71 results about "Permanganate salt" patented technology

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.

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 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.

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 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.

The invention provides a permanganate index on-line automatic determination method and system, and the method comprises the steps: synchronously obtaining an oxidation-reduction potential signal, an absorbance signal and a temperature signal of a to-be-detected solution at the same measurement point, and carrying out the temperature drift compensation of the oxidation-reduction potential to extract the potential change characteristics, thereby determining a predicted titration volume interval. If the potential change characteristic meets a first end point judgment condition and the absorbance signal reaches a verification threshold value, determining the corresponding volume as a first end point; if the potential change characteristic does not meet the condition or the absorbance signal does not reach the verification threshold value, the absorbance change characteristic is extracted based on the absorbance signal, and a second end point is determined when a second end point judgment condition is met. And judging a final titration end point according to the obtained number of end points and a difference value between the two end points, and calculating a permanganate index. Through potential and absorbance dual-signal collaborative decision making, the terminal point identification accuracy and the anti-interference capability are improved, and the method is suitable for online automatic monitoring of complex water bodies.

The application discloses a method for removing pollutants in water by using permanganate and carbon quantum dots, and aims at solving the problems of slow reaction and low removal rate of difficult-to-degrade organic matters such as phenol in water bodies. The method for removing pollutants in water comprises the following steps: firstly, adjusting the pH of water to be treated containing phenol to 6-9; secondly, adding carbon quantum dots into the adjusted water to be treated to obtain water to be treated containing carbon quantum dots; and thirdly, adding permanganate into the water to be treated containing carbon quantum dots to react for 30-60 min, so as to remove the pollutants in water. The permanganate and the carbon quantum dots generate intermediate products such as manganese dioxide in situ, the intermediate products oxidize phenol into oxidation products, meanwhile, the carbon quantum dots have more micropore structures after reacting with the permanganate, so that active sites are provided for adsorbing the oxidation products, the adsorption capacity of the carbon quantum dots is enhanced, the removal rate of phenol is improved, and the removal rate of phenol can reach more than 95% after reacting for 30 min.

The invention discloses a method for determining an organic additive in an ammonia chloride method electrolytic zinc solution, and relates to the technical field of ammonia chloride method electrolytic zinc solution determination, and the method comprises the following steps: preparing an organic additive standard solution A with a concentration of a; the method comprises the following steps: diluting a to-be-detected sample of an ammonia chloride process electrolytic zinc solution with water to n times of volume to obtain a diluted sample; respectively measuring the permanganate indexes of the standard solution A and the diluted sample by adopting a potassium permanganate oxidation-sodium oxalate reduction titration method; calculating a conversion coefficient; and calculating the concentration of the organic additive in the to-be-detected sample according to a formula. According to the method, the unknown additive can be measured, and the measurement precision and reliability are improved, so that accurate data support is provided for the production process.

The application discloses a method for repairing chlorobenzene contaminated groundwater in-situ by using soluble Mn(III), and belongs to the technical field of environmental pollution repair, and comprises the following steps: construction of an in-situ injection system, preparation of a repair reagent, rapid removal of chlorobenzene, and continuous mineralization of degradation products. The soluble Mn(III) generated by a permanganate / bisulfite (PM / BS) process is selected as the repair reagent, the chlorobenzene pollutants are rapidly and efficiently degraded through an electrophilic substitution mechanism, the PM process is coupled, the continuous mineralization of intermediate products is realized, and the complete elimination of the chlorobenzene pollutants in the groundwater is achieved. The technical method is simple and practical, the process is green, the treatment effect is complete and not prone to rebound, the cost is relatively low, the method is beneficial to large-scale promotion, and the method has remarkable economic, environmental and social effects.

The invention relates to the technical field of gas purification, in particular to a composite adsorbent and a preparation method and application thereof.Pseudo-boehmite is loaded in pores and / or on the surface of porous activated carbon, and rich hydroxyl groups on the surface of the pseudo-boehmite are combined with oxygen-containing functional groups on the surface of the activated carbon through hydrogen-bond interaction; by using the composite carrier as a substrate, permanganate on the surface of the composite carrier interacts with hydroxyl on the surface of the pseudo-boehmite to realize high dispersion and strong anchoring, so that the composite adsorbent shows excellent stability, and the adsorption capacity of the adsorbent is improved. The adsorption efficiency and the saturated adsorption capacity are remarkably improved by controlling the relational expression of the pore volume of each stage and the loading capacity of the porous activated carbon.

A grinding composition is provided, comprising abrasive grains, permanganate, aluminum salt, and water. In the above grinding composition, the concentrations of the abrasive grains (W1 [wt%]), the permanganate (C1 [mM]), and the aluminum salt (C2 [mM]) satisfy at least one of the following conditions: [A], [B], [C]. [A] Satisfies both 500 ≤ (C1 / W1) and 0.04 ≤ (C2 / C1). [B] Satisfies both 200 ≤ (C1 / √(W1)) and 8 ≤ C2. [C] Satisfies both 500 ≤ (C1 / W1) and 8 ≤ C2.

The present application belongs to the field of gas treatment, and particularly relates to a neodymium-doped delta-MnO2 aldehyde removal material, a preparation method, application and aldehyde removal product thereof, wherein the preparation method of the neodymium-doped delta-MnO2 aldehyde removal material is as follows: a solution A containing a divalent manganese source and a neodymium source is obtained, a solution B containing permanganate is obtained, the solution A and the solution B are synchronously added into a bottom liquid to perform a nucleation reaction, and then a crystallization treatment is performed to obtain the neodymium-doped delta-MnO2 aldehyde removal material; wherein the molar ratio of the divalent manganese source and the neodymium source in the solution A is 1:0.01-0.3; the molar ratio of the divalent manganese source in the solution A and the permanganate source in the solution B is 1:0.6-1; the temperature of the nucleation reaction is 15-45 DEG C; and the temperature of the crystallization treatment is above 70 DEG C. Through in-depth research, the present application innovatively uses neodymium to participate in the synthesis process of manganese dioxide, cooperates with the dosage of Nd, and jointly controls the nucleation temperature and the crystallization temperature, so that the formation of a delta phase can be unexpectedly induced, and in addition, the formation of a flower-like morphology conducive to the removal of formaldehyde can also be induced.

