168results about How to "Increase adsorption sites" patented technology

The invention discloses a special saline and alkaline land organic / inorganic compounded fertilizer as well as a preparation method and application thereof. The compounded fertilizer comprises raw materials, namely a mixture 1 and a mixture 2, wherein the weight ratio of the mixture 1 to the mixture 2 is (1.5-3.5):1; the mixture 1 comprises composite charcoal, a biological organic fertilizer, humicacid substances, furfural residues, an improvement preparation and inorganic nutrients which are mixed according to a certain ratio; the mixture 2 comprises a biological organic fertilizer, humic acid substances, furfural residues and water retention aids which are mixed according to a certain ratio. By adopting the product disclosed by the invention, soil structures can be improved, soil porosity can be improved, soil bulk density can be reduced, contents of organic matters in soil can be increased, the cation exchange amount of the soil can be increased, and the pH value of the soil and thetotal amount of water soluble salts in the soil can be reduced. In addition, the fertilizer has functions of slowly releasing acid substances and nutrients, is capable of activating soil, reducing immobilization of soil upon nutrients and increasing the utilization rate of the nutrients, is capable of continuously and stably improving soil, is free of adverse influence upon environments and plants, and is ecological and environmentally friendly.

The invention belongs to the technical field of agricultural environment conservation and repair, and particularly discloses a conditioner for repairing farmland soil polluted by heavy metals and a preparation method. The processed raw materials such as quick lime, zeolite, sepiolite and calcium magnesium phosphate fertilizer are uniformly mixed proportionally, so as to obtain the conditioner. The conditioner provided by the invention is reasonable in formula, the method is feasible, the operation is simple, and the conditioner integrates the functions of repairing soil with heavy metal pollution, regulating and controlling the soil acidity and alkalinity, and the like, enables the effective state cadmium and lead in polluted farmland to be reduced by 22.4%-31.4% and 26.3%-43.5% respectively, enables the contents of cadmium and lead in rice to be reduced by 33.2%-38.9% and 29.4%-44.6% respectively, the pH of soil to be increased by 0.16-0.27 and the yield of rice to be improved by 3.6%-6.3%, and is applicable to various farmland soil seriously polluted by heavy metals and seriously acidified.

The invention belongs to the field of waste recycling. The invention provides a preparation method of a phosphorous removal adsorbent. The preparation method comprises the following steps: (1) puttingred mud in an acid solution for backflow so as to obtain red mud after acid activation; (2) soaking the red mud after acid activation into a surface active agent, oxidant or sodium carbonate solution, and carrying out modified treatment to obtain modified red mud; (3) mixing the modified red mud with a rare earth solution, adjusting pH value to be 8 to 10, and loading rare earth ions to obtain red mud loaded with rare earth; and (4) carrying out mixing granulation on the red mud loaded with rare earth, a pore forming material and a binder, and carrying out calcinations to obtain the phosphorous removal adsorbent. The removal rate of the phosphorous removal adsorbent prepared in the invention is more than 95% and can reach 100% at most, the adsorption capacity can reach more than 240 mg / g,phosphorous-containing waste water with the concentration of below 30 mg / L is treated, and the concentration of phosphorous can reach the first grade emission standard of pollution discharge standardin a municipal sewage treatment plant within one hour.

The invention discloses a preparation method and application of a magnetic hydrothermal carbon adsorbent. The preparation method of the hydrothermal carbon adsorbent comprises the following steps: (1)preparing a ferric ion solution, wherein a mass ratio of Fe<3+> to Fe<2+> in the ferric ion solution is (1-2):1; and (2) adding hydrothermal carbon into the ferric ion solution prepared in step (1),mixing and stirring, enabling Fe<3+> and Fe<2+> to react under an alkaline condition and generate Fe3O4, loading Fe3O4 on the hydrothermal carbon, and carrying out solid-liquid separation to obtain asolid material which is the magnetic hydrothermal carbon adsorbent. The magnetic hydrothermal carbon adsorbent can be used for removing phosphorus in the water and removing heavy metal ions in the water; adsorption sites on the surface of the hydrothermal carbon are obviously increased through a magnetic activation process on the basis of the hydrothermal carbon, so that adsorbed ions are more strongly combined on the surface of the hydrothermal carbon; the magnetic hydrothermal carbon adsorbent has adsorption performance better than that of ordinary hydrothermal carbon.

