41 results about "Potassium thiocyanate" patented technology

The invention discloses a preparation method of a low-chlorine composite environment-friendly coal transportation anti-freezing agent, and belongs to the technical field of anti-freezing solutions. The anti-freezing solution is used for solving the technical problems of complex components and poor anti-freezing and metal corrosion resistance of the anti-freezing solution for coal transportation in the prior art. The preparation method of the low-chlorine composite environment-friendly coal transportation anti-freezing agent comprises the following step: uniformly mixing the compound pour point depressant, the modified corrosion inhibitor, the thickening stabilizer and the industrial water to prepare the low-chlorine composite environment-friendly coal transportation anti-freezing agent. The compound pour point depressant comprises an organic pour point depressant and an inorganic pour point depressant; the organic pour point depressant is obtained by reacting unsaturated azole, sodium methallyl sulfonate and fumaric acid; the unsaturated nitrogen is obtained by reaction of an intermediate B and benzaldehyde, and the intermediate B is obtained by reaction of triazole and ethyl chloroacetate; the modified corrosion inhibitor is obtained by carrying out a reaction on potassium thiocyanate, benzoyl chloride and chitosan vanillin Schiff base. The anti-freezing solution prepared by the invention has the advantages of moderate fluidity, good metal corrosion resistance and good anti-freezing performance.

The invention discloses a high-crystallinity carbon nitride nanosheet based on a heterogeneous fused salt interface as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. The preparation method comprises the following steps: carrying out hydrothermal reaction on a melamine solution or a melamine mixed solution to obtain a supramolecular precursor; mixing the supramolecular precursor with heterogeneous molten salt, and calcining in a protective atmosphere to obtain the high-crystallinity carbon nitride nanosheet; the heterogeneous molten salt is a mixture of potassium thiocyanate and potassium chloride. The heterogeneous fused salt interface is used as a reaction environment, ideal interface driving force is provided for directional assembly of a precursor and formation of a high-crystallization carbon nitride nanosheet, then preparation of a carbon nitride photocatalytic material with a controllable structure and excellent performance is achieved, and an illumination reaction is carried out in an air environment to catalyze production of hydrogen peroxide.

The invention discloses synchronous test paper for Fe < 3 + > and Fe < 2 + > as well as a preparation method and application of the synchronous test paper, and effectively solves the problem that high-concentration Fe < 3 + > and Fe < 2 + > in a boiler chemical cleaning solution are difficult to rapidly, accurately and simultaneously detect. The detection test paper is provided with isolated first and second color developing regions, provides an independent space for Fe < 3 + > and total iron detection, and is anti-interference and accurate. A potassium thiocyanate-hydrochloric acid color developing agent is specially used for measuring Fe < 3 + > in the first color developing area, a phenanthroline-ascorbic acid color developing agent is used for measuring total iron in the second color developing area, and the concentration of Fe < 2 + > is calculated in a combined mode. A standard colorimetric card is matched, color blocks accurately correspond to the concentration range (0-5000 mg / L), the common iron ion concentration is covered, and a comparison basis is provided for detection. During detection, information can be rapidly and visually obtained by comparing the color of the color developing area with the color chart, operation is easy and convenient, complex equipment and professionals are not needed, and field requirements are met. And the scheme is resistant to interference of high-concentration and complex components, and the result is real and reliable.

The invention discloses a preparation method of a potassium-doped nitrogen oxidation phosphorescent catalyst, and belongs to the technical field of photocatalytic material preparation. The method comprises the following steps: by taking phosphorus oxynitride and potassium thiocyanate as raw materials, grinding and mixing, carrying out molten salt reaction at 400-600 DEG C for 1-5 hours, and cooling, washing and drying a reaction product to obtain the potassium-doped phosphorus oxynitride crystal. The method is simple in process, mild in reaction condition, low in cost and easy for large-scale production. Through potassium element doping, the visible light absorption range of phosphorus oxynitride is effectively widened, the recombination rate of photo-induced electron-hole pairs is remarkably reduced, and the carrier separation and transmission efficiency is improved, so that the photocatalytic activity of the material is greatly improved. The prepared K-PON photocatalyst has wide application prospects in the fields of photocatalytic reduction of uranium-containing wastewater, degradation of organic pollutants, energy conversion and the like.

