282 results about "Zerovalent iron" 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 invention discloses a method for degrading dioxin in fly ash and stabilizing heavy metals, which comprises the following steps: carrying out water washing treatment on the fly ash, and carrying out solid-liquid separation to obtain water washing slag; mixing the washed slag with water, adding zero-valent iron and sulfite, carrying out hydrothermal treatment, and carrying out solid-liquid separation to obtain hydrothermal slag and hydrothermal liquid; according to the method for degradation of dioxin in fly ash and stabilization of heavy metal in cooperation with degradation of dioxin in fly ash, under the combined action of zero-valent iron, chlorite and a hydrothermal environment, efficient degradation of dioxin in fly ash can be rapidly achieved under the lower reaction condition, stabilization of heavy metal in fly ash can be synchronously achieved, and the method is suitable for industrial production. The method has the advantages of being low in cost, mild in reaction condition, high in treatment efficiency, good in treatment effect, environmentally friendly and the like, can effectively solve the problems existing in the prior art, provides powerful support for harmless treatment and resource utilization of the waste incineration fly ash, and has wide engineering application prospects.

The invention provides nitrogen / sulfur co-doped charcoal loaded nano zero-valent iron as well as a preparation method and application thereof, and relates to the technical field of sewage treatment. The nitrogen / sulfur co-doped biochar loaded nano zero-valent iron is a composite material prepared by taking nitrogen / sulfur co-doped biochar as a carrier material and loading nano zero-valent iron; the nitrogen / sulfur co-doped biochar is prepared from the following raw materials: melamine, diphenyl disulfide and walnut shells. The nitrogen / sulfur co-doped biochar loaded nano zero-valent iron prepared by the invention combines the porous characteristic of biochar and the high reaction activity of nano zero-valent iron, not only has excellent oxidation resistance and corrosion resistance, but also retains good hydrophilicity and magnetism, can efficiently remove antibiotic pollutants in the environment, and has a good application prospect. And actual operation and recycling are facilitated.

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.

An in-situ biogas purification method for anaerobic digestion of sludge based on exogenous hydrogen supply relates to the field of solid waste resource utilization and renewable energy technology. The purpose of the present invention is to solve the problems of low hydrogen solubility and insufficient carbon dioxide bioconversion in the biogas purification process, as well as the inhibitory effect of excessive hydrogen dosage on biogas production by anaerobic digestion of sludge. The present invention utilizes the anaerobic digestion process of sludge in an anaerobic environment to produce biogas, and adds hydrogen to the process by direct hydrogen input or zero-valent iron corrosion, so that hydrogen penetrates into the liquid phase. The hydrogenotrophic methanogens in the system use hydrogen as an electron donor and carbon dioxide in the biogas produced by anaerobic digestion of sludge as an electron acceptor to convert hydrogen and carbon dioxide into methane to achieve in-situ biogas purification. The present invention can obtain an in-situ biogas purification method for anaerobic digestion of sludge based on exogenous hydrogen supply.

The invention relates to the technical field of environmental pollution control, in particular to application of grass acidified zero-valent iron in in-situ remediation of organic polluted underground water. According to the preparation method, oxalic acid and micron zero-valent iron are evenly mixed and then subjected to ball milling treatment, oxalic acid zero-valent iron of a core-shell structure is obtained through post-treatment, the oxalic acid zero-valent iron has high electron transfer efficiency, Fe < 2 + > / Fe < 3 + > circulation is further regulated and controlled through oxalic acid coordination in the oxalic acid zero-valent iron, interface electron transfer is enhanced, and the preparation method is suitable for industrial production. Peroxyacetic acid is promoted to be activated to generate various active oxygen species, and efficient degradation of organic pollutants is achieved. The invention solves the problems of low zero-valent iron electron transfer efficiency, single active oxygen species, secondary pollution of iron sludge and the like in the process of degrading organic pollutants by using the existing zero-valent iron advanced oxidation technology.