The invention provides a magnetic oxidized graphene / polyethyleneimine adsorbent and a preparation method and application thereof. Magnetic L-dopa modified ferroferric oxide nano particles are bonded to polyethyleneimine modified oxidized graphene to obtain the magnetic oxidized graphene / polyethyleneimine adsorbent material. The adsorbent material has multiple adsorption sites and can achieve quickseparation from wastewater under the effect of an applied magnetic field. The preparation raw materials for the adsorbent material are easy to obtain, experiment conditions are mild, a treatment process is simple, and the material has good performance on the aspect of wastewater treatment.

The invention belongs to the technical field of agricultural environmental conservation and restoration, and specifically discloses a farmland soil conditioner and a preparation method thereof. The farmland soil conditioner is prepared by uniformly mixing treated raw materials comprising quicklime, bentonite, zeolite and sepiolite in proportion. According to the invention, the preparation method is easy and simple to operate; the farmland soil conditioner is reasonable in formulation, has functions of restoring heavy metal pollution in soil, regulating soil acidity and alkalinity and the like, enables the contents of available cadmium and lead in polluted farmland to be decreased by 24.1%-35.1% and 28.7%-44.8% respectively, also enables the contents of available cadmium and lead in rice to be decreased by 34.9%-44.7% and 32.3%-46.1% respectively, improves the soil pH by 0.20-0.31, and is applicable to a variety of farmland soils with heavy metal pollution and serious soil acidification.

The invention relates to a method for preparing nano calcium peroxide by chemical modification. The method comprises the following steps: adding a certain amount of dispersing agent into a prepared calcium salt water solution, and mixing under ultrasonic conditions to prepare a bottom solution; slowly and dropwisely adding oxydol with a certain concentration into the continuously stirred bottom solution, reacting in an ice water bath, and continuing the reaction for 15-20 minutes after the dropwise addition is completed; and centrifugating the mixed solution, repeatedly washing the precipitate with deionized water and isopropanol, and drying in a vacuum drying oven for 12-24 hours to obtain the nano calcium peroxide. The method has the advantages of simple technique, mild reaction conditions and short reaction time; the dispersing agent added in the reaction process is nontoxic and harmless, and thus, no pollutant is generated in the production process; and the prepared product has favorable properties, and the particle size of the nano calcium peroxide is 100nm or so. The invention provides a simple effective new way for preparing nano calcium peroxide.

The invention belongs to the technical field of composite materials and in particular relates to a charcoal-based nitrogen-enriched composite material as well as preparation and application thereof. The preparation comprises the following steps: mixing a metallic organic framework material precursor solution with pyrolysis charcoal so as to obtain a mixed liquid; enabling the mixed liquid to reactunder a stirring condition so as to obtain a metallic organic framework material on the surface of the charcoal through in-situ synthesis; and performing solid-liquid separation, namely washing and drying the obtained solid, so as to obtain the charcoal-based nitrogen-enriched composite material. The pyrolysis charcoal is mixed with the metallic organic framework material precursor solution, themetallic organic framework material is prepared on the surface of the charcoal through in-situ synthesis, the charcoal-based nitrogen-enriched composite material is prepared, and the carbon dioxide adsorption effect of the charcoal-based nitrogen-enriched composite material can be improved, so that the technical problems that in the prior art, a carbon dioxide adsorption material is small in specific surface area, low in nitrogen content, poor in carbon dioxide adsorption effect, insufficient in hardness of a metallic organic framework for gas adsorption, insufficient in intermolecular adsorption retention force, and the like, can be solved.

