245results about How to "Increase the adsorption rate" patented technology

The invention discloses arsenic removal material by adsorption of electrochemistry strengthened carbon fiber loaded nano ferro-manganese and an arsenic removal method by using the material. The material comprises a substrate material and nano ferro-manganese oxidesloaded on the substrate material through electrochemistry and electro-deposition; the substrate material can be carbon fiber yarns, carbon fiber felts or graphite carbon fiber felts, and the shape of the substrate material is cylindrical or flat-shaped; and when a three-dimensional electrode is used, the substrate material is activecarbon. The arsenic removal material is prepared by performing ferro-manganese metal salt surface electro-deposition on the substrate material by electrifying. The arsenic removal method comprises the following steps of: carrying out coupling electro-absorption in the process of arsenic removal by chemical absorption, and strengthening the arsenic removal effect by using the electro-absorption action of a charging capacitor in the absorption process; applying reverse current to facilitate arsenic desorption on a surface of ferro-manganese hydrated oxide in a regeneration process, and simultaneously applying high voltage to perform hydrolysis, hydrogen generation and oxygen evolution so as to facilitate activity regeneration of the ferro-manganese oxide. With the adoption of the material and the method, the high absorption effect and the quick regeneration capability can be achieved.

The present invention is granular electrode catalyst stuffing for 3D electrode reactor and its preparation process. The electrode catalyst stuffing consists of modified active carbon 60-70 wt% and film coating active carbon 40-30 wt%. The modified active carbon is prepared with active carbon through acid or alkali modification, oxidizing modification and metal supporting modification; and the film coating active carbon is prepared with active carbon through acid or alkali modification and soaking in cellulose acetate solution. The 3D granular electrode stuffing is used in waste water treatment, and has the advantages of great adsorption capacity, fast reaction speed, stable treating effect, etc.

The invention relates to a processing method of salt-free dyeing through activated dye, which includes the steps of: (1), acid pickling and enzyme washing of cotton fabric after the pretreatment of scouring and bleaching; (2) mixing water with organic solvent at volume ratio of (1:4)-(1:9) to form a mixed solution, and then adjusting the pH value of the mixed solution; and (3)dyeing the pretreated cotton fabric in 20-30 DEG C activated dye by using the mixed solution, then carrying out water scrubbing, acid pickling, soaping, hot-water scrubbing, color fixing and softening on the dyed cotton fabric, and finally recovering the solvent. With the processing method, the adsorption rate and the equilibrium adsorption amount of the activated dye are improved, and environmental and ecological problems caused when large quantity of inorganic salt is used are completely solved. In the dyeing process, the input of inorganic salt is omitted, so the operational techniques and the labor intensity in the dyeing process are effectively simplified and the production cost is reduced. Through a solvent recovery system, the solvent contained in the dyeing residue of the hydrosolvent is recovered for cycle use. Therefore, the recovery and the recycling of the resource are realized, the production cost is saved and the pollution to the environment is alleviated.

The invention discloses a carbon nano-tube / carbon multilevel pore spherical composite and a preparation method thereof. The preparation method comprises the following steps: firstly, pretreating a carbon nano-tube; adding the pretreated carbon nano-tube and a small amount of adhesive into deionized water to obtain a carbon nano-tube suspension; adding the carbon nano-tube suspension in a low-temperature liquid medium dropwise, rapidly solidifying to obtain a composite ice ball, rapidly transferring the composite ice ball into a freeze drier, and vacuum drying to obtain a carbon nano-tube initial composite globule; carrying out carbonization and strengthening on the carbon nano-tube initial composite globule to obtain a carbon nano-tube / carbon composite globule; and further carrying out activation on the carbon nano-tube / carbon composite globule to obtain the carbon nano-tube / carbon multilevel pore spherical composite. The carbon nano-tube / carbon multilevel pore spherical composite is provided with mesopores and micropores and is also provided with a macropore which penetrates through the surface and the spherical center and is high in specific surface area, large in pore volume and good in adsorption property.

