132 results about "Permanganate salt" patented technology

The invention discloses a method for removing iron impurities in regenerated aluminum alloy, and belongs to the field of non-ferrous metal regeneration, recovery and impurity removal. The method comprises the following steps: weighing an iron removal flux (25-45 wt.% of boron-containing potassium fluoride, 20-30 wt.% of sodium chloride and 20-35 wt.% of potassium chloride) according to the mass percentage, stirring, mixing and drying; according to the method, the aluminum scrap is put into the smelting furnace to be smelted, then the iron removal flux and the permanganate catalyst are added into the aluminum scrap melt, stirring and standing are carried out, the aluminum melt with the iron impurity element removed is obtained, the method does not affect the aluminum obtaining rate, meanwhile, the iron content is remarkably reduced, and the method is applied to aluminum ingots obtained through green regeneration smelting of the aluminum scrap and has the beneficial effects that the cost is low; the environment is not damaged and the steps are simple.

A machining process for a SiC substrate includes polishing the SiC substrate while an acidic polishing solution containing an aqueous solution of dissolved permanganate salt is applied to one side of the SiC substrate, and cleaning that side. Cleaning that side of the SiC substrate involves applying a reducing rinsing solution, capable of reducing a metal oxide and permanganate ions, to that side of the SiC substrate while the rotary table is rotated and the other side of the SiC substrate is held on the rotary table. The process then stops the application of the reducing rinsing solution and subsequently applies pure water to that side of the SiC substrate while the rotary table is rotated and the other side of the SiC substrate is held on it.

The invention discloses a chemical mechanical polishing liquid. The chemical mechanical polishing liquid comprises the following components: 1.0% to 10.0wt% of flower-shaped δ-MnO2 nanoparticles, 1.0% to 10.0wt% of abrasive particles, 0.1 to 20.0% of an oxidant, and a pH regulator in an amount such that the pH value of the chemical mechanical polishing liquid reaches 1.0 to 14.0; the flower-shaped δ-MnO2 nanoparticles are prepared by the following method: S1, using an organic compound as a reducing agent, dissolving it in deionized water to obtain a solution A; S2, dissolving permanganate in deionized water to obtain a solution B; S3, mixing solution A with solution B, reacting to obtain flower-shaped δ-MnO2 nanoparticles; in step S3, the reaction time is 0.02 to 48h, the reaction temperature is 20°C to 100°C, and the reaction pH value is 1.0 to 14.0. Compared with traditional polishing liquid, flower-shaped δ‑MnO2 nanoparticles as chemical mechanical polishing catalyst can significantly improve the polishing rate of silicon carbide, and the polished wafer has high flatness and no scratches.

The invention discloses a method for removing pollutants in sewage, and belongs to the technical field of water treatment. Comprising the following steps: adding 2, 2-dipyridyl-Fe (II) and permanganate into water containing organic pollutants, stirring to react, and removing unreacted 2, 2-dipyridyl-Fe (II) and permanganate; the addition amount of the 2, 2-dipyridyl-Fe (II) is 5 to 50 [mu] M; the adding amount of the permanganate is 50 to 300 [mu] M. According to the method, 2, 2-dipyridyl (BPY) is used for complexing Fe (II) to activate permanganate. BPY and Fe (II) can form a stable complex, so that free-state Fe (II) is provided for reaction, permanganate is activated to generate high-activity manganese species and strong-oxidizing free radicals, and pollutants are effectively degraded. Compared with single permanganate oxidation, the removal rate of pollutants is improved by 16%, and the removal rate reaches 100% within 10 min.

The invention belongs to the technical field of semiconductors, and particularly relates to a polishing composition and a preparation method and application thereof. The polishing composition comprises grinding particles, an oxidizing agent, an organic dispersing agent, an inorganic dispersing agent, a pH buffering agent, a pH adjusting agent and water. Wherein the oxidizing agent comprises permanganate, the organic dispersing agent forms an organic coating layer on the surface of the grinding particles, and the inorganic dispersing agent forms an inorganic coating layer on the surface of the organic coating layer. Through the steric hindrance of the organic dispersing agent and the static stable synergistic effect of the inorganic dispersing agent, the grinding particles obtain a good dispersing effect. Meanwhile, the outer surface of the organic coating layer is coated with the inorganic coating layer, so that oxidative damage of a strong oxidant to organic dispersant molecules of the organic coating layer can be prevented, and the dispersion stability and the polishing stability of the polishing composition are improved. Therefore, the polishing composition containing the grinding particles can continuously obtain low-defect and low-roughness surfaces when processing third-generation semiconductor materials.

