826 results about "Sulfate radicals" patented technology

The invention discloses a cementing material for a solid waste-based road of a coal-fired power plant and a preparation method of the cementing material. The cementing material mainly comprises a cementing component, an alkali-activated component and a reinforcing component, the gelling component is a mixture of coal-fired power plant fly ash and furnace slag; the alkali-activated component is a mixture of alkali residues, red mud, blast furnace slag and coal-fired power plant desulfurized gypsum; the reinforcing component is rice hull ash or peanut hull ash. The mass ratio of the gelling component to the alkali-activated component is (4 / 1)-(10 / 1); and the addition amount of the reinforcing component is 1-3% of that of the main body material. The coal-fired power plant solid waste fly ash, the furnace slag and the desulfurized gypsum are used as main bodies, a small amount of other industrial solid waste is added, and the cementing material belongs to a full-solid-waste low-carbon cementing material and can be applied to a road base, a subbase or a base layer. The invention has the characteristics of low carbon emission, high solid waste consumption, simple production process and strong pavement performance, and in addition, the invention has a good stabilization effect on the problem that part of solid waste heavy metals and sulfate ions in a coal-fired power plant exceed the standard.

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention provides a method, a device and equipment for predicting corrosion current and corrosion of steel bars in concrete in a low-pressure environment, and belongs to the technical field of engineering simulation modeling. The method comprises the following steps: establishing a coupling transmission model in concrete considering oxygen concentration, sulfate ion diffusion behavior and chloride ion diffusion behavior; building a reinforcement corrosion current density and corrosion depth prediction model for predicting the number of charges at different positions of the reinforcement in the concrete, and calculating the corrosion depth and the corrosion product content based on the corrosion current density; and establishing a linear elastic damage model for simulating concrete damage evolution caused by steel bar corrosion according to the corrosion product content output by the steel bar corrosion current density prediction model so as to realize accurate prediction of corrosion and damage. According to the method, oxygen concentration changes under low air pressure are considered, oxygen diffusion is described, output of a transmission model serves as a dynamic variable to be introduced into the corrosion current calculation process, and the accuracy of corrosion current and steel bar corrosion prediction is improved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a composite material as well as a preparation method and application thereof. According to the composite material, blended hydrogel of sodium alginate and polyvinyl alcohol is used as a matrix, zeolite molecular sieves, activated charcoal and zero-valent iron particles are embedded into the matrix to form microspheres, sulfate reducing bacteria are immobilized on the surfaces of the microspheres, the composite material is directly added into a mine water anaerobic reactor, the sulfate radical removal rate exceeds 92%, and the sulfate radical removal rate exceeds 92%. Heavy metals such as Cu, Pb and Cr in the mine water can be synchronously precipitated, and the treatment efficiency and stability of the anaerobic system are remarkably improved.

The invention provides an efficient chloramphenicol degradation method based on Co-Cu-carbon composite nano-catalyst activated peroxymonosulfate, which comprises the following steps: regulating the Co / Cu molar ratio in a bimetal organic framework precursor, and performing pyrolysis to prepare the Co-Cu-carbon composite catalyst with an optimized pore structure, graphitization degree and metal dispersity; peroxymonosulfate is activated by utilizing the synergistic effect of Co / Co and Cu / Cu redox pairs to generate sulfate free radicals, hydroxyl free radicals, singlet oxygen and superoxide free radicals, and direct oxidative degradation of chloramphenicol is promoted by taking a catalyst as an electron transfer bridge; the method realizes rapid and efficient removal of chloramphenicol, high mineralization rate, excellent cycle stability and strong anti-interference capability, and solves the technical problems of low removal efficiency, high cost and easy secondary pollution in the prior art.

The invention belongs to the technical field of inter-cooling water treatment, and relates to a system and method for cooperatively treating inter-cooling water through multi-stage bypasses. Comprising a gradient filtering unit, a modified adsorption unit and a composite adsorption unit which are sequentially connected, a bottom outlet of the gradient filtering unit is connected with a bottom inlet of the modified adsorption unit; a top outlet of the modified adsorption unit is connected with a top inlet of the composite adsorption unit; the gradient filtering unit sequentially comprises a manganese sand layer and a quartz sand layer from top to bottom; the modified adsorption unit is filled with a coal gangue modified straw biochar material; the composite adsorption unit is internally filled with a microcapsule-embedded calcium alginate-vinasse biochar composite material. According to the invention, three-stage cooperative treatment of iron suspended matter interception, sulfate radical adsorption and iron ion chelation is realized, and low-cost, green and sustainable indirect cooling water deep purification is realized by using the solid waste-based functional material.