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 discloses a preparation method and application of phytic acid modified zero-valent iron. The method comprises the following steps: (1) mixing phytate and liquid phytic acid according to a molar ratio of (5: 5)-(8: 2), and preparing a buffer solution with the concentration of 0.05-0.5 mol / L; (2) adding micron or nano zero-valent iron into a buffer solution according to a solid-to-liquid ratio of 1: 10 to 1: 50 (g / mL), and transferring to a polytetrafluoroethylene reaction kettle; (3) under the protection of nitrogen, reacting for 6-48 hours under the conditions that the temperature is 20-80 DEG C and the oscillation rate is 100-1000 rpm, and controlling the pH value to be 3.5-5.5; and (4) after the reaction, carrying out suction filtration, ethanol-water alternate washing and vacuum drying to prepare the modified zero-valent iron with the surface coated with the phytic acid iron complex. A stable chelation layer is formed on the surface of phytic acid molecules and zero-valent iron, the oxidation resistance, dispersity and heavy metal adsorption capacity of the material are remarkably improved, and the material is suitable for efficient repair of industrial wastewater.

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 relates to the field of material preparation and organic pollution treatment, and discloses an iron-based composite material and a preparation method and application thereof. The iron-based composite material comprises micron-sized zero-valent iron particles, a modified shell layer formed on the surfaces of the micron-sized zero-valent iron particles and a carbon material dispersed on the peripheries of the micron-sized zero-valent iron particles, and the modified shell layer is formed by enabling metal sulfide and citrate to react with the micron-sized zero-valent iron particles through electrolysis. According to the iron-based composite material, zero-valent iron is modified by adopting metal sulfide and citrate, and is loaded by adopting a carbon material, so that the dispersity of the zero-valent iron can be improved, the service life of the iron-based composite material can be further prolonged, and the degradation capacity of the iron-based composite material can be further improved.

The invention relates to a modified charcoal loaded ball-milled vulcanized zero-valent iron material as well as a preparation method and application thereof. The method comprises the following steps: carrying out chemical modification on ball-milled elemental sulfur and zero-valent iron to synthesize ball-milled vulcanized zero-valent iron; and then loading to straw biochar through chemical reaction to obtain the modified biochar loaded ball-milled vulcanized zero-valent iron composite material. In the starting period of anaerobic digestion of the high-temperature and high-solid-content sludge, a certain proportion of modified charcoal loaded ball-milled vulcanized zero-valent iron composite material is added into an anaerobic digestion reactor, the high-solid-content thermal hydrolysis-high-temperature anaerobic digestion efficiency can be remarkably improved, meanwhile, the acid accumulation effect affected by high temperature and high load is relieved, and the high-temperature anaerobic digestion efficiency is improved. Meanwhile, the biotoxicity of heavy metal Cr (VI, Cu, Cr and the like in the sludge is reduced, harmlessness, reduction and recycling of the municipal sludge are achieved, and the method has a wide application prospect in the aspect of municipal sludge treatment.

The invention belongs to the technical field of water treatment, and particularly relates to a method for regulating and controlling a nanoscale zero-valent iron shell structure to enhance the reaction activity of the nanoscale zero-valent iron shell structure. The carbon-doped nano zero-valent iron is of a core-shell structure; the carbon-doped nanoscale zero-valent iron comprises a nanoscale zero-valent iron core with carbon gradient doping and an iron carbide shell layer located on the surface of the nanoscale zero-valent iron core. By means of collision between grinding balls and material (Fe and C) particles, deformation and crushing of the ground material particles are achieved through friction force, shearing force, tension and the like, an oxidation shell layer of nanoscale zero-valent iron is broken, Fe < 0 > is exposed on the surface of the material and further doped with activated carbon to form an iron carbide shell layer to construct Fe-C double-active sites, the reaction activity of the material is improved, and the service life of the material is prolonged. The reducibility and electron transfer capability of the nZVI are effectively improved, meanwhile, after the nZVI is subjected to the action of mechanical force, the lattice spacing of the nZVI is increased, the material property is changed, and the removal efficiency of the nZVI to pollutants is further improved.

