1008 results about "Iron salts" patented technology

The invention relates to the technical field of adsorbents, and particularly discloses an aluminum oxide type adsorbent and a preparation method thereof.The preparation method comprises the following steps that lanthanum salt, cerium salt and a polyethylene glycol aqueous solution are mixed to be uniform, then the mixture is mixed with gamma-Al2O3 to be uniform, pH is adjusted, standing is conducted, solid-liquid separation is conducted, drying and roasting are conducted, and a double-doped carrier is obtained; dispersing the double-doped carrier in a mixed solution containing 2-methylimidazole, ferric salt and zinc salt, adjusting the pH value, carrying out heating reaction, solid-liquid separation and drying in an inert atmosphere, grinding to obtain powder, and carrying out molding treatment on the powder to obtain a composite carrier; uniformly mixing the Ag modified molecular sieve with silica sol, coating the surface of the composite carrier with the mixture, and drying to obtain an adsorbent precursor; dipping an adsorbent precursor in the dispersion liquid, and after dipping, solid-liquid separation and drying, reactivating to obtain the aluminum oxide type adsorbent; the prepared adsorbent can synergistically and efficiently remove multiple impurities and is excellent in corrosion resistance.

The invention discloses a special phosphorus removal agent for deep phosphorus removal and a preparation method and application thereof, and relates to the field of phosphorus removal agents and preparation methods thereof.The phosphorus removal agent is prepared from a porous precursor, an activating agent and a dispersing agent, and the porous precursor comprises at least one of aluminum oxide, iron oxide, calcium oxide and magnesium oxide; the activating agent comprises at least one of lanthanum salt, cerium salt, zircon salt, magnesium salt and ferric salt. By optimizing the composition of the porous precursor and activating treatment, the phosphorus adsorption capacity is remarkably improved, the phosphorus removal agent also plays a role in micro-flocculation in the process of mixed adsorption with sewage, a wet adding mode is adopted, the adding amount can be flexibly adjusted according to the phosphorus concentration condition of inlet water and outlet water, and the phosphorus removal efficiency is improved. The phosphorus removal agent can reduce the total phosphorus concentration in tail water of a sewage treatment plant to 0.5 mg / L or below.

The invention belongs to the technical field of catalysts, and relates to a surface-reconstructed heterojunction catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt salt, ferric salt and praseodymium salt in deionized water, heating and spraying on a carrier to prepare praseodymium-doped ferrocobalt layered double hydroxide; mixing the praseodymium-doped ferrocobalt layered double hydroxide with a phosphorus source, and calcining in an inert atmosphere to prepare praseodymium-doped CoP / Fe2P; and carrying out electrooxidation treatment on the praseodymium doped CoP / Fe2P, so as to prepare the Pr6O11 cluster modified CoFeOOH heterojunction catalyst. Through cooperation of three technologies of spray thermal deposition, phosphating and electrooxidation, stable construction and electrochemical activation of a heterogeneous interface are realized, the corrosion resistance and chlorine evolution resistance competitive capacity of the catalyst in a chlorine-containing alkaline system are remarkably improved, the current density of 100 mA. Cm <-2 > can be achieved only through 223 mV overpotential, and meanwhile, stable operation is performed for 500 h.

The preparation method comprises the following steps: S1, preparing a phosphoric acid solution, a hydrogen peroxide solution, a Ti salt, a phosphor salt solution and a ferrite solution; s2, Ti salt and the ferrite solution are mixed, and a titanium iron salt solution is obtained; mixing the phosphoric acid solution and the phosphorus salt solution to obtain a phosphorus source solution; s3, adding the titanium iron salt solution into a reaction kettle, and adding the hydrogen peroxide solution; s4, adding the phosphorus salt solution into the reaction kettle to obtain yellow slurry; s5, after the color of the slurry is heated to be white, white slurry is obtained; s6, carrying out solid-liquid separation on the white slurry to obtain an iron phosphate dihydrate filter cake; and S7, drying and calcining the iron phosphate dihydrate filter cake to obtain the Ti-doped battery-grade anhydrous iron phosphate. The titanium-doped iron phosphate is firstly prepared by a one-step method, the pH value of the reaction system is controlled by controlling the molar ratio of the iron element to all phosphorus elements in total phosphorus, ammonium phosphate and phosphoric acid in the reaction system, and the retention of the Ti element in the finished product and the regulation and control of the iron-phosphorus ratio in a specified range are ensured.

