72 results about "Trichloroethylene" patented technology

The invention belongs to the technical field of organic pollution treatment, and relates to a biochar-LDH-nZVI-GO composite material for organic pollution remediation and a preparation method and application thereof.The preparation method comprises the steps that graphene oxide is ultrasonically dispersed in deionized water, magnesium salt and aluminum salt are added to form uniform suspension liquid, then the uniform suspension liquid is mixed with biochar suspension liquid, and the biochar-nZVI-GO composite material is obtained; carrying out pH (Potential of Hydrogen) regulation and a hydrothermal crystallization reaction, so as to prepare a biochar-Mg / Al-LDH-GO compound; and dispersing the compound in an organic solvent, sequentially adding FeSO4. 7H2O and a NaBH4 solution in an inert atmosphere to carry out a reduction reaction, and finally washing and drying to obtain the biochar-LDH-nZVI-GO composite material. The material shows high-efficiency removal capacity on various organic pollutants such as trichloroethylene, chlorobenzene and polychlorinated biphenyl, is suitable for high-efficiency green remediation of organic pollutants in soil and water, and has good popularization and application prospects.

The disclosure relates to a method of producing a multi-metal catalyst film and of producing a reactor system for catalytic removal of a wide variety of contaminants (for example, nitrate, nitrite, perchlorate, chlorate, chromate, selenate, chlorophenols, 2,4-D, dicamba, atrazine, trichloroacetic acid, bromochloroiodomethane, NDMA, TCE, TCA, chloroform, freons, RDX, HMX, TNT, PFOA, and PFOS) from water and wastewater. The disclosure also relates to a method of using the multi-metal catalyst for the removal of such contaminants and a system comprising the multi-metal catalyst film for removing such contaminants.

The invention discloses a high-self-cleaning weather-resistant GRTV insulating coating for electrical equipment, which comprises the following components: a film-forming agent consisting of solvent-type fluororesin, hydroxyl-terminated polysiloxane, acrylic resin and polyether polyol, a reinforcing agent consisting of at least two of MQ silicon resin, silicon dioxide, silicon nitride and fluororesin micro powder, a filling agent consisting of aluminum oxide, a curing agent consisting of a curing agent and a solvent, the curing agent is composed of two or three components of tetraethoxysilane, methyltriacetamide silane, dimethyl diacetamide silane or dibutyltin oxide, and trichloroethylene or butyl acetate is used as an organic solvent; the anti-pollution flashover coating is good in adhesive force, excellent in electrical insulation performance, good in hydrophobicity, high in anti-pollution flashover capacity, excellent in mildew resistance, algae resistance and anti-burst scattering characteristic, good in self-cleaning performance and capable of better exerting the anti-pollution flashover efficiency under the conditions of high salinity, high humidity and heavy pollution, and the insulation strength is not affected by environment temperature and moisture.

The invention relates to the technical field of gas adsorption materials, in particular to a plasma modified UiO-66-NH2 / activated carbon composite filter material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding activated carbon into a UiO-66-NH2 precursor solution, vacuumizing in a vacuum drying oven for 1-3 hours, then transferring into a reaction kettle, heating to 80-120 DEG C, reacting for 20-25 hours, cooling to room temperature, washing and drying to obtain a UiO-66-NH2 / activated carbon composite material; and placing the UiO-66-NH2 / activated carbon composite material in a plasma reactor, and carrying out plasma treatment by taking H2 / Ar as a working gas to obtain the plasma-modified UiO-66-NH2 / activated carbon composite material. According to the invention, UiO-66-NH2 is loaded in the activated carbon, so that the effects of increasing the specific surface area of the activated carbon and developing a microporous structure are achieved, the adsorption capacity of low-concentration trichloro ethylene reaches 281 mg / g, and the UiO-66-NH2 loaded activated carbon is a filter material for effectively adsorbing trichloro ethylene (TCE).