The invention relates to the technical field of environmental restoration, in particular to a core-shell structure nitrided zero-valent iron material obtained through gas-phase thermochemical synthesis as well as a preparation method and application of the core-shell structure nitrided zero-valent iron material. The invention provides a core-shell structure nitrided zero-valent iron material prepared through gas-phase thermochemical synthesis. The core of the core-shell structure nitrided zero-valent iron material is zero-valent iron, and the shell of the core-shell structure nitrided zero-valent iron material is Fe4.4N; the content of zero-valent iron is 60-70wt% based on the mass of the nitrided zero-valent iron material with the core-shell structure. According to the core-shell structure nitrided nano zero-valent iron material obtained through gas-phase chemical thermal synthesis, zero-valent iron is used as a core, and Fe4.4N is used as a shell; the obtained core-shell nitrided nano zero-valent iron material has a more stable surface iron-nitrogen compound, has higher electronic efficiency, and can overcome the problem of rapid passivation of nano zero-valent iron in the repair process.

The invention relates to the technical field of wastewater treatment and resource recovery, and discloses an organophosphorus degradation and recovery system based on double-cathode electro-Fenton reaction, comprising: an electrolytic tank for accommodating organophosphorus wastewater to be treated; the anode is arranged in the electrolytic tank and is electrically connected with an anode of a power supply; the oxidizing agent generating cathode is arranged in the electrolytic tank and is used for generating hydrogen peroxide in situ under a power-on condition; the metal reduction cathode is arranged in the electrolytic tank and is used for adsorbing and reducing ferric ions; the metal source is composed of zero-valent iron or iron alloy, is not directly and electrically connected with the power source, and is arranged in an electric field acting area established by the anode and the at least one cathode. Through the design of inductive slow-release iron supply and double-cathode collaborative circulation, a series of problems of uncontrollable iron ion release, high iron sludge yield, low catalyst utilization efficiency, difficulty in resource recovery and the like in the traditional electro-Fenton technology are effectively solved.

According to the red mud-based composite material and the preparation method and application thereof, bentonite, red mud and biomass are mixed in a proper amount of water according to the mass ratio of 1: 1: (1-10), and first suspension liquid is formed; drying the first suspension to obtain a precursor of the red mud-based composite material; the precursor is subjected to a carbon thermal reaction at 300-700 DEG C, ferric oxide in the red mud is converted into zero-valent iron, and the red mud-based composite material is obtained. The red mud is alkaline and promotes manganese ions to form insoluble precipitates, the unique structure and ion exchange capacity of the bentonite can effectively solidify the manganese ions, the biomass has a high specific surface area and a developed pore structure, and the manganese ions are physically adsorbed through Van der Waals' force and pore interception; ferric oxide in the red mud is converted into zero-valent iron in the carbothermal reaction process, and the zero-valent iron can catalytically oxidize ammonia nitrogen, so that the red mud-based composite material synchronously solves the problem of combined pollution of manganese and ammonia nitrogen in the soil.

The invention relates to an oxygen vacancy-rich modified zero-valent iron / biochar composite material and application thereof. The modified zero-valent iron / biochar composite material comprises a biochar carrier and zero-valent iron loaded on the biochar carrier, the surface of the zero-valent iron is coated with sulfur-containing ferrides and / or boron-containing ferrides, and the surface of the zero-valent iron contains rich oxygen vacancies; the modified zero-valent iron / biochar composite material is specifically prepared by the following steps: dispersing a biochar carrier and zero-valent iron in oxygen-free water, and grinding; adding a sulfur source or a boron source into the ground suspension, fully stirring and grinding, and drying; and soaking in a reducing solution, calcining at high temperature, and cooling to obtain the modified zero-valent iron / biochar composite material. Compared with the prior art, the modified zero-valent iron / biochar composite material prepared by the invention can be synergistically used with a compound oxidant to realize effective remediation of organic contaminated soil.

