27 results about "Iron agent" patented technology

The invention belongs to the technical field of crop pollution prevention, and particularly relates to a rice heavy metal adsorption and isolation method based on iron agent regulation and control. According to the method, the iron agent is applied to the polluted rice field soil to induce the soil-rhizosphere interface to form an iron film, heavy metals (such as As, Cu, Pb and Cd) are fixed by virtue of adsorption and complexing effects of the iron agent, and migration of the heavy metals to rice roots is reduced, so that accumulation of the heavy metals at edible parts (leaves and ears) of the rice is reduced; the tolerance of the rice in a polluted environment is enhanced; and the risk of heavy metals in a food chain is reduced. Experiments show; through treatment of an iron film formed by a certain iron-based concentration, accumulation of the heavy metals in the rice leaves can be remarkably reduced, and the accumulation amount of the heavy metals in the rice leaves is far lower than the accumulation amount (1 / 40-1 / 120) of the heavy metals in rice roots. The invention provides an effective solution for farmland soil remediation and crop safety production.

The invention belongs to the field of field remediation functional materials, and particularly relates to a preparation method and application of a chelating iron agent for remediation of organic contaminated soil. The preparation method comprises the following steps: firstly, preparing a chelating agent aqueous solution, adding ferrite under a continuous stirring condition to carry out chelation reaction, then adding organic acid to carry out stabilization treatment, finally adding an activating auxiliary agent fulvic acid, uniformly mixing, and adjusting the pH value of the solution to a required value to obtain the chelating iron agent. The chelating iron agent can be used for activating an oxidizing agent during in-situ / ex-situ remediation of an organic polluted site, and has the advantages that the chelating iron agent is environment-friendly, the ferrous ion stability is good, the contact reaction with the oxidizing agent is mild and controllable, iron precipitates are not easy to form, and the growth and metabolic activity of indigenous organisms are stimulated.

The invention discloses a method and equipment for in-situ synthesis of food-grade nano iron oxide from a donkey-hide gelatin medium, and the method comprises the following steps: dissolving enzymolysis donkey-hide gelatin peptide at 75-82 DEG C by using an interlayer heating type gelatin boiling tank to form a reaction medium, applying 40-60kHz ultrasonic waves through a piezoelectric ceramic ultrasonic vibrator array integrated at the bottom of the tank, and generating a 0.3-0.5 T magnetic field through a Helmholtz coil surrounding the tank, the uniform dispersion and directional crystallization of Fe < 3 + > / Fe < 2 + > (the molar ratio is 2: 1) in a donkey-hide gelatin matrix are synergistically promoted; the preparation method comprises the following steps: accurately regulating the pH value to 8.5-9.5 by utilizing an ammonia water pulse quantitative injection device, combining citric acid-ascorbic acid dual modification, and finally carrying out magnetic separation, ceramic membrane filtration and freeze drying to obtain the high-purity beta-cyclodextrin with the average particle size of 38.5 + / -4.2 nm (PDilt; 0.2) of nano iron oxide; the bioavailability is more than two times that of a traditional iron agent, and no organic solvent is left; according to the method, safe, efficient and large-scale preparation of the nano iron oxide is realized through equipment-process collaborative innovation.

The application discloses a kind of iron agent enhanced whole body blood vessel multi-modal magnetic resonance imaging method, system, the method comprises: after target is divided into multiple scanning stations from head to foot, iron agent enhanced whole body blood vessel bright blood imaging is carried out;Automatic positioning whole body blood vessel stenosis and quantifying its stenosis degree, and output the scanning station and position range information of blood vessel stenosis region;Judge whether there is blood vessel stenosis region meeting condition;According to its spatial position information, guide MRI system examination bed to move for blood vessel stenosis region meeting condition, and carry out local black blood imaging with not less than the spatial range of blood vessel stenosis region;Blood vessel stenosis region exists in interval period and carries out local bright blood imaging to the scanning station, obtains blood vessel cavity structure image;Local bright blood imaging is registered with whole body blood vessel bright blood imaging, and the information transmission of blood vessel stenosis region is completed, and local inflammation imaging is carried out.The application realizes the multi-modal imaging evaluation of whole body blood vessel in clinically acceptable scanning time.

