187results about How to "Increased redox potential" patented technology

The invention belongs to the field of rice cultivation, and particularly relates to a cultivation method suitable for no-tillage rice in a fixed compartment of an oil crop-medium rice field. The cultivation method comprises the following steps that: (1) rice seeds are coated by using dry-raised nurse, thick mud and dry fine soil serving as coating agents, wherein the components comprise 7.9 to 12.5 percent of dry-raised nurse, 25 to 26.3 percent of rice seeds, 12.5 to 13.2 percent of thick mud with 37 percent of water content and 50 to 52.6 percent of dry fine soil with 3 percent of water content in percentage by mass; the rice field is finished as required and the soil moisture is kept; and keeping the seedling age at 15 to 18 days; (2) the compartment width of the oil crop field is 1.2 meters, the width of the ditch is 0.3 meter, and the depth of the ditch is 0.25 meter; the rape seedlings are applied to the field; a ternary compound fertilizer of which pure nutrients comprise 15 percent of N, 15 percent of P2O5 and 15 percent of K2O is applied, and 30 kilograms of pure nitrogen is applied in each mu; 5.80 kilograms of zinc is applied in each mu; and 4.8 kilograms of boron fertilizer is applied in each mu, and the ditch is kept full of water; (3) rice seedlings with 50 to 100 grams of soil in each seedling in 15 to 18 days are directionally thrown according to a row space of 20 centimeters; and (4) the ditch is kept with water and the compartment surface has no water after throwing the seedlings till the heading stage, and dry and wet alternated cultivation is adopted from the grain filling stage to the maturation stage. Compared with the conventional method, the yield is averagely increased by 8.7 percent.

The invention discloses a comprehensive technology for the ecological restoration of low-pollution river water. The technology constructs the low-pollution river water environment comprehensive control engineering treating flowing water as a base, treating ecological restoration as a core and giving consideration to the landscape improvement through the integration and optimization of ecologic restoration combination techniques comprising a water power control technique, a polluted basement restoration technique, an underwater microtopography shaping technique, an aquatic plant recovery technique, an aquatic animal restoration technique, an aquatic life reinforcement technique, a water landscape construction technique and the like. The comprehensive technology has a good pollutant removal performance, and the TN, NH3-N and TP reductions reach 75.5%, 84.5% and 92.0% respectively.

The invention discloses a rechargeable magnesium battery taking oxygen-containing organic matter as a cathode material, and a preparation method of the rechargeable magnesium battery, wherein the oxygen-containing organic matter comprises the components of quinones, phenols, anhydrides derivatives and a compound containing nitro and oxygen radical. The battery and the method have the advantages of being simple in preparation technology, easy to process, environment-friendly and high in regeneration. The rechargeable magnesium battery prepared by the invention has the advantages of being relatively good in structural stability and circulation stability, rich in raw materials, safe in system and the like.

The invention relates to a soilless seedling culturing substrate for resisting diseases and root nematode of plants and a production method thereof. In the invention, organic wastes such as straws are taken as raw materials, inoculated with zymogen according to certain proportion, subjected to moisture content regulation, evenly mixed and stacked for primary fermentation; when the temperature of a pile reaches 60 DEG C, the pile is turned; the pile is turned and oxygen and moisture content are supplemented every seven to ten days afterwards; after the pile is turned for three times, when the temperature is lower than 35 DEG C, the pile is inoculated with a bio-antagonist for secondary fermentation, turned every three to four days and kept at a temperature of between 35 and 40 DEG C; and after 15 to 20 days, the seedling culturing substrate containing the 10 bio-antagonist is obtained. The seedling culturing substrate has chemiotaxis for interfering pathogenicbacteria and nematode, can reduce infestation chance of the pathogenicbacteria and nematode on the root surface, and has double effects of resisting phytophthora disease and root nematode disease through the secondary fermentation and microorganism activation technology.

