303results about How to "Improve chemical reactivity" patented technology

A preparation method of a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material includes: (1) etching Ti3AlC2 with LiF / HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material. A method for degrading and removing organic pollutants in water includes (1) etching Ti3AlC2 with LiF / HCl to prepare two-dimensional transition metal carbide nanosheet; (2) preparing a nanosheet aggregate by electrostatic self-assembly of a two-dimensional transition metal carbide nanosheet and a positively charged nitrogen-containing cationic compound; (3) calcining the nanosheet aggregates to prepare a two-dimensional nitrogen-doped carbon-based titanium dioxide composite material; (4) placing the two-dimensional nitrogen-doped carbon-based titanium dioxide composite material into water containing organic pollutants to degrade and remove organic pollutants in water.

The invention discloses a room-temperature self-repairing fiber-reinforced epoxy composite material and a preparation method thereof. According to the method, a repairing agent is loaded in a capillary tube, and buried among fiber-reinforced epoxy composite material layers, and the repairing agent contains a certain amount of foaming agent. After being formed, the composite material is heated above the decomposition temperature of the foaming agent, so that the interior of the capillary tube produces positive pressure. When the material is damaged to cause the breakage of the capillary tube, the repairing agent can fast flow to a breakage surface and produce reaction under the promotion of pressure, thus rebinding cracks together and repairing the damage of the material. The material has the outstanding characteristics that the capillary tube can provide enough repairing agent, so that the material has higher repair efficiency; through the introduction of the foaming agent, the repairing agent in the capillary tube can be guaranteed to fast flow automatically when the material is damaged.

The invention discloses a method for preparing nanometer microcrystalline cellulose by combining acid hydrolysis and ultrasonic treatment. The method comprises the following steps of: preparing a sulfuric acid solution with certain concentration; slowly adding tonnor EM100 powder, which is provided by Shanghai Tonnor Material Science Co., Ltd, to the sulfuric acid solution while stirring; ultrasonically treating for certain time after the tonnor EM 100 powder is completely dissolved; adding a certain amount of distilled water to stop the reaction after the ultrasonic treatment; carrying out centrifugal separation onto the obtained mixed solution; dialyzing the collected nanometer microcrystalline cellulose colloid until the collected nanometer microcrystalline cellulose colloid is neutral; and finally refrigerating and freeze-drying the dialyzed nanometer microcrystalline cellulose colloid to obtain the nanometer microcrystalline cellulose powder. The method for preparing nanometer microcrystalline cellulose by combining acid hydrolysis and ultrasonic treatment is simple to operate, free of damages to the cellulose degradation and easy to control; and more importantly, the environment pollution can be reduced in comparison with the pure acid hydrolysis.

The invention discloses a method for quickly forming a soft power lithium-ion cell. The method comprises the following steps: (S1) supplying a heat source for heating a cell by using a heating plate;(S2) driving a pressurizing plate to pressurize the cell by using a servo motor; (S3) performing gradient charging on the cell; and (S4) charging the cell till reaching high charge state. According tothe invention, a stable, compact and uniform SEI film is formed on a cathode surface, the performance of the lithium-ion cell is greatly promoted, the early failure of the lithium-ion cell in the circulating process is avoided, the yield of the cell is increased, the cell quality is optimized, the forming time of the cell is shortened, the large-scale production of the cell is realized and the method has wide application prospect.

The invention provides high-flowability pregelatinized starch and a method for preparing the same by mechanical activation, which belong to the technical field of starch modification processing. The method comprises the following steps: uniformly mixing starch and a certain amount of flow aid in a high-speed mixer uniformly, pre-drying the starch by using heat generated in a high-speed mixing process, and controlling the water content in the starch to be lower than 15 percent; and placing the uniformly mixed materials in a ball mill containing a milling medium, well regulating the temperature for constant-temperature dissolution in water, performing mechanical activation for a certain time period, taking the starch out, and sieving the starch with a 80 to 100-mesh sieve. The method has the advantages of simple process and equipment, small investment, environmentally-friendly process, low production cost, easy product quality control and the like. The prepared product has the characteristics of high flowability, loose structure, uniform particles and precision control over pregelatinization degree and can be widely used in industrials and fields of foods, pharmaceuticals, chemicals and the like.