This invention discloses a denitrification biological carrier, its preparation method, and its application. The raw materials for preparing the denitrification biological carrier include an iron agent, modified activated carbon, polycaprolactone, sodium dodecyl sulfate, and a hydrogel binder. The modified activated carbon is 3-chloro-2-hydroxypropyltrimethylammonium chloride-modified activated carbon. The iron agent not only removes dissolved oxygen from water but also reduces total nitrogen in wastewater. The modified activated carbon improves its adsorption affinity for nitrogen-containing compounds. Polycaprolactone serves as a slow-release carbon source for denitrification, exhibiting high carbon source utilization. Sodium dodecyl sulfate, through its foaming properties, together with the modified activated carbon, iron agent, and polycaprolactone, forms a high-mechanical-strength, rough, and porous biological carrier structure, providing excellent attachment conditions for heterotrophic denitrifying bacteria. Therefore, applying the denitrification biological carrier of this invention to wastewater treatment systems can achieve good nitrogen removal efficiency and economic benefits.

The invention relates to the technical field of ironing machines, in particular to an ironing device which comprises an ironing body, the ironing body is provided with an adsorption channel and an ironing module, and the ironing module acts on clothes to be ironed; the heating module is arranged on the ironing main body and acts on the ironing module, so that the ironing module is heated to a preset temperature value; the atomization module is arranged on the ironing main body, and the output end of the atomization module extends to the corresponding position of the ironing module, so that the ironing agent is converted into mist and acts on the clothes to be ironed; and the negative pressure module is arranged on the ironing main body, and the negative pressure module acts on the adsorption channel, so that negative pressure airflow is formed in the adsorption channel. The ironing device does not need to be provided with a paving workbench with a large size, and after the ironing device is used, the size of the ironing device is relatively small, so that the ironing device is relatively convenient to store and carry.

This invention discloses a method for the synergistic control and removal of organic matter in the hydrometallurgical process of zinc smelting, belonging to the field of hydrometallurgical technology. It includes the following steps: incorporating the TOC content of manganese ore powder and iron removal agent into quality monitoring and limiting content thresholds; controlling the addition amounts of flocculant, bone glue, and organic cobalt removal agent; and simultaneously adjusting the concentrations of zinc ions and soluble silicon in the supernatant to reduce liquid viscosity, thereby reducing the introduction of impurities at the source; adding activated carbon to the purification process to adsorb organic matter; and adding a waste liquid circulation filtration system to the electrolysis process, while selectively adding modified activated carbon to remove suspended solids, organic matter, colloids, and harmful impurity ions from the electrolytic waste liquid. This invention achieves three main benefits: first, it establishes a synergistic removal system for fine suspended solids, colloids, organic matter, and impurity ions; second, it increases the electrolysis current efficiency to over 90% and reduces cell voltage; and third, it improves the utilization efficiency of fresh liquid and reduces overall production costs.

The invention discloses a device and a method for synchronously recovering light Fenton complex breaking and heavy metals based on iron modified resin. The device comprises an acidity adjusting tank, an H2O2 pretreatment tank, a two-stage photo-Fenton reaction device, an iron recovery and iron modified resin regeneration device, a regeneration liquid storage tank, a heavy metal recovery concentrated solution storage tank, a resin recovery device and an iron agent storage tank. And then carrying out photo-Fenton complex breaking and heavy metal ion synchronous adsorption and recovery treatment on the wastewater by using iron modified resin under illumination, recovering iron ions from the treated effluent by using resin, discharging the treated effluent after reaching the standard, carrying out regeneration treatment on the iron modified resin adsorbing the heavy metal ions by using a regeneration solution, and recovering a heavy metal concentrated solution and desorption resin. The recycled desorption resin and the resin for recycling iron realize regeneration of the iron modified resin in the presence of an iron ion supplement, and are recycled for photo-Fenton complex breaking and synchronous recycling of heavy metals. According to the method, the purpose of synchronous complex breaking and adsorption recovery of the heavy metal wastewater can be achieved, iron recovery and regeneration and synthesis of the iron modified resin can be achieved, the resource utilization rate of the resin is high, and large-scale and batch production can be achieved.