The invention relates to a lightweight porous nickel ferrite composite electromagnetic absorbing material and a preparation method thereof, and belongs to the field of electromagnetic wave absorbing materials, and the lightweight porous nickel ferrite composite electromagnetic absorbing material is a porous electromagnetic absorbing material prepared by high-temperature annealing of a mixture containing ferric salt, nickel salt, an acetic acid solution and chitosan. The lightweight and porous nickel ferrite composite electromagnetic absorbing material has both lightweight and electromagnetic absorbing properties.

The invention discloses a method for preparing an iron-nickel-molybdenum-based electrocatalyst through combination of electrodeposition and rapid Joule heat and application of the method. The method comprises the steps that S1, a porous nickel substrate is pretreated, and the pretreated porous nickel substrate is obtained; s2, obtaining a nickel salt solution, a molybdenum salt solution and a ferric salt solution; s3, obtaining a mixed solution; s4, putting the mixed solution serving as electrolyte into a dual-electrode electrolytic tank, carrying out electro-deposition treatment by taking the pretreated porous nickel substrate as a cathode and an inert electrode as an anode, and washing and drying to obtain a Fe-Ni-Mo-LDH precursor; and S5, carrying out Joule thermal pyrolysis treatment on the Fe-Ni-Mo-LDH precursor, so as to obtain the iron-nickel-molybdenum based electrocatalyst. The preparation method can effectively regulate and control the size structure of the catalyst, and is suitable for preparing iron-nickel-molybdenum-based electrocatalysts with different substrates and different sizes; and the electrocatalyst has the advantages of uniform and stable nanostructure and high loading capacity. Meanwhile, the preparation method is short in reaction time, high in heating efficiency, high in repeatability and suitable for industrial large-scale production.

The invention provides a method for degrading organic phosphorus and recycling phosphorus in water in an ozone oxidation system. According to the method, a mode of adding iron or iron salt solution step by step is innovatively adopted, so that the degradation rate of phosphorus-containing organic matters in water, the generation rate of phosphate radicals and the removal of total phosphorus in water are remarkably improved. Besides, the treatment effect is evaluated by monitoring the organophosphorus mineralization rate (taking the generation amount of phosphate radicals as an index) and the removal rate of total phosphorus in water, experiments show that the method can increase the organophosphorus mineralization rate by 30% or above, and the removal rate of total phosphorus reaches 95%. Compared with the conventional one-time addition of iron or iron salt, the method has the advantages that the mineralization rate of organophosphorus and the removal rate of total phosphorus are effectively improved through a step-by-step addition strategy, the direct precipitation of an organophosphorus intermediate product is promoted, the use amount of ozone and the addition amount of iron are remarkably reduced, the reaction time is greatly shortened, and the recovery efficiency of phosphorus resources is further improved. The method is low in cost and suitable for advanced treatment of organic phosphorus-containing wastewater in the industries of pesticides, electroplating and the like.

The invention relates to the technical field of material preparation, and discloses a magnetic basalt fiber reinforced wear-resistant self-lubricating coating and a preparation method thereof, and a coating and a preparation method thereof, and the preparation method comprises the following steps: step 1, treating short-cut basalt fibers with an acid and / or alkali solution, mixing with an iron salt solution to obtain a reaction solution, carrying out hydrothermal reaction to obtain the magnetic basalt fiber loaded by the magnetic nanoparticles; step 2, adding a filler into the resin matrix solution, dispersing, and grinding to obtain resin slurry; and 3, adding the magnetic basalt fiber in the step 1 into the resin slurry in the step 2, adding a curing agent, and uniformly mixing to obtain the required coating. According to the method, the contact behavior and the abrasion mechanism of a friction pair are optimized, the friction coefficient and the abrasion rate are reduced, the tribological performance of the obtained coating is improved, the service life of a mechanical kinematic pair is prolonged, and the reliability and the stability of equipment operation are improved.