The invention discloses a Fe / C composite porous structure material as well as a preparation method and application thereof. The Fe / C composite porous structure material is characterized by being prepared from low-grade sedimentary iron ore and biomass as raw materials in manners of crushing, mixing, extrusion molding and pyrolysis and reduction reaction in the presence of hydrogen atmosphere at 650-900 DEG C, wherein the main phase composition comprises biomass carbon and zero-valent iron. The Fe / C composite porous structure material disclosed by the invention is high in opening porosity, magnetic susceptibility, adsorbability and biological chemical activity, can be used for treating eutrophicated river water, living sewage and landscape water bodies, or can be used for mediation of underground water pollution and polluted soil.

The invention discloses a branched side chain polymer anion exchange membrane and a preparation method thereof. Preparation of the membrane material is based on the situation that chloromethyl polysulfone serves as a macroinitiator, p-chloromethyl styrene serves as a monomer, and a series of polymers containing branched side chain structures are synthesized through an ATRP reaction. Rich end groups with high chemical reactivity are utilized, and the alkaline anion exchange membrane with a low chloromethylation degree and high conductivity can be prepared through after-treatment. In addition, micro-phase separation of different degrees can be achieved in the membrane by modulating the branching degrees of side chains, and the objective of considering both the conductivity and stability of the anion exchange membrane is achieved. The prepared anion membrane is high in structural adjustability, high in conductivity and good in self-rejection swelling property, and has great significance for research on the conductivity and stability balance of the membrane.

The invention discloses a cobalt-free lithium-rich ternary anode material NMA and a preparation method thereof. The chemical formula of the material is Li1 + PNi1-x-y-zMnxAlyMzO2, wherein: 0.03 < P <0.3, 0.1 < X <0.6, 0.01 < Y <0.1, 0.01 < Z <0.3, M is one or more of Ce <3+>, Ti <4+>, Zr <4+> and Mg <2+>; the precursor of the material is nano sheet-shaped agglomerated particles, and the thicknessof the nano sheet-shaped precursor is 30-50 nanometers. The material has the main application and advantages that the lithium-rich layered NMA cathode material is prepared by combining layered LiNiO2phase with layered LiMnO2 phase by replacing expensive Co with cheap Mn and adding excessive lithium (rich lithium). Since cobalt is not contained, the preparation cost is reduced by 20-30%, the capacity of the anode material reaches 190-200 mAh / g, and the capacity retention rate of 100 cycles is kept to 90-95%.

The invention relates to an Al-Ga-In-Sn-Zn alloy as well as a preparation method and an application thereof. The alloy is prepared from the following components by weight percent according to a mechanical alloying technique: 45-97wt% of metal Al, 1-20wt% of metal Ga, 0.5-15wt% of metal In, 1-10wt% of metal Sn and 0.5-10wt% of metal Zn. The alloy of the invention can directly react with water at the temperature of larger than or equal to zero DEG C so as to realize the effect of rapidly producing hydrogen; and hydrogen-producing rate reaches more than 90% of a theoretical value, and the reaction rate reaches 200ml / min.s, thereby meeting the dynamic powder requirement of hybrid electric vehicle travelling and greatly improving the utilization rate of gasoline.

The invention discloses a carboxylic oxidized graphene preparing method and a method for modifying a release film by means of carboxylic oxidized graphene. According to the carboxylic oxidized graphene preparing method, oxidized graphene solution is used as the raw material, amino acid serves as the carboxylation reagent, the ph value of a reaction system is adjusted to be alkaline, heating reaction is conducted for a while, then natural cooling and dialysis are conducted in sequence to remove foreign ions, and then carboxylic oxidized graphene solution is obtained. When the carboxylic oxidized graphene solution is used for modifying a functional layer of the organic release film, carboxylic oxidized graphene is used as a modifier, and the surface functional layer of the organic release film is modified through chemical blending modification, interfacial polymerization modification, surface graft modification or self-assembly modification. Oxidized graphene with higher carboxyl functional group content can be obtained, higher hydrophilia, solubility, electric charge property and chemical reactivity of oxidized graphene can be realized through higher carboxyl content, and then the release film has higher permeability, entrapment property and hydrophilia.