The invention discloses a method for treating a metal surface through ethylene glycol butyl ether after a fire disaster. The treatment method comprises the following steps that modified ethylene glycol butyl ether is prepared; sequentially adding modified ethylene glycol butyl ether serving as a main chemical solution into the reaction kettle according to the quantitative percentage, and carrying out mixed reaction; standing the mixed chemical solution in the step S2 for 10-20 minutes, and adding water to dilute the mixed solution according to the remaining percentage of the volume of the reaction kettle; the ethylene glycol butyl ether is modified and serves as a main component of the cleaning solution, the sodium phosphate, the epichlorohydrin, the sodium pyrophosphate and the trichloroethylene are mixed according to a proper proportion, a proper amount of water is added for dilution, and the cleaning solution is obtained. Dirt formed by fire disasters on the metal surface can be effectively removed, and metal objects cannot be damaged.

The present invention relates to the technical field of nanopowder preparation, and discloses a method for preparing a nitrogen-doped biochar-loaded iron nitride composite material. The process is as follows: (1) potassium ferrate, urea, and waste tea powder are ground and mixed in proportion to obtain a first mixture; (2) the first mixture is reacted in a temperature range of 50-70°C to obtain a second mixture; (3) the second mixture is reacted in a temperature range of 600-800°C for 1-3 hours, and then cooled to room temperature to obtain a third mixture; (4) the third mixture is washed and dried to obtain a nitrogen-doped biochar-loaded iron nitride composite material. Compared with the existing preparation process, the beneficial effect of the present invention is that the operation steps only include grinding, stirring, heating, etc., the operation is simpler, the overall process only involves one pyrolysis, the energy consumption is lower, and the toxic gas ammonia is not used, and the operation is safer. The material can degrade trichloroethylene without an anaerobic environment and can be used for the remediation of organochlorine-contaminated groundwater environment.

The application discloses low-cost sulfidized nano zero-valent iron synthesized by using pyrite as raw material and application thereof. The low-cost sulfidized nano zero-valent iron is obtained by using cheap pyrite powder as raw material, adding a small amount of anhydrous FeCl3, and through ball milling, drying and hydrogen reduction. The pyrite powder to which a small amount of anhydrous FeCl3 is added is ball milled by using zirconia ball milling beads which are easy to clean but not easy to be polluted, and then the sulfidized nano zero-valent iron is prepared after drying and reduction. By adjusting parameters such as ball powder ratio, FeCl3 addition amount, heating rate and holding time, the low-cost sulfidized nano zero-valent iron with a particle size of 200-300 nm, zero-valent iron content accounting for more than 90% of total iron content and preparation cost being 11% of that of a laboratory liquid-phase synthesis method is prepared. The material can effectively degrade trichloroethylene (TCE) and florfenicol (FF), has a small hydrogen production amount and a high electron efficiency. The preparation method is simple and easy to operate, has a low cost and has a large-scale production prospect, the degradation performance of pollutants is close to that of the laboratory-prepared sulfidized nano zero-valent iron, and far exceeds that of nano zero-valent iron, and therefore the material has a prospect of being applied to actual groundwater pollution remediation.

The present invention relates to systems and methods for catalytic removal of oxidized contaminants (for example, nitrite, chromate, chlorate, trichloroethene, CFC-11, 4-nonylphenol, RDX, and perfluorooctanoate) from water and wastewater. In some aspects, the catalytic method of removing oxidized contaminants comprises using precious metal nanoparticles as catalysts to reduce the oxidized contaminants.

There is provided a method for producing chlorofluorobutane (CFB) by forming chlorinated butadiene by dimerizing trichloroethylene (TCE) and fluorinating hydrogen atoms of the chlorinated butadiene. Trichloroethylene (TCE) is dimerized by using a dimer represented by the following formula (1) as a solvent and in the presence of a free radical generating agent at a temperature of 100° C. or higher. Hexachlorobutadiene (C4Cl6) is produced from the above dimer by chlorination and dehydrochlorination reaction, and further, the chlorofluorobutane (CFB) is produced by fluorinating the hexachlorobutadiene.