The invention discloses a preparation method of a composite functionalized membrane. The composite functionalized membrane is composited by diatomic doped reduction graphene oxide and a commercial polymer membrane, and is applied to a lithium sulfur battery; the diatomic nitrogen-sulfur doped reduction graphene oxide composite material uses the reduction graphene oxide as a conductive matrix, andthe hetero atoms nitrogen and sulfur adsorb lithium polysulfide through an electrostatic interaction to weaken the "shuttle effect", so as to further coat the diatomic nitrogen-sulfur doped reductiongraphene oxide composite material on the commercial polypropylene membrane to increase the capacity and charge and discharge stability of the lithium-sulfur battery. The nitrogen and sulfur double-doped reduction graphene oxide is obtained by selecting graphene oxide, L-cysteine hydrochloride, ammonia water and deionized water, performing reduction and doping through hydrothermal reaction, performing vacuum filtration, and then performing freeze drying. In addition, the acetylene black / sulfur composite is selected as the positive electrode of the lithium-sulfur battery, and the preparation process is only one step of simple sulfur melt diffusion. The preparation method of the composite functionalized membrane has simple process and low cost, and the lithium sulfur battery shows excellent electrochemical performances.

The invention discloses a preparation method and application of a magnetic hollow graphene-based composite microsphere material. The preparation method comprises the following steps: taking a polymer microsphere with positive charges as a template, and obtaining the magnetic hollow graphene-based composite microsphere material through a high-temperature heat treatment one-step method. The preparation method provided by the invention is simple and feasible and has no environment pollution, and industrial production is easy to realize; meanwhile, the prepared magnetic hollow graphene-based composite microsphere material has a relatively large specific surface area and a developed pore structure, and can be used for efficiently and rapidly adsorbing and separating dye molecules. The magnetic hollow graphene-based composite microsphere material prepared by the preparation method has a wide application prospect in the aspect of treating dye wastewater.

The invention relates to a composite material for efficiently removing phosphorus in wastewater, and a preparation method and an application of the composite material; the composite material is prepared by the steps: taking a mixture of shell wastes and crop straws as a raw material and carrying out high-temperature thermal cracking under an anaerobic condition to obtain a carbonaceous material; adding the carbonaceous material into phosphorus-containing wastewater, adsorbing phosphate, precipitating and separating to obtain a phosphate-loaded carbonaceous material, and then applying the phosphate-loaded carbonaceous material to adsorption and passivation of heavy metals in contaminated soil. The shell and straw waste resources are fully utilized, mixture thermal cracking carbon with a better phosphorus adsorption effect than that of single thermal cracking or simple compounding of all the raw materials is obtained after high-temperature thermal cracking, the phosphorus-rich carbon material obtained through recovery can be used as a heavy metal contaminated soil conditioner, and the preparation process is green, environmentally friendly and free of pollution.

The invention discloses a small-size graphene positive electrode material for a lithium-sulfur battery, the lithium-sulfur battery prepared by the small-size graphene positive electrode material and apreparation method and belongs to the field of battery materials. The preparation method comprises the steps of preparing small-size graphene through electrolyzing microcrystalline graphite powder; compounding the small-size graphene or surface-modified small-size graphene, such as the small-size graphene-modified by sodium carboxymethyl cellulose, sulfate, silicate, metal ions, a metal oxide, anon-metallic element or a high polymer material and sulfur at the mass ratio of 2:(1-9) to prepare the positive electrode material for the lithium-sulfur battery; and then preparing the lithium-sulfurbattery by adopting metal lithium as a negative electrode. The prepared lithium-sulfur battery is a real sense of graphene lithium-sulfur battery, the graphene is only used as an additive in the other lithium-sulfur batteries, and the prepared lithium-sulfur battery is fundamentally different from the other lithium-sulfur batteries. The positive electrode material for the lithium-sulfur battery is high in specific capacity, good in cycle performance, high in security, high in conductivity and low in cost, and has a very broad market prospect.

The invention relates to a preparation method of a novel 3D graphene aerogel based efficient adsorbent. The method is characterized in that a graphene oxide aqueous solution and tetraethylenepentamineare uniformly mixed, the mixture is placed in a high-temperature and high-pressure reactor, a hydrothermal reaction is performed, aminated graphene hydrogel is prepared and processed with a freeze drying technique, and aminated graphene aerogel is obtained. The aerogel adsorbent is prepared with a one-step hydrothermal method, operation is simple, cost is lower, and the prepared aerogel is of a 3D porous and reticulated structure, is quite low in density, has huge specific surface area and shows excellent adsorption effect when used for adsorbing Cr (IV), and the adsorption capacity is as high as 361.48 mg / g.

