can be greatly prolonged.

This invention discloses a method for preparing low-sulfur diesel oil (sulfur content is less than 50 ppm). The method comprises: (1) stirring hydrogenated or unhydrogenated diesel oil and a mixture of Q+[MWxOy]- emulsion catalyst and H2O2 aqueous solution, and reacting under mild conditions to convert organic sulfide in diesel oil into sulfone and / or sulfoxide to obtain oxidized diesel oil; (2) separating the catalyst from oxidized diesel oil, and recovering; (3) washing oxidized diesel oil with distilled water, and removing most of sulfone and / or sulfoxide with a polar solvent to obtain low-sulfur diesel oil (sulfur content is less than 50 ppm).

The invention relates to a method for testing hydrogen peroxide in a cell based on a horseradish peroxidase-attapulgite nanometer composite material; the method comprises the following steps: horseradish peroxidase is adsorbed on the surface of purified attapulgite so as to prepare the horseradish peroxidase-attapulgite nanometer composite material; a dispensing method is used for applying the composite material to the surface of a glassy carbon electrode so as to construct a horseradish peroxidase-attapulgite nanometer composite material biological sensor; the sensor is used as a working electrode; and a chronoamperometry is used for detecting H2O2 in the cell. The biological sensor adopted by the method for testing the hydrogen peroxide in the cell has good electrical catalytic activity on hydrogen peroxide, can be applied to the detection of H2O2 in the cell and has the advantages of fast response, wide linear range, low detection limit, good repeatability and the like; and a new electrochemistry method based on enzyme sensing for detecting H2O2 in the cell is established.

The invention discloses a method for detecting hydrogen peroxide by modifying a screen printing electrode by a persimmon tannin-graphene-Pt composite material. The method is characterized in that persimmon tannin is taken as a raw material, a one-step reduction method is used for directly preparing the persimmon tannin-graphene-Pt nano composite material, an electrodeposition technology is employed for depositing nano-gold on a surface of the screen printing electrode, the persimmon tannin-graphene-Pt nano composite material dropped on the electrode surface is absorbed to the surface of the screen printing electrode through electrostatic adsorption, adsorption of persimmon tannin on metal ions, large specific surface area of graphene, and high efficiency catalysis of nano Pt and catalysisof H2O2 are used, a H2O2 non-enzymatic sensor is constructed, and an electric current-time method is employed for timing current response detection of H2O2. A work curve is drafted according to a relation of current response of the sensor and H2O2 concentration, and quantitative determination of H2O2 is realized. The method has the advantages of good stability, high specificity, and easy, convenient and rapid operation.

The invention discloses a disinfectant for cleaning and disinfecting a hemodialysis machine. The disinfectant contains the following components by weight percent: 0.5%-1.0% of peracetic acid, 2.0%-5.0% of hydrogen peroxide, 0.1%-0.5% of pyridine-2-formic acid, 0.01%-0.05% of sodium citrate, 0.2%-2.0% of sodium dichloroisocyanurate, 0.05%-1.0% of sulfamic acid and the balance being water. A preparation technology of the disinfectant is simple, the disinfectant is convenient to use, the technological conditions are easy to achieve and the product stability is good.

The invention relates to a method for testing the lead content in copper by inductively coupled plasma emission spectrometry, which comprises: firstly, dissolving a copper sample in a proper amount of hydrochloric acid and hydrogen peroxide, and washing with 4 percent HCl till copper ions are removed completely; and secondly, preparing standard solution which is used for measuring a standard factor and a calibration factor. An analytic spectral line selected in analytic measurement is Cu222.778 (150) and Pb220.353 (152). In the invention, the instrument operation parameters are measurement conditions of infrared interferometer spectrometer (IRIS) inductively coupled plasma (ICP) whole-spectrum direct-reading spectrometer (from Thermo Electron), which are as follows: the integration time is 25 seconds for long waves and 5 seconds for short waves; the sample washing time is 30 seconds; the high-frequency output power is 1,150W; the atomization pressure is 20Psi; the auxiliary air flow is 0.5L / min; the pumping speed is 100rpm; and the atomizer position is 7mm. The invention has the advantage that the detection method has the characteristics of simplicity, convenience, quickness and accuracy and has high stability.

The invention discloses a manufacture method of a gold plated copper thermode and application of the thermode on a temperature-controllable H2O2 sensor, comprising manufacture of the gold plated copper thermode, formation of a G-quadruplex-hemin complex and a high-sensitivity detection method for hydrogen peroxide by an electrochemical sensor based on the thermode and the G-quadruplex-hemin complex. Based on the high-temperature resistance feature of G-quadruplex-hemin DNA (Deoxyribonucleic Acid) enzyme, electrochemical catalysis response of the hydrogen peroxide on the sensor increases gradually with temperature rising (0-50 degrees centigrade). The electrochemical hydrogen peroxide sensor based on the thermode and G-quadruplex-hemin DNA enzyme provided by the invention can be used in a wide temperature range, has high sensitivity and can realize rapid detection on hydrogen peroxide.

The invention discloses a hydrogen peroxide measurement method based on N-acetyl-L-cysteine-gold nanoclusters, and relates to a hydrogen peroxide measurement method which takes the gold nanoclusters protected by N-acetyl-L-cysteine as a fluorescent probe. The method is characterized in that the fluorescent light of the gold nanoclusters is quenched by utilizing hydroxyl radicals generated by catalyzing H2O2 through Fe<2+>, so that the characteristic of a fluorescence emission spectrum is changed, and the method can be used for detecting H2O2. Delta F650 and the concentration of H2O2 have a linear relation within the range of 0.044-6.66 micromole / L, and the limit of detection is 27 nmol / L. The method is high in sensitivity and good in reproducibility, and can be used for measuring H2O2 in food, industry, environment and a living system.

The present invention provides an etchant composition suitable for etching metals Cu / Mo, wherein the composition comprises 1 to 25 wt % of hydrogen peroxide on the basis of the total weight of the composition; 0.1 to 15 wt % of amino acid on the basis of the total weight of the composition; 0.1 to 15 wt % of a pH stabilizer on the basis of the total weight of the composition; 0.01 to 2 wt % of fluorine-containing acid on the basis of the total weight of the composition; 0.01 to 3 wt % of an acidic pH adjuster on the basis of the total weight of the composition; and an aqueous medium. The present invention also provides a process for etching metals Cu / Mo with the etchant composition of the present invention.

The invention relates to a controllable short-process preparation method of nano titanium dioxide, and belongs to the field of material preparation. The preparation method comprises the following steps that: (1) butyl titanate is added into a hydrogen peroxide solution in a water bath for reaction for 0-1200min at the water bath temperature of -5-40 DEG C to form light orange gel under a stirring condition; the molar ratio of Ti to H2O2 is 1:(2-30); and (2) isopyknic deionized water is added into the light orange gel for heating reflux to obtain a sediment; and the sediment is subjected to centrifugal separation, and dried below 120 DEG C or roasted at 400-700 DEG C for 30-240min to form nano titanium dioxide powder. With the adoption of the preparation method for preparing nano titanium dioxide, the preparation time can be shortened; reaction and gelling processes can be controlled; an external heating source is not required; a chemical agent can be utilized efficiently; the introduction of impurities can be reduced; prepared nano titanium dioxide has a good photocatalytic performance; and the method has a good market application prospect.