The invention belongs to the technical field of ceramic precursors, and particularly relates to a silicon-boron-carbon-nitrogen ceramic precursor with a main chain containing alkynyl and a preparation method of the silicon-boron-carbon-nitrogen ceramic precursor. Comprising the following steps: (1) dropwise adding an n-butyllithium solution into an ether solvent, stirring, continuously dropwise adding trichloroethylene, and reacting to obtain an alkynyl dilithium salt turbid solution; (2) adding boron trichloride into the alkynyl dilithium salt turbid solution to carry out primary dechlorination polycondensation reaction, and dropwise adding dichlorosilane to carry out secondary dechlorination polycondensation reaction after the reaction is completed; (3) adding hexamethyldisilazane into the system in the step (2) to carry out an end-capping reaction, collecting supernate after the reaction is finished, and distilling at normal pressure to remove the solvent, so as to obtain a silicon-boron-carbon-nitrogen ceramic precursor crude product; and (4) dissolving the silicon-boron-carbon-nitrogen ceramic precursor crude product in an organic solvent, carrying out dialysis treatment, and carrying out atmospheric distillation on the solution in a dialysis membrane to remove the solvent so as to obtain the silicon-boron-carbon-nitrogen ceramic precursor with the main chain containing alkynyl, and the ceramic yield of the silicon-boron-carbon-nitrogen ceramic precursor in the high-temperature ceramization process can reach more than 70%.

The invention provides a preparation method of a novel photocatalytic material Bi2O2SO4 / Bi, N, S-TiO2, and belongs to the field of inorganic catalytic materials. The composite photocatalyst Bi2O2SO4 / Bi, N, S-TiO2 is prepared by adopting a sol-gel method, the preparation process is simple, the equipment requirement is low, and the production cost is low. The novel photocatalytic material is a heterojunction material composed of Bi2O2SO4 and TiO2 doped with three elements of Bi, N and S. The invention further discloses a preparation method of the novel photocatalytic material. The PMS (peroxymonosulfate KHSO5 is greater than or equal to 42%, and KHSO5.0.5 KHSO4.0.5 K2SO4) has good capability of degrading organic pollutants by activating PMS (peroxymonosulfate KHSO5 is greater than or equal to 42%, KHSO5.0.5 Under the irradiation of visible light, when a trichloroethylene (TCE) solution with the concentration of 7 mg / L is used as a substrate, the degradation rate reaches 93% in 30 min, the catalyst concentration is 1.5 g / L, and the PMS concentration is 1.7 g / L.

The application discloses a method for preparing high dehalogenation activity micro-nano zero-valent iron material by micro-humid ball milling, and the method is characterized in that trace water, iron powder and modified substances are mixed according to a certain proportion to obtain the micro-nano ZVI material by ball milling. The material can be used for in-situ remediation and treatment of groundwater containing chlorinated organic pollutants, has higher activity compared with dry ball-milling zero-valent iron material, can completely remove target pollutants trichloroethylene in 1 hour at the fastest speed, and has good pH adaptability and still has faster degradation efficiency under alkaline conditions. The micro-nano ZVI and modified material prepared by the micro-humid ball milling method are a kind of environmental remediation material with low cost, high remediation efficiency, green and low carbon, and are easy to popularize, and have good environmental and economic benefits.

The invention belongs to the technical field of soil remediation, and particularly relates to a remediation material for degrading polluted soil chlorinated hydrocarbon and a preparation method of the remediation material. The repair material for degrading the chlorinated hydrocarbon in the polluted soil is prepared from the following raw materials: humic acid, rhamnolipid, a biological agent and diatomite. The final repairing material utilizes mutual complementation and mutual synergism of humic acid, rhamnolipid, the biological agent and diatomite, has a remarkable effect in the aspect of degrading trichloroethylene, cis-1, 2-dichloroethylene, trichloroethane and 1, 2-dichloroethane, can be used for repairing chlorohydrocarbon polluted soil, and achieves a better degradation effect.

The invention belongs to the technical field of metal injection molding blank solvent degreasing, aims to solve the problems of complex solvent degreasing process, long degreasing time and many degreasing defects, and discloses a rapid solvent degreasing method for a wax-based W-Ni-Fe alloy injection molding blank. According to the method, a blank formed by wax-based W-Ni-Fe alloy feed injection molding is degreased, during degreasing, the blank is put into trichloroethylene and degreased in a water bath kettle, the dosage of the trichloroethylene is more than 7 times of the volume of the blank, and the relative degreasing rate is calculated according to the mass of the blank before and after degreasing and the theoretical degreasing rate. According to the method, the degreasing time can be greatly shortened, the degreasing efficiency is improved, blank deformation is small, and component fluctuation cannot be caused.