The invention provides a method and system for recovering phosphate radicals, fluorine ions and sulfate radicals from phosphogypsum washing water step by step, and belongs to the technical field of industrial wastewater resourceful treatment. The method comprises the following steps: (1) adjusting the pH value of the wastewater to 3.0 + / -0.5, adding ferric sulfate according to the molar ratio of Fe to PO4 < 3-> of (1.0-1.5): 1, and selectively precipitating phosphate radicals to generate iron phosphate with the purity of more than or equal to 97%; (2) adjusting the pH value of the first filtrate to 4.7 + / -0.5, adding calcium fluoride seed crystals with the particle size of 50-200mm and CaCl2 (the molar ratio of Ca to F <-> is 0.5: 1-0.6: 1), and carrying out induced crystallization to recover calcium fluoride with the purity of more than or equal to 96%; and (3) adding Ca (OH) 2 (Ca: SO4 < 2-> molar ratio of 1.0: 1-1.2: 1) into the second filtrate, and directionally precipitating sulfate radicals to generate calcium sulfate dihydrate with the purity of more than or equal to 98%. According to the method, the pH and the precipitation sequence are controlled step by step, so that the problem of polyanion competition is solved, the recovery rates of phosphate radical, fluorine ion and sulfate radical respectively reach 98.8%, 96.3% and 97.5%, the content of PO4 < 3-> in purified water is less than or equal to 10 mg.L <-1 >, the content of F <-1 > is less than or equal to 5 mg.L <-1 >, and the content of SO4 < 2-> in purified water is less than or equal to 100 mg.L <-1 >, and the purified water can be directly recycled.

The invention discloses modified biogas residue-based hydrothermal carbon, a preparation method thereof and a dry digestion method for kitchen waste, and belongs to the technical field of waste organic matter recycling. The preparation method comprises the following steps: soaking biogas residues in a phosphoric acid solution to obtain pretreated biogas residues; mixing the pretreated biogas residues, transition metal salt, biochar loaded with vitamin B12 and water with the mass being 8-15 times that of the pretreated biogas residues, and performing hydrothermal reaction for 1-4 hours under the conditions that the temperature is 180-250 DEG C and the pressure is 1.5-4 MPa to obtain a hydrothermal product; and activating the hydrothermal product for 1-2 hours under the protective atmosphere of 300-400 DEG C to obtain the modified biogas residue-based hydrothermal carbon. The surface Fe-Cu composite oxide sequentially catalyzes and oxidizes H2S into elemental sulfur and sulfate ions, the vitamin B12-loaded biochar can promote MA directional proliferation, the sulfate ions can competitively inhibit SRB substrate uptake, the quantity ratio of MA to SRB is increased, and the methane production efficiency is effectively improved.

The invention provides a method for extracting lithium from sulfate subtype salt lake original brine and application, and belongs to the field of salt lake lithium extraction.The method for extracting lithium from sulfate subtype salt lake original brine comprises the following steps that the sulfate subtype salt lake original brine is subjected to pretreatment and nanofiltration treatment, and low-sulfate-radical brine and high-sulfate-radical brine are obtained; the low-sulfate-radical brine is subjected to desorption after being treated by an aluminum-series lithium adsorbent, and a first desorption solution is obtained; the high-sulfate-radical brine is desorbed after being treated by a titanium-series lithium adsorbent, and a second desorption solution is obtained; the first desorption solution and the second desorption solution are sequentially subjected to RO membrane concentration, multi-stage nanofiltration, electrodialysis concentration, evaporation concentration, resin impurity removal and lithium precipitation treatment, and the battery-grade lithium carbonate is obtained. The nanofiltration treatment is small in operation pressure and low in energy consumption; and the obtained low-sulfate-radical brine and high-sulfate-radical brine are respectively treated by adopting proper adsorbents according to different sulfate radical concentrations so as to efficiently recover lithium, so that the lithium yield is improved, the operation is simple, and the obtained battery-grade lithium carbonate is high in purity and excellent in performance.

