54 results about "Periodic acid" patented technology

The invention relates to the technical field of biomedicine, in particular to a preparation method of oxidized sodium hyaluronate. The preparation method of the oxidized sodium hyaluronate comprises the following steps: adding sodium hyaluronate into water, then adding a solution containing sodium periodate to carry out an oxidation reaction, adding ethylene glycol to terminate the reaction, and removing impurities, thereby obtaining the oxidized sodium hyaluronate. The molar ratio of the sodium hyaluronate to the sodium periodate is 1: (0.15-3.6). The method has the advantages of high yield and stable process.

A composition contains a periodic acid compound selected from the group consisting of a periodic acid and a salt thereof, an amine compound that is a specific compound represented by Formula (1) or a salt thereof, and water.

The present disclosure relates to the synthesis of Vitamin K2 bearing varying prenyl side chains. The synthesis comprises the reaction of phenyl sulfone of tert-butyl dimethyl silyl (TBDMS) protected mono prenyl menadiol with prenyl halides bearing varying prenyl units in the presence of the phase transfer catalyst followed by reductive desulphonation to yield TBDMS ether of Vitamin K2. The TBDMS ether is then oxidized in the presence of chromium trioxide and periodic acid to yield the corresponding Vitamin K2.

The present application relates to a kind of trace nitrogen oxide reinforced UVB / high iodate degradation flame retardant intermediate method, comprising the following steps: respectively, an appropriate amount of high iodate and ACNHTEMPO are sequentially added into DOPO containing wastewater, the pH of mixed solution is adjusted with phosphate buffer solution, after being fully stirred, UV irradiation is carried out for a period of time, the degradation of organic phosphorus flame retardant intermediate DOPO can be realized.The present application method utilizes potassium periodate under the irradiation of ultraviolet light, activates ACNHTEMPO to speed up electron transfer rate, substantially improves the degradation efficiency of pollutant, and the pH is widely applicable.Solve the defect that most advanced oxidation technology needs to be carried out in acidic conditions;In addition, the present method is simple to operate, uses trace activator, does not produce secondary pollution, can provide new perspective for organic wastewater treatment field.

The present application relates to a kind of 1D / 2D double heterojunction catalyst and its preparation method and its application in photo-assisted high iodate activation degradation bisphenol A.The preparation method of the present application: concentrated hydrochloric acid solution and LiF are mixed, Ti3AlC2 is added, heated reaction, solid-liquid separation is taken solid phase, after washing to neutral, dispersed in ethanol, to obtain MXene ethanol solution;Cerium source aqueous solution is added to MXene ethanol solution and mixed in liquid nitrogen, to obtain mixed solution;Organic ligand, ethanol and pure water are mixed to obtain mixed solution, the mixed solution and mixed solution are mixed and heated, solid-liquid separation is taken precipitate, freeze-drying is obtained powder;The obtained powder is heated and calcined under inert atmosphere, to obtain 1D / 2D double heterojunction catalyst.The present application effectively inhibits photo-generated electron hole recombination by constructing double heterojunction, while realizing ultrafast electron transfer, to enhance oxidation, realizes the high-efficiency photocatalytic activity of "1+1>2".

The invention belongs to the technical field of radioactive waste treatment, and discloses a ceramic solidified body for synergistically solidifying radioactive iodine and cesium as well as a preparation method and application of the ceramic solidified body. The chemical formula of the ceramic solidified body is (Cs2xBa2-2x) (AgyNa1-y) IO6, x is equal to 0.1-0.9, y is equal to 0.1-0.9, and the ceramic solidified body is prepared by mixing silver iodide, barium hydroxide, sodium periodate and cesium carbonate, carrying out dry pressing molding under 20-60 MPa to obtain a rough blank, sintering at 500-700 DEG C, carrying out cold sintering at 200-300 DEG C, and finally annealing at 500-600 DEG C. The curing amount of iodine in the ceramic cured body is 2.4-20 wt%, the curing amount of cesium is 4-46 wt%, and the ceramic cured body has excellent chemical stability and is suitable for curing radioactive iodine and cesium and long-term geological treatment.

