1186 results about "Acid treatment" patented technology

The invention discloses a composite electrode material for removing uranium through photoelectrocatalysis and a preparation method and application of the composite electrode material, and belongs to the technical field of catalytic materials and wastewater treatment.The preparation method of the composite electrode material comprises the following steps that a ZIF-8 material, copper salt and ferric salt are mixed, and a first metal composite material is prepared; reacting the first metal composite material with a KOH solution to prepare a second metal composite material; carrying out carbonization treatment on the second metal composite material, and then carrying out acid treatment by using acid to obtain a bimetallic atom catalytic material; the preparation method comprises the following steps: dispersing a bimetallic atom catalytic material and a g-C3N4 material in a mixed solution containing phytic acid and a Nafion solution to obtain catalyst ink; and coating the catalyst ink on a substrate, and carrying out illumination drying to obtain the composite electrode material. According to the composite electrode material, under the synergistic effect of the bimetallic single atomic cluster catalyst and g-C3N4, respective advantages are fully exerted, and efficient deposition removal of uranium is achieved.

The invention discloses a method for preparing a lithium-copper composite negative electrode by utilizing lithium slag and application, and the preparation method of the negative electrode comprises the following steps: adding the lithium slag with certain concentration after removing impurities such as Ca < 2 + >, Mg < 2 + > and Fe < 3 + > through acid treatment into metal lithium in a molten state, and fully stirring until the reaction is complete; and coating the molten metal lithium obtained after the reaction on a current collector to obtain the modified lithium metal negative electrode plate. The prepared lithium-copper composite negative electrode has a lithium-loving 3D frame structure, volume expansion in the circulation process can be inhibited, lithium oxide, lithium aluminum alloy and lithium silicon alloy existing on the 3D frame structure can serve as lithium-loving sites for uniform lithium ion deposition, lithium dendrite growth is inhibited, and long-term stable circulation of the lithium metal negative electrode is promoted.

The invention relates to the technical field of acidic wastewater titrimetric analysis, and discloses an automatic sampling titrimetric analysis method based on a copper smelting acidic wastewater treatment link, which comprises the following steps: collecting waste acid to obtain a waste acid sample; carrying out titration treatment on the waste acid sample to obtain a waste acid sample image after the titration reaction is finished, and carrying out sediment outline extraction on the waste acid sample image to generate sediment coagulation complexity; according to the method, automatic sampling titration is combined with image analysis, precipitation coagulation complexity and arsenic specific hue separation degree are extracted, a precipitation effectiveness index and an arsenic residue risk coefficient are generated through dynamic fusion, arsenic precipitates and other precipitates in similar forms are accurately distinguished by utilizing precipitate contour features and arsenic specific hue in an HSV color space, and the arsenic content is accurately determined. The method has the advantages that spectral signal superposition interference is avoided, and the arsenic residual state can be accurately reflected, so that whether arsenic removal is qualified or not is reliably judged, the accuracy and safety of waste acid treatment are improved, and the quality of water reuse is guaranteed.

The invention discloses a perfluorinated compound adsorption material and a preparation method thereof. Comprising the following steps: 1) placing moso bamboo in a high-temperature carbonization furnace for carbonization treatment, after carbonization is completed, taking out bamboo charcoal, carrying out acid treatment to remove surface impurities and part of ash, then repeatedly washing the bamboo charcoal with deionized water until the bamboo charcoal is neutral, and finally drying the bamboo charcoal to obtain pretreated bamboo charcoal; and 2) putting the pretreated bamboo charcoal into a chitosan acetic acid solution to load chitosan on the surface of the bamboo charcoal, repeatedly washing the bamboo charcoal with deionized water to remove unloaded chitosan, and then drying to obtain the perfluorinated compound adsorption material. The prepared adsorption material has high adsorption capacity and selectivity on perfluorinated compounds, the adsorption performance of the adsorption material on the perfluorinated compounds is improved by modifying the bamboo charcoal, and the adsorption capacities of the adsorption material on perfluorooctanoic acid and perfluorooctane sulfonic acid can reach 400 mg / g and 450 mg / g respectively.

