53 results about "Potassium oxalate" patented technology

The invention belongs to the technical field of pharmaceutical chemical processes, and particularly relates to a preparation method of a penem antibiotic intermediate 4-BMA, which comprises the following steps: adding Zn powder, chlorosilane, aliphatic tertiary amine, zinc salt and 4-AA in a formula (I) into THF (tetrahydrofuran), uniformly stirring, dropwise adding a THF solution of alpha-haloamide with an induction group in a formula (II) for reaction, filtering the reaction solution, removing the zinc powder, and drying to obtain the penem antibiotic intermediate 4-BMA. Extracting the filtrate to obtain a THF phase, washing with an aqueous solution of potassium oxalate, and recovering THF to obtain a formula (III); and carrying out oxidative hydrolysis, sulfur dioxide quenching, sulfur dioxide acid regulation crystallization and recrystallization on the formula (III) to obtain the intermediate 4-BMA. According to the preparation method disclosed by the invention, a zinc salt is used as a catalyst during preparation of the formula (III), potassium oxalate is used for removing residual Zn (II) in a THF phase, SO2 is used for quenching hydrogen peroxide and acid regulation and crystallization of 4-BMA, the oxygenolysis problem of 4-BMA is solved, and the preparation method has the characteristics of greenness, safety and high efficiency, is strong in product competitive advantage and is suitable for industrial production.

The invention discloses biomass porous carbon material loaded iodine as well as a preparation method and application thereof. The preparation method comprises the following steps: pretreating a biomass material: firstly pickling and then washing to be neutral; the method comprises the following steps: uniformly mixing a biomass material, a pore forming agent, a nitrogen source and water, and pre-carbonizing in a nitrogen or inert gas atmosphere to obtain yellow powder, with the pore forming agent being potassium oxalate and the nitrogen source being melamine; carbonizing the yellow powder at 600-900 DEG C in a nitrogen or inert gas atmosphere, cooling to room temperature to obtain black powder, washing and drying to obtain a biomass porous carbon material; the method comprises the following steps: mixing the biomass porous carbon material and iodine elementary substance, heating in a closed environment to sublimate the iodine elementary substance and absorb iodine by the biomass porous carbon material, cooling to room temperature, preserving heat at 50-65 DEG C in an open environment for at least 12 hours, and cooling to room temperature to obtain the biomass porous carbon material loaded iodine. The battery obtained by loading iodine on the biomass porous carbon material still has good cycle life and relatively high capacity retention rate under high rate.

The present application relates to a sodium-ion battery precursor, a positive electrode material, a preparation method, and a use. A complexing agent solution used for preparing the sodium-ion battery precursor comprises a first complexing agent and a second complexing agent, wherein the first complexing agent comprises any one of or a combination of at least two of oxalic acid, sodium oxalate, or potassium oxalate, and the second complexing agent comprises any one of or a combination of at least two of citric acid, sodium citrate, or potassium citrate. In the present application, by providing the specific complexing agents, the prepared sodium-ion battery precursor has a relatively high specific surface area, thereby facilitating the intercalation of sodium ions when sintering and preparing a positive electrode material, so that the electrochemical performance of the sodium-ion battery positive electrode material can be significantly improved.

The invention discloses a method for preparing a pore-adjustable carbon molecular sieve through binary activation of heavy oil and application, and belongs to the technical field of biomass resource utilization and water treatment. The method comprises the following steps: (1) mixing heavy oil and a binary activator, and standing to form a carbon-containing precursor mixture; wherein the binary activating agent is calcium citrate and potassium oxalate; (2) performing pyrolysis activation on the carbon-containing precursor mixture in an inert atmosphere, and cooling after the pyrolysis is completed to obtain biological activated carbon; and (3) washing and drying the biological activated carbon to obtain the carbon molecular sieve. The method has the advantages of greenness, environmental protection, convenient process and efficient production. The prepared carbon molecular sieve is developed in pore structure, concentrated in pore size distribution and good in adsorption characteristic, has a wide application prospect in water treatment, and realizes comprehensive treatment of resource utilization of two pollutants, namely waste heavy oil and dye wastewater.