The invention discloses wear-corrosion-resistant high-strength steel for a power transmission tower and a preparation method thereof, and belongs to the technical field of metal materials. The wear-corrosion-resistant high-strength steel for the power transmission tower provided by the invention has good corrosion resistance and wear resistance, has excellent wear resistance in a soil environment of sulfate ions with the concentration of 300 mg / kg-50000 mg / kg and chloride ions with the concentration of 500 mg / kg-10000 mg / kg, and meets various environmental performance requirements of an acid soil environment, an atmospheric corrosion environment and the like. In an acid soil environment, the corrosion resistance is more than 8 times that of plain carbon steel, and the relative corrosion rate is lower than 10%; compared with Q355B, the corrosion rate of atmospheric corrosion resistance is lower than 40%, and the abrasive wear rate is 26.5%-28.0%; and through reasonable matching of corrosion-resistant elements, the requirements of corrosion resistance in various environments are met. The yield strength is 775 MPa-805 MPa, the tensile strength is 952 MPa-985 MPa, the percentage elongation after fracture A50 is larger than or equal to 28%, the low-temperature impact toughness at the temperature of-60 DEG C is larger than or equal to 260 J, meanwhile, the forming performance is excellent, and the 180-degree cold bending requirements that d is equal to 1.0 a are met.

The invention discloses a method for preparing low-sulfate basic nickel carbonate, and belongs to the technical field of chemical engineering, a three-stage grading washing process is designed through precipitant selection and grading washing processes, each stage of washing has specific purposes and conditions, and particularly, ammonium sulfate and residual sulfate radicals are subjected to competitive reaction in secondary washing, so that the low-sulfate basic nickel carbonate is prepared. The method effectively solves the problem of high sulfate radical content of basic nickel carbonate in the prior art, improves the purity and performance of the product, and has the advantages of simple operation, low cost and the like. The process method has good application prospects and market value and is expected to be widely applied to the field of chemical material preparation.

The invention provides a BDO (1, 4-butanediol) wastewater treatment process with high sulfate content, which comprises the following steps: carrying out electrochemical oxidation treatment on BDO (1, 4-butanediol) wastewater with high sulfate content; introducing the obtained BDO wastewater into an anaerobic reaction device for anaerobic reaction to reduce sulfate ions into hydrogen sulfide and oxidize organic matters to reduce COD (Chemical Oxygen Demand); effluent sequentially flows back to the circulating desulfurization device and the air floatation device; carrying out aeration treatment in the circulating desulfurization device so as to oxidize hydrogen sulfide into elemental sulfur; elemental sulfur is recycled in the air flotation device, and part of effluent of the air flotation device and part of effluent of the anaerobic reaction device flow back to inlet water of the anaerobic reaction device; part of effluent of the air floatation device and part of effluent of the anaerobic reaction device are combined and then are sequentially introduced into an aerobic activated sludge tank with a membrane bioreactor and an ozone catalytic oxidation tank. Effluent can enter a subsequent ultrafiltration reverse osmosis membrane system to be purified, and water produced by the membrane system is recycled as reclaimed water.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a supported electrolyte of all-vanadium redox flow battery positive and negative electrolyte and a preparation method thereof, and the supported electrolyte comprises an aqueous solution containing vanadium ions, sulfonate ions, sulfate ions and phosphonic acid groups. The sulfonic acid group (-SO3H) has strong polarity and high ionization degree, after the sulfonic acid group (-SO3H) is mixed with the phosphonic acid group (-PO3H2) and sulfuric acid, the ionic environment of the electrolyte can be optimized, the activation energy of V (II) / V (III) and V (IV) / V (V) electricity on electron transfer is reduced, and compared with an existing sulfuric acid supported electrolyte, the reversibility of electrochemical reaction is remarkably improved, and the electrochemical activity of the electrolyte is enhanced; meanwhile, phosphonic acid groups have high complexing ability, can form stable chelates with vanadium ions and can form complexing-dispersing synergy with sulfonic acid groups, the solubility of the vanadium ions is improved, and agglomeration and crystallization of the vanadium ions are inhibited.