The invention relates to the technical field of electro-catalysis and hydrogen energy, in particular to a modified LDH-based catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing trimesic acid, water, an organic solvent, a nickel salt, a cobalt salt and an iron salt, carrying out electro-deposition, washing and drying to obtain a NiFeCo-LDH (TA) catalyst; the preparation method comprises the following steps: soaking a NiFeCo-LDH (TA) catalyst in a silver salt solution, washing and drying to obtain the modified LDH-based catalyst. The modified LDH-based catalyst provided by the invention can effectively resist chloride ion corrosion and inhibit dissolution of active metals in layered double hydroxides (LDH) under high current density in seawater, can reach industrial grade current density under relatively low overpotential, and can stably run for more than 1000 hours.

The invention belongs to the technical field of catalyst preparation and wastewater treatment, and particularly relates to an iron-nitrogen co-modified biochar catalyst as well as a preparation method and application thereof. Comprising the following steps: (1) pyrolyzing a biomass precursor at 200-400 DEG C in an inert gas atmosphere to obtain low-temperature biochar; (2) sufficiently mixing an iron salt solution, an organic nitrogen source and the low-temperature biochar through an impregnation method to obtain a mixed solution, and drying the mixed solution to obtain an iron-nitrogen co-modified biochar precursor; and (3) pyrolyzing the iron-nitrogen co-modified charcoal precursor at 600-1000 DEG C in an inert gas atmosphere to obtain the iron-nitrogen co-modified charcoal catalyst. The iron-nitrogen co-modified biochar catalyst is used for treating organic matters in high-salt organic wastewater, can realize catalytic polymerization removal of the organic matters, and effectively solves the problems that the number of active sites of biochar is limited, the electron transfer efficiency is relatively low, and the utilization efficiency of an oxidant in a persulfate activation technology is low and the mineralization ability is poor.

The present invention relates to a crop nutrition and fortifying composition comprising: i. Elemental sulfur; ii. One or more water insoluble or water soluble magnesium salts or derivatives or mixtures thereof; iii. One or more water-insoluble or water-soluble potash fertilizers or salts or derivatives or mixtures thereof; iv. One or more water insoluble or water soluble iron salts or derivatives or mixtures thereof; v. One or more water insoluble or water soluble zinc salts or derivatives or mixtures thereof; vi. One or more water-insoluble or water-soluble boron salts or derivatives or mixtures thereof; vii. At least one trace element selected from the group consisting of water-insoluble or water-soluble vanadium salts or derivatives or mixtures thereof and water-insoluble or water-soluble selenium salts or derivatives or mixtures thereof; and viii. One or more excipients wherein the composition comprises microparticles having a size in the range of 0.1 to 50 microns, and wherein the total content of the water-soluble salts, derivatives or mixtures in the composition does not exceed 80% of the total weight of the composition. The invention also relates to a method for preparing the crop nutrition and fortifying composition and a method for treating a plant, a seed, a crop, plant propagation material, a locus, parts thereof or soil with the crop nutrition and fortifying composition.

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.

The invention discloses a method for separating iron and lithium in a lithium iron phosphate iron salt leaching solution and recycling iron phosphate, and belongs to the technical field of waste lithium battery recycling. The method comprises the following steps: constructing a bis (2-ethylhexyl) phosphate and trioctyl decyl tertiary amine mixed extraction system for selective extraction of Fe < 3 + >, adopting phosphoric acid for reverse extraction, recycling phosphoric acid reverse extraction liquid, preparing iron phosphate and the like. According to the method, efficient enrichment of Fe < 3 + > and efficient elution of Fe < 3 + > from a loaded organic phase are realized. The purity of the raffinate Li solution is relatively high, so that the subsequent preparation of battery-grade lithium carbonate is facilitated. The strip liquor can be recycled for multiple times, an iron intermediate is precipitated through pH adjustment, and the FePO4 product can be finally prepared through washing, aging and high-temperature calcination. The method is high in extraction selectivity, recyclable in process and mild in operation condition, has good separation effect and resource utilization efficiency, and is suitable for popularization and application of a Fe / Li separation process in lithium battery recovery.

