229 results about "Iron sulfide" patented technology

The present invention discloses a sulfurized nano zero-valent iron material, its preparation method and application, including: a core-shell structure sulfurized nano zero-valent iron material and a preparation method, the inner core of the sulfurized nano zero-valent iron is zero-valent iron, and the outer shell is Fe9S 10 , calculated by the mass of the sulfurized nano zero-valent iron, the mass percentage of zero-valent iron is 70-80%, and the mass percentage of the iron sulfide is 20-30%; the preparation method includes: placing iron powder in an H2S gas atmosphere for calcination, after the calcination is completed, cooling to room temperature to obtain the sulfurized nano zero-valent iron material. This material can be used for in-situ remediation of chlorinated hydrocarbon organic pollutants in groundwater. Compared with the prior art, the prepared sulfurized nano zero-valent iron is less likely to be oxidized and can overcome the problem of rapid passivation of nano zero-valent iron during the remediation process.

The present invention relates to magnetic, catalytically active, and radiosensitizing nanoparticles (NanoXcats) and the method for their production. A method is disclosed for the production of functionalized greigite nanoparticles with a narrowband size distribution (10-30 nm) for use in multimodal cancer therapy. NanoXcats are superparamagnetic Fe3S4 nanoparticles whose surfaces are equipped with polar functional groups. The surface structures of NanoXcats are suitable for conjugation with, or for covalent or electrostatic binding of, active substances, which may be cancer drugs, cell growth inhibitors, or NO donors. Due to the EPR effect, NanoXcats are preferentially internalized by tumor cells. The targeted accumulation of NanoXcats in tumor tissue is achieved by an external inhomogeneous magnetic field. NanoXcats exhibit enhanced catalytic activity in tumor cells.The catalytic activity of intracellular NanoXcats can be triggered, controlled, and enhanced by low-dose X-rays. Surface-bound drugs are additionally activated in tumor cells by the catalytic activity of NanoXcats. NanoXcats act as superoxide dismutase, nitric oxide synthase, and Fenton catalyst. They catalyze, for example, reactions of the superoxide anion radical to hydrogen peroxide, of L-arginine to NO, and of hydrogen peroxide to the hydroxyl radical.

The invention provides a treatment method for low-grade multi-metal gold concentrate, and relates to the technical field of comprehensive utilization of minerals. According to the treatment method of the low-grade multi-metal gold concentrate, most of iron and copper form iron-copper matte through pyrogenic smelting, meanwhile, gold is captured into the iron-copper matte, then iron-copper matte powder is obtained after water quenching and ball milling, the iron-copper matte powder is subjected to oxidation ammonia leaching, copper in the iron-copper matte is extracted, and the iron-copper matte powder is subjected to oxidation ammonia leaching to obtain the low-grade multi-metal gold concentrate. The obtained copper-containing ammonia leaching liquid is subjected to a traditional extraction-reverse extraction-electrodeposition process to obtain an electrodeposited copper product, ammonia leaching residues obtained after copper extraction are subjected to cyanidation leaching, gold in the ammonia leaching residues is extracted, cyanidation liquid is subjected to a traditional gold extraction process to obtain a gold product, the cyanidation tailings mainly comprise iron sulfide, the content of iron and sulfur in the tailings is high, and the content of sulfur in the tailings is high. And the subsequent cinder can be directly sold as an iron-making raw material. The amount of iron-silicon slag generated by the method is extremely low, and compared with a traditional molten pool smelting method, the comprehensive utilization rate of iron in the multi-metal gold concentrate is greatly increased.

The invention provides a biochar loaded sulfur modified zero-valent iron material and application thereof in groundwater remediation, and particularly relates to the technical field of inorganic materials. According to the biochar-loaded sulfur-modified zero-valent iron material, sulfur-modified zero-valent iron is loaded in a porous structure of biochar; the sulfur modified zero-valent iron has a core-shell structure; wherein the inner core of the core-shell structure is zero-valent iron, and the outer shell of the core-shell structure is iron sulfide. According to the biochar-loaded sulfur-modified zero-valent iron material provided by the invention, a sulfide layer is formed on the surface of zero-valent iron, so that a zero-valent iron core is prevented from being in direct contact with water or dissolved oxygen, and the durability of the zero-valent iron core is improved. Delocalized electrons in the sulfide layer promote the electron transfer process, and the catalytic performance of the material is enhanced. The biochar loaded sulfur modified zero-valent iron material provided by the invention is high in stability and wide in application range. Due to the multifunctionality of the material, the material has potential application value in a plurality of fields such as environmental restoration and pollutant degradation.