The invention discloses a recombinant human IV-type collagen as well as a preparation method and application thereof, and belongs to the field of bioengineering and protein engineering. According to the invention, three recombinant human IV type collagen new molecules are designed and screened on the basis of a part of sequences in a human IV type collagen alpha1 chain, soluble expression of a target protein is realized by using an escherichia coli system, and the recombinant collagen with the purity of more than 98% can be obtained through nickel column purification and acid regulation treatment. The recombinant collagen provided by the invention has good cell migration promotion activity and cell adhesion activity, and can be widely applied to the fields of tissue engineering, medical equipment, cosmetics, health care products and the like.

The invention discloses a La < 3 + >-doped lithium manganese oxide lithium ion sieve as well as a preparation method and application thereof, and belongs to the technical field of salt lake lithium extraction. The preparation method comprises the following steps: by taking Mn2O3 and LiOH as raw materials, carrying out hydrothermal reaction to generate LiMnO2, mixing the LiMnO2 with La2O3, grinding and calcining to form a La < 3 + >-doped spinel structure precursor La-LMO, and carrying out acid pickling to prepare La-HMO. La < 3 + > replaces part of Mn < 3 + >, the average valence state of manganese is improved, meanwhile, the structural stability of the manganese is enhanced through the high bond energy of La-O bonds, the number of exposed manganese atoms is reduced, manganese solution loss caused by Mn < 3 + > disproportionation reaction in the acid treatment process is effectively inhibited, the adsorbed oxygen content and active sites are increased, and the lithium ion adsorption capacity is remarkably improved. The material has high-selectivity adsorption capacity on lithium ions in salt lake brine in a strong alkaline environment, the manganese solution loss rate is obviously lower than that of traditional HMO, the cycle life is remarkably prolonged, and the industrial application potential is remarkably improved. The preparation process of the lithium ion sieve is simple, the raw material cost is low, and the technical bottlenecks that an existing manganese-based lithium ion sieve is poor in structural stability and high in manganese solution loss are solved.

The invention discloses a preparation method of an in-situ nano manganese dioxide and zeolite composite material and application of the composite material in removal of metal ions and micropollutants in water, and belongs to the field of drinking water source water treatment. The preparation method of the in-situ nano manganese dioxide and zeolite composite material comprises the following steps: 1, pretreating natural zeolite; 2, preparing acid-treated zeolite; and 3, preparing the in-situ nano manganese dioxide and zeolite composite material. According to the invention, an impregnation-calcination method is adopted, MnO2 is loaded in situ on the pore channels and the surface of the acid-treated zeolite, and uniform growth of nanometer and sub-nanometer layered manganese dioxide is realized based on the nanometer pore channel structure of the zeolite. According to the structure, the reactivity of various oxidants represented by monopersulfate is stimulated, macromolecules and background substances with the same electric property are excluded through the confinement effect, interference of non-target objects on the oxidation process is reduced, and a new thought and technical support are provided for solving the problem of combined pollution of drinking water.

The invention relates to the technical field of mineralogy, in particular to a complex iron mineral distinguishing and quantifying method and an iron mineral content analysis method, which innovatively combines chemical dissolution, automatic mineralogy analysis and a micro-area magnetic verification technology to realize distinguishing and quantifying of complex iron minerals. According to the analysis method, a closed and mutual verification analysis system is formed, acid treatment of carbonate, automatic mineralogy analysis of residual minerals, micro-area magnetic verification correction of misjudgment of maghemite, element surface scanning verification of mineralogy total quantification accuracy and a final calculation result, and closed verification of the total iron content of chemical analysis are combined, and therefore the comprehensive performance of the magnetic separation system is improved. The reliability of a final result is ensured and standardized popularization and application are facilitated.