The invention relates to a silicon-doped hydroxyapatite (at) MnO2 composite material and a preparation method and application thereof.The preparation method comprises the following steps that a permanganate solution is added into a silicon-doped hydroxyapatite suspension for a reaction, and the mass ratio of silicon-doped hydroxyapatite to permanganate is (5-8.75): (0.01-0.024); and after the reaction is finished, carrying out post-treatment to obtain the silicon-doped hydroxyapatite (at) MnO2 composite material. According to the preparation method, the permanganate solution is doped into the silicon-doped hydroxyapatite suspension for reaction, the permanganate solution can be decomposed and grow on the silicon-doped hydroxyapatite, a core-shell structure with the silicon-doped hydroxyapatite as a core and MnO2 as a shell is formed, and the obtained silicon-doped hydroxyapatite and MnO2 composite material is uniform in morphology, high in specific surface area and high in specific surface area. And a uniform shell layer is formed by controlling the dosage ratio of the permanganate to the silicon-doped hydroxyapatite, so that low cytotoxicity or even no cytotoxicity is ensured, and remarkable thermal response performance is achieved.

The invention discloses a preparation method and application of a modified zeolite filter material for intensively and synchronously removing dissolved manganese and ammonia nitrogen in surface water, and aims to solve the problems that two pollutants, namely manganese and ammonia nitrogen, cannot be synchronously removed by an existing manganese removal process, and the cost of natural manganese sand is relatively high. The preparation method of the modified zeolite filter material comprises the following steps: 1, sieving clinoptilolite; 2, dipping the screened clinoptilolite in a dilute nitric acid solution; 3, putting the initial zeolite into a bivalent manganese salt solution with the concentration of 0.2-0.5 mol / L, and carrying out oscillation adsorption treatment; and 4, immersing the zeolite particles adsorbed with the divalent manganese into a mixed solution of permanganate and sodium hydroxide for adsorption reaction, and washing and drying to obtain the modified zeolite filter material. The modified zeolite filter material is used as a filter material for surface water treatment, two pollutants of manganese and ammonia nitrogen can be rapidly and effectively removed, the removal rate of manganese ions in water can reach 95%, and the removal rate of ammonia nitrogen can reach 90% or above.

The invention relates to the technical field of water quality monitoring, in particular to a permanganate index detection method, device and equipment based on curve recognition and a medium, and the method comprises the following steps: acquiring a plurality of double platinum electrode signals acquired by a target instrument and obtained by adopting excessive potassium permanganate solution for back titration, a timed and quantitative equivalent titration mode is adopted in reverse titration timing; carrying out peak searching analysis according to a smooth curve obtained by carrying out smooth processing on the multiple double platinum electrode signals to obtain the existence condition of a first minimum peak and a peak position corresponding to the first minimum peak; if the first minimum peak exists and the number is 1, determining that the titration end point is the peak position corresponding to the first minimum peak; otherwise, carrying out peak searching analysis according to a differential curve obtained by carrying out differential processing on the multiple double platinum electrode signals to obtain the existence condition of a second minimum peak and the peak position corresponding to the second minimum peak; and determining a titration end point according to the information of the two minimum peaks. According to the method, the accuracy of determining the titration end point can be improved.

The invention relates to the technical field of chemical mechanical polishing solutions, in particular to a chemical mechanical polishing solution for silicon carbide and a preparation method thereof, the polishing solution comprises a catalyst, abrasive particles, a dispersing agent, an oxidizing agent, a surfactant, an acid-base regulator and deionized water; the catalyst is nano platinum particles; the abrasive particles are aluminum oxide; the dispersing agent is at least one of sodium polyacrylate, sodium hexametaphosphate, hexadecyl trimethyl ammonium bromide and the like. The oxidizing agent is at least one of permanganate, pypocholoride, dichromate and the like; the surfactant is at least one of sodium dodecyl benzene sulfonate, organic bentonite and the like; the pH regulator is at least one of phosphoric acid, nitric acid, oxalic acid and citric acid. The polishing solution can effectively improve the removal rate of silicon carbide, and meanwhile, a polished silicon carbide wafer is high in flatness and free of scratches.