The invention discloses a fabric dyeing and printing method based on plant heat transfer printing, and belongs to the field of natural material fabric printing and dyeing. Comprising the following steps: cleaning a printing and dyeing target fabric and a cotton blanket; soaking the cleaned printing and dyeing target fabric in a titanium potassium oxalate mordant for mordanting, and wringing after mordanting is completed; the cleaned cotton blanket is soaked in an aluminum potassium sulfate dodecahydrate mordant for mordanting, and the cotton blanket is wrung out after mordanting is completed; flattening the mordant-dyed target fabric, placing plants, covering the mordant-dyed cotton blanket on the plant-placed target fabric, and pressing and flattening the mordant-dyed target fabric; the plastic barrier is laid on the cotton blanket, and the plastic barrier, the cotton blanket, the plants and the printing and dyeing target fabric are tightly wound and bound together from bottom to top through a roller body; the bound printing and dyeing target fabric is cooked in a waterproof mode, and transfer printing is completed; and cooling, taking out and opening the transferred printing and dyeing target fabric, separating the plastic barrier, the printing and dyeing target fabric, the plant and the cotton blanket, cleaning the printing and dyeing target fabric, ironing and drying.

The invention discloses a zinc / cobalt-based spinel oxide composite material catalyst as well as a preparation method and application thereof. The zinc / cobalt-based spinel oxide compound catalyst is prepared by taking zinc sulfate, cobalt nitrate and potassium oxalate as metal nodes and ligands through hydrothermal treatment and calcination. The ZnCo2O4 disclosed by the invention is applied to reduction of p-nitrophenol as a high-efficiency catalyst, and under the condition of room temperature, sodium borohydride is used as a reducing agent, and the efficiency of converting p-nitrophenol into p-aminophenol within 4 minutes can reach 100%. The zinc / cobalt-based spinel oxide composite material catalyst is synthesized by adopting a simple and environment-friendly method, the sodium p-borohydride has extremely high catalytic activity in reduction of p-nitrophenol, p-nitrophenol with relatively high toxicity can be reduced into p-aminophenol with relatively low toxicity, and the zinc / cobalt-based spinel oxide composite material catalyst has a potential application prospect in the fields of sewage treatment and the like.

The invention discloses an intelligent environment-friendly lime dosage on-site rapid detection device and a use method thereof, and relates to the technical field of lime detection. Comprising a comprehensive control system and an operation treatment system, a liquid crystal screen and a main power switch are installed on the top face above the comprehensive control system, a calculator is installed in the comprehensive control system, and a potassium oxalate volumetric flask, an ammonium chloride volumetric flask and a tail gas treatment device are installed in the operation treatment system. The potassium oxalate volumetric flask, the ammonium chloride volumetric flask and the tail gas treatment device are sequentially arranged from left to right, a reaction container and an electronic scale are mounted outside the operation treatment system and are sequentially arranged from left to right, a stirrer is mounted at the midpoint position of the bottom surface of the reaction container, and four electrodes are spirally and rotatably mounted on the reaction container from bottom to top; and an ultrasonic generator and a thermostat are arranged below the reaction container. The device disclosed by the invention can realize an integrated function of self-stirring, self-titration, self-measurement and self-cleaning, can quickly detect the lime dosage on site, and improves the detection rate and precision.

The invention relates to the technical field of bioengineering, in particular to a preparation method and application of an antibacterial peptide, and the amino acid sequence of the antibacterial peptide is shown as SEQ ID No: 1 and is named as L8. The preparation method of the antibacterial peptide L8 comprises the following steps: S1, obtaining an L8 target gene segment; connecting an L8 target gene segment with a pLC vector to obtain a connection product; transforming the connection product into an escherichia coli DH5-alpha competent cell, and screening positive clones to obtain a pLC-L8 recombinant plasmid; s2, taking the pLC-L8 recombinant plasmid as a substrate, and carrying out cell-free protein synthesis reaction to obtain the antibacterial peptide L8, the cell-free protein synthesis system comprises 175 mM of potassium glutamate, 10 mM of ammonium glutamate, 2.7 mM of potassium oxalate, 33 mM of PEP, 38 mM of compound amino acid, 10 mM of magnesium glutamate, 2% (w / v) PEG-8000, 5 nM of pLC-L8 recombinant plasmid, 11.25 mM of lactose, 33.33% (v / v) of crude extract, 100 mg / mL of escherichia coli tRNA and 2.5 nM of T7 RNA polymerase. The antibacterial peptide L8 is obtained by optimizing the antibacterial peptide LRGG, and compared with the LRGG, the antibacterial peptide L8 subjected to cell-free protein synthesis reaction expression has better antibacterial activity and biological safety.