A kind of high permeability warm recycling agent permeability evaluation method and index for in-place hot recycling technology, comprising the following steps: mixing aged asphalt with new asphalt, adding warm mixing agent to develop warm mixing, to prepare warm asphalt;In the flowing state of warm asphalt, use brass or stainless steel ball with diameter of 15mm to uniformly dip asphalt, and let it cool and solidify naturally;Wrap with recycling agent mixed with tracer, stand at room temperature for 12h to let it penetrate into asphalt layer naturally;Dissolve asphalt layer layer by layer with trichloroethylene, extract the solution, and then test the extract by FTIR, the peak area of tracer gradually decreases with the depth of layer from the infrared spectrum absorption peak, and the penetration concentration attenuation equation of recycling agent is obtained by fitting the data of layer, so that the permeability of warm recycling agent can be evaluated.The present application is simple and easy to operate, can quickly detect the penetration performance of warm recycling agent, and has good application prospect.

The invention discloses a microwave-sensitive nickel slag composite asphalt pavement material. The microwave-sensitive nickel slag composite asphalt pavement material comprises the following components in percentage: 60-70% of nickel slag aggregate, 5-6% of matrix asphalt, 3-5% of a wave-absorbing modifier and 2-6% of mineral powder. A preparation method of the microwave-sensitive nickel slag composite asphalt pavement material is used for preparing the microwave-sensitive nickel slag composite asphalt pavement material and comprises the following steps: S1, preparing the raw materials according to the preset proportion; s2, nickel slag is pretreated, and nickel slag coarse aggregate and nickel slag fine aggregate are obtained; s3, modifying a wave-absorbing agent, ultrasonically dispersing the ferromagnetic powder and a silane coupling agent in trichloroethylene, and removing a solvent to obtain a surface functionalized wave-absorbing modifier; s4, heating matrix asphalt, sequentially adding the nickel slag aggregate obtained in the step S2, the wave absorbing agent obtained in the step S3 and mineral powder, and then performing high-speed shearing and stirring to obtain a mixture; and S5, carrying out compression molding on the mixture obtained in the step S4, and controlling the void ratio to be 3-6%.

The application provides a method for optimizing and controlling the reduction efficiency of trichloroethylene by in-situ bio-sulfidized zero-valent iron, selects zero-valent iron with particle sizes of 2 μm, 7 μm and 23 μm, and a dosage of 10 g; selects xanthan gum modified micron iron slurry with masses of 1.5 g, 3.0 g and 6.0 g; collects water medium with a buried depth of 2-3 m, enriches and domesticates trichloroethylene-tolerant and SO4 2‑ reduction function, the water medium sample is collected, and the microorganism domestication is performed within 24 hours; the xanthan gum modified zero-valent iron slurry and the domesticated bacteria liquid are injected into an in-situ groundwater remediation simulation device. ‑ Through the technical scheme of the application, the synergistic effect of multiple microorganisms is achieved, the degree of trichloroethylene dechlorination in the presence of natural electron acceptor NO3 ‑ is improved, the influence of toxic by-products is reduced, the electron selectivity is enhanced, the long-term performance of zero-valent iron is strengthened, finally the reduction path of "chemical dechlorination and biological denitrification" is realized, and the application prospect is good.

This invention relates to a carboxymethyl cellulose-modified nanomaterial of zero-valent iron, its preparation method, and its application in the remediation of trichloroethylene-contaminated water or groundwater. The material is prepared by mixing sodium carboxymethyl cellulose with a water-soluble ferrous salt in a deoxygenated aqueous phase, followed by reduction with an oxygen-free sodium borohydride aqueous solution under nitrogen protection. The sodium carboxymethyl cellulose forms a coating layer on the surface of the zero-valent iron through carboxylate groups, distributing the zero-valent iron particles on the carboxymethyl cellulose framework or the coating layer surface. Scanning electron microscopy analysis shows that the zero-valent iron particles are mainly distributed in the range of 80-150 nm; the zeta potential measured in anhydrous ethanol dispersion is -47 mV. The material is added at 0.5-5.0 g / L to trichloroethylene-contaminated water or groundwater and reacted under sealed, light-protected conditions at pH 6.0-8.0 and a temperature of 20-35°C for the reduction and dechlorination treatment of trichloroethylene.