This invention discloses a dimerized triarylmethane compound for blue photoresist color paste and its synthesis method. The compound is a dimerized blue triarylmethane compound A, which is prepared by the following steps: (1) reacting reactant B with diacid chloride as an acylation reagent to obtain intermediate C; (2) removing the Boc group from intermediate C to obtain intermediate D; (3) cyclizing intermediate D with potassium thiocyanate and acyl chloride reagent to obtain intermediate E; (4) reacting intermediate E with 4,4-bis(diethylamino)benzophenone to obtain F; (5) salting intermediate F to obtain the target dimerized triarylmethane compound A. The dimerized triarylmethane compound of this invention has excellent color performance and is suitable for blue photoresist color paste. It can significantly improve the brightness, transparency, contrast and dispersibility of the color paste, while also possessing high hiding power, strong tinting strength and good thermal and light stability.

The application belongs to the technical field of fluorocarbon surfactant application, and particularly discloses a synthesis method of sodium perfluorohexylethyl sulfonate, which comprises the following steps: (1) under the protection of nitrogen, perfluorohexylethyl iodine, potassium thiocyanate and a phase transfer catalyst are added into water and stirred to react, an organic layer is separated, and rotary evaporation is performed to obtain perfluorohexylethyl thiocyanate; (2) the perfluorohexylethyl thiocyanate is added into water and heated, and then chlorine is continuously introduced to stir to react, and filtration separation is performed to obtain perfluorohexylethyl sulfuryl chloride; and (3) the perfluorohexylethyl sulfuryl chloride is added into sodium hydroxide water solution drop by drop, and stirred to react, and after filtration, water washing, recrystallization and drying, the sodium perfluorohexylethyl sulfonate is obtained. The sodium perfluorohexylethyl sulfonate has high yield and high purity, has excellent surface activity, has excellent compounding performance with a hydrocarbon surfactant, has very good thermal stability, salt resistance and chemical stability, and meets the environmental protection requirements.

The invention belongs to the technical field of medicinal chemistry, and discloses a synthesis method of a flutomil compound, which comprises the following steps: (1) taking 4-fluoromethylbenzylamine and dihydroxy acetone as raw materials, and reacting with potassium thiocyanate in an acidic acetonitrile solution to synthesize an intermediate A; (2) carrying out oxidative desulfurization on the intermediate A and 2-6eq of peroxidant sodium nitrite in an acidic solvent to prepare an intermediate B; (3) further oxidizing the intermediate B into an intermediate C; and (4) reacting the intermediate C in the reaction mixed solution with n-heterocyclic carbene under a DBU alkaline condition to generate an active intermediate, and then degrading the active intermediate into the flutomi ester compound. The synthesis route is high in atom utilization rate, simple in post-treatment, free of high temperature and high heat in the reaction process, less in reaction waste liquid and low in environmental protection pressure, and compared with original literature patents, the reaction steps are few, reagents are cheap, and the process route is easy to implement, economical and efficient.

The invention discloses a synthesis method of a C-13 labeled mercapto triazole derivative. The synthesis method comprises the following steps: (1) carrying out a reaction on C-13 potassium cyanide and S8 to prepare C-13 potassium thiocyanate; (2) carrying out nucleophilic substitution reaction on C-13 potassium thiocyanate and a benzyl bromide compound to obtain a compound 1; (3) carrying out nucleophilic addition reaction on the compound 1 and formylhydrazine to obtain a compound 2; (4) further cyclizing the compound 2 under an alkaline condition to obtain a compound 3; and (5) carrying out derivative reaction on the compound 3 to obtain a C-13 labeled target compound. According to the synthesis method, multi-step continuous reaction is adopted, operation is easy and convenient, the yield is high, and the utilization rate of the C-13 marker is greatly increased.

