23 results about "Periodic acid" patented technology

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 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 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.

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

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 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.

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.

The invention discloses a finasteride intermediate as well as a preparation method and application thereof, and belongs to the technical field of medicine synthesis. The preparation method of the finasteride intermediate comprises the following steps: mixing progesterone and an organic solvent, continuously introducing ozone at-20 DEG C to-10 DEG C to obtain an intermediate state I, dropwise adding peroxide at-10 DEG C or below, dropwise adding a sodium hydroxide solution, heating to 15-25 DEG C, and reacting to obtain the finasteride intermediate. In addition, the invention also provides the finasteride intermediate which is prepared by the preparation method. In addition, the invention also provides an application of the finasteride intermediate in preparation of finasteride. According to the method, sodium periodate does not need to be used, 4-position double bonds can be cut off through oxidation by adding a small amount of peroxide and a sodium hydroxide solution, the finasteride intermediate is obtained, and the green chemical requirement is met.

The invention provides a method for rapidly determining the content of triethylene glycol in refined polyethylene glycol based on redox titration, which comprises the following steps: weighing two polyethylene glycol samples with the same mass, selectively oxidizing ethylene glycol in one of the polyethylene glycol samples by utilizing periodic acid, and determining the content of ethylene glycol in combination with redox titration; the total hydroxyl value of the other part is measured, and the content of triethylene glycol is calculated through difference derivation according to the hydroxyl value characteristics of ethylene glycol, triethylene glycol and polyethylene glycol. The method does not need a large instrument, is simple and convenient to operate, consumes short time and is suitable for rapidly detecting the content of triethylene glycol in refined polyethylene glycol.

The application provides a double perovskite structure primary explosive and a synthesis method, and the synthesis method specifically comprises the following steps: step one, a certain amount of triethylenediamine dihydrochloride solid and a certain amount of ammonium chloride powder are dissolved in a certain amount of water to prepare a mixed solution of triethylenediamine dihydrochloride and ammonium chloride; step two, a certain amount of sodium periodate powder is dissolved in a certain amount of water to prepare a sodium periodate aqueous solution; step three, the sodium periodate aqueous solution is added into the mixed solution of triethylenediamine dihydrochloride and ammonium chloride at a certain rotating speed under room temperature, and mixing is carried out for a period of time; step four, after continuous stirring for a period of time, colorless transparent to white or off-white crystals are obtained through filtration; step five, the white or off-white crystals are washed by ice water or 95% volume fraction of anhydrous ethanol or acetonitrile, and then dried, so that the primary explosive is obtained.

The application discloses a method for degrading pollutants by using a chromium-potassium periodate system, and comprises the following steps: adding chromium sulfate into ultrapure water while stirring, and adjusting the pH of the solution to 8-11; under the stirring state, adding potassium periodate into the solution to form a chromium-potassium periodate system solution; and adding the chromium-potassium periodate system solution into a solution of pollutants to be degraded to perform reaction and degrade the pollutants. The method can realize efficient oxidation and degradation of organic pollutants in water under the conditions of low catalyst consumption and proper pH. The application breaks through the pH condition of chromium, and makes the application of chromium not limited to the low pH field, avoids the generation of toxic by-product Cr(VI), and realizes the cleanness and environmental protection of the process.

The application discloses a method for detecting ascorbic acid in urine based on nitrogen and boron co-doped fluorescent carbon dots, and belongs to the field of analysis and detection. The carbon dots are prepared by taking citric acid, ethylenediamine and boric acid as precursors, and the fluorescent quantum yield of the carbon dots reaches 84.5%. The high iodine oxide oxidizes the surface functional groups of the carbon dots to generate non-fluorescent groups, so that the fluorescence of the carbon dots is quenched. The ascorbic acid preferentially reacts with the high iodine oxide in an oxidation-reduction reaction, thereby inhibiting the fluorescence quenching effect of the high iodine oxide, and the inhibition degree is related to the concentration of the ascorbic acid. Based on this, a relationship curve between the concentration of the ascorbic acid and the degree of inhibition of fluorescence quenching is constructed, so that the quantitative detection of the concentration of the ascorbic acid in urine is realized, and the detection limit is as low as 0.01 nmol / L. The application first uses an "inhibition" type fluorescence sensor to quantitatively detect the ascorbic acid, and is simple, safe, efficient and suitable for routine analysis.