The invention relates to a nano silicon carbide whisker and a preparation method thereof, and the preparation method comprises the following steps: (1) carrying out acid process treatment on fly ash by using an acid solution, so that the content of key impurity elements in the fly ash accounts for 2-11% of the total mass of the treated fly ash, and obtaining acid-treated fly ash; (2) mixing the acid-treated fly ash with a first carbon source to obtain a mixture; and (3) covering the mixture with a second carbon source, roasting in a reducing atmosphere to obtain a roasted material which comprises a nano silicon carbide whisker layer and a total impurity layer positioned below the silicon carbide whisker layer, and removing the total impurity layer to obtain the nano silicon carbide whisker. According to the preparation method, the low-cost fly ash is taken as a raw material, the advantages of low preparation cost and relatively high product yield can be taken into account through the synergistic effect of moderate acid treatment, raw material position setting and roasting in the reducing atmosphere, and good morphology and relatively high purity of the nano silicon carbide crystal whiskers are ensured.

The invention relates to the technical field of silicon-aluminum aerogel preparation, in particular to a method for preparing high-temperature-resistant silicon-aluminum aerogel by using a coal gangue one-step method, which comprises the following steps: S1, crushing, grinding and sieving coal gangue, mixing the coal gangue with an alkaline solid, and calcining to obtain alkali fusion powder; s2, the alkali fusion powder is subjected to acid treatment and suction filtration, and a silicon-aluminum solution is obtained; s3, adding polystyrene-coated zirconium oxide particles into the silicon-aluminum solution, and sequentially carrying out gelation, primary aging, solvent washing, water washing and secondary aging; s4, washing, replacing and modifying the gel; and S5, drying the hydrophobic wet gel obtained in the step S4 at normal pressure to obtain the silicon-aluminum aerogel. The silicon-aluminum aerogel prepared by the method has the advantages of low density, good thermal stability, high specific surface area, strong hydrophobic property and high strength.

The invention provides a method for preparing a zirconium boride ceramic material through pressureless sintering, and belongs to the technical field of zirconium boride ceramics. The method comprises the steps of preparing zirconium boride composite powder, modifying silicon carbide nanowires and mixing and sintering. The method for modifying the silicon carbide nanowire comprises the steps of acid treatment and modification, the modification step comprises the following steps: adding aluminum isopropoxide into absolute ethyl alcohol, adding a nitric acid solution, stirring for 1.5-2.0 hours at the temperature of 60-63 DEG C, adding the acid-treated silicon carbide nanowire, carrying out ultrasonic dispersion and water bath evaporation, then drying, putting into a muffle furnace, and carrying out heat preservation for 2.0-2.2 hours at the temperature of 490-500 DEG C to obtain a modified silicon carbide nanowire; the ceramic material prepared by adopting the method disclosed by the invention is high in density, good in mechanical property and excellent in high-temperature oxidation resistance and stability in a complex environment.

The invention belongs to the technical field of catalysts, and discloses an ammonia decomposition hydrogen production catalyst and a preparation method and application thereof. The preparation method of the catalyst for hydrogen production through ammonia decomposition comprises the following steps: in an inert atmosphere, successively carrying out calcination and acid treatment on a carbon carrier to prepare an acid-treated graphitized carbon carrier; adding a ruthenium precursor, a rare earth element precursor and an alkali metal precursor into ethanol, and mixing to prepare a mixed solution; then adding a graphitized carbon carrier into the mixed solution, and mixing; then adding urea and a surfactant, continuously mixing, and standing to obtain a solid precipitate; and finally, carrying out heat treatment on the solid precipitate in a reducing atmosphere. The catalyst takes a highly graphitized carbon material as a carrier, an alkali metal is doped to provide an alkaline environment, and a rare earth metal oxide and Ru form dual-assistant synergistic regulation of an interface, so that low-temperature high-activity ammonia decomposition hydrogen production and long-acting stable operation are realized.