The invention relates to a high-performance environment-friendly synchronous grouting material and a preparation method thereof. The raw materials of the synchronous grouting material include, by weight, 10-15 parts of cement, 15-20 parts of slag, 20-30 parts of steel slag, 300-320 parts of mud-containing powdered fine sand, 0.075-0.1 parts of iron sulfide, 0.05-0.12 parts of graphene oxide, 0.03-0.09 parts of N,N-diisopropylformamide and 45-50 parts of water. The invention uses the mud-containing powdered fine sand as a raw material to replace bentonite and fine sand in the original synchronous grouting material, and mixes cement, slag, iron sulfide, graphene oxide and other materials. The components act synergistically, so that the prepared synchronous grouting material has excellent impermeability and compressive strength, short setting time, low carbon and environmental protection, and high economic and social benefits.

The invention discloses a method for realizing municipal sewage denitrification by combining pre-oxidation with a nano zero-valent iron loaded activated carbon carrier, and aims to solve the problems of slow growth speed of iron ammonia oxidation microorganisms, poor denitrification effect and the like in an iron ammonia oxidation process. The water treatment method comprises the following steps: 1, adding ferrate into municipal sewage to carry out pre-oxidation treatment, and adding polymeric ferric sulfide to carry out enhanced coagulation treatment; 2, inoculating mixed sludge into the SBR bioreactor, wherein the mixed sludge is composed of anaerobic ammonia oxidation granular sludge and municipal sludge; 3, introducing inert gas into the SBR reactor; and 4, introducing the pre-oxidized and coagulated sewage supernatant as inlet water into an SBR (Sequencing Batch Reactor) inoculated with sludge, and regularly adding carbon-loaded nano zero-valent iron into the SBR to complete denitrification of the municipal sewage. According to the invention, ferrate is added into municipal sewage for pre-oxidation through the front end, so that partial removal of organic matters and phosphorus is realized, and nitrogen removal of sewage is realized in combination with an activated carbon carrier loaded with nano zero-valent iron at the rear end.

The invention discloses an application of an azacyclo-thioketone compound, and particularly relates to an application of the azacyclo-thioketone compound in preparation of a vulcanizing agent. The azacyclo-thioketone compound is stable in property, not only has a thiocarbonyl sulfur atom of a reaction center in a molecular structure, but also has atoms with electron donating capability, such as nitrogen, oxygen and sulfur, on a heterocyclic ring, and selective flotation separation of copper, lead, zinc and iron sulfide minerals can be realized. However, no report about using the azacyclo-thioketone compound as the oxidized ore vulcanizing agent exists at present.

The invention provides a pharmaceutical wastewater treatment process. The pharmaceutical wastewater treatment process comprises the following steps: A1, pretreatment, A2, adsorption treatment, A3, oxidation treatment and A4, filtration treatment. In the step A2, a composite adsorbent comprising the following raw materials: attapulgite, activated carbon, carbon nanotubes, 4-carboxyphenylboronic acid, polyethyleneimine, sodium dithiocarbamate, epoxy resin E-44, deionized water and modified nano zero-valent iron is used, and self-repairing is realized through dynamic chemical bonds such as boric acid ester bonds, imine bonds and thiol-disulfide bonds; the adsorbent can be self-repaired during microscopic damage, so that the service life is prolonged, and relatively high adsorption capacity is kept. In the step A3, a gel microsphere oxidant comprising the following raw materials: hydrogen peroxide, potassium persulfate, copper-iron sulfide, nitrogen-doped carbon quantum dots, sodium alginate powder, sodium polyacrylate and a phosphate buffer solution is used, and efficient degradation is realized through a synergistic mechanism of free radical oxidation, non-free radical oxidation and photocatalysis.