The preparation method comprises the following steps: dissolving titanium potassium oxalate in water, sequentially adding ammonium sulfate and sodium chlorite, uniformly stirring to obtain a homogeneous mixed solution, and dropwise adding concentrated sulfuric acid to obtain a precursor solution; and carrying out hydrothermal reaction on the precursor solution, alternately washing the obtained precipitate with water and ethanol, and drying to obtain the efficient titanium dioxide photocatalyst. By accurately regulating and controlling the use amount of sodium chlorite, accurate regulation and control on the crystal phase composition of the product are successfully realized, and the prepared powder is in a blocky particle shape and has excellent monodispersity. According to the preparation process, subsequent high-temperature calcination or complex modification steps are not needed, energy consumption is reduced, doped element loss is avoided, the preparation process is simple and economical, and meanwhile the photocatalytic performance of titanium dioxide is remarkably improved. Compared with a commercial P25 photocatalyst, the double-phase titanium dioxide photocatalyst prepared by the invention has efficient degradation performance.

The invention discloses a preparation method of a super-hydrophobic aluminum profile and application of the super-hydrophobic aluminum profile in a marine environment, and belongs to the technical field of aluminum alloy materials. Firstly, alloy elements are optimized, secondly, in the key process step-anodic oxidation, composition of an anolyte is optimized, and a basic electrolyte and a modified additive are arranged. A polyethylene glycol-titanium potassium oxalate-citric acid ternary composite additive is adopted, a double-voltage gradient oxidation process is combined, a multi-stage composite structure is constructed in an oxidation film, and meanwhile construction of the aluminum alloy profile with high hardness (larger than or equal to 500 HV) and stable super-hydrophobicity (the contact angle is larger than or equal to 160 degrees) is achieved. The super-hydrophobic aluminum profile prepared through the method is high in corrosion resistance and still keeps excellent performance in the extreme environment, the service life of equipment is remarkably prolonged, and the safety and stability of offshore facilities are improved.

The invention provides a preparation method of a biomass platform molecule angelica lactone isomerization catalyst. The catalyst comprises one of the following solid metal oxides and one of potassium assistants: eight metal oxides (m-zirconium oxide, t-zirconium oxide, c-zirconium oxide, aluminum oxide, magnesium oxide, barium oxide, lanthanum oxide and neodymium oxide) and seven potassium sources (potassium nitrate, potassium carbonate, potassium acetate, potassium hydroxide, potassium chloride, potassium oxalate and potassium oxide). By designing the preparation method of the metal oxide, the high-specific-surface-area pure-crystalline-phase metal oxide is obtained; by introducing the potassium aid, the surface alkalinity of the catalyst is effectively regulated and controlled, so that the alpha-angelica lactone is simply and efficiently isomerized into the beta-angelica lactone. The catalyst provided by the invention has the characteristics of high activity, high selectivity, high stability and easy recovery, and provides a feasible technical approach for biomass platform molecule angelica lactone isomerization.

The invention relates to a preparation method of nitrogen self-doped magnetic porous biochar, which comprises the following steps: by taking pepper branches as a raw material, carrying out pretreatment treatment, and then carrying out step-by-step high-temperature carbonization treatment by taking ferric potassium permanganate and ferric potassium oxalate as a composite activating agent, namely mixing pepper branch powder, cellulase and water, and carrying out constant-temperature reaction at 50-60 DEG C for 12-16 hours, so as to obtain the nitrogen self-doped magnetic porous biochar. After the reaction is finished, filtering to obtain a solid sample, washing the solid sample to be neutral, and then drying to obtain pretreated raw material powder; the biochar prepared through cellulase pretreatment and K2FeO4 and K3 [Fe (C2O4) 3 composite activation treatment has an excellent specific surface area and a specific void structure, has excellent adsorption performance on organic dyes such as methylene blue, lemon yellow and carmine, effectively improves the negative magnetic performance of the biochar, and is high in recovery rate and recovery rate. And the subsequent biochar keeps excellent adsorption stability in the repeated use process.

The application discloses a mild rust removal method for a rusted iron product surface, and comprises the following steps: submerging the rusted iron product into a rust removal liquid at T DEG C until rust on the surface of the rusted iron product is completely removed, wherein T DEG C is 20-60 DEG C, the rust removal liquid comprises potassium oxalate, oxalic acid and water, the mass of potassium oxalate in the rust removal liquid is at least 3.12 times the mass of rust in the rusted iron product, and the molar ratio of potassium oxalate to oxalic acid is 1:1. When the temperature of the rust removal liquid is in the range of 20-60 DEG C, the rust removal liquid selectively reacts with rust on the surface of the rusted iron product and base iron, i.e. only reacts with rust, and the base iron is not damaged. The surface of the treated iron product presents a soft metallic luster, and the rust removal is complete, the operation is simple, and the cost is low.