A method for preparing a high-purity yeast β-glucan, comprising the following steps: treating a yeast cell wall mixed liquid by adding amylase at a certain temperature, then adjusting the pH, and treating the mixed liquid by adding lipase at a certain temperature; adding an alkali and a nonionic surfactant, carrying out heating and thermal insulation treatment, and cooling to obtain an alkali-treated liquid; washing and separating the alkali-treated liquid, adding water to a precipitate, then adding an acid to adjust the pH to 3-5, carrying out heating and thermal insulation treatment to obtain an acid-treated liquid, and performing separation, washing, and drying on the acid-treated liquid to obtain a yeast β-glucan product; and subjecting the yeast β-glucan to a combined action of a mixed enzyme preparation and ultrasound to obtain an enzymatic hydrolysate, and performing separation treatment on the enzymatic hydrolysate to obtain an insoluble yeast β-glucan and a water-soluble yeast β-glucan, respectively. In the present invention, a high-purity yeast β-glucan product having a content of 90% or more and a water-soluble yeast β-glucan product with biological activity can be prepared, the preparation method is simple, large-scale production can be achieved, and the quality and additional value of the product can be improved.

Apparatus and associated methods relate to evaluating impurity content in battery materials. In an illustrative example, a battery material impurity assessment system (BMIAS) may include a slurry mixing system and an impurity extraction system (IES). The slurry mixing system, for example, may include a motor configured to rotate a vertical axis of a slurry container. For example, the motor may pause a movement of the slurry container when the vertical axis is rotated at a predetermined angle. For example, the IES may include a translatable magnetic mass (TMM) enclosed within a sheath. For example, by operating a position of the TMM, the IES may release non-target impurity and retain target substances. In some implementations, the target substance may be ionized by an acid treatment solution rapidly without direct heating. In some implementations, the target substances may be dispersed on a conductive filter to be directly used in subsequent analysis. Various embodiments may advantageously rapid high precision and rapid impurity testing for battery manufacturing.

A treatment composition that includes a treatment adjunct and a population of core / shell delivery particles, where the shell is made from an acid-treated chitosan and a cross-linking agent, where the acid-treated chitosan results from treating chitosan with a weak acid, or even a mixture of a strong acid and a weak acid. Related methods of making and using such compositions.

The invention provides a positive electrode material, a preparation method thereof and a lithium ion battery, and belongs to the technical field of battery materials. Comprising the following steps: carrying out acid treatment on ferric oxide to obtain acid-modified ferric oxide; and mixing the acid-modified iron oxide, a second iron source, a lithium source and a phosphorus source to obtain a mixture, and then roasting the mixture to obtain the positive electrode material. By performing acid treatment on the ferric oxide, on one hand, impurities and a loose oxide layer on the surface of the ferric oxide can be removed, more active sites can be exposed, the reactivity of the ferric oxide is matched with that of the second iron source, the reaction process is carried out synergistically, and formation of a regular and uniform-size crystal structure is promoted; a foundation is laid for obtaining a positive electrode material with excellent electrochemical performance; on the other hand, the surfaces of the iron oxide particles can be regulated and controlled, so that agglomeration among the particles can be reduced when the iron oxide particles are mixed with the second iron source particles, the dispersity of the particles is improved, and the mixture forms more excellent gradation.

The invention relates to the technical field of distillate oil refining, and discloses a vacuum distillate oil deacidification method which comprises the following steps: S10, performing deacidification treatment on vacuum distillate oil and a deacidification agent in a deacidification unit; s20, carrying out extraction separation on the obtained deacidification agent to be generated and a back extraction agent in a back extraction mixing coalescer; s30, the separated supernatant liquid is conveyed to a back extractant regeneration device for regeneration treatment; s40, the separated lower-layer liquid enters a deacidification agent regeneration device to be subjected to regeneration treatment; the deacidification unit comprises one or more deacidification mixing coalescers, each of the deacidification mixing coalescers and the back extraction mixing coalescers comprises a shell, each shell is provided with a premixing area, a coalescence separation area and a settling separation area from top to bottom, structured packing is arranged in the premixing areas, and polar fiber bundles are arranged in the coalescence separation areas; the deacidification agent contains organic amine, a cosolvent and water. The method can be used for deacidification treatment of vacuum distillate oil with high viscosity and high acid value, and is wide in application range.