The invention discloses a nitrate slow-release material and a preparation method thereof. The nitrate slow-release material is prepared from the following raw materials, by mass, 45.5-62.5% of cement, 23.7-33.2% of water, 4.3-15.8% of a nitrate and 0-15% of clay mineral powder. The preparation method comprises the following steps: dissolving the nitrate into the water to obtain a nitrate solution; uniformly mixing the cement and the clay mineral powder to obtain a mixture; adding the resulting mixture to the nitrate solution, followed by carrying out concrete curing; crushing the cured material into the particles having a particle size of 3-10 mm to obtain the nitrate slow-release material. The nitrate slow-release material provided by the present invention has characteristics of slow releasing process, good slow-release effect, and easy adding way. In addition, the small amount of the nitrate slow-release material is added to the water body during using, the effect of the nitrate slow-release material can be generated for a long time after the nitrate slow-release material enters the sediment, the released nitrate from the nitrate slow-release material can be adopted as the bacterial to oxidize the electron acceptor of the organic contaminant, raise the oxidation-reduction potential of the sediment, inhibit releasing of sulfur and phosphorus, and has phosphorus adsorption effect so as to reduce the amount of the phosphorus released by the sediment. The nitrate slow-release material can be used in treating contaminated sediment in the river on a large scale.

The invention belongs to the field of new-energy batteries, and particularly relates to a Prussian white analog cathode material and a preparation method and application thereof. The preparation method of the Prussian white analog cathode material comprises the following steps: (1), acquiring an aqueous solution of K4Fe (CN)6, which is recorded as a solution A; (2), acquiring a mixed aqueous solution of a transition metal salt of Mn and potassium citrate, which is recorded as a solution B; and (3), dropwise adding the solution A into the solution B, continuing heating and stirring after completion of dropwise addition, aging for several hours, performing solid-liquid separation, collecting and washing a precipitate, and drying to obtain the Prussian white analog cathode material. The Prussian white analog cathode material adopts an open three-dimensional network frame structure, has a large gap position, and can guarantee free deintercalation of various ions such as Li<+>, Na<+> and K<+>.

The invention relates to a method for removing heavy metal from sludge. The method comprises the following steps of: extracting the heavy metal by using citric acid and hydrogen peroxide, performing microwave heating and solid-liquid separation, and adding sodium hydroxide to precipitate the heavy metal. The method is simple in process, the removal rate of the heavy metal is high, and consumption of acid is low; the citric acid solution can be recycled; the method is low in cost and does not harm the environment; and by adding the hydrogen peroxide into the extract, the extraction rate is improved, the reaction is quickened, and loss of available chemical elements such as N and P is reduced.

The invention discloses a hyper-gravity device for enhancing a reaction by gas-liquid efficient premixing and an application method thereof. The hyper-gravity device comprises a motor, a main shaft, arotor, a shell, a liquid distributor, a secondary shaft, a speed-increasing gear, a speed-increasing gear output shaft and a charging cavity, wherein the main shaft at an output end of the motor passes through the bottom of the shell and extends into the shell; the rotor is fixed on an upper part of the main shaft; the charging cavity is arranged on an upper part of the shell; a lower part of thecharging cavity is connected with the liquid distributor; the main shaft is fixedly connected with the speed-increasing gear through the secondary shaft; the output shaft of the speed-increasing gearpasses through the bottom of the charging cavity and extends into the charging cavity; stirring wings are arranged on a part of the output shaft of the speed-increasing gear in the charging cavity. By adopting the hyper-gravity device, gas is distributed in a liquid phase in a nano-micron size, long gas retention period and high gas-liquid mass transfer efficiency are achieved, and the macro-reaction rate is increased effectively.

The invention discloses a method for preparing mineral organic fertilizer by using surplus sludge in municipal sewage plants. The method mainly comprises the following three steps: firstly reducing sludge in a sludge thickening tank, dehydrating the reduced sludge by adopting a catalytic ozonation method, carrying out subcritical water reaction on the dehydrated sludge, and discharging solids subjected to harmless treatment; finally mixing modified attapulgite clay with the sludge subjected to harmless treatment, chicken manure and microorganism beneficial microbial agents, and fermenting the mixture to obtain the mineral ecological organic fertilizer. The method is green and environment-friendly and realizes the harmless and resourceful treatment of the sludge; the obtained mineral organic fertilizer is capable of obviously improving the structure of soil, enabling the volume-weight of soil to be reduced, the holes of soil to be increased and the ventilation and water permeability of the soil to become good and adjusting the uniform growth of crops and has a good controlled release effect, thus the quality of the crops is improved.

The invention discloses a method for degrading tetracycline, and belongs to the technical field of organic wastewater treatment. According to the method, a nitrogen-doped carbon quantum dot-carbon nitride metal-free catalyst is adopted to activate persulfate under visible light to degrade tetracycline. According to the nitrogen-doped carbon quantum dot-carbon nitride metal-free catalyst, carbon nitride is taken as a carrier, and the carbon nitride is modified with nitrogen-doped carbon quantum dots. The metal-free catalyst disclosed by the invention has the advantages of strong light absorption capability, high photo-induced electron-hole separation efficiency, high catalytic activity, strong oxidation-reduction capability and the like. The catalyst is used for activating persulfate to degrade antibiotic wastewater under visible light, can catalyze persulfate to efficiently generate strong oxidizing free radicals, has the advantages of high degradation efficiency, good reusability, nosecondary pollution and wide application range, and has a very good practical application prospect.