The invention belongs to the technical field of oil field water treatment, and particularly relates to a treatment system and method for gas field produced water containing liquid hydrocarbon. The treatment system comprises a separation device, a settling tank and a scaling device which are communicated in sequence. The treatment method comprises the following steps: 1) separating the liquid hydrocarbon-containing gas field produced water in a separation device to obtain a water-hydrocarbon mixed solution; 2) mixing the water-hydrocarbon mixture and crude oil according to a volume ratio of (3-1): 1, conveying the mixture to a settling tank, separating a crude oil liquid hydrocarbon mixture and settling water through gravity settling, and externally conveying the crude oil liquid hydrocarbon mixture through a pipeline; 3, the settling water is conveyed into a scaling device, an iron removal agent, a calcium and magnesium removal agent and a demulsifying agent are sequentially added, then precipitation reaction is carried out, and reinjection water is obtained on the upper layer. Liquid hydrocarbon can be recycled, meanwhile, the hydrocarbon content in water is reduced, the settling water is treated through a treating agent, and the requirement of oilfield reinjection water is met.

The application provides a method for removing molybdenum from ammonium rhenate flocculation and precipitation of iron sulfate, and relates to the technical field of rare metal hydrometallurgy and high-purity material preparation. The method realizes precise pH control by "weak alkali reaction-weak acid back adjustment", the pH before precipitation is controlled to be 8-10, slow hydrolysis of iron ions and combination with molybdenum are ensured, and a large amount of colloids is avoided; the pH is adjusted to 5-7 after precipitation, the "capture effect" of iron hydroxide is used to deeply remove molybdenum, and the pH change is used to desorb the entrained rhenium, so that the rhenium yield is significantly improved; by controlling the dosage of iron sulfate to be 0.2-0.8 g / L, sufficient precipitation of molybdenum is ensured, and the problems of filtration difficulty and rhenium adsorption loss caused by excessive iron agent are avoided; the content of molybdenum is reduced to below 1 ppm, and the problem of serious rhenium entrainment loss in the traditional iron salt method is avoided.

The application discloses a novel ethylene cracking coking inhibitor, a preparation method and application thereof. The ethylene cracking coking inhibitor is composed of the following components and monomers according to mass percentage: 45-50% of a supported iron passivator, 5-10% of an oil-soluble nickel passivator, 8-15% of a soluble chromium passivator, 2-5% of an anionic surfactant, 20-35% of an olefin recovery agent, 1-5% of a high-temperature antioxidant, 1-5% of a high-temperature polymerization inhibitor and 1-5% of a coking scale dispersant. The supported iron passivator is formed by loading a sulfur-phosphorus compound on an active nano-carrier. The olefin recovery agent is at least one of diesel oil, gasoline, naphtha, liquid paraffin and Fischer-Tropsch synthetic wax oil. The coking inhibitor can passivate the furnace tube at high temperature, prevent coking scale from corroding the inner wall of the furnace tube, and various organic active components can rapidly vaporize under cracking conditions, are uniformly dispersed on the inner wall surface of the cracking furnace tube and improve the coking inhibition effect.

The invention belongs to the field of water treatment, and particularly relates to a system and a method for synergistically treating phosphorus-fluorine wastewater by using a calcium oxide-iron composite reagent. The system provided by the invention comprises a calcium oxide emulsion preparation and dosing device, an iron medicament preparation and dosing device and a phosphorus-fluorine wastewater flow control and treatment device. The system provided by the invention can simultaneously realize accurate metering and cooperative addition of a calcium oxide emulsion (liquid-phase medicament) and an iron medicament (solid-phase medicament), and greatly improves the treatment efficiency of phosphorus-fluorine wastewater.

The invention relates to the technical field of drug delivery, and discloses an MTHFD2siRNA loaded nano-composite as well as a preparation method and application thereof. The nano-composite comprises siRNA and PFeOOH, the siRNA comprises MTHFD2siRNA-1 of a fragment 1 of a target MTHFD2, or MTHFD2siRNA-2 of a fragment 2 of the target MTHFD2, or MTHFD2siRNA-3 of a fragment 3 of the target MTHFD2, and the PFeOOH comprises the siRNA and the PFeOOH. Wherein the sequence of the fragment 1 of the MTHFD2 is as shown in SEQ ID No. 1, and the sequence of the fragment 2 of the MTHFD2 is as shown in SEQ ID No. 2; the sequence of a fragment 3 of the MTHFD2 is as shown in SEQ ID No. 3; the MTHFD2siRNA loaded nano compound provided by the invention can efficiently deliver siRNA, solves the problem of combined delivery of siRNA and an iron agent, and realizes synergistic induction of tumor cell ferroptosis by gene knock-down and iron accumulation.