The invention relates to a nitrogen-doped porous hollow carbon sphere carbon dioxide adsorption material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding SiO2 sphere flowers into mixed liquid of deionized water, absolute ethyl alcohol and ammonia water, and carrying out ultrasonic oscillation until the SiO2 sphere flowers are completely dispersed; and then adding a dopamine hydrochloride water solution, uniformly stirring at the room temperature, filtering, washing, drying, and processing at 700-900 DEG C for 2-4 hours in a N2 atmosphere so as to obtain nano-composite spheres; and finally impregnating the nano-composite spheres in hydrofluoric acid to remove the SiO2 sphere flowers, filtering, washing, and drying, so as to obtain the nitrogen-doped porous hollow carbon sphere CO2 adsorption material. The adsorption material is a porous hollow carbon sphere, the particle sizes of porous hollow nano-carbon spheres are about 400nm, the porous hollow nano-carbon spheres are uniform and regular, and the adsorption material has high nitrogen content, adsorptive property, specific surface area and pore volume and high-dispersed regular appearance, the surface of the adsorption material contains rich amino active sites, and the adsorption material can be applied to efficient adsorption of industrial CO2.

The present invention relates to the field of air purification materials, in particular to a preparation method for micro-nano silver loaded active carbon for eliminating formaldehyde for a long term under a room temperature condition. The present invention provides the preparation method for micro-nano silver loaded active carbon for eliminating formaldehyde for a long term under the room temperature condition. The preparation method comprises the following steps of active carbon washing, ammonia water impregnation modification and micro-nano silver loading. Compared with the prior art, the formaldehyde purification material provided by the present invention is prepared from the loaded micro-nano silver component by taking the active carbon washed by ultrapure water and treated by the ammonia water as a carrier; and by utilizing adsorption and reduction of the active carbon, catalytic oxidation performance of the micro-nano silver to the the formaldehyde and an enrichment conversion cooperation mechanism between the micro-nano silver and the active carbon, the micro-nano silver loaded active carbon is high in decomposition rate of catalyzing and oxidizing the formaldehyde and is stable in performance.

The invention provides a preparation method of a nitrogen doping carbon nanometer fiber adsorption material for carbon dioxide adsorption separation. The method is characterized by comprising the following steps of 1, at room temperature, firstly adding nitrogen-containing compounds into a solvent to be stirred for 1 to 5h to obtain a solution or dispersion solution; then, adding precursor polymers of the carbon nanometer fiber into the solution or the dispersion solution; performing stirring until the complete dissolution to obtain electric spinning raw materials; 2, performing electrostatic spinning on the electric spinning raw materials obtained in the first step, and obtaining nitrogen-containing hybridization nanometer fiber materials; 3, performing carbonization treatment; 4, performing activation treatment to obtain the nitrogen doping carbon nanometer fiber adsorption material for carbon dioxide adsorption separation. The carbon nanometer fiber adsorption material obtained by the method provided by the invention has the advantages of good adsorption volume, high selectivity and circulation stability; the prepared nanometer fiber has good softness and mechanical intensity; the operability is high; the carbon dioxide capture requirements in different discharging places can be met.

The invention relates to a novel composite water treatment material and a preparation method thereof. The novel composite water treatment material contains tourmaline, sepiolite and graphene oxide or graphene. According to the preparation method, the graphene or the graphene oxide is wrapped on the surfaces of the sepiolite and the tourmaline by a reflux method, so the adsorptive property of the sepiolite on organic wastewater can be effectively improved by utilizing the large surface area of the graphene or the graphene oxide. The novel composite material has the characteristics of high adsorption efficiency, small using amount, energy conservation and the like, in particular, the sepiolite and the tourmaline are almost not consumed, so the treatment cost can be greatly reduced, and the dangerousness that dye molecules belonging to organic matters difficult to degrade are immersed into natural water and accumulated in the environment is avoided. Meanwhile, the graphene oxide and the graphene have good antibacterial property, so the phenomenon that activated sludge is increased too fast can be effectively improved, and considerable economic benefit, environmental benefit and social benefit are achieved.

The invention relates to a method for removing mercury in flue gas by using chalcohalide compound modified absorption. The method is characterized in that: compound containing sulphur and halogen or its precursor is used as modifier for supported modification for adsorbent to make the surface mercury absorption characterization of absorbent change, The weight percentage of supported chalcohalide compound in absorbent is 0.01 to 10%, and the modified absorbent is connected with flue gas in flue gas filling and direct blowing-in manner direct for flue gas mercury removal. The modified absorbent is provided with high absorption capacity for mercury in flue gas, and mercury can be converted to stable mercuric sulphide by using the modified absorbent, as a result, the secondary pollution can be solved.