The invention relates to a method for removing oxytetracycline in biological medicine waste residues. The steps of pretreatment, catalytic oxydative degradation, bacterium inactivation, neutralizing treatment and the like are adopted, and an organic matter waste residue product containing no oxytetracycline can be formed after drying and can be used for preparing subsequent soil conditioners and organic and inorganic compound fertilizer. Compared with the prior art, purchase, use and management are easy, and hydrogen peroxide is convenient to use; and the method is used for treating the biological medicine waste residues, the oxytetracycline waste residue cost is low, the treatment process is fast, environment-friendly and small in harm, finally, the biological medicine waste residues are used as raw materials of the organic fertilizer or the soil conditioners, and the utilization value is high.

The invention discloses compound biochar-based slow-release fertilizer and an application method thereof and mainly relates to the field of biochar-based fertilizer. A preparation method of the compound bio-carbon-based slow-release fertilizer comprises mixing agricultural rice straws and wood shavings, preparing char, adding sodium selenite into the char to obtain biochar, mixing pig manure and chicken manure, carrying out fermentation on the pig manure and chicken manure, carrying out metal passivation treatment to obtain manure-based fertilizer, further fermenting the biochar and the manure-based fertilizer, and adding diatomite into the fermentation product for modification to obtain slow release fertilizer granules. In use, preferably, the slow-release fertilizer granules are applied to the field according to a ratio of 256 kg per mu, and a field moisture capacity measured value is kept in a range of 70% to 80% in the whole growth period. The compound biochar-based slow-release fertilizer can meet the demand of nitrogen and phosphorus in the early stage and the whole period of rice seedling, has sufficient and lasting fertilizer effects, prevents the effects of heavy metals, improves the soil environment, inhibits methylmercury, and can produce high-yield good-quality selenium-rich rice.

The invention discloses a black and odorous water bottom mud in-situ remediation material and a preparation method thereof. The material is prepared from an oxygen release agent, an ammonia-nitrogen oxidant, aggregates, a binder, a pH regulator and a solidification regulator. The black and odorous water bottom mud in-situ reduction and solidification function material is prepared from the following steps that all raw materials are mixed to be uniform, granulation is conducted, or a mold is filled with chemicals, maintenance is conducted, and after the maintenance period is finished, the material can be obtained. Accordingly, the applied materials are easy to obtain and friendly to environment, preparation is easy, and the cost is low; meanwhile, oxygen slowly released from the chemicals and hypochlorite ions can improve the redox potential of black and odorous water, ammonia and nitrogen can be oxidized, sulfur release is inhibited, and remediation can be provided for the black and odorous water efficiently and enduringly.

The invention provides a method for treating organic wastewater by use of ferric oxychloride to catalyze and activate mono-persulfate. The method comprises the following steps: adding ferric oxychloride FeOCl in the organic wastewater, carrying out adsorption reaction to obtain a mixture; and adding mono-persulfate in the mixture, wherein the mono-persulfate is catalyzed and activated by ferric oxychloride to produce free sulfate radical so as to degrade the organic wastewater. Mono-persulfate is used as an oxidizing agent, and a ferric oxychloride catalyst is used for catalyzing and activating mono-persulfate, and then treating the organic wastewater, the effect of degrading the pollutants in the organic wastewater is obvious, the defects that the hydroxyl free radical has high environment requirement and needs to oxidize the pollutants under the acidic condition in the prior art are solved. The organic pollutant degradation efficiency of the method disclosed by the invention in the wastewater is high under the acidic condition, the neutral condition and the alkaline condition.

The present invention relates to bacteriostat, and is one kind of bacteriostatic haydite and its making process. The bacteriostatic haydite is made with carrier, molybdenate, silver salt, copper salt, nanometer zinc oxide, sludge powder of 0.05-0.08 mm, pore forming agent, adhesive and glaze forming agent. Its making process includes the following steps: 1. adding the carrier into deionized water and regulating pH value; 2. adding molybdenate, silver salt, copper salt, nanometer zinc oxide and dispersant through lucifugous stirring; 3. decompression filtering to separate, washing with deionized water, and stoving; 4. adding sludge powder, pore forming agent, adhesive and glaze forming agent, and grinding after adding deionized water; 5. forming and naturally drying; and 6. calcining. The bacteriostatic haydite with carrier of tourmaline, zeolite and shale has high molybdenum carrying amount and high bacteriostatic effect.