The invention provides a method for removing nitrate in water by using a modified zero-valent iron aerogel electrocatalyst, which comprises the following steps: preparing a mixed solution of ferrous sulfate and sodium sulfide, preparing a sodium borohydride solution, mixing and magnetically stirring the mixed solution and the sodium borohydride solution to obtain black colloid, and finally obtaining vulcanized zero-valent iron aerogel, dispersing the obtained sulfurized zero-valent iron aerogel and a Nafion solution in absolute ethyl alcohol to prepare a catalyst mixed solution; potassium nitrate and potassium hydroxide are dissolved in a pure water solution to serve as electrolyte, a sulfurized zero-valent iron aerogel electrode is used as a cathode, a platinum sheet is used as an anode, a mercuric oxide electrode is used as a reference electrode, and an electrocatalytic reduction reaction is carried out by using a three-electrode system. The technology not only can improve the efficiency of water nitrate pollution treatment, but also conforms to the concept of green and low-carbon development, and has a wide environment application prospect.

The invention provides a biochar-zero-valent iron enhanced bentonite-based vertical barrier material for combined polluted underground water, which comprises sodium modified calcium bentonite and sandy soil, and also comprises biochar and slow-release zero-valent iron particles, and the slow-release zero-valent iron particles are formed by mixing and stirring micron-sized zero-valent iron and sodium alginate. Related preparation methods and uses are also provided. The anti-seepage performance of the biochar-zero-valent iron enhanced bentonite-based vertical barrier material for combined polluted underground water meets the anti-seepage requirement that the permeability coefficient is lower than 10 <-9 > cm / s under the stress of heavy metal, chlorinated hydrocarbon and micro-plastic combined polluted underground water, heavy metal can be effectively reduced and precipitated, chlorinated hydrocarbon is dechlorinated, and micro-plastic is adsorbed; therefore, the concentration of composite pollutants in underground water is reduced, and the long-acting performance of the vertical barrier material is improved.

The present invention discloses a biochar-supported rhamnolipid-coated nano-zero valent iron modified material, its preparation method and application. The modified nano-zero valent iron material includes biomass carbon, rhamnolipid and nano-zero valent iron. The rhamnolipid is modified on the surface of the nano-zero valent iron and loaded on the biomass carbon. The mass ratio of nano-zero valent iron, rhamnolipid and biochar is 1:0.05-0.2:0.5-2. The preparation method is to mix the rhamnolipid solution with the ferrous sulfate solution, then mix with the biomass carbon, and dropwise add the NaHB4 solution for reaction to obtain the modified nano-zero valent iron material. The biochar-supported rhamnolipid-coated nano-zero valent iron material of the present invention has the advantages of good stability, high reaction activity, strong dispersion performance, etc. It has good removal efficiency for the chlorinated flame retardant dechlorane in the environment and will not cause secondary pollution, and has potential good application value and broad application prospects in the field of organic polluted soil and water treatment.

The invention relates to the technical field of environmental engineering, and particularly discloses an underground water remediation and activity monitoring system based on a zero-valent iron-based nano material, which comprises composite nano particles consisting of a zero-valent iron core, a ferrous sulfide / humic acid dynamic compensation layer and a temperature-sensitive polymer, through a crack self-adaptive regulation and control module driven by a sensor array and a temperature difference driving migration module based on an underground water temperature gradient, the system can realize automatic circulation of selective adsorption, desorption and degradation of pollutants under different temperature conditions through the combined action of a phase change behavior of a temperature-sensitive polymer and a dynamic compensation layer; the stability and the repair efficiency of the nanoparticles are improved; compared with a traditional scheme, the method has the advantages that on-demand response activity adjusting capacity and an accurate injection path guiding mechanism are achieved, the technical bottlenecks that in the groundwater heterogeneous environment, migration of a repairing agent is uncontrollable, and adsorption selectivity is poor are avoided, and good engineering adaptability and practical application prospects are achieved.