The invention relates to the technical field of lithium ion battery materials, in particular to a preparation method of a manganese iron carbonate precursor and a lithium manganese iron phosphate positive electrode material, which comprises the following steps: preparing a mixed salt solution from a bivalent manganese salt and a bivalent iron salt; adding pure water and the mixed salt solution into a first-stage reaction kettle, preparing a reaction base solution, and adding a first precipitator into the first-stage reaction kettle to obtain a first reaction product; enabling the first reaction product to flow into a second reaction kettle through overflow, and adding a second precipitator to obtain a second reaction product; and enabling the second reaction product to flow into a slurry transfer tank through overflow, washing and drying the second reaction product to obtain a manganese iron carbonate precursor, mixing a lithium source, a phosphorus source, a carbon source and the manganese iron carbonate precursor, and sintering to prepare the carbon-coated lithium iron manganese phosphate positive electrode material. The primary particle size of the prepared manganese iron carbonate precursor can be less than or equal to 200nm, and the rate capability and the cycling stability of a positive electrode material lithium ion battery finally prepared by sintering are improved.

The invention discloses a method for preparing calcium hydroxide with high specific surface area and high pore volume by a semi-dry method, which comprises the following steps: S1, adding an alcohol reagent into water, and uniformly mixing to obtain a solution A; s2, adding a composite cationic surfactant into the solution A, and dissolving to obtain a solution B; s3, adding an iron salt solution into the solution B, and uniformly mixing to obtain a solution C; s4, adding triethanolamine into the solution C, and performing ultrasonic dissolution to obtain a solution D; and S5, spraying the solution D into calcium oxide powder, continuously stirring, and reacting to prepare calcium hydroxide with high specific surface area and high pore volume. The calcium hydroxide prepared by the method has a high specific surface area and a rich pore structure, is powdery after reaction, and is relatively low in water content.

The invention discloses a high-solid-content MIL-101 (Fe) / PIM-1 mixed matrix membrane and a preparation method thereof, and belongs to the technical field of gas separation membranes. The preparation method comprises the following steps: firstly, dissolving an iron source in a PIM-1 polymer solution to form a homogeneous membrane casting solution; forming the obtained membrane casting solution, and removing the solvent to obtain a PIM-1 / Fe (II) composite substrate containing Fe (III); then, the substrate is alternately immersed in a terephthalic acid methanol solution and a ferric salt methanol solution, and MIL-101 (Fe) is generated in the polymer matrix through in-situ limited crystallization by layer-by-layer limited crystallization. According to the method, the problem of interfacial compatibility between the MOF filler and the polymer matrix is effectively solved, and high loading capacity (up to 52.9 wt.%) of MIL-101 (Fe) is realized without agglomeration. Meanwhile, the membrane has excellent COplasticizing resistance and long-term operation stability, and has a wide application prospect in the fields of carbon capture and the like.

The invention provides a preparation method of an iron and nitrogen co-doped biomass-based carbon material, which can be applied to the technical fields of environmental functional materials and advanced oxidation. The preparation method comprises the following steps: obtaining target charcoal precursor powder; mixing the charcoal precursor powder with soluble ferric salt and urea to form initial mixed powder, adding water into the initial powder, and drying after water bath to obtain mixed powder; and heating and calcining the mixed powder according to preset process parameters to obtain the iron and nitrogen co-doped biomass-based carbon material. The prepared iron and nitrogen co-doped biomass-based carbon material FeOx has a high specific surface area and a rich pore structure, FeOx is uniformly dispersed on a nitrogen-doped carbon substrate, ozone catalytic activity and electron conduction performance are improved, and reactive oxygen species (ROS) can be efficiently generated to degrade sulfamethoxazole.

