83results about How to "Adsorption equilibrium time is short" patented technology

The invention discloses a reduction-oxidation graphene-Fe3O4 nano composite, a preparation method thereof, and an application of the reduction-oxidation graphene-Fe3O4 nano composite in absorbing bisphenol A. The reduction-oxidation graphene-Fe3O4 nano composite comprises Fe3O4 nano particles and reduction-oxidation graphene. The reduction-oxidation graphene-Fe3O4 nano composite and a solution containing the bisphenol A are in full contact in an ambient temperature, the bisphenol A is absorbed and removed. Compared with the prior art, the advantages of small material dose, simplicity in operation, mild processing condition, fast processing speed, and no harm for the environment, and recycling nano-composite materials, and the like are achieved.

The invention discloses a 5A molecular sieve adsorbent for adsorptive separation of distillate containing n-alkane and a preparation method of the 5A molecular sieve adsorbent. The preparation method comprises the following steps: adding polyquaternary ammonium salt serving as a crystallization synthetic soft template agent into a sol system formed by mixing a silicon source with an aluminum source, and carrying out hydrothermal synthesis to obtain a hierarchically porous 4A molecular sieve with a microporous-mesoporous structure; after the 4A molecular sieve is subjected to soft template agent removal, carrying out roll forming on the treated 4A molecular sieve and a binder to obtain small balls with particle sizes of 0. 2 to 0.8mm; drying, roasting and then carrying out calcium ion exchange and activating to obtain the 5A molecular sieve adsorbent with the microporous-mesoporous structure, wherein the proportion of a 5A molecular sieve in the adsorbent is 90 to 97 weight percent, and the proportion of the binder is 3 to 10 percent. The preparation method of the adsorbent, provided by the invention, has the advantages that a diffusion coefficient of the n-alkane in the molecular sieve is remarkably improved while the synthesized hierarchically porous 5A molecular sieve maintains higher equilibrium adsorption capacity for the n-alkane, thereby increasing the rate of adsorptive separation.

The invention relates to a preparation method of a COF / GO (covalent organic framework / graphene oxide) adsorbent and application. A covalent organic framework material COF-TpPa-1 is loaded onto the surface of graphene oxide GO by an in-situ synthesis method, so that the COF / GO adsorbent is obtained. The method can ensure that the COF-TpPa-1 is tightly combined with the GO. The GO is a novel carbonaceous adsorbent, while the COF has a large specific surface area and light density and can serve as a good adsorbing material, and moreover, oxygen-containing functional groups existing on the surfaceof the COF enable the COF to have potential adsorption capacity. The number of active adsorption sites of the GO is increased by the COF / GO adsorbent, the adsorption property of hexavalent chromium ions Cr(VI) is enhanced by a synergistic effect, moreover, the requirement of reaction in the loading process is low, and the preparation method is easy to operate and convenient to carry out. Therefore such a COF / GO adsorbent material has a broad application prospect in the fields of material preparation and environment.

The invention relates to mesoporous adsorbent resin with a uniform pore size and a large specific surface area, which has a brown spherical structure. The particle size is 0.3-1.0mm, and the pore size is 5-10nm. The preparation method comprises the steps of: dissolving polyvinyl alcohol in water to prepare an aqueous phase; mixing benzoyl peroxide as an initiator, a total monomer phase made via mixing of styrene and divinylbenzene as a crosslinking agent, a pore making agent with mixture of methyl cyclohexane and toluene to prepare an oil phase; and adding the aqueous phase into the oil phase to prepare matrix resin; adding xylene dichloride (XDC) and ferric chloride for reaction after swelling, filtering to obtain resin, cleaning and drying to obtain the target product. The invention has the advantages that: the specific surface area of the adsorbent resin is large, the pore size is concentrated in the mesoporous area, resin holes are distributed uniformly and have the single peak characteristics, the capacity for adsorption of relatively large dye molecules is high, and the equilibrium of adsorption can be achieved faster. The process of the preparation method is simple, the cost is low, and the preparation method has broad prospects for application in dye wastewater treatment.

The invention discloses a method for preparing an Fe3O4@ZrO(OH)2 magnetic nano-adsorbing material for high-efficient fluoride removal from drinking water. The method comprises the following steps: (1) preparing magnetic nano-Fe3O4 microspheres by using a coprecipitation method; and (2) adding the magnetic nano-Fe3O4 microspheres and deionized water into a reaction vessel; adding a certain amount of solution of zirconium salt dropwise into the reaction vessel under the condition of mechanical stirring; adding the solution of NaOH into the reaction vessel dropwise; and separating and washing by utilizing an externally-applied magnetic field after heating, refluxing and reacting for 1 to 3 hours so as to obtain the magnetic nano-Fe3O4@ZrO(OH)2 composite microspheres. The method has the following advantages that: 1, adsorption capacity is large, so the method is suitable for advanced treatment of large volume of drinking water; 2, the removal speed is high, and the adsorption paths of nano-particles are short; and 3, the preparation is simple because the overall preparation process has no need of complex reaction process, special reaction equipment or harsh reaction temperature, the operation is simple and easy to implement, and the reproducibility is high.