The invention discloses a gas-sensitive material for detecting NO2 and a method for manufacturing a gas-sensitive element made of the gas-sensitive material. The gas-sensitive material is prepared into a SnO2 nano-fiber with a rough surface and a hollow tubular structure by adopting an electrospinning method and high-temperature processing, the hollow SnO2 nano-fiber is of a rutile structure, the SnO2 nano-fiber diameter is about 250-300nm, and the thickness of a particle layer is about 40nm. Au particle modification is performed on the surface of SnO2 in an in-situ reduction manner without changing the crystal structure of SnO2. The specific surface area of the material is increased by the one-dimensional hollow nano-structure characteristic of the gas-sensitive material, the gas-sensitive performance of SnO2 is obviously improved by precious metal modification, and higher sensitivity to NO2 and a larger measurement range are presented. The obtained material is applied to the surface of a ceramic tube, annealing is performed, and a calcined ceramic tube core and a nickel-chromium heating wire are welded to a base, accordingly, the gas-sensitive element is manufactured.

The invention relates to a silica gel absorbent for absorbing heavy metal ions and a preparation method thereof, and discloses a preparation method of a N,N-di(phosphinemethyl) bis-substituted aminodithioformic acid functionalized silica gel absorbent and the adsorption effect of the absorbent on heavy metal ions such as cadmium, copper, nickel, lead, and the like. The preparation of the adsorbent comprises the following steps: reacting carbon disulfide with amino methane phosphonic acid, grafting the reaction products to the surface modified silica gel, and finally carrying out acidification. The synthesis conditions of the method are mild and efficient. The provided absorbent has a large adsorption amount and good selectivity on heavy metal ions such as mercury, copper, nickel, lead, and the like. Moreover, the metals can be recycled through a proper treatment, and the resources are regenerated and circularly used. The silica gel absorbent can be used to process and recycle wastewater containing heavy metals, can also be used to separate, enrich, and remove heavy metals in medicinal materials and environment analysis, and has a wide application prospect. The provided preparation method and prepared adsorbent will not generate secondary pollution to the environment.

The invention discloses a fibrous material with a formaldehyde removal function, and belongs to the technical field of poisonous volatile matter removal. Cation exchange fibers are used as base body materials in the fibrous material, and counting the total mass of the fibrous material by 100%, the fibrous material comprises, by mass, 24.8%-88.95% of the cation exchange fiber, 0.05%-0.2% of surface active agent, and 11%-75% of macromolecule organic amine compound. The preparation method of the fibrous material includes the following steps: (1) preparing steeping liquor according to proportion, (2) adding fibers into the steeping liquor and evenly stirring the fibers, (3) soaking the fibers in the steeping liquor for 2-4 hours under the condition of interval stirring, (4) and fishing out the soaked materials, drying the materials with hot air or natural air. The fibrous material is diversified in application form, has no secondary pollution, and is large in formaldehyde adsorption capacity, high in adsorption speed, simple in preparation process, and low in cost.

The present invention relates to the method and equipment for purifying drinking water. Electric field is applied to active carbon fiber filtering material, so that current will flow directly through active carbon fiber filtering material while water to be purified flows through the active carbon fiber filtering material, and under water is thus purified under the action of both electric field and flow field. Owing to the collision between pollutant and bacteria with active carbon fiber and direct current action on bacteria to destroy the cell membrane structure, the said method of the present invention can inhibit the growth of the bacteria and kill bacteria without throwing antiseptic.

Adsorbent compositions useful in adsorption and separation processes are made using silicone-derived binding agents. The adsorbent compositions are made from crystallite aluminosilicate particles bound with silicone-derived binding agents, and optionally small amounts of a clay binder, to form agglomerated crystallite particles and are calcined to volatilize the organic components associated with the silicone-derived binding agents. The agglomerated crystallite particles have superior pore structures and superior crush strengths at low binder concentrations and exhibit enhanced N2 adsorption rates and capacities when used in air separation processes.

The invention relates to a nano solid magnetic ion exchange resin ball and method for preparation, wherein the solid core is ferriferrous oxide nano particles, a layer of ion exchange resin particles is coated outside. The preparation comprises using ammonia as precipitation reagent, employing chemical co-precipitation method to prepare ammonia-containing functional groups on the Fe3O4 surface, under the activating action of carbodiimide, forming magnetic ion exchange resin of covalent bonds with polyacrylic acid.

The invention relates to a foaming-type industrial waste residue base compound dephosphorization material. Coal ash, steel slag and adhesive form gelation materials, foaming agent and water are added to form a compound dephosphorization material. The compound dephosphorization material comprises the following components by mass ratio of gelation materials: 75-85 percent of coal ash, 10-20 percent of 70-90 meshes of steel slag, 3-15 percent of adhesive, 0.2-1 percent of foaming agent and 3:1-9:2 of water. The material can protect the environment, realize reclamation of wastes and achieve good social and economic benefits.