An iron supply agent includes sodium iron citrate aqueous solution prepared by stirring and mixing citric acid, water and iron combined with sodium bicarbonate, and a chelating agent mixed with the aqueous solution of sodium iron citrate. The chelating agent is lignin sulfonic acid derived from lignin waste water.

This application belongs to the technical field of elemental additives for cast aluminum alloys, specifically a potassium fluoroaluminate type iron agent, its preparation method, and an aluminum alloy. The potassium fluoroaluminate type iron agent disclosed in this application is characterized by comprising: stearic acid; reduced iron powder, wherein the mass fraction of iron in the reduced iron powder is ≥98.5%; potassium fluoroaluminate, wherein the potassium fluoroaluminate and reduced iron powder are pressed and bonded together by stearic acid to form the potassium fluoroaluminate type iron agent; wherein the density of the potassium fluoroaluminate type iron agent is ≥3.7 g / cm³, and the mass fraction of iron in the potassium fluoroaluminate type iron agent is 73%-77%.

The utility model relates to iron removal agent equipment for beer silica gel production, which comprises a fixed shell, a servo motor and storage equipment, the bottom of the fixed shell is provided with an opening, the servo motor is fixedly connected to the inner rear wall of the fixed shell, the driving end of the servo motor is fixedly connected with a lead screw, and the lead screw is fixedly connected with the storage equipment. The outer surface of the lead screw is in threaded connection with a movable block, the movable block is rotationally connected with a movable rod in a penetrating mode, and the bottom end of the movable rod is fixedly connected with a mounting plate. By designing the meshing mechanism of the movable rod and the fixed rack and the compound motion driven by the servo motor driving the screw rod, the compound motion of linear movement and circumferential rotation of the storage equipment is realized. Due to the compound motion, the iron removal agent guided out by the discharging pipe is in a more dispersed state at the opening in the bottom of the fixed shell, so that the contact uniformity of the iron removal agent and beer silica gel is remarkably improved. The method has important significance for improving the production quality and efficiency of the beer silica gel.

The invention discloses a blood-enriching composition for promoting utilization of an iron agent, which belongs to the technical field of health-care food, and is prepared from the following raw materials in parts by weight: 0.5-3 parts of black ginseng, 9-15 parts of astragalus membranaceus, 0.2-1 part of donkey-hide gelatin, 6-12 parts of hawthorn, 4-9 parts of jujube, 0.5-3 parts of double-petal red rose and a nutrient supplement. The nutrition enhancer at least comprises 0.05-0.5 part of an iron agent. According to the blood replenishing composition for promoting utilization of the iron agent provided by the invention, the black ginseng not only can alleviate the warm property of the astragalus membranaceus and enhance the qi tonifying ability of the astragalus membranaceus, but also can cooperate with the colla corii asini and the Chinese dates to nourish blood to carry qi, so that the situation that blood is not replenished due to deficiency of blood caused by independent blood replenishing is avoided. The black ginseng, the hawthorn and the double-petal red rose can promote blood circulation to remove blood stasis, promote transportation and transformation of the spleen and the stomach, prevent the donkey-hide gelatin and the Chinese dates from being greasy and obstructing the stomach, and are suitable for people with deficiency of qi and blood such as pale complexion, dizziness, weakness, palpitation, shortness of breath and inappetence caused by deficiency of qi and blood.

The invention discloses a reducing peptide self-assembled fiber-ferrous nano-composite and a preparation method and application thereof.The method comprises the steps that EV-10 fibers and FeCl3. 6H2O are mixed according to the mass ratio of 1: 1, reaction is conducted for 5-8 hours at the temperature of 60-65 DEG C under the condition that the pH value is 1.5-2.0, and the reducing peptide self-assembled fiber-ferrous nano-composite is prepared; and the amino acid sequence of the EV-10 is EQSLVCQCLV. The reducing peptide self-assembled fiber-ferrous nano-composite disclosed by the invention is high in bioavailability, can resist degradation of gastric juice and is degraded in intestinal tracts, so that absorption of the intestinal tracts is improved; no sodium borohydride reducing agent raw material is contained, so that the safety to cells and tissues is good; the compound is good in stability, and the reducing peptide self-assembled fiber can protect reduced iron and is not easy to oxidize; the iron supplement agent has a good iron supplement effect and can be used as a safe and effective iron supplement agent. The process disclosed by the invention meets the requirements of green foods and has a wide industrial popularization prospect.