This invention discloses an electrochemical synthesis method for methylthiopyrazole derivatives, comprising the following steps: The electrochemical synthesis method for methylthiopyrazole derivatives provided by this invention is a novel electrochemical synthesis method for constructing C-H methylthiolation of pyrazole derivatives using potassium thiocyanate as the sulfiding reagent and alcohol as the methylating reagent. Compared with traditional preparation methods, thiocyanate as the sulfiding reagent is not only simple and readily available, but also avoids the addition of external electrolytes. Simultaneously, the electrochemical conditions are milder and more sustainable, requiring no metal catalysts or oxidants, avoiding the use of highly toxic sulfur reagents, and exhibiting green and efficient characteristics.

The application belongs to the technical field of bulk drug preparation and relates to a synthesis method of Filgotinib. The synthesis method of Filgotinib takes bromobenzaldehyde (compound 1) as a starting material, and boron esterification reaction is carried out under the catalysis of palladium to obtain intermediate 3. Intermediate 3 is subjected to Suzuki coupling reaction with 2-amino-6-bromopyridine (compound 4) to obtain intermediate 5. Intermediate 5 is reacted with thiomorpholine-1,1-dioxide (compound 6) to generate intermediate 7. Intermediate 7 is condensed with cyclopropylcarbonyl chloride (compound 8) and potassium thiocyanate (compound 9) to obtain intermediate 10. Intermediate 10 is subjected to cyclization with hydroxylamine hydrochloride (compound 11) to obtain the final product Filgotinib. The synthesis method solves the problems of the prior art, such as difficulty in obtaining starting materials, harsh reaction conditions and complicated process route, and has the advantages of a short synthesis route, easy availability of materials used in the reaction and simple reaction operation.

The application discloses a copper plating composition and a chemical copper plating process, and relates to the field of copper plating compositions, which is composed of the following components: a copper salt providing divalent copper ions; a complexing agent for complexing the divalent copper ions; a stabilizer for stabilizing the copper plating composition, which is selected from at least one of the group consisting of 2,2'-dipyridyl, potassium selenocyanate, potassium thiocyanate and 2-mercaptobenzimidazole; a reducing agent for reducing the complexed divalent copper ions to metallic copper; an alkaline adjusting agent for adjusting the pH value of the composition to an alkaline range suitable for chemical copper plating; and a solvent. The process stability and product yield are improved: through the optimized combination of the core stabilizer, the complexing agent and the reducing agent, the self-decomposition of the copper plating bath is effectively inhibited, the process stability is significantly enhanced, the incidence of key defects such as backlight defects in the metalization of the circuit board hole is greatly reduced, and the high yield of the final product is ensured.

The application discloses a kind of carbon catalytic oxidation of ozone cooperates with photocatalysis and restricts enhancement carbon nitride nanotube material of biochar, mainly by alkali modification green algae base biochar and functional group doped carbon nitride nanotube is made, wherein functional group doped carbon nitride nanotube is melamine, cyanuric acid as raw material, by urea, N-acetyl ethanolamine, potassium thiocyanate, ammonium chloride, N, N-dimethylformamide, N, N-dimethylacetamide one and multiple functional group doping is prepared.The above-mentioned material has adsorption, ozone catalytic oxidation, visible light photocatalysis and ozone catalytic oxidation cooperates with visible light photocatalytic activity, can be applied to water pollution control field.The material provided in the application is made of non-metal material, without secondary pollution, simple process, without high temperature and high pressure and other special environment, raw material quantity is easy to obtain, low in cost, its application ozone catalytic oxidation cooperates with photocatalysis system can be used as a kind of new technology to promote water pollution treatment process.