Disclosed herein is a method of extracting metal from a metal sulfide containing material comprising the steps of: a) providing an aqueous acidic oxidant mixture comprising water, an acid, an oxidising means, and a halide ion source, wherein the aqueous acidic oxidant mixture has a pH of less than 7; wherein the oxidising means comprises hydrogen peroxide, ozone, oxygen, chlorine, bromine, iodine, hypochlorous acid, hypobromous acid, hypoiodous acid, a hypochlorite salt, a hypobromite salt, a hypoiodite salt, a percarbonate salt, a persulfate salt, a permanganate salt, an anode connected to a power source, or combinations thereof; b) contacting the aqueous acidic oxidant mixture with the metal sulfide containing material to extract the metal from the metal sulfide containing material and form a metal halide solution; wherein the metal comprises copper, nickel, lead, zinc, or combinations thereof.

This invention provides a method for manufacturing silicon carbide substrates with high cleanliness. [Solution] A method for manufacturing a silicon carbide substrate, comprising the steps of: chemically mechanically polishing a silicon carbide substrate using a polishing solution containing permanganate; sequentially washing the chemically mechanically polished silicon carbide substrate with sulfuric acid peroxide, ammonia peroxide, hydrochloric acid peroxide, and hydrofluoric acid; and drying the washed silicon carbide substrate using a spin dryer, wherein in the step of washing the chemically mechanically polished silicon carbide substrate with sulfuric acid peroxide, the silicon carbide substrate is washed while ultrasonic waves are irradiated onto the sulfuric acid peroxide; and in the step of drying using a spin dryer, with the lid of the spin dryer open, air is passed from the opening of the spin dryer toward the exhaust port, and then the silicon carbide substrate is placed inside the spin dryer to dry the silicon carbide substrate.

This invention discloses a method for cleaning irreversible membrane fouling. After rinsing the fouled membrane with deionized water to remove deposited contaminants, the membrane is cleaned using a mixed solution of permanganate and persulfate as the cleaning system, followed by cleaning with a reducing agent. This completes the membrane cleaning process. Throughout the cleaning process, permanganate and persulfate react with each other under the influence of electron-rich contaminants, decomposing to produce active manganese (Mn(V)). aq Mn(VI) aq ), reactive oxygen species ( · OH, SO4 ·‑ O2 ·‑ , 1 O2 and MnO2, along with ROS and RMnS, oxidize contaminants on the membrane, causing them to detach. A reducing agent is then used to reduce the MnO2 produced during decomposition back to Mn. 2+ During this process, the formed manganese-impurity complex flows out of the membrane pores along with the reducing agent, achieving a cleaning effect. Compared with existing cleaning methods, this invention has better cleaning ability, shorter cleaning time, less energy consumption, good stability, simple operation, wide applicability, and good application prospects.

A chemical polishing bath for polishing a part made of aluminum or of aluminum alloy, or a portion of such a part, which bath includes an oxidizing agent capable of attacking the aluminum, chosen from nitric acid, hydrogen peroxide, permanganate, or a mixture thereof, at a concentration between 1.2 and 3.0 mol / L. The polishing bath also includes a fluoride complexing agent capable of forming a complex with the oxidized aluminum, at a concentration between 0.3 and 1.6 mol / L; a catalyst (Cu); and phosphoric acid at a concentration between 10.10 and 14.30 mol / L and also sulfuric acid at a concentration between 1.50 and 3.60 mol / L. The bath is particularly suitable for polishing parts resulting from additive manufacturing (3D printing).

The present invention belongs to the field of anode materials, and specifically discloses a preparation method of a bamboo-based hard carbon material. The bamboo stems of 3-5-year-old bamboos are screened, cut into sections and peeled to obtain peeled bamboo tubes; the peeled bamboo tubes are placed in a modification solution for liquid-phase modification treatment, and then calcined in an oxygen-containing atmosphere for gas-solid modification treatment to obtain modified bamboo tubes; the modification solution is an aqueous solution containing at least one solute of permanganate, hypochlorite, hydrogen peroxide, hypochlorous acid, manganate, dichromate, etc.; the calcination temperature is 150-300 °C; the modified bamboo tubes are pre-carbonized, crushed and classified to obtain a precursor, and then carbonized to obtain the bamboo-based hard carbon material. The present invention also includes the material prepared by the above preparation method and its application. The material of the present invention can exhibit excellent electrochemical performance and uniformity.

A flat-surface polishing method of performing a polishing operation for polishing a flat surface of a semiconductor substrate by using a polishing pad with circulation and supply of a polishing fluid including permanganate and water. The flat-surface polishing method includes: (a) during a predetermined time from start of the polishing operation, performing the polishing operation, while maintaining pH of the polishing fluid in a strong acid range by dropping a pH adjuster into the polishing fluid; and (b) after the predetermined time has elapsed and until the polishing operation is completed, performing the polishing operation, while making the pH of the polishing fluid higher than the strong acid range by stopping dropping the pH adjuster into the polishing fluid. Also disclosed is a flat-surface polishing apparatus used for carrying out the flat-surface polishing method.