The invention relates to the field of black and odorous water body remediation, in particular to a sediment improving material for a black and odorous water body and a use method, and aims to providea sediment improving material capable of fundamentally eliminating black and odorous phenomena of the water body for the black and odorous water body. The sediment improving material is prepared from1-30 parts by weight of a sediment improving material A and 0.5-10 parts by weight of a sediment improving material B, wherein the sediment improving material A comprises iron powder, carbon powder, aluminium oxide, natural minerals and / or silica; the sediment improving material B comprises calcium nitrate, calcium peroxide and / or chitosan.

The invention discloses a treatment method of high concentration organophosphorus wastewater. The total phosphorus content of the high concentration organophosphorus wastewater is in a range of 30 to 150 mg / L. The method uses a flocculation-microwave activated carbon activated potassium persulfate combined method. Through compound aluminum-iron-modified starch enhanced flocculation, microwave activated carbon activated potassium sulfate catalytic oxidation and calcium oxide precipitation treatment, chemical oxygen demand (COD) and total phosphorus content (TP) of high concentration organophosphorus wastewater are fast reduced. The method solves the problem that the traditional Fenton oxidation method has a low H2O2 utilization rate, a narrow pH application range, a large iron mud amount and large wastewater chroma. The method has the advantages of high efficiency, implementation easiness, no secondary pollution and good removal effect.

The invention discloses an in-situ cleaning and reusing device for black and odorous river sediments, and a method thereof. The device comprises a submersible pump, the outlet of the submersible pumpis connected with the inlet of an oxidation reaction tank through a dosing pump, the outlet of the oxidation reaction tank is connected with the inlet of a vibrating screening machine, the coarse particle outlet of the vibrating screening machine is connected with the inlet of a coarse particle collecting tank, the mud outlet of the vibrating screening machine is connected with the inlet of a mudtank, the outlet of the mud tank is connected with the inlet of a cyclone separator through a lifting pump and a valve, the medium particle outlet of the cyclone separator is connected with the inletof a medium particle collection tank, the wastewater outlet of the cyclone separator is connected with the inlet of a flocculation reaction tank, the outlet of the flocculation reaction tank is connected with the inlet of a microfiltration machine, and the device treats areas of a river, formed through division using cofferdams, through water distribution pipelines. The method is characterized inthat reduced pollutants in the sediment are removed through the oxidation effect, the cleaned sediments are screened according to different particle sizes, and are respectively covered in the river channel, and wastewater is treated and reused, so the subsequent treatment and disposal cost of the sediments is reduced.

The invention discloses a method of removing sulfanilamide antibacterials and a COD (chemical oxygen demand) from livestock breeding waste water by using micron zero-valent ferrum-activated persulfate. The method comprises the steps of adding 0.007-0.008mol / L persulfate and 0.2-0.3g / L micron zero-valent ferrum, uniformly stirring, and keeping pH (potential of hydrogen) of a reaction system to be 4.5-5.5 for reaction, wherein a mole ratio of micron zero-valent ferrum to persulfate is 1:(1.40-2.10). The method overcomes the disadvantages of a too high reaction rate, a low utilization ratio and the like of a metal ion catalyst, can quickly, efficiently and persistently remove the sulfanilamide antibacterials and the waste water COD from the livestock breeding waste water; reaction conditions are mild; the treatment time is greatly shortened; the technical cost is lowered; and the method has wide application prospects in degradation and removal of the sulfanilamides antibacterials and the COD in the livestock breeding waste water.

The invention relates to the field of environmental protection, in particular to an in-situ soil and underground water integrated remediation system and remediation method. The system comprises an extraction-injection system, an ozone generation system, a wastewater treatment system, a waste gas treatment system and a hydrogen peroxide configuration system. The extraction-injection system, the ozone generation system, the wastewater treatment system, the waste gas treatment system and the hydrogen peroxide configuration system are connected through corresponding pipelines and are equipped withcorresponding liquid flow meters and gas flow meters. According to the method, through combination with the advantages of extraction-treatment, extraction-injection integration, an underwater circulating well, gas-liquid pollutant treatment, ozone-hydrogen peroxide combined oxidation and in-situ oxidation, polluted underground water is extracted and then is subjected to oxidation treatment through ozone and hydrogen peroxide; and then the treated water containing the ozone and hydrogen peroxide is injected underground to conduct in-situ oxidation remediation. By means of the method, organic polluted soil and underwater can be restored simultaneously. Moreover, the remediation range is wide, the remediation period is short, the cost is low, and operation is convenient.