The invention relates to crosslinked graphene oxide aerogel for wastewater treatment and a preparation method of the crosslinked graphene oxide aerogel. According to the technical scheme, graphene oxide is prepared from flaky graphite with a chemical oxidation method (Hummers method), then epoxy groups are introduced into graphene oxide, amino-containing substances are introduced into graphene oxide, graphene oxide is crosslinked, sizing and drying treatment are performed finally, and the crosslinked graphene oxide aerogel is prepared. The preparation method is simple, the process is simple and convenient, the adopted raw materials are cheap and widely sourced, and the prepared aerogel has good economical efficiency; by introducing amino groups, adsorption sites can be increased, adsorption efficiency of an adsorbent can be improved, the adsorbent is easy to remove from a wastewater system, secondary pollution to water is avoided, and the crosslinked graphene oxide aerogel has great application prospect.

The invention discloses a preparation method of organic modification biochar for treating heavy metal cadmium in wastewater. The preparation method comprises: (a) preparation of wheat straw biochar: carrying out air-drying on wheat straw, crushing, sieving, carbonizing the crushed wheat straw, naturally cooling to a room temperature after the carbonization, washing with an acid, filtering, washingwith distilled water to achieve a neutral state, and drying to achieve a constant weight to obtain wheat straw biochar; and (b) preparation of organic modification biochar: soaking the wheat straw biochar prepared in the step (a) in a chitosan solution, performing ultrasonic wave treatment after mixing and stirring, adding the chitosan-biochar suspension into an alkaline solution in a dropwise manner by using an injector, standing, filtering, washing with distilled water to achieve a neutral state, and drying to achieve constant weight so as to obtain the organic modification biochar. According to the present invention, by using organic modification, the advantages of two adsorbents of chitosan and biochar are combined, such that the adsorption efficiency of the biochar on cadmium in wastewater is greatly improved.

The invention discloses a phosphorus-doped cerium titanium catalyst as well as a preparation method and the application thereof to selective catalytic reduction denitrification. The preparation methodcomprises the following steps: firstly dissolving titanium sulfate and a phosphate precursor in water, adding an alkaline precipitant, regulating the pH value to be more than or equal to 10, fully reacting and then washing, drying and calcining to obtain a phosphorus-doped TiO2 carrier; then dissolving the cerium nitrate and the phosphorus-doped TiO2 carrier in the water, stirring, reacting, thendrying and calcining to obtain the phosphorus-doped cerium titanium catalyst. The phosphorus-doped cerium titanium catalyst disclosed by the invention has a typical mesoporous structure, can effectively improve the absorption and the activation of NH3 on the carrier, simultaneously inhibits the oxidability of the CeO2 in an active matter and shows good catalytic reduction and denitrification ability, high N2 selectivity and sulfur resistance.

The invention discloses magnetic meso-porous silicon. A preparation method of the magnetic meso-porous silicon comprises the steps of reacting by taking tetraethoxysilane as a silicon source, ammonium ferrous sulfate as an iron source and an F-127 block polymer as a template, separating to obtain a meso-porous compound, adding an oxidant, reacting, filtering, drying and firing to obtain the magnetic meso-porous silicon which is even in magnetic distribution. The invention also provides a magnetic meso-porous silicon adsorbent. A preparation method of the magnetic meso-porous silicon adsorbent comprises the steps of performing polymeric oxidizing reaction through the magnetic meso-porous silicon, ammonium persulfate and phenylamine under an acid condition, then washing, filtering and drying to obtain the magnetic meso-porous silicon adsorbent; and the preparation method is simple and saves the reaction time. The invention also provides an application of the magnetic meso-porous silicon adsorbent in removal of heavy metal ions in water; and the magnetic meso-porous silicon adsorbent is strong in adsorption force of heavy metals and large in adsorption capacity.