The invention discloses a matte brick stain-proofing agent. The matte brick stain-proofing agent is prepared from a component A, a component B and a component C, wherein the component A is an organic solvent, the component B is silicon resin, and the component C is at least one of silicone oil and organosiloxane monomers. The invention further provides a preparation method of the matte brick stain-proofing agent. By compounding the components, the matte brick stain-proofing agent can achieve a good stain-proofing effect when used for performing stain-proofing treatment on the surfaces of matte bricks in follow-up application; besides, the matte brick stain-proofing agent has a very long shelf life and service life; moreover, the preparation technology is simple and easy to implement and can be conveniently applied to industrial production.

The invention discloses a method for pre-treating a chitin raw material, which is characterized by comprising the following steps: 1), filling the chitin raw material in a gas explosion expansion tank and injecting a gas explosion expansion medium which may be vapor, water, aqueous ammonia or ethanol; and 2), relieving the pressure in the gas explosion expansion tank instantaneously and spraying the chitin raw material into a normal pressure container to obtain a chitin concentrate. Compared with the prior art, the method has the advantages of: 1), loosening the compact crystal structure of the chitin and increasing the exposure of active groups; 2), increasing the activity of chemical reaction to smoothly perform a main chemical reaction and increase the reaction speed; and 3), performing the main chemical reaction at a low temperature, inhibiting side reactions and improving product yield.

The invention discloses a method for preparing a heavy metal adsorbent. The method comprises the following steps: firstly carrying out alkali treatment on bagasse to prepare bagasse cellulose; carrying out ultrasonic activation on the bagasse cellulose, and sequentially adding an initiating agent, N,N'-methylene bisacrylamide and acrylic acid for grafting reaction to prepare a graft copolymerization product, wherein the N,N'-methylene bisacrylamide and the acrylic acid are neutralized by an NaOH solution; sequentially washing by using distilled water and absolute ethyl alcohol, drying and crushing to obtain a crude product of the heavy metal adsorbent; and carrying out acetone extraction to obtain the purified heavy metal adsorbent. Compared with the prior art, the preparation method disclosed by the invention has the beneficial effects of crushing and removing the outer layer of a cell wall of a bagasse fiber by carrying out ultrasonic activating treatment on the bagasse fiber, so that the chemical reaction activity of the bagasse fiber is enhanced, the grafting ratio of the grafting reaction is increased and the adsorption property of a product is improved.

The invention discloses an enzymatic hydrolysis lignin based epoxy resin preparation method which comprises the following steps of adding 10 to 20 weight parts of enzymatic hydrolysis lignin and 2 to 5 weight parts of a phase transfer reagent into 118 to 302 weight parts of epoxy chloropropane solution, heating to 50 to 100 DEG C, fully stirring so that the materials are evenly mixed, adding 7 to 15 weight parts of a catalyst, performing reflux reaction for 3 to 8 hours, washing reactant for 3 to 5 times after the reaction finishes, taking an organic layer, performing reduced pressure distillation under the condition of temperature being 20 to 100 DEG C, and removing residual epoxy chloropropane and deionized water to obtain enzymatic hydrolysis lignin based epoxy resin. The method has the advantage of preventing poisonous and harmful reagent from being used; furthermore, a synthesizing technology is simpler, cost is lower, and industrialization is facilitated.

The invention relates to a normal temperature cured flexible epoxy composition for thin layer paving of road and bridge surfaces. The composition is prepared from a component A and a component B in a mass ratio of (1-2): 1. The component A comprises 10-100 parts by mass of flexible epoxy resin, 0-80 parts by mass of standard epoxy resin, 2-10 parts of a diluent and 5-10 parts by mass of a curing accelerant a; the component B comprises 40-100 parts by mass of a modified amine curing agent, 10-70 parts by mass of a toughening modifier, 1-10 parts by mass of a curing accelerant b, 1-3 parts of a coupling agent and 0.1-1 part of a defoamer. The invention further relates to a preparation method for the normal temperature cured flexible epoxy composition for thin layer paving of road and bridge surfaces. The normal temperature cured flexible epoxy composition for thin layer paving of road and bridge surfaces provided by the invention has the benefits of being good in flexibility, high in ductility, curable at normal temperature, convenient to construct, low in cost and the like.