The invention discloses a method for oxidation treatment of winery wastewater, and belongs to the technical field of environmental protection. The winery wastewater treatment method comprises the following steps: mixing winery wastewater and persulfate to form a reaction solution, and then carrying out ultrasonic cavitation treatment on the reaction solution to generate hydroxyl free radicals and persulfate free radicals. The treatment method disclosed by the invention has the advantages of simple process, high safety and low cost, and shows a good application prospect in the environmental protection fields such as winery wastewater treatment and similar wastewater treatment.

A method for preparing 1,2-propanediol involves continuously reacting propene with hydrogen peroxide in the presence of a catalyst mixture, containing a quaternary ammonium salt and a polytungstophosphate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase containing an alkylaromatic hydrocarbon solvent. The method then involves withdrawing the liquid reaction mixture from the reaction and adding a water-soluble sulfate salt or sulfuric acid to provide a mixture containing from 500 to 10,000 mg / kg of sulfate ions in the aqueous phase. The method further involves separating the mixture obtained into an aqueous phase (Pa) containing 1,2-propanediol and an organic phase (Po), recycling at least a part of the organic phase (Po) to the reaction, and recovering 1,2-propanediol from the aqueous phase (Pa). The method allows for extended operation of the reaction with little loss of tungsten and phase transfer catalyst.

The invention relates to a recycling method of chemical polishing waste liquid, which comprises the following steps: (1) carrying out first pH regulation treatment on the chemical polishing waste liquid containing phosphate radicals, sulfate radicals, aluminum ions and + 3 valent iron ions to obtain aluminum mud and aluminum-removed liquid; (2) sequentially carrying out second pH regulation treatment, third pH regulation treatment and dealumination treatment on the aluminum mud to obtain a hydrated calcium aluminate product; (3) the aluminum-removed liquid is subjected to phosphorus removal treatment, and first phosphorus mud and phosphorus-removed liquid are obtained; sequentially carrying out fourth pH regulation treatment and first evaporative crystallization treatment on the first phosphorus sludge to obtain a sodium phosphate product; and sequentially carrying out fifth pH regulation treatment and second evaporative crystallization treatment on the dephosphorized liquid to obtain a sodium sulfate product. According to the method disclosed by the invention, phosphorus, sulfur and aluminum in the chemical polishing waste liquid are completely separated by utilizing different solubility of different substances in the solution when the pH value is the same, and a sodium phosphate product, a sodium sulfate product and a hydrated calcium aluminate product are respectively obtained, so that complete recycling of elements in the chemical polishing waste liquid is realized, and no byproduct waste is produced.

The invention provides a preparation method of ultrahigh-purity copper. The preparation method comprises the following steps: providing a first anode, a first cathode and an electrolyte; the electrolyte comprises the following components: a purified copper salt solution, inorganic acid, an oxidizing agent and an additive, the purified copper salt solution comprises purified copper salt and water, the purified copper salt comprises copper sulfate and copper nitrate, and the molar ratio of nitrate to sulfate in the purified copper salt solution is (1.5-9): 1; the additive comprises any one or a combination of at least two of an alcohol compound, polyacrylamide or a tetrazole compound; and the first cathode and the first anode are immersed in the electrolyte for electrochemical deposition, and the ultra-high-purity copper is obtained. The electrolyte composed of the purified copper salt solution, the inorganic acid, the oxidizing agent and the additive is adopted, the proportion of nitrate radicals to sulfate radicals in the purified copper salt solution is controlled, the impurity content of the sulfur element and the silver element in the electrolyte can be controlled, and preparation of the ultra-pure electrolytic copper is achieved.

A reformate hydrodeolefin catalyst comprising a sulfato-containing alumina carrier and an active component comprising Pd 0.22-0.40 mass%, Pt 0.07-0.18 mass%, chlorine 0.4-3.0 mass%, and the sulfato content in the sulfato-containing alumina carrier is 0.3-3.0 mass% based on alumina. The catalyst can effectively remove olefins in reformate with bromine index higher than 4000 mgBr / 100g oil, and no pre-sulfurization is needed before use. The deolefin product with bromine index less than 50 mgBr / 100g oil and aromatic loss less than 0.5 mass% can be obtained.