The invention discloses a tetracycline hydrochloride-containing wastewater treatment method in the field of wastewater treatment, which comprises the following steps: introducing tetracycline hydrochloride-containing wastewater into a reactor, adding a multilevel structure iron and iron sulfide composite carbon material, and adjusting the system to a nearly neutral condition; then adding potassium peroxymonosulfate composite salt, starting a direct current system, and carrying out catalytic degradation reaction under specific current density; and finally recovering the catalyst through magnetic field separation. The preparation method comprises the following steps: grinding pyrite and hematite, ball-milling and mixing the ground pyrite and hematite with orange peel powder and sodium hydroxide, and carrying out microwave pyrolysis, acid washing and drying, hydrogen peroxide surface treatment and the like to obtain a final product. According to the method, efficient degradation of tetracycline hydrochloride under the neutral condition is achieved, the catalyst can be magnetically recycled, secondary pollution is avoided, and the method has the advantages of being low in cost, easy and convenient to operate, environmentally friendly and the like.

A nanocomposite material including iron sulfide (FeS2) nanoparticles, iron oxide (α-Fe2O3) nanoparticles, titanium dioxide (TiO2) nanoparticles, and graphitic carbon nitride (C3N4) nanosheets and a method of its preparation. The nanocomposite is used in a method of forming oxygen gas from water using an applied voltage and photoirradiation, a method of forming hydrogen gas from water using an applied voltage and photoirradiation, and a method of photodegrading organic pollutants using visible light photoirradiation.

The invention belongs to the field of catalysts for oxygen production through seawater electrolysis, and particularly discloses a chromium-doped ferronickel sulfide nanorod array material, a preparation method thereof and application of the chromium-doped ferronickel sulfide nanorod array material to oxygen evolution through seawater electrolysis. The material is a chromium-doped ferronickel sulfide grown in situ on a foamed ferronickel substrate, has components of NiFe, Ni3S2 and (Fe, Ni) 3S4, and is of a nanorod array structure. The preparation method comprises the following steps: putting the cleaned foam ferronickel into a solution containing a sulfur source and chromate, and obtaining the chromium-doped ferronickel sulfide nanorod array material by utilizing a hydrothermal method. As an alkaline water and seawater oxidation electrode, the composite material shows extremely excellent catalytic activity and stability, and has potential application value in the aspect of developing a transition metal OER catalyst for electrolyzing seawater to evolve oxygen.

The invention discloses a method for preparing a waste incineration flue gas demercuration adsorbent by utilizing microorganism induced corrosion waste battery slag, which comprises the following steps: firstly, preparing an SRB (sulfate reducing bacteria) seed culture medium by mixing SRB and an anaerobic culture medium, and then adding sulfur-rich waste battery slag into the SRB seed culture medium for anaerobic reaction; and after the reaction is finished, centrifuging, washing with deionized water and drying to obtain amorphous iron sulfide (FeSx) generated by microorganism induced corrosion. According to the method, the sulfate reducing bacteria culture medium is used as the precursor solution, the waste battery slag is subjected to anaerobic modification to prepare the mercury removal adsorbent, on one hand, high-valued and resource utilization of the sulfur-rich waste battery slag is achieved, and on the other hand, the method capable of rapidly, accurately and simply preparing the high-activity amorphous metal sulfide adsorbent in a large-scale mode is explored. Meanwhile, the type of the flue gas demercuration adsorbent is also expanded.

The invention relates to a ferrous sulfide cleaning method based on a ferrous sulfide cleaning device, and belongs to the technical field of petrochemical engineering treatment equipment. The method specifically comprises the steps that inspection preparation work before operation is conducted, a PLC control system injects industrial water and passivating agent liquid into a dissolving tank according to a given proportion, an electric pump B is started, the electric pump B can continuously supply liquid into equipment to be cleaned, meanwhile, a solution at the bottom of the equipment to be cleaned flows back into the dissolving tank, and the solution circularly enters and exits from the equipment to be cleaned; and according to the detected parameter change of the iron ion on-line monitor, the PLC control system automatically judges that the cleaning is finished when the change of the iron ion content does not exceed 10% in the latest two hours after the circulating cleaning is performed for 12 hours. The problems that manual matching control of industrial water and passivating agent liquid is not accurate, the iron ion content and the PH value cannot be analyzed on line, whether passivation cleaning is qualified or not cannot be automatically judged, and manual labor investment is large are solved.