Provided is a polishing composition that makes it possible to achieve a higher polishing removal rate in a composition containing a permanganate. Provided is a polishing composition containing a permanganate and a zirconium carbonate compound.

The invention relates to a method for preparing a nanofiltration membrane with high separation selectivity by utilizing proper pre-oxidation and surface secondary cross-linking of permanganate, belonging to the technical field of nanofiltration membranes. The invention aims to solve the problems that the existing polyamide nanofiltration membrane has a'permeation-selectivity 'restriction relationship, that is, the water flux and the desalination rate are difficult to synergistically improve, and the surface is easy to pollute, so that the long-term operation stability is poor. The method comprises the following steps: 1, preparing an alumina tubular ceramic membrane substrate; 2, preparation of an amination repair solution; and 3, modifying the membrane. The method is used for preparing the nanofiltration membrane with high separation selectivity by utilizing proper pre-oxidation and surface secondary cross-linking of permanganate.

A method for rapid oxidative degradation of antibiotics in water by high-frequency ultrasonic activation of permanganate / periodate comprises the following steps: injecting to-be-treated water containing trace organic pollutants into a high-frequency ultrasonic reactor, then adding potassium permanganate and periodate at the same time, and then starting ultrasonic treatment for 5-30 minutes, thereby completing the treatment of the trace organic pollutants in the water. The high-frequency ultrasonic synergistic activation permanganate / periodate provided by the invention is used for degrading trace organic pollutants in water, the permanganate and periodate serve as oxidants, and manganese oxide generated by rapid reaction of the permanganate and periodate serves as a high-frequency ultrasonic inner core, so that the ultrasonic cavitation effect is enhanced, and the removal of the pollutants is accelerated. Compared with the traditional advanced oxidation technology, the method provided by the invention has higher organic carbon removal efficiency, and the degraded product has no biotoxicity. The treatment efficiency of micropollutants in water is improved, and the method is safe and free of secondary pollution risk.

The invention provides a grinding and polishing solution for a gallium nitride wafer. The polishing solution comprises the following components in percentage by mass: 15-25% of a polishing abrasive; 3-5% of a permanganate oxidant; 5-8% of a pH regulator; 0.1-1% of a carboxylic acid complexing agent; 0.05-5% of a sulfonic acid complexing agent; 0.01%-0.5% of an amino polyacid complexing agent; 0.01-0.5% of a dispersant, and deionized water. The grinding and polishing solution provided by the invention can improve the material removal rate when the gallium nitride wafer is subjected to chemical mechanical polishing, the material removal rate is improved to 350 nm / h, a high-quality gallium nitride surface with low surface roughness and no defect is obtained, and the surface roughness Ra of the gallium nitride wafer is less than or equal to 0.15 nm.

The application discloses an alkali metal modified manganese metal oxide catalyst and a preparation method and application thereof, and the preparation method of the catalyst comprises the following steps: dissolving a manganese metal salt in ionic water to obtain a solution A; dissolving a permanganate in ionic water to obtain a solution B; adding the solution B into the solution A drop by drop, and stirring to perform a co-precipitation reaction; and collecting a precipitate obtained through the reaction, and filtering, washing and drying to obtain the alkali metal modified manganese metal oxide catalyst. The soluble manganese metal salt and the soluble permanganate are used as raw materials, water is used as a solvent, and the alkali metal ion intercalated manganese oxide catalyst is obtained through the co-precipitation reaction, and the catalyst has high catalytic efficiency and high selectivity for a reaction path of HMF oxidation into FFCA and FDCA.