The invention provides a device and a method for integrally treating oily sewage at the bilge of a ship. Oily sewage at the bilge enters into a regulating pool by passing through a collection pipeline and a grid and then enters into a flocculation reaction pool, coagulant polymerization and coagulant aids are respectively fed into the flocculation reaction pool by a reagent feeder, an agitator is arranged on the flocculation reaction pool, the oily sewage enters into a gravity type oil-water separator after being flocculated, an oil scraper is arranged on the upper part of the gravity type oil-water separator, an oblique plate structure is arranged on the lower part, the oily sewage at the bottom is collected by a sewage hopper and discharged by a blowdown pipe controlled by a blowdown valve, the oily sewage to be treated after being subjected to separation action of the gravity type oil-water separator enters into a membrane separation unit, ultrafiltrated concentrated water is discharged by a drain pipe, and a backwashing device is arranged on the membrane separation unit. By using the device and the method, the volume of a sewage storage cabinet in the ship can be saved, consumption of raw materials can also be reduced, recovery of oil resources and continuous use of treated sewage are realized, and the purposes of saving energy and reducing emission are achieved.

The invention discloses modified starch and a manufacturing method and application of the modified starch. The manufacturing method of the modified starch provided by the invention comprises the following steps: dispersing starch by an organic solvent, adding water and uniformly mixing to prepare a starch suspension, and performing the microwave or the ultrasonic treatment to obtain the modified starch. According to the invention, crystalline regions in modified starch granules are greatly reduced, and the crystallinity of the modified starch granules is decreased from 15-45% to 8-30%. After the crystallinity is decreased, cassava starch is used for manufacturing dialdehyde starch, hydroxypropyl starch and octenyl succinic anhydride starch ester and has obviously improved reactivity.

A preparation technology for a titanium-suboxide conductive ceramic electrode comprises the following steps: (1) according to a reaction equation to respectively weigh a titanium dioxide powder and a titanium hydride powder; (2) fully mixing the weight titanium dioxide powder and titanium hydride powder, so as to obtain a uniform mixture; (3) putting the mixture into a mold and performing precompression, so as to prepare a blocky material; (4) performing vacuum dehydrogenation processing on the blocky material; (5) performing hydrostatic-pressure repressing; and (6) performing high-temperature reaction and sintering, and cooling to obtain the blocky titanium-suboxide conductive ceramic electrode. By employing the in-site dehydrogenation technology, the obtained titanium powder is high in purity, the chemical reaction activity is good, the powder granularity is controllable, and the preparation period of the titanium-suboxide conductive ceramic electrode is substantially shortened.

The invention discloses a freezing low-temperature superfine grinding method for traditional Chinese medicine. The method includes the following steps of providing the clean, dry and segmented traditional Chinese medicine, adding water to the traditional Chinese medicine so that the traditional Chinese medicine can be fully soaked, completely removing moisture through settling, keeping the surfaces of the traditional Chinese medicine dry, conducting freezing at the temperature of -24 DEG C to -28 DEG C for 3 hours to 4 hours, and conducting superfine grinding on the frozen traditional Chinese medicine in the environment with the temperature lower than -10 DEG C. According to the method, due to the fact that the traditional Chinese medicine is frozen and can be easily smashed, the fineness degree of the dried traditional Chinese medicine powder where superfine grinding is conducted can reach 0.006 micron to 0.5 micron, effective constituents of the traditional Chinese medicine are fully released, the absorption rate and the utilization rate of the traditional Chinese medicine are increased, the obtained traditional Chinese medicine powder can be directly used for making medicine and health care food through extracting and processing, and the medicinal value of the traditional Chinese medicine is better utilized.

The invention provides a preparation method of lignin phenol resin prepolymer, which comprises the following steps: mixing lignin compound, phenolic compound and acid catalyst, and heating the mixture to be 180 to 350 DEG C for reaction so as to obtain mixed reaction liquid; and mixing the mixed reaction liquid with formaldehyde, and obtaining lignin phenol resin prepolymer after condensation polymerization. According to the invention, the phenolic compound is used as a solvent, double bonds and ether bonds on the phenolic compound are destroyed through an acid environment provided by the acid catalyst under a high temperature condition of 180 to 350 DEG C, so that the molecular weight of the phenolic compound is reduced; and while a phenol molecule is connected to the hydroxymethyl active group on a lignin, so that the chemical reactivity of a lignin molecule is improved, and the reactivity of the lignin phenol resin prepolymer is improved. Therefore, the obtained lignin phenol resin has good mobility, good heat resistance and high strength.