The invention provides a preparation method of sulfurized zero-valent iron doped with sulfur in an iron body phase, which comprises the following specific steps: S1, adding zero-valent iron, ferrous sulfide and pyrite into alcohol, and uniformly stirring to obtain slurry to be ground; s2, a grinding tank of a wet-process ball mill is filled with grinding beads, the slurry to be ground is added into the wet-process ball mill to be ground, vulcanized zero-valent iron particles are obtained, the grinding time is 40-640 min, the rotating speed of the wet-process ball mill is 1800-2200 rpm, a stirrer is arranged in the grinding tank, and the rotating speed of the stirrer is 100-140 rpm; s3, taking out the sulfurized zero-valent iron particles from the wet ball mill, and putting the sulfurized zero-valent iron particles into magnetic separation equipment for separation; and S4, the separated sulfurized zero-valent iron particles are washed with ethyl alcohol and placed in a vacuum drying box to be dried at the temperature of 55-65 DEG C.

The invention relates to the technical field of water treatment, and provides a pyrite-reinforced Fenton system and a method for removing polycyclic aromatic hydrocarbon in underground water by using the pyrite-reinforced Fenton system. The pyrite reinforced Fenton system comprises hydrogen peroxide, ferrous iron and pyrite, wherein the adding amount ratio of the hydrogen peroxide to the ferrous iron to the pyrite is (0.1-5.0) mmol: (0.06-3.0) mmol: (0.5-1.0) g. The method for removing the polycyclic aromatic hydrocarbon in the underground water by adopting the pyrite-reinforced Fenton system comprises the following steps that ferrous iron, pyrite and hydrogen peroxide are sequentially added into an underground water solution polluted by the polycyclic aromatic hydrocarbon, treated underground water is obtained after the reaction is finished, the molar ratio of the ferrous iron to the polycyclic aromatic hydrocarbon is 0.6-30: 1, the molar ratio of the hydrogen peroxide to the polycyclic aromatic hydrocarbon is 1-50: 1, and the molar ratio of the pyrite to the polycyclic aromatic hydrocarbon is 1-20: 1. The mass concentration ratio of the pyrite to the polycyclic aromatic hydrocarbon is (35-80): 1. The pyrite is the most common iron sulfide mineral in the earth crust, raw materials are easy to obtain and environmentally friendly, and the pyrite can serve as a reducing agent to promote reduction of Fe (III) into Fe (II), increase the concentration of dissolved Fe (II), reduce generation of iron mud, increase the utilization rate of agents and promote continuous degradation of pollutants.

A method for synchronously activating persulfate using "light-heat-FeS2 / dust-free cloth" and a use. Metal iron sulfide FeS2 is loaded to the surface of black dust-free cloth ALC in an ultrasonic dispersion manner to form a FeS2 / ALC integrated photo-thermal catalyst. Persulfate is activated by using Fe2+, FeS2 / ALC absorbs solar energy to heat and activate the persulfate, and sunlight directly activates the persulfate, so that the "light-heat-FeS2 / dust-free cloth integrates three activation effects for synchronously activating the persulfate, achieving efficient degradation of organic pollutants in water.

The invention provides copper-doped iron sulfide as well as a preparation method and application thereof, and the preparation method of the copper-doped iron sulfide comprises the following steps: S1, preparing a metal salt solution from iron nitrate and copper nitrate; wherein in the metal salt solution, the sum of the molar concentration of iron ions and the molar concentration of copper ions is 0.003 mol / 25 ml to 0.06 mol / 25 ml; s2, dissolving a sulfur source in a metal salt solution to obtain a mixed solution, heating the mixed solution to 120-180 DEG C under a high-pressure condition, carrying out heat preservation for 12 hours, and separating solids in the mixed solution to obtain copper-doped iron sulfide; the molar concentration of the sulfur source in the mixed solution is 0.01-0.1 mol / 50ml; or, the metal salt solution is heated to 120-180 DEG C under the high-pressure condition, heat preservation is conducted for 12 h, a precursor is obtained, the precursor and elemental sulfur are mixed and then heated to 400 DEG C, heat preservation is conducted for 2 h, and the copper-doped iron sulfide is obtained. The adsorption capacity of the ferric sulfide mercury is improved, and meanwhile, the method has a remarkable economic advantage in the aspect of HgO removal.