The invention discloses a preparation method and application of a polyvinylamine functional magnetic carbon-based nano adsorbing agent. The preparation method is specifically characterized in that a chemical coprecipitation method is used to deposit magnetic particles to the surface of graphene oxide-carbon nanotubes, and amidation is used to modify high-cation polyvinylamine (PVAm) to the magnetic (graphene oxide-carbon nanotubes) hybrid body. The prepared adsorbing agent has the advantages that the adsorbing agent has large specific surface area and rich adsorption sites, has a large numberof amino functional groups and can effectively combine with phenol through a hydrophobic effect, pi-pi keys, electrostatic attraction and hydrogen bonding so as to effectively remove phenol in wastewater, and the maximum phenol adsorption quantity, calculated through a Langmuir model, of the adsorbing agent is 224.21mg / g; the adsorbing agent can be reused through simple enrichment desorption, andindustrial wastewater treatment cost is lowered.

The invention discloses a method for removing lead in a water body by using magnetic pig manure biochar. The method comprises the steps as follows: magnetic pig manure biochar is added to the lead-containing water body, the pH value of the water body is controlled between 2 and 7, and constant-temperature vibrating treatment is performed to adsorb lead in the water body. The magnetic pig manure biochar is prepared in the following steps: (1) pretreated pig manure is subjected to high-temperature pyrolysis in nitrogen and pig manure biochar is obtained; (2) a pig manure biochar dispersion liquid is prepared, a ferric iron salt solution and a ferrous iron salt solution are mixed and stirred, and an iron salt mixed solution is prepared; (3) the pig manure biochar dispersion liquid and the iron salt mixed solution are mixed and stirred, the pH value is adjusted, boiling, filtration, washing and drying are performed, and the magnetic pig manure biochar is obtained. The method has the advantages of being simple to operate, low in cost, capable of quickly and efficiently adsorbing lead, easy in separation and recovery, reusable, environmentally friendly and the like.

The invention discloses a dendritic high-density solid amine fiber material and a preparation method therefor. The structural formula of the dendritic high-density solid amine fiber material is shown as formula (I); and in the formula (I) as shown in the specification, R1 is NH2 or OH, R2 is (CH2CH2NH)n, n is equal to 0, 1, 2, 3, and R3 is H or CH3. Organic fibers and natural fibers are used as matrix fibers, the matrix fibers pretreated by alkali liquor are radiated by using gamma rays of cobalt-60, and a Michael addition and amide substitution reaction is performed for chemical modification through graft acrylic acid monomers, amination substitution reaction, amino and unsaturated monomers so as to prepare the dendritic high-density solid amine fiber material. The fiber material is high in amido density, good in heat stability and chemical stability and high in adsorption capacity of acid gas, and can be regenerated through thermal desorption recycle; moreover, the fiber material has an antibacterial action, and has wide application prospects in the fields of environmental management, medical materials, functional garment materials and the like.

The invention discloses a preparation method and an application of a two-dimensional crystal MXene nanomaterial, and relates to the technical field of novel energy storage. The preparation method comprises the following steps: crushing and sieving a ternary layered ceramic MAX phase material to obtain an MAX phase ceramic powder; and immersing the MAX phase ceramic powder in a mixed solution composed of a fluorine salt and an inorganic acid, stirring and reacting the obtained solution, and centrifuging, washing and drying the obtained reaction product to obtain the two-dimensional crystal MXene nanomaterial. The method has the advantages of simple process, low cost, no special process device, convenience, high efficiency and good safety, and the MXene nanomaterial can be used as an electrode material of a lithium battery to improve the cyclic structural stability of the material and improve the specific capacity and the cycle life, and is an excellent lithium battery electrode material.

The invention belongs to the field of lithium ion battery material preparation, and in particular relates to a preparation method of a carbon nanotube modified lithium-rich manganese-based positive electrode material xLi2MnO3. (1-x) LiMO2. According to the preparation method, a precursor and a carbon nanotube are modified at the same time in a pre-oxidation mode; a conductive network combination of the carbon nanotube and the positive electrode material can be formed; and the conductivity of the prepared material is improved. The preparation method comprises the steps of uniformly mixing a transition metal salt solution according to a stoichiometric ratio, dropwise adding a precipitant and a complexing agent, washing and drying to obtain a precursor, stirring, dispersing and drying the precursor and a carbon nanotube aqueous dispersion, adding into an oxidant solution for pre-oxidation, drying, mixing with a lithium source, calcining and cooling to obtain a final product. The lithium-rich manganese-based material disclosed by the invention not only has high specific capacity, but also has excellent rate capability and cycle performance. A lithium ion battery adopting the positive electrode material has huge application potential in the aspect of power batteries.