The invention discloses an electrolyzed seawater hydrogen production catalyst based on a MXene and transition metal carbide composite nanostructure and a synthesis method thereof, and belongs to the field of nanomaterials and catalysis. The catalyst consists of MXene of coating transition metal carbide nanoparticles by uniform-loaded nanocarbon. The preparation method comprises the following steps: the MXene, metal salt, pH buffer solution and a carbon source precursor are dissolved and mixed uniformly for centrifugation, washing, freezing and drying to obtain a mixture, and are calcined at high temperature in an inertia atmosphere to obtain a structure and component-controllable two-dimensional nanostructure electrocatalyst. The electrocatalyst can overcome the problem of reduction of performances caused by agglomeration and sintering of nanoparticles in the preparation and reaction process of trasition metal carbides, and solves the basic difficulties perplexing the performance exertion and application of the transition metal carbide nanocatalyst; and under the condition of approaching neutrality, excellent catalysis activity and stability are achieved on electrolyzed seawater hydrogen production, and the foundation is laid for wide application of the electrolyzed seawater hydrogen production technology.

The invention provides a modified rubber V belt made of nano-material, which comprises rubber matrix, vulcanizing agent, accelerators, stearic acid, antioxidant, softener and carbon black, and comprises further nano-zinc oxide and nano-calcium carbonate. The product is made with 2.5 to 10 portions of the nano-zinc oxide and 5 to 50 portions of nano-calcium carbonate on the basis of 100 portions of rubber matrix. Mechanical property, wear resistance, compression set and tearing property of the rubber can be improved obviously and the performance of the finished product is improved with indirect zinc oxide being replaced by the nano-zinc oxide, soft semi reinforcing carbon black being replaced by the nano-calcium carbonate.

The invention relates to the technical field of preparation of electrode materials of lithium ion batteries and in particular discloses a preparation method of a high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of a lithium ion battery. The method comprises the following steps: firstly adding a lithium source, nano titanium dioxide and tripolycyanamide into a ball according to a certain material ratio, taking absolute ethyl alcohol as a medium, ball milling and then spray drying, subsequently calcining the materials under the inert atmosphere condition, ball milling and screening to obtain a nitrogen-doped carbon-compounded lithium titanate material which is applied to the anode material of the lithium ion battery and is high in electrochemical performance. The preparation method of the high-performance nitrogen-doped carbon-coated lithium titanate composite anode material of the lithium ion battery is simple in process; the prepared anode material is high in reversible capacity and excellent in high-magnification cycle performance.

The invention discloses a pyrite nano mineral material and a preparation method thereof. The pyrite nano mineral material uses pyritic sulfur and sulphide concentrate as raw materials, the mass percent of pyrite in the pyritic sulfur is not smaller than 50%, and the mass percent of the pyrite in the sulphide concentrate is not smaller than 90%. The preparation method comprises the following stepsof: crushing pyritic sulfur ores, sieving with a sieve of 100 meshes to obtain powder or directly selecting the sulphide concentrate with the particle diameter which is smaller than 0.165mm as powder, adding a bonder to the powder, pelletizing and molding to obtain particles with the particle diameter of 1-3mm, calcinating the particles at a temperature of 500-1000DEG C for 0.5-30min under anaerobic conditions, separating gas from solids, condensating the gas, recovering sulfur, and cooling the solids under oxygen isolation conditions to a room temperature to obtain a finished product. The material has the advantages of large specific area, strong magnesium, high chemical reaction activity, simple preparation technology, low cost and wide raw material resources.

The invention provides a method for preparing zinc oxide nanometer hollow spheres in caustic corrosion reaction. The method is mainly characterized in including using the solution of Zn(Ac)2 as the initial reactant first, adjusting the pH value to 11.5-14 by adding ammonia, using ethanol as the solvent, finally forming the nanometer hollow spheres in the hydrothermal reaction between Zn(NH3)4<2+> and excessive ammonia at a high temperature. The entire reaction has simple material, easy operation, no need for any complex instrument processing, convenience and rapidness, which is a method of rapidly preparing the zinc oxide nanometer hollow spheres. The obtained hollow spheres have narrow size distribution and good dispersibility with an external diameter of 600 nm and an internal diameter of 200-300 nm. The caustic corrosion reaction is adopted to synthesize zinc oxide nanometer hollow spheres in the method, thus agglomeration phenomenon caused by an aging machine is obviated, complex operation steps of organic reaction synthesis, contamination and disturbance to objective material zinc oxide caused by the complex operation steps are obviated. The method is obviously characterized in high production rate, rapidness, easiness, convenient operation, low cost and environment friendliness.