The present invention discloses a ceramic membrane assembly based on a composite catalyst, a preparation method thereof, and an application thereof; the ceramic membrane assembly comprises a ceramic membrane, a composite catalyst in a ceramic membrane channel, and a water outlet block and a closure block fixed at both ends of the ceramic membrane; a water extraction hole connected to the surface of the ceramic membrane is provided at one end of the water outlet block. The composite catalyst in the ceramic membrane channel is formed by injecting a slurry into the ceramic membrane channel and then calcining it. The slurry is obtained by adding attapulgite and activated carbon to a copper nitrate solution and impregnating it. The present invention encapsulates a catalyst capable of activating persulfate into the ceramic membrane channel; the obtained ceramic membrane assembly achieves efficient removal of organic pollutants by catalytic oxidation in combination with persulfate during filtration. Compared with ozone-activated carbon technology, it can reduce the amount of activated carbon used, reduce the impact on the turbidity of the effluent, improve the removal rate of odor, permanganate index, and ammonia nitrogen, and reduce indicators such as disinfection by-products, thereby achieving deep treatment of drinking water and wastewater.

The invention discloses a method for removing antibiotics by activating permanganate through ball milling MoS2, and belongs to the field of water treatment technologies and environmental functional materials. The method comprises the following steps: co-precipitating to synthesize MgAl-layered double hydroxides, and carrying out hydrothermal compounding and ball-milling bonding to obtain the ball-milling modified composite material and the water treatment application thereof. In order to solve the technical problems that in an existing permanganate activation technology, active species in a homogeneous system are prone to inactivation, the activation efficiency of a heterogeneous system is low, and only physical contact exists between materials, so that an interface electron transfer potential barrier is high, sodium thiosulfate is adopted for assisting ball milling to induce chemical bonding, a continuous electron transfer network is constructed, an electron-rich state is formed on the surface of MoS2, and the MoS2 is prepared. Antibiotics are synergistically oxidized through a high-valence manganese intermediate and a free radical double path, and meanwhile heavy metal is adsorbed through multiple mechanisms of sulfur coordination, sulfur vacancy anchoring and hydroxyl complexing. Under the optimal condition, the method realizes that the SMX removal rate reaches 96.8% and the lead ion removal rate reaches 99.2%.

The invention relates to the field of pharmaceutical chemicals, and particularly discloses a synthesis method of 3-tertiary butyl dimethyl siloxy-3-(furan-2-yl)-propionaldehyde. The preparation method comprises the following steps: reacting 1-tert-butyldimethylsiloxy-1-(furan-2-yl)-butyl-3-ene with an aqueous solution of permanganate in the presence of ethylene glycol to generate an o-dihydroxyl intermediate, and then reacting the o-dihydroxyl intermediate with sodium periodate to prepare the 3-tert-butyldimethylsiloxy-3-(furan-2-yl)-propionaldehyde. The 3-tert-butyldimethylsilyloxy-3-(furan-2-yl)-propionaldehyde is synthesized by adopting the method disclosed by the invention, so that the defects that the cost is too high, the environmental protection property is poor and large-scale industrial production cannot be realized in the traditional production process are overcome.

A filter medium is provided with a layer (A) provided with non-impregnated active carbon, a layer (B) with a solid carrier material that is impregnated with a permanganate salt, and a layer (C) with alkaline impregnated active carbon. The layer (B) and the layer (C) are arranged such that a gas flowing through the filter medium flows through the layer (B) before flowing through the layer (C). The layer (A) is arranged such that the gas flowing through the filter medium flows through the layer (A) before flowing through the layer (B) or the gas flowing through the filter medium flows through the layer (A) after flowing through the layer (C).

The invention relates to the technical field of water treatment, in particular to a catalytic ceramic membrane and a preparation method thereof.The preparation method comprises the steps that a tubular ceramic membrane serves as a matrix, deposition of a catalyst on the surface and in pores of the membrane is achieved through the negative pressure suction effect of a constant-current peristaltic pump, then dopamine is induced to be subjected to auto-polymerization under the condition that the pH is 8.5, and a polydopamine coating layer with the thickness being 50-200 nm is formed; the catalyst loading is realized. According to the structure, a complete assembly is formed through connection of a water inlet end quick-insertion type pipeline and sealing packaging of a water outlet end epoxy resin, pollutant oxidative degradation is synchronously achieved in the persulfate activation process, meanwhile, the effluent turbidity is reduced, the permanganate index removal rate and the ammonia nitrogen removal rate are effectively increased, and the environmental pollution is reduced. Meanwhile, generation of trihalomethane disinfection by-products can be effectively inhibited, and the method is suitable for treating polluted water bodies containing refractory organic matters, odor substances and disinfection by-product precursors and can be applied to the fields of deep purification of surface water and reuse of reclaimed water.