The invention provides compositions useful in the etching of polysilicon in the presence of silicon oxide and silicon nitride. The compositions comprise choline hydroxide, an oxidizing agent such as periodic acid, and optionally a surfactant, and are useful in the etching of polysilicon in general, and in particular in both the operation of polysilicon trim as well as polysilicon exhume. The utilization of an added oxidizing agent was found to reduce selectivity of silicon etching based on the silicon crystal orientation, which was found to reduce roughness and the presence of residual silicon residues, such as silicon (111) residues after the etching step.

The present invention provides a composition having excellent Ru removability, a method for treating an object to be treated using the composition, and a method for manufacturing a semiconductor device. The composition according to the embodiment of the present invention includes periodic acid or a salt thereof, a quaternary ammonium salt, at least one ionic surfactant selected from the group consisting of an anionic surfactant, a cationic surfactant, and an amphoteric surfactant, and a nonionic surfactant.

The invention belongs to the technical field of iodine removal of light salt brine, and particularly relates to a method for removing high-valence iodine in ionic membrane caustic soda light salt brine. Comprising the following steps: (1) adding a pH regulator and sodium sulfite into light salt brine, regulating the pH to 1-3, stirring until the reaction is completed, and carrying out primary adsorption deiodination by adopting a composite adsorbent to obtain light salt brine 1; and (2) adding a pH regulator and hydrogen peroxide into the light salt brine 1, regulating the pH value to 1-2, stirring until the reaction is completed, and carrying out secondary adsorption by adopting a composite adsorbent to remove iodine, thereby obtaining the deiodinated light salt brine. According to the removal method disclosed by the invention, high-valence iodine such as periodate and iodate in the light salt brine is converted into low-valence iodine such as iodate and iodide ions by utilizing the reducibility of sodium sulfite and the oxidation-reduction property of hydrogen peroxide in the coexistence of iodide ions and iodate, and then is further converted into simple substance iodine, and the simple substance iodine is efficiently removed by utilizing a composite adsorbent; the process is simple, the cost is low, the removal rate is high, and the removal effect is good.

The invention relates to the fields of chemistry and chemical engineering, organic synthesis and medicinal chemistry, in particular to a method for synthesizing 5-bromo-2-chlorobenzoic acid by adopting a microchannel reaction device. The method comprises the following steps: I, mixing 2-chlorobenzoic acid and sulfuric acid to obtain a reaction solution A; mixing bromine, sodium periodate, liquid organic acid and water to obtain a reaction solution B; and II, feeding the reaction liquid A and the reaction liquid B into a micro mixer of a micro-channel reaction device for mixing, then feeding the mixture into a micro reactor of the micro-channel reaction device for contact reaction, and carrying out post-treatment on contact reaction effluent to obtain the 5-bromo-2-chlorobenzoic acid. The method has the advantages of high product selectivity, high yield, high purity, convenient process, low production cost, and less by-product and three-waste pollution.

The invention discloses a high-polysaccharide dendrobium officinale variety germination period directional screening cultivation method, and belongs to the technical field of tissue culture. The invention provides a high-polysaccharide dendrobium officinale variety germination period directional screening cultivation method aiming at the problems that existing dendrobium officinale germplasm is mixed and the polysaccharide content is unstable. According to the method, the concentration of a periodate solution adopted for acidolysis treatment is remarkably reduced, the acidolysis time is shortened, a chromogenic reaction is achieved outside the protocorm, the situation that epidermal cells of the protocorm are excessively damaged and a coloring agent enters the protocorm to cause tissue structure change is avoided, and it is guaranteed that the structure of dendrobium officinale is complete and the shape of dendrobium officinale is stable; meanwhile, the dyeing time is shortened, rapid and lossless identification of the dendrobium officinale high-polysaccharide germplasm in the protocorm stage is achieved, the breeding period is remarkably shortened, and the screening accuracy and efficiency are improved. The cultivated high-polysaccharide dendrobium officinale variety shows consistency and stability in the aspects of polysaccharide content and agronomic traits.

The present invention provides a deodorant which is highly safe, easy to use in ordinary households, and has a sufficient deodorizing effect on various odors. The deodorant of the present invention is a solution formed by adding amino acids such as glycine, alanine, phenylalanine, sarcosine, threonine, arginine, and glutamic acid; zinc compounds such as zinc carbonate and zinc oxide; and iodine compounds such as iodine pentoxide, iodic acid, periodic acid, iodous acid, hypoiodous acid, iodates, periodates, iodites, and hypoiodites to an aqueous solvent such as water, and mixing them.