The invention discloses a soft soil curing agent as well as a preparation method and application thereof, and belongs to the technical field of soil curing agents. According to the cement-based curing agent, the mineral powder, the steel slag, the red mud and other industrial solid wastes serve as core components, the total solid waste proportion reaches 90% or above, the solid waste resource utilization rate is increased by two times or above compared with a traditional cement-based curing agent, an alkaline synergistic effect is formed among the solid wastes, the leaching risk of heavy metal in the red mud is avoided, and the solid waste recycling rate is remarkably increased. The ion concentration response type modified microbead provided by the invention adopts the SAP-based soluble coating design, and the coating dissolution degree is in negative correlation with the water content of soft soil, namely the lower the ion concentration is, the higher the dissolution degree is, and the on-demand release of hydroxyl (OH-) and sulfate radical (SO42-) is realized; the higher the water content of the soil body is, the lower the ion concentration is, the higher the corrosion degree of the ion concentration response type modified microbead coating is, the higher the OH <-> and SO4 < 2-> release rate is, and intelligent excitation efficacy breakthrough of the soft soil curing agent is achieved.

The invention relates to a lanthanide oxide electrochemiluminescence aptamer sensor with dual signal amplification for detecting acetamiprid as well as a preparation method and application of the lanthanide oxide electrochemiluminescence aptamer sensor. According to the sensor, terbium-doped europium oxide (Eu2O3: Tb < 3 + >) modified by gold nanoparticles (Au NPs) is used as a luminous body, and the electrochemical luminescence performance can be remarkably improved through multiple mechanisms: on one hand, the Au NPs can effectively promote generation of more sulfate free radicals; on the other hand, the surface defect passivation effect and the efficient synergistic effect of energy transfer jointly achieve effective amplification of signals. In addition, the wool ball-shaped Ag NPs is used as a plasma resonance signal amplification source, so that the ECL intensity of the sensor is further enhanced. The prepared electrochemical luminescence sensor with the dual signal amplification effect is used for detecting acetamiprid (ACE), has a wide linear range and a low detection limit, and has a wide application prospect in detection of acetamiprid residues in a water environment.

The invention discloses an iron-cobalt spinel oxide, which is prepared by the following steps: with ferric salt and cobalt salt as raw materials, dissolving the ferric salt, the cobalt salt and sodium acetate in an ethanol aqueous solution to obtain a precursor solution, carrying out hydrothermal treatment on the precursor solution, and washing and drying a reaction product to obtain the iron-cobalt spinel oxide. The iron-cobalt spinel type oxide is stable in crystal structure, the leaching rate of metal ions is remarkably reduced due to existence of metal-oxygen bonds, the recycling rate is increased, and meanwhile the risk of secondary pollution of water is reduced. In the process of degrading nitrogen-containing organic wastewater by an advanced oxidation technology for generating sulfate free radicals based on peroxymonosulfate, the iron-cobalt spinel type oxide has good catalytic performance, and can basically complete degradation of multi-nitrogen organic pollutants in water; and the method has relatively strong capability of resisting interference of inorganic ions and organic matters, and has relatively great application potential in actual wastewater treatment. The invention also discloses a method for degrading the multi-nitrogen explosive wastewater by using the ferrocobalt spinel type oxide.

The present application discloses a method and device for determining the reaction intensity of TSR in a reservoir, which belongs to the technical field of oil and gas reservoirs. The method comprises: obtaining sulfate ions SO4 in the formation water of the target reservoir; 2‑ The concentration of chloride ions Cl ‑ Calculate the concentration of SO4 in the formation water of the target reservoir 2‑ The concentration value and Cl ‑ The ratio of the concentration values ​​of SO4 in the formation water of the target reservoir; 2‑ The concentration value and Cl ‑ The reaction intensity of the thermochemical sulfate reduction reaction TSR in the target reservoir is determined by the ratio of the concentration values ​​of . The present application can more accurately determine the reaction intensity of the TSR in the reservoir.