The invention discloses a method for rapid determination of hydrogen peroxide content of a solution. Hydrogen peroxide is excited by ferrous iron ion, a tracer agent of p-phenylenediamine of N, N-diethyl is employed, by the test of the absorbance after the reaction of the standard sample of concentration gradient, a criterion curve and a linear regression equation of the hydrogen peroxide concentration relative to the absorbance are obtained by fitting, and the relevant hydrogen peroxide content is obtained by testing of the absorbance after the same reaction of samples by rapid determination, the method is simple in operation, accurate and sensitive, green and environmentally friendly, economical and practical, and the hydrogen peroxide content in the samples is testable rapidly in the laboratory and in-situ by the use of UV-visible spectrophotometer only. The method is widely applicable in environmental protection, chemical and medical industries, and in rapid and accurate detections of residual hydrogen peroxide content on a variety of samples by the treatment of oxidation, bleach or disinfection.

The invention belongs to the technical field of organic wastewater treatment, and relates to a method for catalyzing a monopersulfate to generate sulfate radicals to decompose an organic matter. The method comprises the following steps: performing ultrasonic dissolution on Co(NO3)2.6H2O, Cu(NO3)2.3H2O and an SBA-15 molecular sieve, placing the dissolved material into a tubular furnace, performingroasting, performing drying, performing grinding to obtain a Cu0.7Co2.24O4 / SBA-15 catalyst, performing activation on the monopersulfate by utilizing the Cu0.7Co2.24O4 / SBA-15 catalyst, and performing degradation on a sulfapyridine solution. According to the method disclosed by the invention, Cu0.7Co2.24O4 in the catalyst is uniformly attached to the pores or surface of the SBA-15, so that stabilityof the catalyst in the reaction system can be effectively enhanced, and sites of the reaction of the monopersulfate and the catalyst are improved; and a high specific surface area of the SBA-15 effectively improves a speed of activation of the sulfate radicals, the reaction is faster, a utilization rate of the reactants is effectively improved, and the degradation efficiency is greatly improved.

The invention discloses a method and a device for repairing a black and smelly water body in situ by utilizing a microbial fuel cell and aquatic plants. The method comprises the following steps: A, embedding a positive plate under a black and smelly water body-water interface; B, enabling root systems of the aquatic plants to penetrate through round holes formed in the positive plate; C, setting negative plates on a water-air interface, enabling the positive plates to suspend in water, and exposing the negative plates in the air; D, connecting the positive plate with the negative plates by using outer conductors and an external resistor, thus forming a current loop. The positive plate is located under a mud-water interface, round holes which are in equidistant array arrangement are formedin the negative plates, the root systems of the aquatic plants penetrate through the holes in the positive plate and are rooted in bottom mud, the negative plates are suspended on an overlying water -air interface, and the positive plate and the negative plates are sequentially connected through the external guide lines and the external resistor to form a current path. The method disclosed by theinvention is simple, the operation is convenient, and the structure is simple; absorption of the aquatic plants on nutrient substances is promoted, the black and smelly water body is converted into plant biomass, and blackening and smell as well as eutrophication of a water body are improved.

The invention provides a soil pollution remediation composition and application thereof. The soil pollution remediation composition comprises the following components of sodium percarbonate, ferrous sulfate, citric acid and sodium persulfate, wherein the molar ratio of the ferrous sulfate to the citric acid is 1:1; the sodium percarbonate and the sodium persulfate are used as oxidants; the molar ratio of the citric acid to the oxidants is (1 to 5):10; the molar ratio of the sodium percarbonate to the sodium persulfate is 1:(5 to 10); at least the sodium percarbonate and sodium persulfate are individually packaged before use. The soil pollution remediation composition can be used for effectively remedying the polluted soil.