The invention provides a chitosan-based adsorption agent capable of selectively separating heavy metal ions in the water environment and belongs to the technical fields of composite materials and water environment purification.Chitosan, 2-acryloylamino-2-methyl-1-propanesulfonic acid and acrylic acid serve as raw materials, N,N'-methylene bisacrylamide serves as a cross-linking agent, and the chitosan-based adsorption agent is prepared in one step in an aqueous solution through induced polymerization of glow discharge electrolysis plasmas.Experiments show that the prepared chitosan-based adsorption agent has high adsorption speed and high adsorption amount on Pb2+, Cd2+, Cu2+ and Ni2+ in water.Under coexistence of Pb2+, Cd2+, Cu2+ and Ni2+, the adsorption agent can be used for selectively enriching, separating and recycling Pb2+ in a mixed solution, and accordingly the adsorption agent has excellent performance of selectively separating lead in the water environment.Meanwhile, the adsorption agent can be used for desorption and reuse in an EDTA-4Na solution.

The invention relates to a method for preparing epichlorohydrin crosslinked chitosan / aminated carbon nanotube composite aerogel and specifically relates to a method for preparing composite aerogel bya freeze-drying method using chitosan and aminated carbon nanotubes as substrates and epichlorohydrin cross-linking and belongs to the field of functional materials. The aminated carbon nanotube can be used as a skeleton supporting material of the chitosan-based aerogel, effectively improves the mechanical strength of the chitosan-based composite aerogel and is easy to mold. The epichlorohydrin crosslinked chitosan / aminated carbon nanotube composite aerogel is lump and is easy to use and separate from water. The composite aerogel has a highly developed three-dimensional porous structure, goodmechanical strength and chemical stability, a U(VI) adsorption rate and adsorption capacity higher than those of the common resin and the highest adsorption capacity of 310 mg / g, realizes adsorption balance in 10min and is used for rapid and efficient separation and enrichment of uranium in uranium-containing wastewater.

The invention relates to a preparation method of a composite gel material which has excellent adsorption capacity of heavy metal ions, such as lead, cadmium, nickel, chromium, and molybdenum, and a phenolic compound, such as phenol, methylphenol, and xylenol, at the same time, is high in adsorption quantity and efficiency, and can be reused after washing, and relates to a product of the composite gel material. Attapulgite is subjected to water washing and acid washing, and is modified through a sodium chloride solution, hexadecyltrimethylammonium bromide, and a humic acid to prepare humic-acid-modified attapulgite. The humic-acid-modified attapulgite and acrylamide hydrogel are compounded to prepare the product of the composite gel material. The preparation method of adsorption macromolecule hydrogel is simple in process and low in cost, does not require any special equipment, and is easy for industrial application. The strength of the prepared gel is greatly improved.

An adsorption technology features that its system is composed of more than one adsorption tower and condenser. All the adsorption towers are parallelly connected to gas-material pipeline and each adsorption tower has a built-in cooler. Said adsorption technology includes condensing part of raw organic hydrocarbon, oil-water separation, flowing rest of organic hydrocarbon in adsorption tower, multi-layer adsorbing, cooling for optimal adsorption, switching to next adsorption tower while thermal regeneration for this adsorption tower, and introducing cooling gas to bed and cooling medium to cooler.

The invention belongs to the field of environmental protection materials and particularly relates to a graphene-based heavy metal ion adsorption material and a preparation method thereof. Polyvinyl alcohol, lignosulfonic acid and carboxymethyl chitosan as raw materials are doped with nitrogen-doped graphene and the mixture is cross-linked to form the heavy metal ion adsorption material utilizing a polymer material as a skeleton and enhanced by nitrogen-doped graphene. The heavy metal ion adsorption material has a fast adsorption rate, a large adsorption capacity and a fast regeneration rate. In the invention, polyvinyl alcohol, lignosulfonic acid and carboxymethyl chitosan are used as main raw materials and nitrogen-doped graphene is used as an accessory. After a cross-linking reaction of the materials, the product is activated by alkaline potassium permanganate. The preparation method has simple processes, is easy to operate and is suitable for industrial production. The preparation method utilizes cheap and easily available raw materials without toxic and harmful substances, reduces a production cost, does not produce toxic and harmful substances in preparation, can be used under mild reaction conditions, has low energy consumption and is environmentally friendly.