The invention discloses a preparation method and application of a ferromanganese phosphate hydrate based on sulfate free radicals, and provides the preparation method and application of the ferromanganese phosphate hydrate based on the sulfate free radicals in order to solve the technical problems existing in preparation of the ferromanganese phosphate hydrate (Mn1-xFexPO4.H2O) in an aqueous solution system in the prior art. The invention innovatively provides a technology for preparing a precursor ferromanganese phosphate hydrate of a lithium ion battery positive electrode material based on a three-step synergistic strategy of oxidation, locking and release of sulfate free radicals, and the sulfate free radicals (SO4 <.->) with strong oxidizability are generated in situ through thermal activation of persulfate; the high-quality ferromanganese phosphate hydrate Mn1-xFexPO4.H2O (01t, 01t) which is pure in phase, uniform in composition and controllable in structure is accurately prepared by combining subsequent formation and'locking 'of an intermediate-state complex and final regulation and control'release' and homogeneous precipitation steps; and x < = 0.5). The Mn < 1-x > FexPO4.H2O (0 lt; x is greater than or equal to 1 and less than or equal to 0.5) is used as a precursor for preparing a lithium battery positive electrode material, and the prepared LiMn1-xFexPO4 / C positive electrode material shows excellent electrochemical performance.

The invention discloses a device and a method for synchronously removing heavy metals and organic matters in industrial wastewater, and particularly relates to the technical field of water treatment.A complexing agent is used for promoting manganese dioxide on the surface of manganese sand to activate peroxymonosulfate to generate high-activity sulfate free radicals and persulfate free radicals, so that the oxidative degradation efficiency of organic pollutants is improved; meanwhile, residual manganese dioxide formed in the reaction process has good heavy metal adsorption performance, and the mass transfer and reaction rate of pollutants is enhanced by combining the dynamic fluidized contact effect of manganese sand particles in the fluidized bed reactor. According to the process provided by the invention, various organic pollutants and heavy metal ions in the wastewater can be synchronously and efficiently removed under a mild condition, the problems of low treatment efficiency, complex process flow, secondary pollution and the like in a traditional method are avoided, and the process has a good application prospect and popularization value; the technical challenges of complex components and high treatment difficulty of industrial wastewater can be effectively handled.

The invention discloses a device and a method for testing degradation and dissolution quantity of ion exchange resin, and relates to the field of performance testing of ion exchange resin. An inlet of a peristaltic pump is communicated with a liquid outlet of a liquid inlet box, an outlet of the peristaltic pump is communicated with an inlet of a temperature control heater, the upper end of an exchange column is communicated with an outlet of the temperature control heater, and the lower end of the exchange column is connected with a liquid storage box; the liquid storage tank is connected with the second gas collector, and the nitrogen cylinder gas conveying pipe penetrates into the liquid storage tank. Water washing or pretreatment is completed before testing, then heating temperature is set according to operation conditions, demineralized water or treating fluid is introduced into an exchange column, when gas-phase degradation products need to be collected, the gas-phase degradation products are collected through a first gas collector and a second gas collector, and if the sample is anion exchange resin, high-purity nitrogen is introduced into a liquid storage tank through a nitrogen cylinder, and the sample is collected through a second gas collector. The volatile organic matter is purged into a second gas collector, and finally the degradation and dissolution amount of the ion exchange resin is calculated according to TOC or chemical oxygen demand, the concentration of methanol and trimethylamine and the content of sulfate radicals or ammonia nitrogen.

The invention relates to the technical field of negative electrode materials, in particular to a zinc negative electrode containing layered double hydroxides and a preparation method of the zinc negative electrode. The zinc negative electrode material containing the layered double hydroxides has excellent cycle stability (the cycle life is longer than 1400 h) and high capacity retention ratio (larger than 85%), and meanwhile shows good rate capability, and the preparation method comprises the steps that magnesium salt and aluminum salt are subjected to a hydrothermal reaction under the alkaline condition to prepare precursor powder; then carrying out intercalation treatment through a magnesium sulfate solution and a composite intercalation auxiliary agent to obtain sulfate radical intercalation LDH; and mixing the modified zinc oxide with conductive carbon black and polyvinylidene fluoride, performing ball milling to obtain slurry, coating the surface of zinc foil with the slurry, and performing drying and cold pressing to obtain the modified zinc negative electrode. Through the synergistic effect of the composite intercalation auxiliary agent, the dispersity of the LDH nanosheets in the slurry is remarkably improved, a uniform and stable coating structure is formed, and zinc dendrite growth and interface side reaction are effectively inhibited.