The invention relates to the technical field of stainless steel pipe fittings, in particular to a high-performance anti-corrosion stainless steel pipe fitting and a preparation method thereof.The preparation method of the high-performance anti-corrosion stainless steel pipe fitting comprises the following steps that S1, mechanical polishing is conducted; s2, removing oil; s3, acid treatment is conducted, specifically, the stainless steel pipe fitting blank obtained after oil removal is soaked in an acid surfactant solution for 5-10 min, and the stainless steel pipe fitting blank is taken out, washed with water and dried; the solute in the acidic surfactant solution comprises acid and a cationic surfactant; s4, adsorption treatment is conducted, specifically, the stainless steel pipe obtained after acid treatment is soaked in an adsorption solution containing graphene oxide for 4-10 min, and the stainless steel pipe is taken out and dried; and S5, anti-corrosion coating treatment is conducted, specifically, anti-corrosion coating is sprayed to the surface of the stainless steel pipe fitting blank, drying is conducted, and the high-performance anti-corrosion stainless steel pipe fitting is obtained. The method has the advantage that the anti-corrosion performance of the organic anti-corrosion coating can be improved.

The invention discloses an electrode material for purifying and disinfecting drinking water as well as preparation and application thereof, and belongs to the technical field of drinking water purification. An Ag nano structure and an Au nano structure are sequentially constructed on a plastic base material, the electrode material is endowed with excellent antibacterial and catalytic performance, the Ag nano structure is formed through acid treatment and precursor solution soaking, and the preliminary antibacterial performance is endowed; the antibacterial effect is enhanced by micro-emulsion soaking; the microemulsion A and the solution B are mixed to prepare a spraying solution, a stable Au nanostructure is formed after spraying, an electrochemical oxygen reduction reaction is promoted, the H2O2 generation efficiency is improved, hydroxyethyl ethylenediamine triacetic acid and acrylamide are used in cooperation, the Au dosage and the complexing temperature are adjusted, a microcosmic honeycomb structure is formed, and the H2O2 concentration is remarkably improved. The electrode material has antibacterial performance, also has excellent conductivity and catalytic activity, is stable in purification effect before and after use, can be repeatedly used, and has wide application prospects in the fields of drinking water purification and the like.

The invention relates to the technical field of carbon nanotubes, and particularly discloses a purification method of a carbon nanotube. The purification method of the carbon nano tube comprises the following steps: (1) weighing a carbon nano tube crude product and various raw materials, (2) adding the carbon nano tube crude product and a surfactant into deionized water, and carrying out ultrasonic dispersion to obtain a dispersion liquid, (3) carrying out gradient centrifugation on the dispersion liquid, and taking an upper-layer suspension liquid, and (4) mixing hydrochloric acid, nitric acid and the suspension liquid, and treating the carbon nano tube to obtain the carbon nano tube. (5) treating the carbon nano tube by dilute acid, mildly oxidizing the carbon nano tube by using a low-concentration hydrogen peroxide solution, and then placing the carbon nano tube in a magnetic field to adsorb magnetic impurities, (6) carrying out cross-flow filtration by using a polycarbonate microfiltration membrane and collecting the treated carbon nano tube, and (7) annealing the treated carbon nano tube by using inert gas and freeze-drying to obtain the purified carbon nano tube. According to the purification method, the metal catalyst, amorphous carbon and graphite impurities can be efficiently removed, and meanwhile, the integrity of the tube wall of the carbon nano tube is kept.