The invention provides a method for preparing zero-valent iron with quantitative specific surface area, which comprises the following specific steps: S1, adding zero-valent iron powder and absolute ethyl alcohol into a container, and uniformly stirring to form slurry to be ground; s2, filling a wet ball mill with grinding beads, and grinding the to-be-ground slurry to obtain slurry; s3, taking out the slurry and separating; and S4, the separated zero-valent iron particles are dried, the grinding time ranges from 10 min to 200 min, the size of grinding beads ranges from 0.4 mm to 2.0 mm, the filling amount of the grinding beads ranges from 0.25 kg to 0.75 kg, the rotating speed of a stirring shaft of the wet ball mill ranges from 1000 rpm to 2000 rpm, and the specific surface area of the zero-valent iron obtained through ball milling is controlled by controlling the ball milling time, the size of the ball milling beads, the filling amount of the ball milling beads and the rotating speed of the stirring shaft of the wet ball mill.

The invention belongs to the field of water treatment, and relates to a method for removing copper ions in water by combining phosphorylated micron iron and green rust. The method comprises the following steps: adding phosphorylated micron iron and green rust into to-be-treated water containing copper ions, and carrying out stirring reaction to remove the copper ions. According to the method, the phosphorylated micron zero-valent iron can efficiently remove the bivalent copper ions in the water within a short time under the synergistic effect of the green rust, the method is a novel water treatment method for removing the copper ions in the water, a new method is provided for water pollution treatment, and the method has important significance on water pollution treatment.

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 provides a method for reactivating passivated and inactivated zero-valent iron and application in wastewater treatment.The method comprises the following specific steps that S1, zero-valent iron powder is added into wastewater to be stirred till the zero-valent iron is passivated and inactivated, a magnet is used for separating the passivated and inactivated zero-valent iron powder from the wastewater, and the zero-valent iron powder is obtained; washing the passivated and inactivated zero-valent iron powder with deionized water, and drying the zero-valent iron powder under nitrogen flow; s2, a wet ball mill is filled with grinding beads, passivated zero-valent iron powder and pure ethyl alcohol are added into the wet ball mill, a circulating water cooling system is used for controlling the temperature of a ball milling chamber of the wet ball mill to be 8-12 DEG C, the ball milling rotating speed is 1900-2100 rpm, the ball milling time is 9-11 min, the particle size of the ball milling beads is 0.3-0.5 mm, and the mass of the ball milling beads is 0.7-0.8 kg; and S3, the activated zero-valent iron powder is added into the wastewater to be stirred.

The invention discloses a preparation method and application of modified zero-valent iron based on wet ball milling, and the preparation method is characterized by comprising the following steps: pre-mixing commercially available zero-valent iron powder and a transition metal salt solution, introducing into a crowbar type high-energy ball mill for ball milling, and eluting an aqueous solution to obtain the modified zero-valent iron. The transition metal salt is a salt in which a transition metal is a main metal component, such as a Co salt, an Ni salt, or a Cu salt. The concentration in the solution is 0.01-1.00 mol / L according to the amount of substance concentration, and the concentration of the zero-valent iron in the solution is 1-500 g / L according to the solid-to-liquid ratio. The obtained wet ball-milling modified zero-valent iron can be applied to removal of (similar) metal pollutants in industrial wastewater. The prepared zero-valent iron has high reaction activity, compared with traditional zero-valent iron, the rate of removing metal and metalloid pollutants in industrial wastewater can be increased by 30-600 times, and the zero-valent iron has the advantages of being easy and convenient to operate, capable of achieving large-scale production, low in pollutant treatment cost and the like.

The invention discloses a submicron sphere soil remediation material as well as a preparation method and application thereof. The remediation material takes modified silicon dioxide as an inner core, nano zero-valent iron as a middle layer and aluminum oxide as an outer layer; the mass ratio of the inner core to the middle layer to the outer layer is (30-50): (20-40): (10-50). The remediation material synthesized through the method has the advantages of being good in soil compatibility, high in cyclic utilization rate, high in heavy metal removal efficiency and the like, and the target of low-energy-consumption remediation of the heavy metal contaminated soil can be achieved.