The invention discloses an adhesive for an amorphous strip and a preparation method of the adhesive, and relates to the field of adhesives. The invention discloses an adhesive for an amorphous strip. The adhesive comprises the following raw materials in parts by weight: 55-65 parts of epoxy resin; 15-23 parts of an episulfide epoxy resin; 8 to 15 parts of alkyl glycidyl ether with 12 to 14 carbon atoms; 3-7 parts of calcium carbonate powder; 0.8 to 1.5 parts of a titanate coupling agent; 2-5 parts of a thermal curing agent; the epoxy resin is prepared from bisphenol F type epoxy resin and episulfide epoxy resin through a reaction of bisphenol A type epoxy resin and potassium thiocyanate. The adhesive provided by the invention has good bonding strength, thermal stability and excellent water resistance to the amorphous strip, can meet the high-temperature and high-humidity environment requirements of the amorphous strip, and does not affect the soft magnetic performance of the amorphous strip.

The invention discloses a method for detecting the content of ferric iron in lubricating oil, and belongs to the technical field of lubricating oil quality detection. The method comprises the following steps: mixing 0.4-0.6 g of lubricating oil to be detected with 8-12 ml of diethyl ether to obtain a mixed solution; adding 0.15-0.25 ml of concentrated hydrochloric acid and 1.8-2.2 ml of a potassium thiocyanate solution into the mixed solution, oscillating, and standing for 4-6 minutes to generate an iron thiocyanate complex; and measuring the absorbancy of the ether phase by using a portable spectrophotometer, and calculating the content of the ferric iron in combination with a standard curve method. According to the method, laboratory fixing equipment is not needed, detection can be completed within 8-35 minutes, the oil sample dosage is only 0.4-0.6 g, the relative error is smaller than or equal to 2.35%, and the method is adaptive to low / high-viscosity lubricating oil, can be applied on site and in a laboratory and provides accurate data support for equipment operation and maintenance.

This invention belongs to the field of functional coating technology, specifically relating to an electrolyte for electrodeposition preparation of FeCoNiCu high-entropy alloy coatings and its application. The electrolyte includes FeSO4·7H2O, CoSO4·7H2O, NiSO4·6H2O, CuSO4·5H2O, H3BO3, sodium citrate, citric acid, NaCl, and additives. The additives are selected from at least one of o-phenanthroline, o-chlorobenzaldehyde, potassium thiocyanate, sodium 3-mercapto-1-propanesulfonate, and 4-(2-pyridinium azo)resorcinol. This electrolyte can prepare FeCoNiCu high-entropy alloy coatings with similar atomic ratios of metal elements in a one-step electrodeposition process, achieving co-deposition of four elements. The addition of additives can improve cathodic polarization, refine grains, and prepare a dense coating exhibiting excellent wear resistance. Simultaneously, the process is simple, low-cost, environmentally friendly, non-toxic, and safe.

The invention discloses a method for detecting the total iron content of lubricating oil, and solves the problems of no field detection method and large detection error in the prior art. The method comprises the following steps: weighing 0.1-1.0 g of an oil sample, placing the oil sample in a 40-60 ml quartz beaker, evaporating at 250-350 DEG C, and ashing at 600-800 DEG C; adding 1.5-2.5 ml of concentrated hydrochloric acid, boiling for 8-12 minutes, and carrying out acid leaching; transferring to a 8-12ml test tube, adding potassium persulfate and potassium thiocyanate to fix the volume to 8-12ml, and standing for 4-6 minutes; and carrying out colorimetric detection by using a 480-490nm spectrophotometer. The method is simple to operate, accurate and stable, adapts to fields and laboratories, and can quickly guide oil regeneration treatment.