A bimetal active site doped carbon-based catalyst, which is particularly a ZnMn-N-C catalyst. The ZnMn-N-C catalyst is prepared by using 1H-1,2,3-triazole, manganous nitrate and zinc chloride as reaction raw materials, subjecting same to a solvothermal reaction and then to drying to obtain a Mn-MET-ZnCl2 powder, and then sequentially subjecting the powder to primary pyrolysis, a sulfuric acid treatment and secondary pyrolysis. By respectively using 1H-1,2,3-triazole and zinc chloride as a mesopore forming agent and a micropore forming agent, and adjusting the pore-forming sequence and controlling the pore-forming process by means of pyrolysis, a large number of mesopores are preferentially formed, and then a large number of micropores are uniformly distributed in the mesopores, thereby forming a hierarchical pore channel structure and overcoming the problem of the collapse of the pore channel structure during the formation of the structure; and the obtained bimetal site doped carbon-based catalyst ZnMn-N-C has a high specific surface area of 1837.9 m2 / g and exhibits a good ORR activity (E1 / 2=0.867 V vs. RHE), and a primary zinc-air battery assembled by using the catalyst ZnMn-N-C as a positive oxygen reduction catalyst has a high energy density of 889 Wh / kg-1 Zn.

The invention provides a formed foil and a preparation method thereof. The preparation method of the formed foil comprises the following steps: carrying out pretreatment on an aluminum foil, namely carrying out at least one high-temperature treatment and acid treatment on the aluminum foil; and carrying out multi-stage formation treatment on the pretreated aluminum foil. According to the invention, the hydration resistance of the formed foil can be improved, and the reliability and stability of the aluminum electrolytic capacitor can be improved.

The invention discloses an environment-friendly automobile decoration material containing a bio-based material and a preparation method of the environment-friendly automobile decoration material, belongs to the technical field of preparation of environment-friendly materials, and aims at solving the technical problem that the environment-friendly performance and flame-retardant performance of a decoration material in the prior art need to be further improved. The flame-retardant polyurethane material specifically comprises the following components in parts by weight: 40-60 parts of mixed polyol, 15-25 parts of flame-retardant cellulose, 35-45 parts of isocyanate and 10-15 parts of an auxiliary additive. According to the preparation method, biomass-containing mixed polyol is prepared through esterification reaction, modified cellulose is prepared through acid treatment, alkali treatment and esterification reaction, the modified cellulose is combined with the modified cellulose through covalent bonds, flame-retardant cellulose is obtained, the environment-friendly performance and flame-retardant performance of the decorative material are improved, and the mechanical strength of the decorative material is also improved.

Disclosed are sulfated cellulose nanofibrils, methods of making sulfated cellulose nanofibrils, and methods of spinning the sulfated cellulose nanofibrils into high-strength fibers. The sulfated cellulose nanofibrils may be formed using a chlorosulfonic acid treatment.

The invention discloses a method for modifying a nano-cluster Y molecular sieve, which comprises the following steps of: (a) controlling the sodium oxide content of the nano-cluster Y molecular sieve to be 2.0-4.5% through ion exchange treatment; (b) adopting an ammonium fluosilicate solution to carry out shallow dealumination and silicon supplementation on the nano-cluster Y molecular sieve obtained in the step (a), wherein the shallow dealumination and silicon supplementation means that the silica-alumina ratio of the nano-cluster Y molecular sieve after dealumination and silicon supplementation is controlled to be increased by 50-200% compared with that of the nano-cluster Y molecular sieve before treatment, and preferably, the silica-alumina ratio of the nano-cluster Y molecular sieve after dealumination and silicon supplementation is increased by 80-150%; (c) carrying out hydrothermal dealumination treatment on the material obtained in the step (b); and (d) carrying out acid treatment on the material subjected to hydro-thermal treatment to obtain the modified nano-cluster Y molecular sieve. Compared with a nano-cluster Y molecular sieve before treatment, the modified Y molecular sieve prepared by adopting the modification method not only keeps the nano-cluster shape, but also greatly improves the mesoporous content and the hydrothermal stability.

A method for preparing a transition metal electrochemical catalyst according to an embodiment of the present disclosure includes dissolving a nitrogen precursor and a transition metal precursor in a polyol-based solvent so as to prepare a solution in which transition metal ions and free anions are coordinated, and mixing same with a support so as to prepare a mixture, igniting the mixture so as to carbonize the polyol-based solvent, thereby forming transition metal nanoparticles encompassed by carbon, performing heat treatment in order to carbonize remaining organic matter contained in the mixture, and removing, through acid treatment, impurities and transition metal nanoparticles not encompassed by carbon, and then removing remaining acid through washing and additional heat treatment, thereby a nanocatalyst having a structure in which a single-atom transition metal-nitrogen bonding structure and / or transition metal nanoparticles encompassed by carbon exist is synthesized.