The invention discloses a method for preparing high-nutrition bean flour through ion regulation combined with spray drying, and belongs to the technical field of bean product processing. The method comprises the following steps: spraying soybeans, drying and peeling; grinding into thick liquid; carrying out enzyme deactivation and inactivation; centrifugally discharging slag; sterilizing and deodorizing; performing composite enzymolysis; adjusting metal ions; sterilizing and concentrating; performing spray drying; the high-nutrition type bean flour is obtained. According to the method, soybeans are rapidly sprayed, drying and peeling of the soybeans are facilitated, a compound enzyme enzymolysis technology is adopted, the soybean enzymolysis degree is improved, more binding sites are exposed, a chelation reaction with ferric salt can be carried out to obtain a novel iron supplement agent polypeptide iron chelate, the bioavailability is high, meanwhile, a calcium supplement is supplemented, calcium ions can be combined with carboxyl of soybean peptide, and the calcium supplement effect is good. Meanwhile, the solubility and the heat stability are improved, and the limitations that the calcium content and the iron content of a traditional bean beverage are low and the bean beverage inhibits calcium and iron absorption are broken through.

The invention discloses a slow-release crude oil deferrization agent and a preparation method thereof, and relates to the technical field of petrochemical engineering, the deferrization agent is formed by compounding an acidic biological complexing agent, a slow-release complexing agent, an acidic surfactant and a precipitator according to a specific proportion; the preparation method comprises the steps of respective preparation and final compounding of the components, iron ions in crude oil are rapidly captured through the acidic biological complexing agent, long-acting deep iron removal is achieved through the slow-release complexing agent, dispersity is improved through the acidic surfactant, sedimentation of an iron complex is promoted through the precipitator, and all the components have a synergistic effect. The deferrization agent is high in deferrization rate, good in slow release effect, qualified in stability and low in corrosion to equipment, can effectively reduce the iron content of crude oil, is suitable for an industrial electro-desalting process, and solves the problems that an existing deferrization agent is not thorough in deferrization, poor in slow release property and high in corrosion.

The invention provides a deferrization agent and a preparation method and application thereof.The method comprises the steps that S1, molecular sieve powder, alumina powder, carbon powder, a first surface active agent, silica sol, ammonium phosphate and acid are mixed and kneaded for 30-60 min, then forming and drying are conducted, and a precursor is obtained; s2, carrying out modification treatment on the precursor in a mixed aqueous solution of quaternary ammonium base and a second surfactant for 0.5-2 hours, and roasting the obtained modified precursor to obtain a deferrization agent; and the acid amount of the deferrization agent is further limited. The deferrization agent prepared by the method can effectively remove inorganic iron and organic iron (especially petroleum acid iron) in hydrocarbon raw materials, and high deferrization efficiency is achieved.

The invention relates to the technical field of sewage treatment, and particularly discloses a composite functional agent for a sewage treatment plant, the active ingredients of the composite functional agent comprise sodium humate and an iron agent, the mass ratio of the sodium humate to the iron agent is (1: 0.2)-(1: 1.5), the sodium humate and the iron agent are compounded, and the composite functional agent is prepared by mixing the sodium humate and the iron agent. The three functions of deodorization, sludge activity improvement and sludge reduction can be realized, and a multifunctional synergistic effect is achieved, so that the problem of single function of an existing medicament is solved; and the agent has the advantages of no toxic component, no secondary pollution, improvement of the sludge dewatering performance, reduction of the sludge treatment difficulty, environmental friendliness, suitableness for biological treatment units and deodorization links of various town sewage treatment plants and industrial wastewater treatment stations, and wide application prospects.