The invention relates to the field of groundwater pollution remediation, in particular to a porous permeable geopolymer material and a preparation method and application thereof. According to the geopolymer material, mineral powder and solid waste are subjected to a geopolymerization reaction under excitation of a sodium silicate exciting agent to form a porous matrix, the through hole rate and the specific surface area of the material are improved by applying the saponification reaction characteristic of animal and vegetable oil, a self-degradable material is embedded in the porous matrix, and the self-degradable material is degraded along with time and releases internal active substances. The preparation method of the porous permeable geopolymer material comprises the following steps: taking a geopolymer prepared from a high-activity silicon-aluminum natural mineral or solid waste or a mixture of the high-activity silicon-aluminum natural mineral and the solid waste as a raw material under the action of an exciting agent as a matrix material, adding a pore-forming agent to form pores in the matrix, embedding the self-degradable particles, and conducting curing to obtain the porous permeable geopolymer material. The problems that in the prior art, an underground water permeable reactive barrier needs to be constructed in a filling mode, reactive barrier engineering is complex, and the construction period is long, so that the early-stage investment is large, and the defect that the permeability coefficient of a conventional permeable reactive barrier is gradually reduced along with the increase of the service life is overcome.

The invention belongs to the technical fields of the preparation and separation of materials, relates to the preparation of lithium / rubidium ion double-adsorption materials and particularly relates toa preparation method and application of an imprinted porous adsorption lithium / rubidium ion material. The preparation method comprises the steps of firstly carrying out hydroxylation on a carbon nano-tube, and reacting by virtue of triethoxy linked with silicon in 3-glycidoxypropyltrimethoxysilane KH560 and hydroxy on the carbon nano-tube, so as to introduce epoxy groups; and carrying out open loop compounding with phenolic hydroxyl group of imprinted p-tert-butyl[4]arene IC4A, so as to obtain the imprinted porous adsorption material. By combining the complexing effect of p-tert-butyl[4]areneand an ion imprinting technique, the effective selective double absorption of lithium / rubidium ions can be realized. The invention further discloses application of the prepared material in the adsorption of lithium ions and rubidium irons in salt lake brine. The method is relatively simple in operation, and the prepared imprinted porous adsorption material is stable in structure and has a relatively large specific surface area; and in combination with the ion imprinting technique, the adsorption sites of the material can be increased, and the adsorption performance of the material can be improved.

The invention relates to a nano titanium dioxide modification method of an electric adsorption desalinization carbon electrode, belonging to the field of manufacturing of main electrode components of an electric adsorption water purifier. The method comprises the following steps: pretreating a formed electrode, immersing in a nano titanium dioxide sol for some time, taking out, drying at a certain temperature, and carrying out heat treatment to form a titanium dioxide film layer on the wall surface of the interior pore canal of the electrode, thereby obtaining the modified electrode. The modified electrode can not easily generate acid or alkali in the electric adsorption desalinization process, has the advantages of high electric adsorption rate and higher specific surface utilization efficiency, and enhances the electric adsorption capacity of the carbon electrode, so that the desalinization property of the electrode is sufficiently displayed.

A preparing method of a metal-based polyvinylpyrrolidone ionic liquid-grafted attapulgite clay composite flocculating agent and applications of the composite flocculating agent are disclosed. The method includes performing in-situ polymerization under actions of an initiator by adopting a functionalized vinylpyrrolidone ionic liquid grafted to the surface of attapulgite clay as a monomer and adopting N,N'-methylenebisacrylamide as a crosslinking agent to produce the metal-based polyvinylpyrrolidone ionic liquid-grafted attapulgite clay composite flocculating agent, and the composite flocculating agent is used for sewage treatment. The preparing method and the applications are advantageous in that the method is simple, raw materials are cheap and easily available, a production process is simple, and the ionic liquid and the attapulgite clay are connected through covalent bonds so that bonding is firm and loss is difficult, the composite flocculating agent is a composite flocculating material with strong functions and is used for domestic sewage treatment, the COD removal rate is 85-98% and the turbidity removing rate is 85-95%.