The invention belongs to the technical field of nano materials, and relates to a carbon thermal reduction driven high-entropy oxide metastable-state material and a preparation method and application thereof.The preparation method comprises the steps that S1, carbon and soluble metal salt are dissolved in a solvent for ultrasonic treatment, and a metal salt solution and a carbon suspension are obtained; s2, adding a metal salt solution into the carbon suspension, adding strong base, and stirring to obtain a coprecipitation polymer; s3, re-dispersing the coprecipitation polymer in the solvent, adding extra ferric salt and urea, mixing and stirring, and freeze-drying the mixed solution to obtain precursor powder; s4, performing staged annealing treatment on the precursor powder under low oxygen partial pressure to obtain a carbon-loaded high-entropy oxide metastable-state material; the prepared high-entropy oxide metastable-state material is of an alloy phase and high-entropy oxide double-phase coupling structure, the polarization loss of electromagnetic waves is enhanced through a heterogeneous interface, and the high-entropy oxide metastable-state material has the advantages of being excellent in impedance matching and wide in electromagnetic wave absorbing bandwidth and can be widely applied to the fields of industrial electronics, medical communication and military stealth.

The invention discloses a catalytic electrode which comprises a substrate, and an anti-corrosion layer and a sulfur-phobic layer which are sequentially attached to the substrate, the substrate is a blank foamed nickel substrate, the anti-corrosion layer is formed by dipping the foamed nickel substrate with a ferric salt solution, and the sulfur-phobic layer is formed by processing a precursor with a cobalt salt solution through electro-deposition. Accordingly, a corresponding preparation method is also established, a blank foamed nickel substrate is adopted, firstly, the foamed nickel substrate is subjected to dipping treatment with an iron salt solution to obtain a precursor with an anti-corrosion layer, and then the precursor is subjected to electro-deposition treatment with a cobalt salt solution to form the sulfur-phobic layer on the anti-corrosion layer. Wherein the anti-corrosion layer can isolate a high-sulfur environment and prevent the substrate from being corroded; the sulfur phobic layer may prevent sulfur products from depositing and passivating the electrode. The catalytic electrode provided by the invention solves the problems of sulfur reaction corrosion and passivation, shows excellent catalytic activity and stability, and can be used for catalyzing sulfur oxidation reaction for a long time. In conclusion, the method has the advantages of mild conditions, simple process, economy and practicability, and has obvious large-scale industrial production potential.

The invention relates to the field of catalysts, in particular to a preparation method and application of an alumina-loaded copper-doped graphene-like catalyst, and the preparation method comprises the following steps: step 1, dispersing biomass in deionized water to form a suspension A; step 2, adding an aluminum salt and an iron salt into the turbid liquid A to form a turbid liquid B; step 3, adding a nitrogen source into the turbid liquid B to form impregnation liquid C; step 4, pouring the steeping liquor C into a beaker filled with alumina pellets, and drying to obtain dried pellets; and 5, roasting the dried pellets in a tubular furnace, cooling to room temperature, repeatedly washing with water, and drying to obtain the catalyst. The catalyst disclosed by the invention can be used for rapidly degrading refractory organic pollutants in water within 30 minutes under the synergism of microorganisms. The catalyst provided by the invention has good stability in the process of removing organic pollutants, and almost no metal ions are released.

The invention discloses a mixed ferrovanadium flow battery based on a redox targeting reaction, and belongs to the technical field of flow batteries. The problems that an existing vanadium-based flow battery is high in cost and limited in energy density are solved. According to the invention, the iron salt with low price is used for partially replacing the vanadium salt with high price, and the cost of the electrolyte is effectively reduced and the capacity and the energy density of the battery are effectively improved through the redox targeting reaction between the ferrovanadium electrolyte double-medium and the solid active substance; the battery keeps stable circulation and coulombic efficiency under relatively high current density, so that large-scale application of the vanadium-based flow battery becomes possible.

The invention provides a polyurethane material for leaking stoppage of a coal mine and a preparation method of the polyurethane material, and belongs to the technical field of polyurethane. The preparation method comprises the following steps: preparing melamine formaldehyde resin balls and ZnAl-LDHs, mixing and reacting the melamine formaldehyde resin balls and the ZnAl-LDHs to prepare LDH-MF composite balls, dipping in an iron salt solution, calcining to prepare composite balls, chloridizing with thionyl chloride, reacting with an ionic liquid and hyperbranched polyester to prepare IL / G composite balls, mixing with polyether polyol and a catalyst, adding into water, adding a foaming agent and silicone oil, heating, stirring and mixing, transferring into a mold, and carrying out extrusion molding to obtain a finished product. And adding diisocyanate, foaming, cooling to room temperature, drying and curing to obtain the polyurethane material for leaking stoppage of the coal mine. The prepared polyurethane material for leaking stoppage of the coal mine has good mechanical property, high temperature resistance and antibacterial property, good flexibility, good antistatic property and obviously improved flame retardance, and has a wide application prospect.