The present invention discloses a gun-black tin-nickel alloy electroplating and electrolytic protection process. The electroplating process comprises: 240-280 g / L potassium pyrophosphate, 50-60 g / L nickel chloride hexahydrate, 7-9 g / L stannous chloride dihydrate, 1-2 g / L lanthanum chloride or praseodymium chloride, 13-18 g / L potassium thiocyanate, 0.6-1.8 g / L methionine, 20-30 g / L ammonium citrate, 4-6 g / L disodium ethylenediaminetetraacetic acid, a pH range of 7.8-8.2, a plating bath temperature of 35-40°C, a cathode current density of 1-3 A / dm2, and a cathode travel of 3-5 m / min. The electrolytic protection process is as follows: 2-5 g / L cerium chloride, 2-5 g / L sodium molybdate, 15-30 g / L sodium hydroxyethylidene diphosphonate, 100-150 g / L anhydrous potassium carbonate, pH range 11-13, room temperature operation, cathode current density 0.5-1.2 A / dm², using the plated part as the cathode and the titanium plate as the anode, and electrolysis for 60-120 seconds. The prepared gunmetal black tin-nickel alloy plated part was subjected to a neutral salt spray test for 96 hours in accordance with GB / T 10125-2021 "Artificial Atmosphere Corrosion Test Salt Spray Test", and no corrosive products were generated on the surface of the coating. The gunmetal black tin-nickel alloy electroplating and electrolysis process of the present invention improves the corrosion resistance of the coating and solves the high pollution problem of the dichromate electrolytic protection method.

Disclosed is a buffer for enhancing enzymatic cleavage activity of a Cas protein, 5 comprising one or more components selected from the group consisting of: a salt selected from the group consisting of monopotassium phosphate (KH₂PO₄), sodium formate (HCOONa), calcium acetate (Ca(C₂H₃O₂)₂), sodium acetate (CH₃COONa), ammonium sulfate ((NH₄)₂SO₄), potassium thiocyanate (KSCN), calcium chloride (CaCl2), sodium chloride (NaCl), Nickel(II) nitrate (Ni(NO3)2), lithium sulfate (LiSO4); an organic solvent 0 selected from the group consisting of Tween 20, Dithiothreitol (DTT), Phenylmethylsulfonyl fluoride (PMSF), 2-Methyl-2,4-pentanediol (MPD), acetone, dimethylsulfoxide (DMSO), ethylene glycol, methanol, 2-propanol, EDTA, urea; and a protein which is casein. Also disclosed is a detection kit for a nucleic acid, comprising the buffer as disclosed herein, a Cas protein and a crRNA. Further disclosed is a method 5 of detecting a nucleic acid in a sample by CRISPR-cas, using the detection kit as disclosed herein.

The application provides a waste spinning substitute fuel treatment and chloride ion detection method for cement production, and belongs to the technical field of substitute fuel.The waste spinning is crushed, mixed with zinc oxide and alkali in water at 35-50 DEG C, filtered, dried, and waste spinning substitute fuel for cement production is obtained.The waste spinning is treated in a reasonable way, the heat value is kept unchanged, the chloride ion content is greatly reduced, and the control of chloride ion in the substitute fuel is realized;when the treated waste spinning substitute fuel is used for cement production, the clinker chloride ion content can be kept within a controllable range.In addition, the chloride ion detection method provided by the application detects the chloride ion content by using existing detection equipment and conventional chemicals, without the need to additionally purchase equipment, reduces the use of dangerous chemicals such as potassium thiocyanate and ferric ammonium sulfate, and is simple to operate, cost-saving and space-saving.

This invention discloses a method for preparing a low-chlorine composite environmentally friendly antifreeze agent for coal transportation, belonging to the field of antifreeze technology. This invention addresses the technical problems of existing antifreeze agents for coal transportation, such as complex composition and poor antifreeze and metal corrosion resistance. The method for preparing a low-chlorine composite environmentally friendly antifreeze agent for coal transportation includes the following steps: mixing a compound pour point depressant, a modified corrosion inhibitor, a thickening stabilizer, and industrial water. The compound pour point depressant includes organic and inorganic pour point depressants; the organic pour point depressant is obtained by reacting unsaturated nitrile, sodium methyl methacrylate, and fumaric acid; the unsaturated nitrile is obtained by reacting intermediate B with benzaldehyde, and intermediate B is obtained by reacting triazole with ethyl chloroacetate; the modified corrosion inhibitor is obtained by reacting potassium thiocyanate, benzoyl chloride, and chitosan vanillin Schiff base. The antifreeze prepared by this invention has the advantages of moderate fluidity, good metal corrosion resistance, and good antifreeze performance.