The invention provides antibacterial hydrogel loaded with gold-iron phosphorus trisulfide nanosheets as well as a preparation method and application of the antibacterial hydrogel, and belongs to the technical field of hydrogel materials. The preparation method comprises the following steps: loading a prepared Au-FePS3 nanosheet into quaternary ammonium salt chitosan (QC)-oxidized dextran (OD) hydrogel; the Au-FePS3 nanosheet has the activity of peroxidase (GOx), the activity of peroxidase (POD) and the photo-thermal characteristic, meanwhile, GOx and POD have cascade catalytic activity, active oxygen mainly including. OH is generated, and the antibacterial and hypoglycemic effects can be achieved on diabetic wounds at the same time; the QC-OD hydrogel has the effects of resisting bacteria, stopping bleeding, preserving moisture and slowly releasing a load, can promote wound healing, and has degradability and injectability; in addition, the Au-FePS3 nanosheet is loaded in the QC-OD hydrogel, so that agglomeration of the nano enzyme in the use process can be avoided, and the enzyme activity is enhanced. The preparation process of the Au-FePS3 nanosheet and the QC-OD hydrogel is simple and rapid, the production efficiency is high, the Au-FePS3 nanosheet and the QC-OD hydrogel are expected to be used for clinical treatment, and the life quality of a patient is improved.

The invention provides a barium slag harmless treatment method which comprises the following steps: mixing barium slag and desulfurized waste gypsum, adding water, beating into slurry, adding diluted industrial acid, stirring, acidifying, and heating, so that most of barium in the slurry forms BaSO4; adding a coupling agent, stirring, and carrying out coupling and competitive coordination reaction with free barium ions and barium salt in the product; adding a sulfate solution, and carrying out double decomposition reaction with the chelate barium to generate a non-toxic BaSO4 precipitate; and adding a ferrous sulfate solution to combine the rest of ferrous ions and sulfur ions in the product to form an iron sulfide precipitate, carrying out filter pressing to obtain filter residues with the water content of 20-30%, and drying. According to the method, toxic metal barium in the barium slag can be converted into nontoxic barium sulfate, and sulfur ions are converted into stable ferric sulfate, so that the barium ions, sulfide and corrosive pH value in the treated product all reach the national general solid waste first-class slag standard. The invention also provides an application of the barium slag treated by the method in building and building material industries.

The invention discloses a method for removing iron and copper from molybdenite, which comprises the following steps: uniformly mixing the molybdenite and magnesium chloride, carrying out high-temperature vacuum melting, removing iron sulfide, copper oxide and other impurities in the molybdenite through vacuum chlorination melting, directly recycling magnesium chloride in a condensing disc in one step for reutilization, carrying out water leaching and acid leaching washing on roasting residues, and drying. Removing residual iron oxides and magnesium compounds generated by chlorination to obtain residues rich in molybdenum disulfide; according to the method, the iron and copper impurities in molybdenite are effectively removed in a vacuum chloridizing roasting and acid leaching mode, and the method has the advantages of being short in process, low in cost, high in metal recovery rate and small in environmental pollution.