The invention discloses a method for preparing nano manganese dioxide based on amino acid regulation and application. The method comprises the following steps: providing a mixed reaction system containing a manganese source precursor, a morphology regulating agent and water; the morphology regulating agent comprises amino acid; the manganese source precursor comprises a combination of permanganate and divalent manganese salt; and carrying out hydrothermal reaction on the mixed reaction system to prepare the nano manganese dioxide. The method provided by the invention shows unique advantages in the aspect of controlling the morphology and the structure of the material, the nano-scale manganese dioxide can be efficiently obtained, and the prepared nano-manganese dioxide has a relatively high specific surface area and a large number of active sites. Under the combined action of the structural characteristics, when the material is applied to a battery system, the electrochemical performance of the material can be effectively improved, and a new thought is provided for design and development of a high-performance battery material.

Sealant compositions for conferring unpainted corrosion resistance to a metal surface, such as an aluminum alloy, methods for conferring corrosion resistance by applying the sealant compositions, and metal surfaces, components, and articles that have been thereby rendered corrosion resistant, wherein the sealant compositions may be substantially free of chromium (VI), permanganate, heavy metals, or lanthanide rare-earth metals, and can provide performance similar to the military Class 1A specification by conferring protection against corrosion, whether painted or unpainted.

Provided herein are sealant compositions for imparting unpainted corrosion resistance to metal surfaces, such as aluminum alloys, wherein the sealant compositions may be substantially free of chromium (VI), permanganate, heavy metals, or lanthanide rare earth metals. Advantageously, the sealant composition can provide performance similar to military Class 1A specifications by imparting unexpected corrosion protection, whether painted or unpainted. Also provided herein are methods of imparting corrosion resistance by applying the sealant compositions, as well as metal surfaces, parts, and articles that have been corrosion resistant using the sealant compositions of the invention.

The utility model relates to the technical field of permanganate detection, in particular to a high-accuracy water quality ORP (Oxidation Reduction Potential) permanganate index detection electrode method measuring chamber which comprises a detection module for measuring and outputting a numerical simulation signal, and a digestion container for accommodating sample liquid and a reagent for reaction, the heating module is used for heating the digestion container to generate steam, the condensation reflux device is used for digesting the heated steam to form liquid drops to fall back, and the stirring mechanism is used for fully stirring sample liquid and reagents. The device is simple in structure and reasonable in design, can realize a series of work such as automatic input reaction of sample liquid and reagents, heating of the sample liquid, digestion of steam, automatic stirring of the sample liquid and the reagents, automatic detection of permanganate indexes and the like, and is high in automation degree, high in detection efficiency, good in detection effect, high in integration and low in cost. Meanwhile, bottom liquid feeding is adopted, so that accumulation of water sample bubbles can be effectively avoided, dead volume can be reduced, and detection precision can be further improved.

The invention provides a method for monitoring the permanganate index of water quality on line. The method comprises the following steps: detecting the permanganate index of a water sample by adopting a titration method, and collecting the titration drop number and the absorbance of the water sample in the titration process; drawing a titration curve based on the titration drop number and the absorbance of the water sample; determining a titration end point based on the titration curve, and thus obtaining the titration drop number; and substituting the titration drop number into a standard function to obtain the permanganate index of the water sample. The method provided by the invention not only realizes on-line monitoring of the permanganate index of the water sample, but also is simple and convenient to operate, does not need frequent maintenance, can effectively reduce the use cost, improves the detection precision of the permanganate index of the water sample, and is beneficial to application and popularization.

1. The name of the design product: full-automatic permanganate index analyzer. 2. The use of the design product: for monitoring permanganate index in various water quality. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.