The invention discloses application of potassium-doped nitrogen oxidation phosphorescence catalysis on acidic uranium-containing wastewater, and belongs to the technical field of photocatalytic materials. According to the application, the K-PON photocatalyst is directly put into acidic uranium-containing wastewater with the pH value of 0.5-6 and is used for reducing and removing U (VI). The K-PON is prepared by mixing and grinding phosphorus oxynitride and potassium thiocyanate according to a mass ratio of 1: (0.5-4), and calcining at 400-600 DEG C for 1-5 hours. The core advantage of the invention is that the prepared K-PON photocatalyst not only can efficiently reduce U (VI) under the illumination condition, but also has the unique memory photocatalysis characteristic, can continuously release stored electrons in a dark environment, realizes the continuous reduction of U (VI), and has a good application prospect. The problems that a traditional photocatalysis technology depends on continuous illumination and is inactivated in a strongly acidic environment are solved, and a new material and a new method are provided for efficient and all-weather treatment of the acidic uranium-containing wastewater.

The invention discloses a dimeric triarylmethane compound for blue photoresist color paste and a synthesis method of the dimeric triarylmethane compound. The compound is a dimerization blue triarylmethane compound A, and is prepared by the following steps: (1) taking diacyl chloride as an acylation reagent to react with a reactant B to obtain an intermediate C; (2) removing Boc groups from the intermediate C to obtain an intermediate D; (3) carrying out cyclization on the intermediate D, potassium thiocyanate and an acyl chloride reagent to obtain an intermediate E; (4) reacting the intermediate E with 4, 4-bis (diethylamino) benzophenone to obtain F; and (5) carrying out salt exchange on the intermediate F to obtain the target dimeric triarylmethane compound A. The dimerized triarylmethane compound has excellent colored light performance, is suitable for blue photoresist color paste, can remarkably improve the brightness, transparency, contrast ratio and dispersity of the color paste, and has high covering power, strong tinting strength and good thermal stability and light stability at the same time.

This invention discloses a polyethersulfone (PES) ammonia separation membrane based on imidazolium-cobalt coordination synergy and its preparation method, comprising the following steps: using polyethersulfone as a raw material, it undergoes a chloromethylation reaction under anhydrous conditions to introduce a -CH2Cl active site into the aromatic ring side chain of polyethersulfone, thereby obtaining chloromethylated polyethersulfone; the chloromethylated polyethersulfone is subjected to a nucleophilic substitution reaction with an imidazolium compound to obtain imidazolium-functionalized polyethersulfone with chloride ions as the counter ion; and after membrane formation, the imidazolium-functionalized polyethersulfone membrane is immersed in a mixed solution of potassium thiocyanate and cobalt chloride, utilizing the in-situ formed cobalt thiocyanate coordination anion to counteract the chloride ion. ‑ By performing a displacement reaction, a polyethersulfone ammonia separation membrane based on imidazolium-cobalt coordination synergy is obtained. The polymer membrane obtained in this invention has a stronger selective dissolution and enhanced transfer capability for ammonia, and can achieve efficient and stable ammonia enrichment in the separation of ammonia-containing mixed gases.

The application provides a precipitant for precipitating a silver base body, a preparation method and application, and the precipitant comprises potassium thiocyanate, an auxiliary complexing agent, trace rare earth elements, a synergist and trace selenium compounds; wherein the auxiliary complexing agent is at least one of pyrrolidone, N-ethyl-N-methyl aminoacetic acid or a combination thereof; the trace selenium compounds are sodium selenite or sodium selenate, the addition amount of the trace selenium compounds is 0.001%-0.05% of the total mass of the precipitant; and the mass ratio of the auxiliary complexing agent to the trace selenium compounds is 20:1-60:1. Through optimization of component allocation and auxiliary additives, rapid precipitation of silver elements is realized, and the application is suitable for various scenes such as element content analysis of silver alloy products and harmful element migration amount detection of silver tableware.