The invention discloses a flotation method of low-grade phosphorite, which comprises the following steps: S1, grinding the low-grade phosphorite until the mass ratio of-0.074 mm is greater than 85%, and then mixing pulp; s2, the pH of the ore pulp is adjusted to 8-9, 200-500 g / t of a collecting agent xanthate, 240-300 g / t of an activating agent and 50-80 g / t of a collecting agent hydroximic acid are added for reverse flotation phosphorus extraction and iron removal operation, and iron-removed concentrate is obtained; s3, the pH of the concentrate product obtained in the step S2 is adjusted to be larger than 9.5, sodium silicate with the use amount being 1-2 kg / t and the modulus being 2.8-3 and a mixed collecting agent C1 with the use amount being 0.3-0.5 kg / t are added for first-stage direct flotation, then the mixed collecting agent C1 with the use amount being 1.5-2 kg / t is added for second-stage direct flotation, and dealuminated concentrate is obtained; and S4, the pH value of the concentrate product obtained in the step S3 is adjusted to 4-5, 200-300 g / t of WF-01 is added for reverse flotation, and magnesium-removed concentrate is obtained. The sulphide ore and the oxidized ore in the refractory phosphorite are collected and floated, removal of iron sulfide and iron oxide is achieved, and the quality and the recovery rate of the phosphate concentrate are remarkably improved.

The invention relates to a high-performance environment-friendly synchronous grouting material and a preparation method thereof, and the synchronous grouting material is prepared from the following raw materials in parts by weight: 10 to 15 parts of cement, 15 to 20 parts of slag, 20 to 30 parts of steel slag, 300 to 320 parts of silt-containing fine sand, 0.075 to 0.1 part of iron sulfide, 0.05 to 0.12 part of graphene oxide, 0.03 to 0.09 part of N, N-diisopropylformamide and 45 to 50 parts of water. According to the synchronous grouting material, the fine sand containing the mud powder is used as a raw material to replace bentonite, fine sand, compound cement, slag, iron sulfide, graphene oxide and other materials in an original synchronous grouting material, and all the components have a synergistic effect, so that the prepared synchronous grouting material has excellent anti-permeability performance and compressive strength, and is short in setting time, low-carbon and environment-friendly; and the method has relatively high economic benefits and social benefits.

The embodiment of the invention discloses an efficient utilization method of copper-iron sulfide ore. The method comprises the following steps: S1, mixing the copper-iron sulfide ore with magnesium oxide to obtain a mixed material; s2, heating the mixed material to a set temperature in an air or oxygen atmosphere for roasting, and collecting sulfur dioxide gas in tail gas by using a magnesium hydroxide solution to obtain magnesium sulfate; collecting a roasted solid-phase product; s3, washing the roasted solid-phase product with water to obtain a copper-iron oxide intermediate product; and S4, the copper-iron oxide intermediate product is reduced in the hydrogen atmosphere, and a copper and iron elementary substance mixture or a copper-iron alloy is obtained. The process flow is simplified, the energy consumption is low, the controllability of hydrogen reduction and the synergistic extraction of copper and iron resources are realized, the emission of a large amount of sulfur dioxide in the traditional pyrogenic process is avoided, and the method has remarkable environmental protection and economic benefits.

The present invention relates to a high-efficiency flotation separation method for complex copper-iron sulfide ore, and belongs to the technical field of flotation reagents. A combined collector is prepared, wherein the components of the combined collector are composed of 75-80 parts of aminotrimethylenephosphonic acid, 10-15 parts of xanthate, 5-10 parts of ethylthiocarbamate, and 0.5-1 part of polyol fatty acid ester, and the mass concentration of the combined collector is 30-50%; pulping, adding 200-800g / t of sulfiding agent to the complex copper-iron sulfide ore, grinding the ore to a fineness of -0.074mm accounting for 65-90%, and then pulping to a slurry with a solid concentration of 25-40wt%; flotation, subjecting the slurry with a solid concentration of 25-40wt% to a flotation operation of one coarse, three-four fine, and two-three sweeps to obtain copper concentrate and sulfur tailings, wherein the combined collector is used in the flotation process of the one coarse, three-four fine, and two-three sweeps. The present invention develops a new type of combined collector as a flotation agent for efficiently separating chalcopyrite and pyrite minerals, thereby achieving excellent flotation separation effect of complex copper-iron sulfide minerals in a slurry under low-alkali conditions.