The invention discloses a composite food-grade nano iron oxide particle for iron supplement coloring and a preparation method thereof, the nano iron oxide core with the particle size of 3-8nm is prepared by using food-grade ferric chloride and ferrous sulfate as raw materials through an alkaline coprecipitation method, and sodium citrate and gelatin are used for surface modification to obtain the composite food-grade nano iron oxide particle. And embedding with food-grade polysaccharides such as fructo-oligosaccharide to form stable composite particles. The iron content of the obtained product is greater than or equal to 65%, the absolute value of Zeta potential is greater than or equal to 25mV, the product can be stably dispersed for more than 30 days in a pH range of 3-8, the CIELAB chromaticity parameters are as follows: the L value is 28-35, the a value is 10-15 and the b value is 5-8, and the product has the coloring property required by dark food and excellent iron bioavailability; by accurately controlling the particle size and the surface characteristics, the problems that a traditional iron supplementing agent is low in absorptivity and a coloring agent is single in function are solved; the product is suitable for deep-color health-care food such as donkey-hide gelatin cakes and black sesame pills, and can achieve the dual effects of nutrient enrichment and appearance improvement.

The invention relates to the field of catalytic cracking passivators, and discloses a composition for preparing a catalytic cracking iron passivator, the catalytic cracking iron passivator and a preparation method and application of the catalytic cracking iron passivator. The composition contains a metal component, a butylamine ligand, a solubilizer and a solvent, based on the total weight of the composition, the content of the metal component precursor is 35-55 wt%, the content of the butylamine ligand is 10-30 wt%, the content of the solubilizer is 5-25 wt%, and the content of the solvent is 10-40 wt%. The metal component precursor comprises a first precursor and a second precursor, the first precursor is aluminum salt, and the second precursor is selected from at least two of magnesium salt, nickel salt, cobalt salt and chromium salt. According to the catalytic cracking iron passivating agent prepared from the composition for preparing the catalytic cracking iron passivating agent, on one hand, the solubility of the catalytic cracking iron passivating agent in raw oil is enhanced, and the reaction performance is improved; on the other hand, the iron capturing capacity is improved, and the excellent iron blunt performance is shown.

The invention discloses a crude oil solid and iron removal agent which comprises the following components in percentage by mass: 40-60% wt of a main surfactant which is an ester of polyoxyethylene ether and an acrylic polymer; 10-20% wt of an auxiliary dispersant, wherein the auxiliary dispersant is a sulfonic acid surfactant; the solvent oil comprises the following components in percentage by weight: 5% wt of alcohol solvent, 10% wt of water and 5-35% wt of aromatic solvent oil. The kinematic viscosity (20 DEG C) of the crude oil solid and iron removal agent is less than 500mm < 2 > / s, and the surface tension is less than or equal to 30mN / m. The crude oil deferrization agent is high in solid and iron removal efficiency, and the preparation method is simple.

[Problem] To provide an iron supplement free from bad taste (metallic taste), which is a drawback of iron agents, and free from side effects such as nausea, vomiting, and constipation, and that has excellent storage stability (oxidation resistance). [Solution] The present invention provides an iron supplement containing a magnesium hydroxide-based solid solution represented by formula (1): (Mg)1-x-y(Fe2+)x(M2+)y(OH)2-nz(An-)z. (In the formula, M2+ represents at least one selected from Zn, Mn, Cu, and Co, An- represents at least one of organic acid ion moieties, x, y and z are in the respective ranges: 0 < x < 0.3, preferably 0.01 ≤ x ≤ 0.2, 0 ≤ y < 0.2, preferably 0 ≤ y ≤ 0.1, and 0 ≤ z < 0.1, preferably 0.001 ≤ z ≤ 0.005, and n represents zero or an integer in the range of 0-4.)

The invention belongs to the technical field of crop pollution prevention, and particularly relates to a rice heavy metal adsorption and isolation method based on iron agent regulation and control. According to the method, the iron agent is applied to the soil of the polluted rice field to induce the soil-rhizosphere interface to form an iron film, heavy metals (such as As, Cu, Pb, Cd and Zn) are fixed by virtue of adsorption and complexation of the iron agent, and migration of the heavy metals to rice roots is reduced, so that accumulation of the heavy metals at edible parts (leaves and ears) of the rice is reduced; the tolerance of the rice in a polluted environment is enhanced; and the risk of heavy metals in a food chain is reduced. Experiments show; through treatment of an iron film formed by a certain iron-based concentration, accumulation of the heavy metals in the rice leaves can be remarkably reduced, and the accumulation amount of the heavy metals in the rice leaves is far lower than the accumulation amount (1 / 40-1 / 120) of the heavy metals in rice roots. The invention provides an effective solution for farmland soil remediation and crop safety production.