The invention relates to a polishing method of a semiconductor material, in particular to a chemical mechanical polishing method of an InP (Indium Phosphate) substrate, and aims to solve the problems of complex polishing solution formula, high cost, poor suitability of process parameters and InP materials and high surface defect rate in the conventional polishing method. The method comprises the steps of (1) preparing a polishing solution, (2) preparing a circular InP substrate, (3) setting technological parameters and polishing the circular InP substrate, and (4) carrying out acid treatment.The method has the advantages that the polishing solution is simple in formula and low in cost, the surface roughness Ra after polishing is extremely small, defects are few, the technological stability is good, and the method is suitable for industrial production.

The invention discloses a biochar-based microbial soil conditioner and a preparation method thereof, and relates to the technical field of soil improvement. The preparation method comprises the following steps: firstly, carrying out alkali-acid treatment and segmented pyrolysis on raw materials such as wood chips to obtain primary biochar, and then carrying out chemical activation, nano material modification and plasma treatment to obtain the composite modified biochar. Meanwhile, probiotics such as bacillus subtilis and the like are subjected to activation, expanding culture and saline-alkali domestication to obtain directional domestication bacterial liquid, and the directional domestication bacterial liquid is solidified into microspheres by adopting a composite embedding carrier. And finally, mixing the composite modified biochar, the composite embedded microspheres, potassium humate and other auxiliary materials, drying, and sieving to obtain the soil conditioner. The soil conditioner disclosed by the invention can realize an improvement effect on saline-alkali soil and reduce the total salt content; meanwhile, directionally domesticated microorganisms secrete organic acid to neutralize alkaline components, the pH of the soil is adjusted to the range suitable for crop growth, and salt and alkali stress is relieved.

The invention discloses a preparation method of a cation selective separation membrane for ion separation, which comprises the following steps: selecting a PNA polymer with pi-pi interaction, hydrogen bond and microporous network structure as a precursor of a membrane material, and introducing a sulfonated side chain into a membrane matrix to construct an efficient ion exchange site; and by introducing an alkoxy chain to promote high-efficiency transmission of the monovalent cations, a dense network structure is formed through ultraviolet crosslinking after the homogeneous membrane liquid is coated and dried, and the transmission channel of the monovalent cations is further optimized. The efficient and convenient one-pot ternary polymerization technology is adopted, the synthesis steps of the membrane material are simplified, the production efficiency is improved, the uniformity of the product is ensured, the prepared separation membrane shows high ion flux and ion selectivity in electrodialysis application, and the separation membrane can be applied to electrodialysis. The method has huge application potential and market prospect in the industrial fields of salt lake lithium extraction, chlor-alkali industry, waste acid treatment and the like.

The invention relates to the field of C01B17 / 69, in particular to a dilute sulphuric acid concentration and desalination technology for dye production, waste sulphuric acid generated in the vat dye production process is automatically and efficiently treated by designing three-stage evaporation concentration, freezing crystallization and centrifuge desalination technologies, the waste sulphuric acid is concentrated to the concentration of 93-95%, resource recycling is achieved, and the cost is reduced. Meanwhile, inorganic salt in the waste sulfuric acid is fully separated, so that the regenerated sulfuric acid obtained after treatment meets actual use standards and requirements; the energy consumption is low, the efficiency is high, the operation treatment capacity is large, the waste acid treatment capacity reaches up to 27000 tons per year, and huge market application potential is embodied; the method is simple in process, high in operation automation control level, safe, stable and stable in operation, large-scale continuous production can be realized, and an efficient, safe, economical, continuous and reliable treatment method is provided for treatment of waste acid generated in the vat dye production process.