Desensitizing oral care composition useful for treating dentinal hypersensitivity, comprising potassium oxalate and methods of use thereof. Delivery systems including a strip of material and such oral care compositions for the treatment of dentinal hypersensitivity and methods of use thereof.

The present invention relates to the technical field of zeolite molecular sieve synthesis, and specifically relates to a template-free hierarchical pore ETS-10 zeolite molecular sieve, its preparation method and application. The steps are as follows: Add an aqueous solution of sodium oxalate to water glass, stir evenly, then add potassium titanyl oxalate, adjust the pH to 11-12, stir evenly, and carry out hydrothermal reaction at 220-240 °C for at least 24 h. After filtering out the product, wash and dry it, and calcine it at 450 °C to obtain the product; Calculate the dosages of water glass, sodium oxalate, and potassium titanyl oxalate according to the molar ratio SiO2:TiO2:K2O:Na2O:H2O = (5.0-6.8):1.0:1.0:(4.1-6.3):(180-245); The ETS-10 zeolite molecular sieve synthesized by the present invention has a hierarchical pore structure and high crystallinity. When it is loaded with transition metals to form a catalyst and applied to the reaction of CO2 hydrogenation to methane, it has high catalytic activity and thermal stability.

Disclosed in the present invention are the preparation and use of a supported photo-Fenton catalyst. The preparation method comprises: I, formulating a sodium tungstate solution and a potassium oxalate solution, adjusting the pH until acidic, and performing a hydrothermal reaction and calcination to obtain a tungsten trioxide composite material; II, formulating a sodium tungstate solution and an ammonium ferrous sulfate solution; III, ultrasonically dispersing the tungsten trioxide composite material in the ammonium ferrous sulfate solution to obtain a suspension; and IV, under continuous stirring, adding the sodium tungstate solution into the suspension in a dropwise manner, stirring same, performing a hydrothermal reaction, and washing and drying same to obtain a tungsten trioxide / iron tungstate nano material. In the present invention, an FeWO4 / WO3 heterojunction is formed by using a hydrothermal synthesis method, which improves the separation efficiency of carriers and the photo-Fenton catalyst activity of the tungsten trioxide / iron tungstate nano material, thereby increasing the catalytic efficiency thereof. The catalyst is suitable for the degradation treatment of photocatalyst wastewater or dye methylene blue and methyl violet, and the preparation process is simple and easy to implement, and has low pollution.

The invention discloses boron-doped silicon dioxide, a preparation method thereof and low-melting-point borosilicate glass, and belongs to the technical field of silica sol. The preparation method of the boron-doped silicon dioxide comprises the following steps: uniformly mixing a boric acid solution, an aluminum sol, a potassium oxalate solution, a sodium carbonate solution and a silica sol, carrying out a hydrothermal reaction in a pressurized state, cooling to obtain homogeneous boron-doped silicon dioxide gel, and finally drying to obtain homogeneous boron-doped silicon dioxide particles. Boron is doped under a high-temperature and high-pressure hydrothermal condition to form a hydrothermal stable boron-doped silicon dioxide skeleton, so that the stability and the thermal expansion coefficient of the material are enhanced.

The application belongs to the technical field of noble metal separation, and relates to a temperature control type hydrophobic extractant for separating gold (III) in a homogeneous phase and a preparation and extraction method thereof. The extractant is a piperidine ethyl acetate type ionic liquid. The ionic liquid has excellent high selectivity, only has high extraction efficiency on gold (III) in a multi-metal mixed solution, and the extraction efficiency can be as high as 98% and above. The ionic liquid extracted into an organic phase is back-extracted by potassium oxalate to obtain high-purity gold single element, so that the separation and collection of gold are realized. After back-extraction, the ionic liquid can have good cycle efficiency, so that efficient cyclic utilization of the ionic liquid is realized.

The invention relates to a method for producing [ 18 F]SiTATE, encompassing the following steps (a) Providing an eluent solution prepared by dissolving 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane and potassium oxalate in a solvent; (b) Winning [ 18 [F]Fluoride anions using the eluent solution to obtain a solution, [ 18 [F]Fluoride anions contains; (c) Removal of the solvent leaving a residue which[ 18 [F] Fluoride anions contain; and (d) Converting the residue with [ 19 F]SiTATE in an organic solvent to obtain [ 18 F]SiTATE.