This invention discloses a method for determining the permanganate index based on modified biochar adsorbents, comprising the following steps: Step 1, modifying the biochar with a modifying solution. When the concentration of the modifying solution is 0.1 mol / L, an acidic modifier is used to modify the biochar adsorbent; when the concentration of the modifier solution is 0.2~0.4 mol / L, a salt modifier is used. Step 2, thoroughly shaking and mixing the modified biochar adsorbent with a water sample, adding sulfuric acid solution to acidify the water sample, adding potassium permanganate solution to the acidified water sample and heating the reaction, adding sodium oxalate solution after heating, shaking until the solution becomes colorless and without precipitate, titrating with potassium permanganate solution while hot until a light pink color appears and does not fade within a fixed time, recording the volume of potassium permanganate solution consumed, and calculating the potassium permanganate index. The type and concentration of the modifier used in this invention have a significant impact on the adsorption performance of biochar.

The present application belongs to the technical field of water treatment, and provides a method for removing organic pollutants by using metal ions to strengthen permanganate oxidation and coagulation, which comprises the following steps: (1) adding metal salt capable of releasing metal ions in wastewater to wastewater containing organic pollutants, and then adding permanganate for wastewater treatment; in the wastewater treatment process, the metal ions released by the metal salt in the wastewater will complex with the permanganate, enhance the electrophilic reactivity of the permanganate, and then strengthen the permanganate oxidation to degrade the organic pollutants in the wastewater; the permanganate is finally reduced and converted into colloidal MnO2; (2) adjusting the pH value of the wastewater to 8.0-11.0, adding a flocculant to the wastewater, uniformly mixing, and then fully flocculating and settling to complete the wastewater treatment. The present application can remove the organic pollutants by strengthening the permanganate oxidation, and simultaneously remove the exogenous metal ions, so as to reduce the environmental risk of the exogenous activator.

The present application belongs to the technical field of water quality permanganate index detection, and particularly relates to a detection system for online monitoring of permanganate index. The present application provides a detection system for online monitoring of permanganate index, aiming at solving the problem of low detection precision of permanganate index in the prior art. The present method adopts a spectrophotometric colorimetric method, eliminates the reducing agent in the traditional online analysis method, reduces the reagent use cost, and also avoids the instability of sodium oxalate in a high-temperature and acidic environment, thereby generating systematic errors. The present method eliminates the use of reducing agent, and compared with the laboratory and the traditional online analysis process, the analysis process of the present method is reduced, the single test cycle is about 25 minutes, which is about 56-63% of the traditional online time length, and is far less than the analysis time length of the laboratory.

The application discloses a permanganate index online monitoring method and system, and the method comprises the following steps: S1, setting a minimum threshold value A; S2, taking a quantitative sample to be measured, then sequentially adding potassium permanganate solution and acid solution, and bubbling and mixing; S3, heating to 100 DEG C, and the duration is not more than 10 min, and then cooling to 40 DEG C; S4, adding an alkaline solution to the sample to be measured, bubbling and mixing; S5, adding 1 mL of pure water, bubbling and mixing, reacting for 5 min, and reading a received light intensity signal X; S6, comparing X with A; S8, calculating the absorbance of the sample to be measured, and S9, calculating the permanganate index of the water sample; the system comprises a four-channel valve, a heating pipe, a peristaltic pump, a twelve-channel valve and a metering pipe, the digestion is completed at 100 DEG C for 10 min, colorimetric test can be carried out, the reaction system only generates about 5 mL of reaction waste liquid at a time, the system has a self-cleaning function, the detection device does not need to be maintained in a life cycle, and the design achieves the purposes of short test time and low cost.

A non-thermal method for regenerating an alkali metal permanganate impregnated molecular filter comprising: washing a spent molecular filter comprising oxidized products selected from manganate (MnO₄²⁻), manganese dioxide (MnO₂), and sulfate and nitrate salts using distilled water; contacting said washed and wet molecular filter with a solution comprising: (i) an alkali metal hydroxide, and (ii) an alkali metal persulfate, to promote in-situ oxidation of Mn(IV) or Mn(VI) species to Mn(VII), thereby obtaining a treated molecular filter; and drying the treated molecular filter to yield a regenerated molecular filter characterized by the reformation of permanganate ions.