The present invention discloses a kind of spherical composite biolipid / polymer adsorbent for removing persistent organic pollutant from water and its preparation process, and belongs to the field of water treating technology and application. The acetone solution of biolipid and polymer material is dropped into condensing agent to form spherical adsorbent. The adsorbent has hydrophilic polymer film in the outer surface capable of reaching maximum exchange with solute in water solution, and hydrophobic biolipid embedded inside cellulose acetate polymer architecture to form several micro biolipid bank. The persistent organic pollutant in water is enriched via the micropores in the surface of the polymer film and adsorbed onto biolipid, so as to be removed.

The invention discloses a normal-temperature and normal-pressure preparation method and application of a metal selenide mercury adsorbent. The metal selenide mercury adsorbent is prepared at normal temperature and normal pressure by adopting a precipitation method. The metal selenide mercury adsorbent comprises a compound formed by selenium and one or more of chromium, manganese, iron, copper, cobalt, nickel, zinc, molybdenum, silver and cadmium and a composite of the compound, unstable mercury is converted into stable mercury selenide, mercury in industrial tail gas or by-products of fire coal, metallurgy, waste incineration, cement production and the like is removed, mercury enriched in mercury-containing articles for daily use is absorbed, the recovery and reutilization of mercury resources are realized, and mercury to be treated can exist in the forms of a simple substance state, a free state and / or a compound state and the like. As the metal selenide has extremely high mercury adsorption capacity and adsorption rate, realization of large-scale preparation of the metal selenide under normal temperature and pressure conditions has great significance on mercury pollution prevention and control, and the corresponding technology has wide market application prospects.

The invention relates to an activation and regeneration method for a metal sulfide mercury removal adsorbing agent. The activation and regeneration method comprises the following steps: moderately soaking a metal sulfide main body inside an activate fluid consisting of a cupric salt solution, and then separating, washing and drying to complete the activation for the adsorbing agent, and then usingthe adsorbing agent to adsorb mercury inside an airflow. After the adsorbing agent is inactivated due to adsorption and saturation for mercury, and the adsorbed mercury is released through thermal treatment, and resource recovery is carried out on the mercury. The adsorbing agent after thermal treatment is put in the activate fluid again for soaking to complete the regeneration of a metal sulfide. Compared with the prior art, besides the synthetic metal sulfide, low-cost natural metal sulfide ores can be directly used as the adsorbing agent main body. The mercury adsorption property of the metal sulfide can be greatly strengthened through activation, and simultaneously, the regeneration of the metal sulfide after mercury adsorption can be realized. The using amount of the adsorbing agentis greatly reduced while efficient trapping of flue gas mercury is realized, so that the consumption cost of the adsorbing agent and the implementation difficulty of adsorption mercury removal technology are reduced.

The invention discloses a modified silica gel air drying agent and a preparation method thereof, belonging to the field of utilization of silica gel. The preparation method comprises the following steps: (A) putting dried silica gel into a container, adding an aluminum chloride solution, fully oscillating and mixing the silica gel and the aluminum chloride solution, and controlling the reaction temperature of a water bath at 20-40 DEG C to obtain crude modified silica gel; and (B) drying the crude modified silica gel in an oven, after cooling to room temperature, putting the crude modified silica gel into a container, adding a zinc chloride solution, fully oscillating and mixing the silica gel and the zinc chloride solution, controlling the reaction temperature of the water bath at 20-70 DEG C, and after cooling to room temperature, taking out and drying to obtain the modified silica gel air drying agent. Compared with the unmodified silica gel drying agent, the absorbability of the modified silica gel drying agent of the invention is obviously improved. The modified silica gel air drying agent of the invention has the characteristics of high absorption capacity, quick absorption rate, easy desorption and regeneration and the like, and has great application and popularization prospects.

The invention discloses a calcium oxide-based high-temperature CO2 adsorbent and a preparation method thereof. The adsorbent comprises a carrier M and a main active component CaO loaded on the carrier M. The carrier M is further loaded with a structural stabilizing aid A. The general formula of calcium oxide-based high-temperature CO2 adsorbent is <x>CaO.A.<100-x-a>M, wherein x is the mass percentage of CaO; a is the mass percentage of A; x is no less than 5% and no more than 60%; and a is no less than 0.1% and no more than 50%. The calcium oxide-based high-temperature CO2 adsorbent in the invention has high wear resistance, high thermal stability and high activity; the adsorbent loses no more than 20% of CO2 adsorption capacity after 40 adsorption-desorption cycles and has a wear rate is 0.1 to 1 wt% / h; the adsorbent can be prepared by using individual impregnation solutions or a mixed impregnation solution; and the preparation method provided by the invention is simple in process, free of production of waste water, friendly to environment, easy to repeat and especially suitable for large-scale industrial production and application.