A rapid detection method for ciprofloxacin in meat products based on enzyme-linked up-conversion fluorescence and a potassium titanyl oxalate acid system, which belongs to the field of antibiotic detection technology. The detection method comprises: mixing an enzyme-linked up-conversion nanoparticle solution with an aptamer-connected magnetized polydopamine solution to obtain a fluorescent-ultraviolet dual-signal sensor detection system; and integrating potassium oxalate acid and hydrogen peroxide to collectively establish a ciprofloxacin content detection fluorescence standard curve and colorimetric standard curve, signal values of the ultraviolet absorbance and the fluorescence intensity of a meat product sample liquid are measured, and the ciprofloxacin content in the meat product is calculated according to the fluorescence standard curve and the colorimetric standard curve.

The application discloses a welding rod for 1000MPa high-strength steel and a preparation method thereof. The welding rod comprises a coating and a welding core, and the coating is wrapped on the outside of the welding core. The coating powder comprises the following components in parts by weight: 30-35 parts of fluorite, 20-30 parts of dolomite, 5-8 parts of strontium carbonate, 2-5 parts of sodium titanium silicate, 5-10 parts of potassium oxalate, 5-10 parts of atomized ferrosilicon, 2-5 parts of titanium powder, 0.5-1.0 parts of lanthanum cerium fluoride, 1-5 parts of lithium carbonate, 1-2 parts of sodium carboxymethyl starch, 0.5-1.5 parts of copper powder and 8-15 parts of iron powder. The welding rod has excellent all-position welding process performance, the arc is stable during welding, fine droplet transition is presented, the molten slag has moderate fluidity, the welding spatter is small, and the weld formation is fine and beautiful.

This invention relates to the field of dichloromethane waste gas treatment technology, specifically disclosing a molten salt-assisted preparation method for ultra-microporous activated carbon used to remove dichloromethane. The method of this invention includes the following steps: urea, potassium oxalate, chloride salt and coconut shell carbonized material are mixed and ground in different proportions, and then activated at 800℃ for 60 min to obtain a series of ultra-microporous activated carbons. The preparation method provided by this invention can control the pore structure of activated carbon to obtain adsorption materials with excellent dichloromethane purification performance. The material synthesis is simple, the cost is low, and it has the conditions for large-scale production.

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.

The invention discloses a silver plating process for a lead frame of an integrated circuit, and relates to the technical field of electroplating processes. The invention discloses a silver plating process for an integrated circuit lead frame. The silver plating process sequentially comprises the steps of surface oil removal and degreasing, acid pickling, activation, copper plating, silver pre-plating, silver electroplating, annealing passivation and the like. In the step of silver electroplating, used silver electroplating liquid comprises a water-soluble silver salt compound with the mass concentration being 15-25 g / L, sodium thiosulfate with the mass concentration being 200-230 g / L, potassium metabisulfite with the mass concentration being 40-45 g / L, potassium oxalate with the mass concentration being 20-35 g / L, a stabilizer with the mass concentration being 0.35-1.2 g / L, a reducing agent with the mass concentration being 4-12 g / L, a brightening agent with the mass concentration being 0.5-0.8 g / L and a pH buffering agent with the mass concentration being 10-20 g / L according to silver ions. Specifically, the stabilizer is one or a mixture of two of a thiourea derivative or methylaminothiazole, and silver ions can be uniformly deposited on the surface of the lead frame at a stable speed in a silver electroplating liquid system taking sodium thiosulfate as a main complexing agent, so that the surface of a silver plating layer is smooth and flat and has good brightness; and meanwhile, good adhesiveness and thickness uniformity are achieved.

Disclosed herein are oral care compositions for improving oral health and / or desensitizing teeth. According to one aspect, there is provided an oral care composition having from about 2% to about 10% by weight of a potassium source comprising potassium nitrate, potassium citrate, potassium oxalate, and combinations thereof; an abrasive comprising calcium carbonate, calcium bicarbonate, or a combination thereof; a fluoride source; and a polyol, wherein all weight percentages are based on the total weight of the oral care composition. The oral care composition may be substantially free or free of silica abrasives.