The invention relates to the technical field of novel environment-friendly materials, in particular to a ZnO / ZnFe2O4 desulfurization adsorbent with a stable porous structure and a preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure, and the preparation method of the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure comprises the following steps: step 1, preparing a zinc-iron salt mixed solution; preparing an alkaline mixed solution; step 2, dropwise adding the alkaline mixed solution prepared in the step 1 into the zinc-iron salt mixed solution while stirring, and adjusting the pH value to 9-10; then carrying out a water bath reaction to obtain a zinc iron-double metal hydroxide; 3, the zinc iron-bimetal hydroxide prepared in the step 2 is subjected to high-temperature calcination, and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained.The zinc iron-bimetal hydroxide (ZnFe-LDH) serves as a raw material, under the high-temperature calcination condition, the ZnFe-LDH is decomposed to generate ZnO and Fe2O3, then the ZnO and the Fe2O3 are further subjected to a solid-phase reaction to generate ZnFe2O4 (excessive ZnO), and the ZnO / ZnFe2O4 desulfurization adsorbent with the stable porous structure is obtained. And finally, the ZnO / ZnFe2O4 desulfurization composite adsorption material is prepared.

The invention relates to the technical field of water treatment, in particular to a nanofiltration membrane integration process for treating leachate of a garbage transfer station and a flocculating agent for a pretreatment section of the nanofiltration membrane integration process. According to the flocculating agent, the efficient composite flocculating agent is generated in situ through the cooperation of the ionic liquid grafted diatomite and the sulfonate modified branched polyamide cross-linked substance and the combination of the aluminum salt and the ferric salt, so that rapid removal of multiple pollutants and enhancement of floc stability are realized, and the follow-up membrane blockage risk is remarkably reduced. According to the process, an innovative pretreatment-graded nanofiltration-deep purification mode is adopted, membrane types of nanofiltration sections are optimized and screened according to pollutant characteristics, flexible combination of molecular step filtration, terminal combined light-Fenton oxidation, compact nanofiltration or reverse osmosis is realized, and efficient reduction of COD (Chemical Oxygen Demand) and salt content and energy consumption control are taken into consideration. The process has the advantages of stable effluent quality, low membrane pollution and greatly reduced medicament and operation cost, adapts to different emission standards, and has significant engineering application value.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a pretreatment method for improving the leaching rate and the carbon adsorption rate of high-sulfur-arsenic gold ore. Comprising the following steps that the high-sulfur-arsenic gold ore is ground and then prepared into ore pulp; a green oxygen activating agent and hydrogen peroxide are sequentially added into the ore pulp, oxidation pretreatment is conducted on the high-sulfur-arsenic gold ore, ore pulp activating liquid is formed, and the green oxygen activating agent is a mixture of calcium oxide, sodium persulfate and soluble bivalent iron salt; and adding a gold leaching agent into the ore pulp activation solution, adjusting the pH value of the ore pulp to 9-12, carrying out stirring gold leaching treatment, filtering to obtain a leaching solution, and then adding activated carbon to adsorb and extract gold. According to the method, a stronger oxidation environment is provided, meanwhile, the residual concentration of arsenate radicals in the solution is effectively reduced, the leaching rate of gold and the adsorption rate of activated carbon are greatly increased, excellent oxidation performance and environment friendliness are shown, and a more sustainable high-sulfur-arsenic gold ore pretreatment process is provided.

The invention discloses a metal element doped MnO2 and MnFe oxide composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of flue gas desulfurization and denitrification. The preparation method comprises the following steps: dissolving potassium permanganate, divalent manganese salt and doped metal salt in water for reaction to prepare metal element doped MnO2; and mixing and reacting with a template agent, ferric salt and sodium salt, drying and roasting to obtain the final catalyst. The MnO2 electronic structure is modulated by doping metal elements, and the three-dimensional porous structure of the MnFe oxide is constructed by using the template agent, so that the catalyst has efficient adsorption and strong catalytic oxidation capacity, NO and SO2 can be synergistically removed at the same time, and the catalyst has desulfurization and denitrification activity in a wide temperature range of 30-300 DEG C, and is suitable for industrial production. And liquid ammonia does not need to be used in the purification process, so that the purification agent is high in safety and is particularly suitable for purification treatment under complex flue gas conditions in the non-electric industry.