The present invention belongs to the field of environmental microbial technology, and specifically discloses two trichloroethylene-assimilating and degrading bacteria, Cytobacillus oceanisediminis SH48 and Lysinibacillus fusiformis SH13, and their applications. The strains of Cytobacillus oceanisediminis SH48 and Lysinibacillus fusiformis SH13 are deposited in the China Center for Type Culture Collection, with the deposit numbers being CCTCC M 2023370 and CCTCC M 2023371 respectively, and the deposit date being March 21, 2023. The growth of these two strains has low requirements for environmental conditions. They can use trichloroethylene as the sole carbon source and energy source for their own growth without adding additional growth substrates, effectively degrade chlorinated hydrocarbon pollutants, release inorganic free chloride ions, and there is no accumulation of toxic intermediate products. The strain or the microbial agent prepared therefrom can be used for the bioremediation of the soil or groundwater in industrial polluted sites contaminated with chlorinated hydrocarbons, and has important application prospects.

The invention provides a purification treatment system for acetylene chlorination tail gas in industrial production of trichloroethylene, and relates to the technical field of tail gas treatment systems. A purification treatment system for acetylene chlorination tail gas in industrial production of trichloroethylene comprises a vacuum pump, an after-cooler, an absorption tower, an alkaline tower, a tail gas fan and a combustion furnace, the inlet end of the after-cooler is communicated with the gas outlet end of the vacuum pump, and the outlet end of the after-cooler is communicated with the gas inlet end of the absorption tower; the gas outlet end of the absorption tower is communicated with the gas inlet end of the alkaline washing tower; the gas outlet end of the alkaline washing tower is communicated with the gas inlet end of the tail gas fan; the gas outlet end of the tail gas fan communicates with the combustion furnace. By adopting the method, the problem that VOC generated by acetylene chlorination tail gas in the production process exceeds the standard can be solved, tail water is not generated any more, and the output of salt-containing organic wastewater is greatly reduced.

The invention relates to an anti-winding leather collar suitable for a vortex spinning process and a treatment method thereof.The anti-winding leather collar comprises a leather collar body and a composite coating, the composite coating is formed by coating the surface of the leather collar body with a composite coating, the composite coating comprises a component A and a component B, the component A comprises dichloromethane and phenyl 3-isocyanate, and the component B comprises dichloromethane and phenyl 3-isocyanate; and the component B comprises trichloroethylene. The anti-winding leather collar has the effect of improving and preventing the stability of the anti-winding leather collar.

This invention relates to the field of road engineering, specifically to a method for identifying the asphalt-mineral powder interface transition zone based on a dynamic shear rheometer. The method includes: preparing an asphalt-trichloroethylene solution; preparing asphalt mastic and separating free asphalt based on the asphalt-trichloroethylene solution and filtered mineral powder; performing a first elution on the asphalt mastic to obtain an asphalt sample; repeating the asphalt mastic elution process n times; determining the asphalt film thickness of each asphalt sample; conducting a dynamic shear rheological test on each asphalt sample; calculating and plotting the complex shear modulus master curve based on the complex shear modulus, the time-temperature equivalence principle, the WLF equation, and the CAM model; identifying the first asphalt sample whose complex shear modulus master curve shows a significant change trend relative to the previous eluted sample, and obtaining the asphalt-mineral powder interface transition zone thickness based on the asphalt film thickness of the asphalt sample with the significant change trend. This invention accurately identifies the thickness of the asphalt-mineral powder interface transition zone.

This invention relates to the field of trichloroethylene technology and discloses a trichloroethylene distillation separation apparatus and method, including a desorption tower bottom tank. The output end of the desorption tower bottom tank is connected to a low-boiling tower, and the output end of the low-boiling tower is connected to a low-boiling tower reflux tank and a trichloroethylene tower, wherein the output end of the low-boiling tower reflux tank is connected to the input end of the low-boiling tower, and the output end of the trichloroethylene tower is connected to a TCE tower reflux tank and a TCE intermediate tank. In this invention, a trichloroethylene distillation separation method is implemented by designing a TCE stirred tank and adding silver ammonia solution and color-changing silica gel inside the stirred tank to remove acidic impurities contained in trichloroethylene during the distillation process. This achieves secondary purification of trichloroethylene after the distillation process, reducing the likelihood of decomposition and instability of trichloroethylene during actual use, which can corrode the surface of cleaned devices and cleaning equipment, directly damaging the performance of the devices and the cleaning equipment.