The invention discloses a preparation method and a using method of a magnetic response aminated cellulose-based heavy metal adsorption material. The preparation method comprises the following steps: S1, crushing cellulose and dissolving the crushed cellulose in an alkali urea solution under stirring state to obtain a transparent cellulose solution; S2, adding an animation reagent and a superparamagnetic material into the cellulose solution, uniformly mixing, then adding a cross-linking agent and grafting the animation reagent to a cellulose chain to obtain modified cellulose; and S3, converting the modified cellulose from liquid state into solid state by adjusting reaction temperature and pH value of a modified cellulose system to obtain the magnetic response aminated cellulose-based heavymetal adsorption material. The magnetic response aminated cellulose-based heavy metal adsorption material prepared by the method has high amino density and magnetic response, is capable of rapidly carrying out solid-liquid separation in an externally-applied magnetic field, has a good effect of removing various heavy metals in water, has good regeneration property, and can be applied to the fieldof treatment of wastewater with heavy metals.

The invention discloses a spongy bentonite-based composite adsorbing material and a preparation method thereof. The composite adsorbing material is prepared by the following steps of: proportioning, mixing and plasticizing extruding to obtain strip-shaped bentonite-based composite material extrudate with diameter of between 2 and 5mm; introducing the extrudate into water of room temperature and cooling; meanwhile, cutting the strip-shaped product into short columnar or strip-shaped products by using a shear; placing the products in water at the temperature of between 25 and 100 DEG C and soaking for 5 to 20 minutes so that the material absorbs water to be wetted; and placing in a tank of an air flow expanding machine, turning and heating the tank, opening a material port of the tank when the air pressure in the tank reaches 0.5 to 1.0MPa and releasing the air in the tank to obtain the composite adsorbing material. By using the material and the method, the pore size and the communication degree of granulated products compositely extruded from the bentonite and plastic are expanded, so that the adsorption capacity and the adsorption rate of the granulated products are obviously improved. The product of the invention is suitable for heavy metal ion-containing waste water treatment.

The invention belongs to the field of environmental protection materials and particularly relates to a heavy metal ion adsorption material and a preparation method thereof. The preparation method of the heavy metal ion adsorption material comprises that carbon nanotubes are added into polyvinyl alcohol, lignosulfonic acid and carboxymethyl chitosan as raw materials and the mixture is cross-linked to form a polymer skeleton. The carbon nanotubes are enhanced heavy metal ion adsorption materials. The heavy metal ion adsorption material has a fast adsorption rate, a large adsorption amount and excellent mechanical properties and can be fast regenerated. The polyvinyl alcohol, lignosulfonic acid and carboxymethyl chitosan as main raw materials and carbon nanotubes as auxiliary raw materials undergo a cross-linking reaction and then the reaction product is activated by alkaline potassium permanganate. The preparation method is simple, is easy to operate and is suitable for industrial production. The preparation method utilizes cheap and easily available raw materials so that a production cost is reduced. The raw materials are non-toxic and harmless. The preparation method does not produce toxic and harmful substances, is carried out under mild conditions, has low energy consumption and is environmentally friendly.

The invention relates to an MXene-based three-dimensional porous flexible self-supporting membrane, a preparation method thereof and an application of the membrane in electrochemical adsorption of dyes. The preparation method of the self-supporting membrane comprises the following steps that an MXene nanosheet suspension, a polystyrene microsphere suspension and a single-walled carbon nanotube suspension are mixed and stirred to be uniform, an obtained mixed solution is subjected to ultrasonic treatment, then vacuum filtration is conducted, so that an MXene / PS / SWCNTs composite film is obtained, and then, the polystyrene microsphere template is removed, so that the MXene-based three-dimensional porous flexible self-supporting membrane can be obtained. The self-supporting membrane obtained in the invention has a large pore volume and a high specific surface area, and can expose more active sites. The prepared self-supporting membrane is used for removing dye through electrochemical adsorption and has the advantages of being high in removal efficiency, easy to recycle, low in cost, easy to control and the like.