The invention belongs to the technical field of sewage treatment, and particularly relates to a preparation process of ferric salt-chitosan composite modified microorganism high-adaptability biochar. Through combination of the ferric salt-chitosan composite modified biochar carrier and the arsenic-antimony resistance functional flora, the composite modified biochar not only retains an excellent pore structure and specific surface area, but also forms a micro-ecological system with nutrition slow release and microenvironment buffering through a synergistic effect among materials; the immobilized functional flora further degrades or converts As and Sb forms through biotransformation, so that synergistic interaction of multiple mechanisms is realized, and the removal efficiency of arsenic-antimony combined pollution is greatly improved. The raw material biochar is wide in source and low in cost, the chitosan and the ferric salt are materials with good environmental compatibility, the whole preparation process is green and environmentally friendly, and the prepared biochar can be suitable for treatment of arsenic and antimony polluted wastewater with high concentration and complex components and has good application value.

The present invention relates to a crop nutrition and fortifying composition comprising an effective amount of the following ingredients: elemental sulfur; one or more magnesium salt derivatives or mixtures thereof; one or more potash fertilizers or salts or derivatives or mixtures thereof; one or more iron salts or derivatives or mixtures thereof; one or more zinc salts or derivatives or mixtures thereof; and one or more excipients. The composition comprises particles having a particle size ranging from 0.1 to 50 [mu] m wherein the elemental sulfur content is from 5% to 90% by weight; the content of the element magnesium is 0.1%-40% (weight percentage); the content of the element potassium is 0.1%-40% (weight percentage); the content of the element iron is 0.1%-45% (weight percentage); and the content of the element zinc is 0.1-45% of the total weight of the composition. The invention also relates to a method for preparing the crop nutrition and fortifying composition, and a method for treating a plant, a seed, a crop, plant propagation material, a locus, parts thereof or soil using the crop nutrition and fortifying composition.

The invention belongs to the technical field of ammonia synthesis catalysts, and particularly relates to an iron-based ammonia synthesis catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out coprecipitation reaction on a ferric salt solution, a mixed solution of auxiliary salt and a precipitant solution; aging the obtained precipitate slurry; the auxiliary agent salt comprises one or more of electronic auxiliary agent salt, barrier auxiliary agent salt and structural auxiliary agent salt; (2) filtering, washing, drying, roasting and crushing the obtained aging product to obtain a dry-based iron precursor; (3) mixing the iron precursor with a binder, adding an adhesive, and processing and molding the obtained mixture into a strip-shaped carrier; after the carrier is aged, the carrier is dried and roasted; and (4) impregnating the roasted product in a potassium salt solution by adopting a pore saturation impregnation method, and then drying and roasting the product to prepare the iron-based synthetic ammonia catalyst. The shape and the strength of the obtained catalyst are controllable, and the activity, the toxicity resistance and the mechanical strength of the catalyst can be improved at the same time.

The invention provides a remediation method for hexavalent chromium polluted underground water, and relates to the technical field of water treatment. According to the preparation method, rice hulls are adopted as raw materials and treated through an oxygen-limited pyrolysis-ferric salt dipping composite technology, and the rice hull-based iron-rich biochar material is obtained; loading microorganisms with the rice hull-based iron-rich biochar material to obtain an adsorption material; the adsorption material is used for carrying out adsorption treatment on the hexavalent chromium-containing polluted underground water. Aiming at Cr (VI) polluted underground water, a prepared rice husk-based iron-rich biomass material is adopted to load domesticated soil indigenous microorganisms, and the domesticated soil indigenous microorganisms are added into a nearly neutral Cr (VI) polluted soil / underground water reaction system, so that efficient reductive degradation of Cr (VI) is realized, and the influence mechanism of Fe < 3 + > is explored.