The invention discloses a microbubble generator used for irrigation. The generator comprises a casing with a water inlet and a water outlet. The generator is characterized in that an inner side of the water inlet of the casing is provided with an air inlet; an air inlet pipe is arranged in the air inlet; an external end of the air inlet pipe is connected with an air pump; an inner end of the air inlet pipe is connected with an injector; and the casing between the air inlet and the water outlet is successively provided with a deflector, a spoiler and a diffuser along a water flow direction. The microbubble generator provided by the invention greatly improves the microbubble content of the irrigation water, and enables the irrigation water to become heavy-oxygen-enriched water, which can be applied to crop irrigation to increase oxygen content and redox potential of the soil, promote growth of crop roots, provide good habitat conditions for root microorganism, and benefit absorption and utilization of water and nutrient by crops, thereby improving disease resistance, quality and yield of crops.

The invention provides a method for treating organic wastewater through catalytic activation of persulfate by utilizing iron oxychloride. The method comprises the following steps: adding iron oxychloride into organic wastewater, and carrying out an adsorption reaction so as to obtain a mixture; and adding persulfate into the mixture, wherein the persulfacte is subjected to catalytic activation by iron oxychloride so as to produce sulfate radicals for degrading the organic wastewater. According to the method disclosed by the invention, the persulfate serves as an oxidizing agent and is subjected to efficient catalytic activation so as to produce the sulfate radical SO4<.->; by utilizing the catalyst iron oxychloride, the sulfate radical has high redox ability and has long existing life in aqueous solution, the decay time is 4 seconds, and the stability of the oxidizing agent is high, so that a majority of organic pollutants can be completely degraded, and the performance of the iron oxychloride is stable. Meanwhile, the invention further provides a novel thought of treating pollutant effluents by persulfate.

The invention aims at providing a temperature resistance domestication method for daphnia and a method for conducting ecological repair on a water body through daphnia. The method includes the steps that A, daphnia is placed in a breeding solution to be bred for a set period of time, and the temperature of the breeding solution is changed into the preset temperature according to the same tendency; B, the step A is repeatedly executed till the temperature of the breeding solution reaches the preset limiting temperature, beneficial microorganisms are put in, and domestication of daphnia is completed. By putting daphnia domesticated according to the method in the water body rich in toxic substances and algae, the water body can be purified, the underwater ecological balance can be repaired, and the ecological self-purification of the water body can be achieved.

The invention discloses a method and device for utilizing microbial fuel-cell-submerged plant to conduct situ-control on phosphorus release of sediment. The method comprises the steps that A submergedplants are planted in eutrophic water body sediment; B, an anode plate is buried on the lower part of the bottom mud layer-water interface and close to the root system of the submerged plants; C, a cathode plate is arranged at the water-air interface, so that the cathode material is suspended in the water face, and part of the cathode plate is exposed to the air; and D, the anode plate and the cathode plate are connected through a guide line and an external resistor to form current loop. The submerged plants lay the roots in the bottom mud, a hole is formed in the anode plate, so that the anode plate penetrates through the submerged plants and is located on the lower part of the mud-water interface, an overlying water layer is on the mud-water interface, the cathode plate is suspended atthe position of the overlying water layer-air interface, one end of the external guide line is connected with the anode plate, and the other end is connected with the external resistor and the cathodeplate. The method is simple, easy and convenient to operate, the structure is simple, a more stable phosphorus morphology is formed and adsorbed into the sediment, and thus phosphorus release of thesediment is obviously reduced.

The invention provides a method for reducing accumulation quantity of arsenic in crops and belongs to the fields of heavy metal pollution remediation and agricultural product safety. According to the technical scheme adopted by the invention, deep ploughing is performed on soil before crops are planted, soil moisture content is reasonably controlled, and an appropriate amount of clay minerals and an arsenic precipitate adsorbent are added into arsenic-polluted surface soil to improve soil; surface soil and an improver are turned over and are uniformly mixed, and are aged for 20 days; and a base fertilizer is added and crops are planted, and a leaf phosphorus fertilizer is sprayed after crops normally grow to reduce arsenic accumulation of the crops and increase the crop yield. The method is strong in operability, is environmentally friendly, and can realize continuous and safe planting of crops on medium-light arsenic polluted soil.

The invention provides a novel covalent organic framework material, which is obtained by reaction of 2,3,5,6-tetraamino-1,4-benzoquinone and cyclohexanehexone or a hydrate thereof. The invention also provides a corresponding preparation method. The invention further provides application of the covalent organic framework material in a lithium ion battery, especially as a positive electrode material. The covalent organic framework material is in a two-dimensional lamellar shape, and has a large number of conjugated carbonyl groups and carbon-nitrogen double bonds with electrochemical activity, so that the lithium ion battery prepared from the covalent organic framework material has relatively high energy density.