The invention provides a method, a device and a system for evaluating the corrosion resistance of a zinc-aluminum coating. The method comprises the following steps: dividing a to-be-detected zinc-aluminum coating into a developing area and a sampling area; gel test paper is attached to the color development area, the color development time and the color depth are determined, and the gel test paper comprises potassium thiocyanate and sodium fluoride; coating surface powder is obtained from the sampling area, and the zinc content and the aluminum content of the to-be-detected zinc-aluminum coating are determined by applying the coating surface powder; determining an anti-corrosion performance evaluation result according to the anti-corrosion performance evaluation model, the developing time, the color depth, the zinc content and the aluminum content; the anti-corrosion performance evaluation model is obtained based on batch training samples and actual anti-corrosion index fitting, the training samples comprise the developing time, the color depth, the zinc content and the aluminum content of the historical zinc-aluminum coating, and the reliability of anti-corrosion performance evaluation of the zinc-aluminum coating can be improved on the basis of ensuring the anti-corrosion performance evaluation efficiency of the zinc-aluminum coating.

The invention relates to the technical field of separation and purification of natural functional components, in particular to a resin cross-linking agent, acylthiourea-containing rosin-based adsorption resin and a preparation method and application of the acylthiourea-containing rosin-based adsorption resin. The preparation method of the cross-linking agent comprises the following steps: reacting maleated rosin with SOCl2 to obtain an intermediate product A, reacting the intermediate product A with potassium thiocyanate, reacting the intermediate product B with aniline-o-methylaniline to obtain an intermediate product C, and reacting the intermediate product C with ethyl acetate and hydroxyethyl acrylate to obtain the cross-linking agent NMDMR. The adsorption resin is synthesized by taking NMDMR as a cross-linking agent and diethylbenzene (DVB) and methacrylic acid (MAA) as monomers through a suspension polymerization method. The PNS adsorption capacity of the obtained rosin-based resin is 221.11 mg / g, and the rosin-based resin has good adsorption separation and purification capacity on PNS, and is a renewable and efficient rosin-based resin adsorbent.

The invention discloses high-crystallinity carbon nitride colloid as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing guanidine hydrochloride and potassium thiocyanate in an air-containing closed environment, calcining at 520-575 DEG C, and adding water to disperse. The specific raw materials guanidine hydrochloride and potassium thiocyanate are adopted, the product prepared through a specific process has high crystallinity, hydrophilicity and stability and further has excellent photocatalytic performance, and especially in catalysis of hydrogen production through water decomposition, the average hydrogen production activity within 5 h reaches up to 235.4 micromol.h <-1 > (17.1 times of that of bulk phase carbon nitride).

The application discloses a method for improving electrochemical carbon dioxide reduction to produce methane under acidic conditions of a copper-based catalyst by using potassium thiocyanate. The method adds potassium thiocyanate into an electrolyte for electrochemical carbon dioxide reduction under acidic conditions of a copper-based catalyst, or simultaneously adds a potassium ion-containing salt and a thiocyanate ion-containing salt, and the existing potassium thiocyanate salt in the electrolyte can effectively regulate the electronic structure of a Cu surface, promote deep hydrogenation of an intermediate in a carbon dioxide reduction reaction, thereby improving the selectivity of methane synthesis, and meeting the needs of industrialized carbon dioxide electro-reduction to produce methane.

The invention relates to the technical field of silver-coated copper powder, in particular to dendritic silver-coated copper powder with a high-temperature-resistant characteristic and a preparation method of the dendritic silver-coated copper powder. Comprising 60-80 parts of copper powder; 22 to 24 parts of silver nitrate; 29-36 parts of a reducing agent; 3-4 parts of a dispersant; 100 parts of a pickling solution; 100 parts of an alkali wash solution; 1-2 parts of a complexing agent; 5 parts of a surface modifier; 200 parts of ethanol; the potassium thiocyanate and the glutamic acid are introduced, the potassium thiocyanate can form a more stable protection layer on the surface of the silver-coated copper powder, the oxidation temperature of the silver-coated copper powder is greatly increased, the glutamic acid can improve the distribution uniformity of silver on the surface of the copper powder, and the oxidation temperature can also be increased.