The invention relates to a preparation method and application of oxaliplatin albumin nanoparticles, and the preparation method comprises the following steps: S1, reacting a dichloro (1, 2-diaminocyclohexane) platinum (II) solution with a silver nitrate solution, removing precipitate to obtain an oxaliplatin precursor ion solution, adding a sodium chloride solution, standing, and filtering to obtain a purified oxaliplatin precursor ion solution; and S2, mixing the purified oxaliplatin precursor ion solution with an albumin aqueous solution, adjusting the pH value to 4.5-5.5, adding a potassium oxalate solution to obtain a mixed solution, carrying out a stirring reaction, and carrying out ultrafiltration purification for a plurality of times to obtain the oxaliplatin albumin nanoparticles. According to the oxaliplatin albumin nanoparticle and the preparation method thereof, a quality controllable method is established by improving a preparation process and optimizing parameters, the oxaliplatin albumin nanoparticle which is low in impurity content, high in proportion of oxaliplatin in total platinum and high in encapsulation efficiency is prepared, a better treatment effect is shown in the aspect of tumor combined treatment, and the clinical application potential of oxaliplatin is improved.

The invention discloses a solution for removing a metal oxide layer and a preparation method and a removal method thereof, and the solution for removing the metal oxide layer comprises 3 to 5 parts of sodium tetraborate, 8 to 15 parts of allyl alcohol polyoxyalkylene ether, 3 to 7 parts of propylene glycol monomethyl ether, 2.5 to 4.5 parts of 2-bromo-2-nitropropane-1, 3-diol, 2 to 3 parts of sodium phytate, 4 to 6 parts of potassium oxalate, 5 to 6 parts of sodium gluconate and 10 to 15 parts of triethanolamine. 1-5 parts of hydrazine sulfate, 10-20 parts of dimethyl sulfoxide and the balance of water. According to the invention, the bond energy of Fe-O, Fe-S and the like is broken by utilizing the synergistic effect of unsaturated compounds, namely allyl alcohol polyoxyalkylene ether alkene and 2-bromo-2-nitropropane-1, 3-diol, and reducing components, namely sodium gluconate and hydrazine sulfate. According to the invention, a penetrating agent sodium tetraborate and a surfactant allyl alcohol polyoxyalkylene ether are used for uniformly accelerating bond breaking, and chelating agents potassium oxalate, sodium phytate and triethanolamine are used for stabilizing a solution and slowly corroding a base material. The hydrogen-absorbing coating has no corrosion to a base material, is close to zero hydrogen absorption, keeps the original mechanical properties unchanged, and has better practicability.

Oral care compositions for improving oral health and / or desensitizing teeth are disclosed herein. In accordance with an aspect, provided is an oral care composition having from about 2 to about 10 wt.% of a potassium source comprising potassium nitrate, potassium citrate, potassium oxalate, and a combination thereof; an abrasive comprising calcium carbonate, calcium bicarbonate or a combination thereof; a fluoride source; and a polyol, wherein all weight percentages are based on the total weight of the oral care composition. The oral care composition may be substantially free of or free of silica abrasives.

The invention discloses a potassium intercalation metallic transition metal chalcogenide nano array as well as a preparation method and application thereof. The method for preparing the potassium intercalation metallic transition metal chalcogenide nano array comprises the following steps: taking transition metal disulfide and a potassium source compound as raw materials, and forming the one-dimensional potassium intercalation metallic transition metal chalcogenide nano array on a substrate through chemical vapor deposition; wherein the potassium source compound is selected from one or more of potassium carbonate, potassium bicarbonate, potassium oxalate and potassium sulfate. The potassium intercalation metal transition metal chalcogenide nano array prepared by the method disclosed by the invention is flat in surface and can be used as a material of electrodes such as transistors and the like. According to the method of the invention, the resultant product can be adjusted to produce an ohmic contact or a Schottky contact by changing the composition of the precursor material as a raw material.

The application discloses a method for preparing a carbon molecular sieve with adjustable pores from heavy oil by binary activation and application thereof, and belongs to the technical field of biomass resource utilization and water treatment. The method comprises the following steps: (1) mixing heavy oil and a binary activation agent, and forming a carbon-containing precursor mixture after standing; wherein the binary activation agent is calcium citrate and potassium oxalate; (2) pyrolyzing and activating the carbon-containing precursor mixture under an inert atmosphere, and obtaining bio-activated carbon after cooling; and (3) washing and drying the bio-activated carbon to obtain a carbon molecular sieve. The application has the advantages of green environmental protection, convenient process and efficient production. The carbon molecular sieve has developed pore structure, concentrated pore size distribution and good adsorption characteristics, has a wide application prospect in water treatment, and realizes comprehensive disposal of resource utilization of two kinds of pollutants, namely, waste heavy oil and dye wastewater.