A chemical solution, which demonstrates excellent etching performance for transition metal-containing substances and has excellent defect inhibition performance, a method for manufacturing the chemical solution, and a method for treating a substrate. The chemical solution according to an embodiment includes one or more kinds of periodic acids selected from the group consisting of a periodic acid and a salt thereof, one or more kinds of first metal components selected from the group consisting of Ti and Zr, and water. In a case where the chemical solution includes one kind of first metal component, a content of the one kind of first metal component is 1 ppt by mass to 100 ppm by mass with respect to a total mass of the periodic acids. In a case where the chemical solution includes two kinds of first metal components, a content of both the two kinds of first metal components is equal to or smaller than 100 ppm by mass with respect to the total mass of the periodic acids, and a content of at least one of the two kinds of first metal components is equal to or greater than 1 ppt by mass with respect to the total mass of the periodic acids.

The invention provides a method for removing trace iodine in light salt brine produced by using an ionic membrane, which comprises the following steps: adding a pH regulator and a ferrous reducing agent into the light salt brine, regulating the pH value of the light salt brine to 1-4.5, adding an excessive amount of the ferrous reducing agent, and stirring until the reaction is completed; and adsorbing and removing iodine in the light salt brine after the reaction is completed by adopting a composite adsorbent to obtain the light salt brine after the iodine removal. According to the removal method, iodide, iodate and periodate in the light salt brine are converted into elemental iodine to be removed by utilizing the reducibility of Fe < 2 + > and the oxidizability of the product Fe < 3 + >, the problem of over-reduction or over-oxidation does not exist, the process is simple, the cost is low, the removal rate is high, and the removal effect is good.

A method for treating an object to be treated, the method including a step of bringing a boron-containing substance removal solution containing orthoperiodic acid and water into contact with an object to be treated having a boron-containing substance to remove the boron-containing substance. Further, a removal liquid for removing a boron-containing substance from an object to be treated having a boron-containing substance, the removal liquid containing positive periodic acid and water.

This scheme discloses a method for adsorbing cadmium ions in the field of heavy metal adsorption technology, specifically: using acylhydrazone-sodium alginate-Ca 2+ Composite adsorbent for heavy metal Cd 2+ Adsorption occurs, wherein the acylhydrazone-sodium alginate-Ca 2+ The composite adsorbent is prepared by reacting salicylhydrazine with sodium hydroxide after alkalization and oxidation with sodium periodate to form a salicylhydrazone compound, which is then cross-linked with sodium alginate. The method described in this application can simultaneously reduce the amount of distiller's grains and the heavy metal Cd. 2+ Pollution.

The application discloses a method for removing odorants in water by using an ozone / potassium periodate homogeneous phase, which comprises adding ozone (O3) and potassium periodate (IO4 ‑ ) into water containing odorants; adjusting the pH value of the water to 6.0-8.0; and reacting for 3-10 minutes at 0-35 DEG C; wherein the molar ratio of O3 to IO4 ‑ is 1:2-10:1, the ozone dosage is 2.0-8.0 mg / L, and the potassium periodate dosage is 3.0-15.0 mg / L. The method can generate high-activity free radicals (·OH, IO3·, etc.) by using a homogeneous phase catalytic system, and thus realizes efficient degradation of the odorants.

To provide a method capable of a wet etching silicon at a high speed without etching an insulating film such as silicon dioxide when manufacturing a semiconductor device or the like.SOLUTION: A Si surface is selectively etched by preparing a composition containing an organic alkali compound such as quaternary ammonium hydroxide, orthoperiodic acid or a salt thereof, and water as an etching solution, having a pH of 12.5 or more, and containing no fluoride ion and no metal, and bringing the etching composition into contact with a substrate having a silicon surface and at least one surface selected from a silicon dioxide surface and a silicon nitride surface. In the etching composition containing the ortho-periodic acid (salt), silicon dioxide and silicon nitride are not substantially etched, while silicon is etched at a higher speed than in the related arts, so that productivity in manufacturing a semiconductor device or the like is improved.SELECTED DRAWING: None