The invention relates to the technical field of sodium ion battery negative electrode materials, and discloses a preparation method and application of a copper-iron sulfide nitrogen-doped porous carbon composite material, and the preparation method comprises the following steps: (1) mixing copper salt, potassium ferricyanide, a nitrogen source and polyethylene glycol, and carrying out ball milling to obtain a copper-iron Prussian blue precursor; (2) pyrolyzing the copper-iron Prussian blue precursor in an inert atmosphere, washing to remove impurities, and drying to obtain an intermediate product; and (3) carrying out heat treatment on the intermediate product and a sulfur source in an inert atmosphere to obtain the copper-iron sulfide / nitrogen-doped porous carbon composite material. Through the synergistic effect of compounding of the bimetallic sulfide and the nitrogen-doped porous carbon, sodium ions with larger ion radiuses are more easily embedded and deembedded in interlayer spacing, and meanwhile, abundant active sites are provided to enhance the storage of the ions, so that the lithium ion battery has outstanding rate capability and stable cycle performance.

The application provides a core-shell type nano zero-valent iron material, a preparation method and application, relates to the fields of environmental pollution remediation and nanometer material technology.The inner core of the material is phosphorus-doped nano zero-valent iron, the shell layer is a mixed layer of iron sulfide and iron oxide, and the particle has nano cracks extending from the core to the shell layer.The phosphorus doping causes lattice expansion and reduces the electron escape energy barrier, promoting the release of bulk phase electrons;the mixed layer of iron sulfide and iron oxide inhibits the hydrogen evolution side reaction and strengthens the electron transfer by virtue of hydrophobicity;the nano cracks continuously expose the internal active sites as mass transfer channels.Three synergies realize the efficient remediation of chlorinated organic matter contaminated groundwater or soil.

This disclosure relates to an arsenic fixation composition and its application method in a coal washing process. The arsenic fixation composition exhibits a good synergistic effect among dolomite powder, auxiliary absorbent, and catalyst, enabling the adsorption of arsenic from the coal washing process products after conversion. This reduces the arsenic content in the coal washing process products and improves arsenic removal efficiency. Using inexpensive, low-cost, and widely available dolomite powder as the main adsorbent reduces environmental pollution problems associated with traditional coal washing processes and improves their environmental performance. The use of a composition of petroleum sulfide and Fe-Mn composite oxides as the auxiliary absorbent allows for several advantages. First, the sulfur in petroleum sulfide converts trivalent arsenic in coal into pentavalent arsenic, facilitating absorption by the absorbent. Second, the Fe and Mn in the Fe-Mn composite oxides react with sulfur to form iron sulfide and manganese sulfide, preventing sulfur from entering the washing water and causing environmental pollution.

The invention discloses a soil matrix prepared on the basis of pyrite slag, a preparation method of the soil matrix comprises the steps that the pyrite slag, hair and sulfuric acid are mixed together for pretreatment, and the weight ratio of the pyrite slag to the hair to the sulfuric acid is (5-10): (0.5-2): (5-10). Hydrolyzed protein obtained through hydrolysis is complexed with heavy metal in the iron sulfide slag, so that the heavy metal in the pyrite slag can be well removed, the content of the heavy metal in the pyrite slag is remarkably reduced, a soil matrix prepared from the pyrite slag is suitable for plant growth, and heavy metal pollution of soil is reduced.

Disclosed herein are methods for controlling iron sulfide associated with a wellbore, downhole formation, reservoir or well, or infrastructure or equipment used in the extraction, production, processing, transportation, storage or disposal of a fluid, such as in pipelines and other infrastructure or equipment used in the oil and gas industries, as well as many other industries.

The invention discloses an iron sulfide nano-enzyme gel as well as a preparation method and application thereof, and belongs to the field of pharmaceutical preparations, and the iron sulfide nano-enzyme gel comprises the following components in percentage by mass: 5-6% of sodium alginate, 0.005-0.1% of anhydrous sodium sulfite, 2-5% of glycerol, 0.1-0.2% of iron sulfide nano-enzyme and the balance of purified water. The iron sulfide nano-enzyme gel prepared by the invention has the advantages of simple prescription and preparation process, low cost and the like, and has relatively high industrial application value. Components in the iron sulfide nano-enzyme gel are uniformly distributed and are not layered, and the iron sulfide nano-enzyme gel has slow-release and controlled-release effects on drug release and is easy to coat and use.