The invention discloses a high-entropy alloy catalyst for catalytic conversion of multi-component VOCs and a preparation method of the high-entropy alloy catalyst, and belongs to the field of catalytic chemistry and environmental chemistry. The PdCuNiInMo nano particles are loaded on the nano SiO2 carrier, and the PdCuNiInMo / SiO2 catalyst is formed by roasting in an atmosphere containing H2. The preparation method comprises the following steps: preparing the PdH nano particles by a solvothermal method, forming the PdCuNiInMo nano particles by a hydrothermal synthesis method, and finally loading the PdCuNiInMo nano particles on the nano SiO2 carrier by an impregnation method. And roasting the loaded catalyst in an H2 atmosphere, so as to form the PdCuNiInMo / SiO2 catalyst. The PdCuNiInMo / SiO2 catalyst prepared by the invention has good catalytic activity and selectivity on mixed VOCs (Volatile Organic Compounds) of trichloroethylene and ethanol, and has a good application prospect in the field of catalysis.

The invention belongs to the technical field of groundwater remediation, and relates to a method for remedying chlorohydrocarbon polluted groundwater by coupling ozone micro-nano bubbles with a circulating well, which comprises the following steps: installing a circulating well in a simulation tank, filling the tank with medium sand to simulate a groundwater aquifer medium, then introducing trichloroethylene sewage with a set concentration, and constructing a groundwater pollution simulation system; ozone micro-nano bubbles are generated; and coupling the ozone micro-nano bubbles with the aerodynamic circulation well to carry out underground water remediation. According to the method, volcanic rock is used as a catalyst, ozone micro-nano bubbles and a pneumatic circulating well technology are creatively fused, and typical chlorinated hydrocarbon-trichloroethylene polluted underground water is treated in a targeted mode. Experimental comparison shows that compared with traditional hydrogen peroxide or metal salt catalysis, the method has the advantages that on the basis of saving the cost, the remediation period can be remarkably shortened, the pollutant removal rate is increased, secondary pollution is reduced, the underground water remediation process is accelerated, the dual goals of energy conservation and high efficiency are achieved, and the method has important practical application value and wide popularization prospects.

The invention provides an experimental device for enhancing removal of trichloroethylene by in-situ biological sulfurized zero-valent iron. The experimental device comprises a sample injection bag, a peristaltic pump, a seepage column and a post-treatment column, a stainless steel dispensing needle head is inserted into the sample injection bag, the outer end of the dispensing needle head is connected with a Luer internal rotary joint, and the Luer internal rotary joint is connected with a first polytetrafluoroethylene hard tube through a first hose; the right end of the peristaltic pump is connected with the sample injection bag; the upper end of the seepage column is connected with the post-treatment column; the lower end is connected with the peristaltic pump; openings are formed in the side wall of 30 cm in the middle of the seepage column every 5 cm, and the openings are connected through three-way connectors; the middle of the seepage column is divided into six layers to be filled with quartz sand, domestication bacterium liquid is evenly injected into the surface of each layer of quartz sand, and xanthan gum modified zero-valent iron slurry is injected into the seepage column from the side face and the bottom of the seepage column in a multi-point circulation mode. According to the technical scheme, the system error of trichloroethylene removal by the experimental device is reduced, the true degradation phase of a filling medium to trichloroethylene is reduced, the problems of pre-vulcanization and experimental dechlorination separation are solved, the in-situ biological vulcanization and dechlorination effects are improved, and the remediation target of'simultaneous vulcanization and dechlorination 'is achieved.

The invention belongs to the field of environmental chemistry, and particularly relates to a preparation method and application of a nitrogen-modified zero-valent iron composite material based on the molten salt effect, and the preparation method specifically comprises the steps that iron powder, ferroferric oxide and sodium amide are mixed and subjected to ball milling, and the nitrogen-modified zero-valent iron material is obtained. In the ball milling process, a NaOH-NaNH2 melting interface can be formed in the ball milling tank, so that in-situ formation of nitrogen modified zero-valent iron is promoted. The trichloroethylene removal capability of the nitrogen-modified zero-valent iron material obtained in the preparation process is remarkably enhanced. According to the method, the problem that the nitrogen-modified zero-valent iron is difficult to prepare is solved, and a technical foundation is laid for safe and efficient low-cost short-range macro preparation of the nitrogen-modified zero-valent iron. The method provided by the invention is simple and efficient in process, low in cost and environment-friendly, and can be widely applied to preparation of nitrogen-modified zero-valent iron.