The invention provides a method of modifying magnetic chitosan with ethylenediamine and an application of diclofenac in wastewater treatment and belongs to the technical field of material preparationand water environmental protection. The method of modifying the magnetic chitosan with the ethylenediamine is characterized in that an one-step precipitation method is adopted to allow pellets to slowly drop into an alkaline solution and form spherical adsorbents, so that separation and precipitation are easy, and secondary pollution to water bodies is avoided, and the method is simple in operation and mild in reaction conditions; magnetic separation technology is adopted to organically combine ferroferric oxide with chitosan molecules, so that synthesized adsorbent pellets are made to be magnetic and can be quickly and efficiently separated from wastewater under the action of an external magnetic field. Furthermore, the method of modifying the magnetic chitosan with the ethylenediamine has the advantages of being capable of increasing the chemical stability of the chitosan by crosslinking with glutaraldehyde, increasing adsorption sites of contaminants with the number of amino groupson the chitosan molecules increased after the modification with the ethylenediamine, and thus enhancing adsorption capacity of the diclofenac.

The invention discloses crosslinked polystyrene-polypropenyl hydroximic acid inter-penetrating network resin and a preparation method and application thereof. The resin is formed by polypropenyl hydroxamic acid or polypropenyl hydroxamic acid with a rare earth metal ionic imprint penetrating through spherical crosslinked polystyrene macroporous resin holes. The preparation method comprises the following steps: firstly preparing the spherical crosslinked polystyrene macroporous resin; then preparing the polypropenyl hydroxamic acid or polypropenyl hydroxamic acid with the rare earth metal ionic imprint in the spherical crosslinked polystyrene macroporous resin holes by virtue of an in-situ polymerization method to form a double network inter-penetrating polymer network structure. The preparation method of the crosslinked polystyrene-polypropenyl hydroximic acid inter-penetrating network resin disclosed by the invention has the advantages of being simple to operate, short in production period, low in production cost, high in reaction yield and the like. The prepared resin can be used for separating rare earth metal ions enriched in a solution and can be particularly used for efficiently and selectively separating target rare earth metal ions in the mixed rare earth metal ion solution.

The invention relates to an amidoxime-group-modified cyclodextrin / sodium alginate gel ball composite adsorption material which is prepared by combining amidoximated diaminomaleonitrile with an oxygen-containing functional group of sodium alginate and an oxygen-containing functional group of cyclodextrin, so that on the one hand, amidoxime groups are introduced, adsorption sites in gel are increased, and selective adsorption capacity of composite material to hexavalent uranium is greatly enhanced; on the other hand, the sodium alginate and the cyclodextrin enhance the mechanical properties of the material and obtain stronger mechanical properties, so that the material has good mechanical properties, can be repeatedly used for multiple times, is easy to separate from water, and adsorption sites in the composite aerogel are also increased; the composite adsorption material is used for enriching hexavalent uranium, is high in enrichment rate and short in adsorption time, is not influencedby seawater salinity, can be repeatedly used, is easily separated from a water body, and is easy to recover and recycle.

The invention provides an iron-based soil remediation agent and a preparation method thereof. The iron-based soil remediation agent is prepared by uniformly spraying a Rujin bacterium stock solution on a mixture of biogas residues, straw powder and pig manure mixed with oxalic acid, then compacting, stacking, sealing and fermenting to obtain odorless biogas residues, then mixing a ferric salt, a calcium salt and biochar, drying, and then extruding and crushing an obtained product with the odorless biogas residues, polyacrylic acid and manganese dioxide through a screw. The iron-based soil remediation agent provided by the invention has good adsorption performance; in addition, arsenic in the soil can be converted into Fe-As and Ca-As complexes; meanwhile, abundant organic humus is contained, arsenic adsorbed by the arsenic complex and the soil can be converted into effective-state arsenic, the arsenic content in the soil is effectively reduced, the remediation effect on the arsenic-contaminated soil is good, the preparation process is simple, the cost is low, the raw materials are renewable, and the method has the advantages of being good in environment friendliness and the like.