A method of increasing stawenzymolysis rate co-pretreated synergy by steam blasting and ultramicro-crashing, the steps are as follows: treating the straw with 10-25% water with steam blasting at under 0.8-1.3Mpa conditions, airdrying the straw, crashing the straw with fluidized bed contraconsperging airflow ultramicro crashing machine, putting into pH 4.8 acetic acid-sodium acetate buffer, at the substrate concentration of 5-10%, adding cellulose 20-40FPA per gram of steam blasted straw spermicropowder, digesting at 40-50 Deg C for 26-36 hours. The cellulase is selected from recumbent Penicillium, Lee Trichoderma, Trichoderma viride, Aspergillus. By using steam blasting and ultramicro-crashing, cellulose in the pretreated straw obtained from the invention can be completely digested, hemicellulose can nearly be completely digested of cellulose. The method has the advantages of easy operaton, short hydrolysis time, clean and on pollution.

The invention discloses wholly-aromatic polymer fiber with high compound property. Wholly-aromatic polymer fiber obtained through direct fluorinated surface treatment is treated with a silane coupling agent containing amino group firstly, then hydrolysis is conducted with acid aqueous solution, and then treatment is conducted with a silane coupling agent containing amino group, epoxy group or allyl group to obtain the wholly-aromatic polymer fiber with high compound property. The surface of the fiber contains the active groups capable of reacting with matrix resin. It is found through infrared display that a Si-O-Si peak exists at the position of 1000-1100 cm<-1>, and a Si element energy spectrum peak exists at the position of 103.6 eV binding energy of an X-ray photoelectron spectroscopy diagram. Through chemical bonding of the massive active groups including amino group, epoxy group and allyl group on the surface of the fiber, the fiber can be connected with matrix resin or a curing agent system of the matrix resin through a powerful covalent bond, the bonding capacity between the fiber and the matrix resin is improved greatly, and low fluorination degree and high compound property are realized.

The present invention prepares composite nano epoxy functional polymer / SiO2 particle with the materials including inorganic nano SiO2 particle, organic olefine monomer, olefine monomer with epoxy radical second crosslinking agent and through emulsion polymerization or suspension polymerization in water medium in the presence of emulsifier and initiator. The composite particle has the characterized structure comprising inorganic nano SiO2 particle as core, organic polyolefin as shell and epoxy functional radical on the surface; and has particle size smaller than 100 nm, chemical bond connection between the core and the shell and epoxy functional radical with very high chemical reaction activity. The present invention has wide application in developing nano technology.

The invention discloses a preparation method of a fluoride anti-fingerprint agent. Perfluor alkyl alcohol and carbimide alkyl trialkoxysilane are used as reaction substrates, and addition reaction is carried out to prepare a crude product; the superfluous carbimide alkyl trialkoxysilane is removed through reduced pressure distillation, and a fluoride anti-fingerprint agent concentrated solution is obtained; and the fluoride anti-fingerprint agent concentrated solution is diluted by 1,1,2,2- tetrafluoride ethyl methyl ether, and a final product that is the fluoride anti-fingerprint agent is obtained. The reaction condition of the method is mild, a noble metal catalyst is not needed, irritant and corrosive materials are not used, the process safety is good, the cost of production is low, and the method is conducive to industrial production.

The invention discloses phenolic modified lignin and a preparation method thereof, and application of the phenolic modified lignin serving as an adsorbent to adsorb heavy metal ions. The preparation method comprises the following steps of: adding alkali into a reed raw material, stewing, adjusting the pH value and extracting alkali lignin; adding formaldehyde and sodium hydroxide into the alkali lignin, heating to make the alkali lignin subjected to hydroxymethylation, adding phenol into the product, and heating to make the product subjected to phenolate; and adjusting the pH value of the product by using sulfuric acid, and centrifugating, washing, depositing and drying to prepare the phenolic modified lignin. According to the method, the lignin is modified, so that the hydroxyl content in the lignin is increased, and the adsorption property of the lignin is improved; furthermore, after the lignin is modified, the solubility of the lignin in water is lower than that of the alkali lignin; and the phenolic modified lignin can be used as a heavy metal ion adsorbent.