The invention discloses a ferrate composite coagulant and a preparation method thereof, and the ferrate composite coagulant comprises the following components in percentage by mass: 5%-70% of ferrate, 5%-30% of ferric trichloride, 2%-20% of periodate, 5%-40% of beta-cyclodextrin and 1%-10% of alkaline auxiliary materials. The preparation method comprises the following steps: adding beta-cyclodextrin into a KOH solution, heating, adding ferrate, and carrying out primary inclusion to obtain an intermediate product; adding ferric trichloride, periodate and auxiliary materials into the intermediate product, and then adding into a heated saturated aqueous solution of beta-cyclodextrin for secondary inclusion. Periodate is adopted as a stabilizer, so that the ion concentration of decomposition reaction products such as K < + > can be increased, the decomposition reaction of ferrate is inhibited, and the stability of the solution is improved. The composite coagulant can be stably stored at normal temperature, is slowly and stably released in an aqueous solution, can keep high strength for a long time, and has good flocculation performance in water treatment.

A method for etching a metal barrier layer and a metal layer, and a method for manufacturing a semiconductor device, are disclosed. The method includes: forming a metal barrier layer and a metal layer on a substrate; and etching the metal barrier layer and the metal layer using an etching composition. The etching composition may include: an oxidant selected from nitric acid, bromic acid, iodic acid, perchloric acid, perbromic acid, periodic acid, sulfuric acid, methanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid, or combinations thereof; a metal etching inhibitor, including a compound represented by chemical formula 1 as shown in the specification; and a metal oxide solubilizer selected from phosphoric acid, phosphates, carboxylic acids having 3 to 20 carbon atoms, or combinations thereof.

The invention provides a selective etching solution for metal molybdenum, which comprises the following components in percentage by mass: 51%-69% of electronic-grade phosphoric acid, 13%-28% of electronic-grade acetic acid, 2.2%-3.8% of electronic-grade nitric acid, 0.04%-0.065% of periodic acid, 0.03%-0.09% of an organic amine additive, 0.2%-3.5% of a hafnium oxide etching inhibitor and the balance of deionized water. The etching liquid can effectively etch a metal molybdenum deposition layer on the premise that the hafnium oxide etching rate (ER) is smaller than or equal to 0.05 nm / min, no residues exist on the surface of the metal molybdenum after etching, and the metal molybdenum and the hafnium oxide have the high selection ratio.

The application discloses a high-selectivity copper-lead separation combined inhibitor and application thereof, and belongs to the technical field of mineral processing and non-ferrous metal flotation. The components of the combined inhibitor include sodium periodate and mercaptosuccinic acid, and the mass ratio of the sodium periodate to the mercaptosuccinic acid is 1:3-1:7. The combined inhibitor is composed of the sodium periodate and the mercaptosuccinic acid, is used in the process of separating copper and lead from a lead sulfide ore, and is used for accurately and effectively inhibiting galena, thereby reducing the influence of the combined inhibitor on chalcopyrite flotation, and finally making the lead sulfide ore have excellent flotation separation effect and obtaining high-grade copper and lead concentrates.

The invention discloses a preparation method of an iodine-doped titanium dioxide visible light photocatalyst, titanium potassium oxalate is selected as a titanium source, sodium periodate is taken as an oxidant and an iodine source, reaction is carried out under an acidic condition, and the iodine-doped titanium dioxide visible light photocatalyst is prepared by adopting a hydrothermal method, so that the light response range of titanium dioxide is widened; the photocatalyst has good visible light photocatalytic performance, and the photocatalytic degradation rate is higher than 80% after the photocatalyst is recycled for 3 times; the catalytic performance of the photocatalyst under different sodium periodate addition amounts is explored, the catalytic performance of the iodine-doped titanium dioxide visible light photocatalyst with the optimal addition amount after different trapping agents are added is obtained, the I-TiO2 photocatalytic reaction mechanism is disclosed, and the I-TiO2 visible light photocatalyst has a good application prospect.

This invention proposes a method for determining the glycerol content in collagen colloids. It utilizes the oxidation of free glycerol by periodic acid to formaldehyde, which then undergoes a Hantzsch reaction with two molecules of acetylacetone in the presence of ammonium acetate. This is the first time this method has been applied to the determination of glycerol content in collagen colloids, and it is automated using an automated analyzer. This method can be used to detect collagen colloidal materials. The sample pretreatment primarily utilizes the isoelectric point precipitation property of collagen. The pH of the collagen solution sample is pre-adjusted to approximately 5.0, close to the isoelectric point of collagen colloids. The precipitation of proteins clarifies the solution and facilitates the release of glycerol into the solution, resulting in more accurate measurement results. This invention offers advantages such as simplicity, speed, accuracy, and safety in determining the glycerol content in collagen colloids.