The application provides an experimental device for strengthening in-situ biological sulfuration of zero-valent iron to remove trichloroethylene, which comprises a sample inlet bag, a peristaltic pump, a seepage column and a post-treatment column; a point glue needle head made of stainless steel is inserted into the sample inlet bag, the outer end of the point glue needle head is connected with a luer female connector, the luer female connector is connected with a first polytetrafluoroethylene hard pipe through a first hose; the right end of the peristaltic pump is connected with the sample inlet bag, and the left end is connected with the seepage column; the upper end of the seepage column is connected with the post-treatment column; the lower end is connected with the peristaltic pump; the sidewall of the middle 30 cm of the seepage column is opened every 5 cm, and all are connected through three-way connectors; the middle of the seepage column is filled with quartz sand in 6 layers, and the surface of each layer of quartz sand is uniformly injected with domesticated bacteria liquid; xanthan gum modified zero-valent iron slurry is injected into the seepage column from multiple points on the side and bottom of the seepage column. Through the technical scheme of the application, the system error of the experimental device for removing trichloroethylene is reduced, the degradation truth of the trichloroethylene by the filling medium is restored, the problem of the separation of pre-sulfuration and experimental dechlorination is solved, the in-situ biological sulfuration dechlorination effect is improved, and the repair goal of'sulfuration and dechlorination simultaneously' is achieved.

The application provides copper and sulfur co-lattice doped nano zero-valent iron and a preparation method and application thereof, and is based on the ironophilic and sulfurophilic properties of elements, successfully improves the copper content in the nano zero-valent iron lattice, changes the physicochemical properties, improves the stability and the removal capacity of trichloroethylene and florfenicol. When the material is synthesized, copper chloride is used as the copper source (sulfurophilic), iron trichloride is used as the iron source, and a sulfur source (sodium hydrosulfite) with ironophilic and sulfurophilic properties is added as a "bridge". Through a simple one-step method, the copper and sulfur co-lattice doped nano zero-valent iron material is synthesized by means of dissolution, mixing, stirring, drying and grinding. The crystal structure of the copper and sulfur co-lattice doped nano zero-valent iron material prepared by the application is complete, the copper and sulfur co-lattice are doped in the nano zero-valent iron, rather than forming copper elements on the surface of the iron. The sulfur content and electron transfer capacity of the copper and sulfur co-lattice doped nano zero-valent iron material are improved, and the material has superhydrophobicity. The stability of the material is significantly improved, that is, the life in water can reach more than 2 years, and after being exposed to air for 30 days, the material can maintain 80% of the zero-valent iron content and hydrophobicity. The material can also enhance the removal capacity of organic pollutants trichloroethylene and florfenicol in groundwater. The synthesis method provided by the application is simple and easy to operate, the material performance is significantly improved, can provide a new design idea for co-lattice doped iron-based nano materials, and can be applied to the remediation of contaminated groundwater.

The invention discloses a sulfur-nickel zero-valent iron material for deep hydrogenolysis dechlorination based on a high-valence sulfur source and application, and belongs to the field of environmental remediation materials. According to the method, a one-step ball milling process is adopted, an iron source, a nickel source and a high-valence sulfur source are subjected to co-ball milling, and the sulfur-nickel co-doped ball-milled zero-valent iron material is prepared. Compared with a conventional material using a low-valence sulfur source, the high-valence sulfur source is introduced, so that the microstructure and the surface chemical state of the material can be remarkably regulated and controlled, the degradation path of the chlorinated hydrocarbon is effectively changed, the chlorinated hydrocarbon is mainly degraded through a deep reduction hydrogenolysis path, and the degradation efficiency of the chlorinated hydrocarbon is improved. And a beta-elimination way which easily generates toxic by-products such as dichloroethylene and vinyl chloride is not used. The material shows more thorough dechlorination capability and higher electronic efficiency in the remediation of chlorinated hydrocarbon pollutants such as trichloroethylene, meanwhile, the dissolution amount of nickel ions is kept extremely low, and the material is environment-friendly. The invention provides a novel technical approach for developing a novel efficient and stable chlorohydrocarbon repair material without accumulation of byproducts.