The invention discloses a treating agent for organic pollutants in sewage as well as a preparation method and application of the treating agent in the technical field of sewage treatment, and adopts a phosphorus / B introduction dual strategy to realize accurate control of doping positions and proportions of P and B elements on a molecular level; according to the present invention, the synergistic enhancement effect of the catalyst on the aspects of active sites, charge transfer and free radical generation ability is improved, the precursor structure is induced to generate the porous structure during the pyrolysis process, and the specific surface area of the catalyst and the diffusion mass transfer of the reactant can be easily enhanced, and the prepared treatment agent can be used in the PMS system advanced oxidation technology industrial sewage treatment method, according to the treatment method, potassium hydrogen persulfate and a specific treatment agent are synergistically used, the generation efficiency of sulfate free radicals and hydroxyl free radicals in a PMS activation system is remarkably improved, efficient recovery of the heterogeneous catalyst is achieved in a multivalent metal ion bridging mode, the loss rate of the catalyst is reduced, and the utilization rate of the catalyst is increased. And secondary pollution of the catalyst to the effluent is also avoided.

The invention provides a saline-alkali soil improver with a high-activity surface and application, and belongs to the technical field of saline-alkali soil improvement. Under the ultrasonic condition, a sulfur source is pre-loaded into biomass, under the action of sulfate free radicals, the surface of hydrothermal carbon is etched in the hydrothermal reaction process, the specific surface area and porosity are increased, and meanwhile, part of fractured C-C bonds provide active sites for sulfur doping; meanwhile, alginate and Fe < 3 + > are cross-linked to form a hydrogel network, hydrothermal carbon is wrapped, sulfur stability is enhanced, direct contact between the material and soil is reduced, functional groups of the material are protected, efficient ion exchange in the membrane is achieved, and meanwhile the action duration of the material is prolonged. Through a triple mechanism of'exchange desalination-soil agglomeration-nutrient synergism ', physical, chemical and biological characteristics of the saline-alkali soil can be improved, crop growth is promoted, the content of heavy metals in the soil is reduced, carbon immobilization is enhanced, the bioavailability and toxicity of pollutants are reduced, and the structure and function of an ecological system are restored.

The invention discloses a method for removing grease in neodymium-iron-boron oil sludge waste by self-activated persulfate, which comprises the following specific steps: adding neodymium-iron-boron oil sludge waste into a stirring device, adjusting the concentration, pH value and temperature of slurry, then adding persulfate into the slurry, stirring for a certain time, and then dehydrating to obtain a qualified neodymium-iron-boron product. According to the method, hydroxyl free radicals and sulfate free radicals are generated through neodymium iron boron self-activation persulfate, grease substances in the neodymium iron boron oil sludge waste can be degraded into CO2 and H2O, rapid analysis of the grease substances from the surfaces of neodymium iron boron particles is achieved, and efficient deoiling can be achieved after solid-liquid separation. The method has the characteristics of simplicity in operation, high deoiling efficiency and wide application range.

The invention relates to an oil-water separation membrane as well as a preparation method and application thereof, and belongs to the field of gas field brine pretreatment. The oil-water separation membrane comprises a nanofiber membrane substrate and an MOFs layer loaded on at least part of the surface of the nanofiber membrane substrate, and the MOFs layer comprises two-dimensional MOFs nanosheets; the nanofiber membrane substrate is prepared by performing electrospinning on three-dimensional MOFs and an organic polymer; the two-dimensional MOFs nanosheet is obtained by secondary growth on the surface of the nanofiber membrane substrate through hydrothermal recrystallization. The oil-water separation membrane can be used for efficiently separating petroleum pollutants and solid suspended matters in the oil and gas field produced wastewater, and can be coupled with an advanced oxidation process based on sulfate free radicals to realize synchronous and efficient removal of oil, suspended particles and organic matters in the oil and gas field produced wastewater.