The application discloses polyellagic acid nanofibers and a preparation method and application thereof. The preparation method of the polyellagic acid nanofiber is as follows: ellagic acid is used as raw material, an alkaline aqueous solution is used as a solvent, and sodium periodate is used as an oxidant, and the polyellagic acid nanofiber is prepared through reaction. The method is simple and easy to implement, the prepared polyellagic acid is in the form of nanofiber, has good water solubility, a large specific surface area and a stronger free radical scavenging capacity.

This invention belongs to the technical field of organic synthesis and discloses a method for preparing benzo[i]iodo[i]oxapentane reagent. The method involves adding periodic acid or periodate as an oxidant, along with an o-iodobenzyl alcohol compound, to an aqueous acetic acid solution. Heating causes a redox reaction, followed by recrystallization or slurrying to obtain the product, benzo[i]iodo[i]oxapentane reagent. R1 is selected from methyl or trifluoromethyl; R2 is selected from hydrogen, halogen, or methyl; R3 is selected from hydrogen or methyl; and periodate is selected from sodium periodate, potassium periodate, tetrabutylammonium potassium periodate, or lithium periodate. This invention provides a one-step, efficient method for preparing benzo[i]iodo[i]oxapentane reagent using periodic acid / salt, with simple steps and easily separable reaction products. The redox reaction equation is as follows:

The present application relates to a kind of visible light combined humic acid activation periodate removal bisphenol A in water method, comprising the following steps: respectively, appropriate amount of humic acid and periodate are sequentially added in the wastewater containing bisphenol A pollution, after being fully stirred and mixed, visible light is irradiated for a period of time, bisphenol A degradation can be realized.The method of the present application utilizes the excited state humic acid formed under the irradiation of visible light to accelerate the electron transfer between humic acid and periodate, thereby efficiently activating periodate to form active substance for bisphenol A degradation, the pH range is wider, solves the defects that most advanced oxidation technologies need to be carried out under acidic conditions;In addition, since visible light and humic acid are ubiquitous in nature, the method of the present application also has the advantages of simple operation, low cost and no secondary pollution, etc., which can provide a new perspective for the field of organic wastewater treatment.

A method for preparing 1,6-hexanedial, the obtained product, and a reaction system, and relate to the technical field of fine chemical synthesis. The method comprises: mixing cyclohexene with a solvent, introducing a gas containing ozone, and reacting cyclohexene with ozone to obtain 1,6-hexanedial under normal pressure and a temperature of 70-20°C; the solvent contains dimethyl sulfoxide and water. The present invention utilizes the high selectivity of the green oxidant ozone to olefin double bonds, and selectively oxidizes cyclohexene in a mixed solvent system to prepare 1,6-hexanedial in one step. The present invention does not need to introduce a precious metal complex and a solid catalyst such as sodium periodate into the reaction system, and the preparation method is simple in process, green, environmentally friendly and pollution-free.

A semiconductor treatment liquid for removing ruthenium silicide from a substrate containing ruthenium silicide, the semiconductor treatment liquid for ruthenium silicide removal containing (i) at least one selected from the group consisting of hypochlorous acid, hypobromous acid, periodic acid, and ions thereof, (ii) at least one selected from the group consisting of hydrogen fluoride and a fluoride ion, and (iii) an onium ion.

The present invention relates to the technical field of renal puncture staining control, and discloses a quality control system for improving the accuracy of special staining of renal puncture, including a data acquisition module, a data processing module, a detection module, and a monitoring module; wherein: the data acquisition module is used to collect reference sample information and target sample information; the data processing module is used to calculate the reference staining parameters of the sample to be stained, and adjust the concentration of periodic acid oxidation solution based on the tissue information of the reference stained sample and the sample to be stained; the detection module is used to detect the staining progress index of the sample to be stained during the staining process; the monitoring module determines whether the staining target state is achieved based on the staining progress index; the monitoring module is also used to time each staining link and give an end reminder during the staining process; the present invention realizes the real-time monitoring of the staining process and improves the accuracy and reliability of staining.