The invention discloses a preparation method of a zero-valent iron reduction material with micro-nano size and water stability, and belongs to the field of underground water pollutant degradation materials. The method comprises the following steps: 1) uniformly mixing micron-sized zero-valent iron powder and hexadecyl trimethoxy silane, and carrying out mechanical ball milling; and 2) cleaning the material with a cleaning agent, and drying to obtain the zero-valent iron reduction material with micro-nano size and water stability. According to the preparation method, a mechanical ball milling method and a hexadecyl trimethoxy silane surface modification method are utilized to cooperate, so that micro-nano size and surface hydrophobicity of the zero-valent iron are stabilized, agglomeration and passivation of the zero-valent iron in water are inhibited, and the reduction activity and water stability of the zero-valent iron material are improved; the reducing capacity of the material on pollutants such as halogenated hydrocarbon and heavy metal in water is remarkably improved, the material can be kept stable in water for a long time, the technical problems that the micro-nano zero-valent iron reducing material is prone to inactivation and difficult to store are solved, and waste of material resources can be reduced.

The invention discloses an iron-carbon composite material for heavy metal contaminated soil remediation and a preparation method of the iron-carbon composite material, and belongs to the field of heavy metal contaminated soil remediation. The iron-carbon composite material comprises rape straw, hydroxyapatite, zero-valent iron, sulfydryl functionalized magnetic cerium oxide and nitrogen-doped graphene quantum dot-sodium alginate. The sulfydryl-functionalized magnetic cerium oxide is prepared from cerium nitrate and ferric nitrate through precipitation, calcination and sulfhydrylation, and the nitrogen-doped graphene quantum dot-sodium alginate is prepared from citric acid and urea through microwave reaction, dialysis, mixing and freeze drying; the preparation method comprises the following steps: treating straws and hydroxyapatite to obtain ball-milled phosphorus-containing biochar, mixing the ball-milled phosphorus-containing biochar with zero-valent iron and two modifiers, and carrying out molding and high-temperature calcination to obtain the phosphorus-containing biochar-based composite material. The material has a remarkable remediation effect on the heavy metal contaminated soil, can effectively reduce the activity of heavy metals in the soil, has the characteristics of environmental friendliness and high stability, and is suitable for treating the soil compositely contaminated by the heavy metals such as cadmium and lead.

The invention discloses a thickening suspending agent containing modified attapulgite and application of the thickening suspending agent, and belongs to the technical field of thickening suspending agents. After acidification treatment, the content of impurities on the surface of attapulgite is reduced, the surface area and the porous property are increased, the load rate of zero-valent iron can be increased, and the utilization rate of the zero-valent iron is increased. Zero-valent iron is uniformly loaded on tubular pore channels or the surface of attapulgite in the form of nano-particles, so that the surface roughness of the composite powder is increased, stronger steric hindrance can be formed around pesticide particles, and the pesticide particles are prevented from being gathered and enlarged due to collision, so that sedimentation is reduced, and the composite powder has good suspension property and dispersity; the load of zero-valent iron can endow the thickening suspending agent with the heavy metal chelating capability; through two times of intercalation treatment, the modified zero-valent iron composite attapulgite powder can be uniformly loaded between graphene oxide layers, the graphene oxide can assist the dispersion of the attapulgite to avoid agglomeration, and the existence of the graphene oxide can improve the thermal stability of the thickening suspending agent.

The invention discloses a preparation method of a phosphoric acid modified biochar loaded nano zero-valent iron material, which comprises the following steps: preparing biochar from waste cotton straws, modifying the biochar with phosphoric acid, and loading nano zero-valent iron on the modified biochar to obtain the phosphoric acid modified biochar loaded nano zero-valent iron material. The phosphoric acid modified charcoal loaded nano zero-valent iron material prepared by the preparation method disclosed by the invention can adsorb and reduce high-toxicity hexavalent chromium (Cr (VI)), and waste cotton straws are recycled, so that the environment can be sustainably developed.