The invention provides alpha-ketoglutaric acid modified magnetic chitosan. The alpha-ketoglutaric acid modified magnetic chitosan contains ferroferric oxide, chitosan and alpha-ketoglutaric acid and has the saturated magnetization value of 20-25emu / g, wherein magnetic chitosan is prepared from ferroferric oxide and chitosan, modified magnetic chitosan is of a reticular structure, peak values of functional groups, such as Fe-O bonds and the like, appear in an infrared spectrogram, and an agglomeration phenomenon is expressed. A preparation method of the alpha-ketoglutaric acid modified magnetic chitosan comprises the steps of adding an acetic acid solution containing chitosan into a ferroferric oxide suspension, adding a sodium tripolyphosphate solution, reacting and separating, so as to obtain the magnetic chitosan; then, adding alpha-ketoglutaric acid into an acetic acid buffer solution containing the magnetic chitosan, adding a sodium borohydride solution, and separating, thereby obtaining the alpha-ketoglutaric acid modified magnetic chitosan. The alpha-ketoglutaric acid modified magnetic chitosan has stable physical and chemical properties and strong magnetism; during the treatment of wastewater containing cadmium ions, the treatment efficiency is high, and the alpha-ketoglutaric acid modified magnetic chitosan can be repeatedly used and is convenient to recover.

The invention provides an amidoximated mesoporous silica microsphere adsorbent. According to the invention, sodium silicate is used as a main raw material for synthesis of the adsorbent via a microwave hydrothermal method, and since sodium silicate is far cheaper than ethyl orthosilicate, production cost can be effectively reduced; reaction time can be substantially shortened to 12 to 18 h by using microwave hydrothermal synthesis, so production efficiency is enhanced; moreover, microwave hydrothermal synthesis can promote spontaneous nucleation and enables nucleation to be more uniform; furthermore, a functional group (an amidoxime group) is introduction via copolycondensation for modification of the adsorbent during microwave hydrothermal synthesis of the mesoporous silica microsphere adsorbent, so the prepared amidoximated mesoporous silica microsphere adsorbent has a well-developed ordered mesoporous structure and good mechanical strength and chemical stability, facilitates rapid entry of uranium into pore channels for adsorption and is applicable to separation and recovery of uranium in uranium-containing waste water.

The invention discloses a renewable modified activated carbon adsorbent and a preparation method thereof. The renewable modified activated carbon adsorbent is prepared from the following components: 4-8% of a molybdenum disulfide / carbon nanotube composite material, 3-5% of magnetic nanoparticles, 5-15% of diatom ooze, 6-12% of bentonite and the balance of activated carbon. The preparation method comprises the following steps: modifying the modified carbon nanotubes, adding the modified carbon nanotubes into water to form a dispersion liquid, adding soluble molybdenum salt, thiourea and a surfactant, magnetically stirring, carrying out vacuum heat preservation at 160-190 DEG C for 18-20 hours, cooling, filtering, washing and drying to obtain a molybdenum disulfide / carbon nanotube compositematerial; uniformly mixing the composite material with the other raw materials, ball-milling, washing and drying, and then carrying out vacuum calcination at 200-250 DEG C for 1-2 h. The adsorption capacity of the renewable modified activated carbon adsorbent on heavy metal ions in industrial wastewater greatly exceeds adsorption capacity of current commercial activated carbon.

The invention provides a method for removing heavy metal lead ions from a water mass by absorbing with sodium alginate-hydrotalcite-graphene gel balls. The method comprises the following steps of adding the sodium alginate-hydrotalcite-graphene gel balls into the water mass which contains the heavy metal lead ions, and vibrating to absorb the heavy metal lead ions. Unsaturated ions and chemical groups, such as carboxyl and hydroxyl, which have lone electron pairs, are on the surface of sodium alginate, on one hand, ion exchange reaction occurs between the unsaturated ions of the sodium alginate and the lead ions, and on the other hand, complexation occurs between the groups, such as carboxyl and hydroxyl on the surface of sodium alginate and the lead ions. As oxidized grapheme is added into the sodium alginate, the mechanical strength and tenacity of the gel balls are improved, functional groups which can be reacted with the metal ions, in the adsorbent are also increased, and the removal rate of the method is higher than that of the method for removing lead by sodium alginate gel balls. The method provided by the invention is simple in step, convenient in operation and high in practicability.

The invention provides an SnS2 nanosheet as well as a preparation method and an application thereof. The SnS2 nanosheet with both high adsorption and a high visible light catalysis degradation property is prepared with simple chemical liquid phase synthesis method. The preparation technology is simple and low in cost. The SnS2 nanosheet which can be applied to both adsorption and visible light degradation has the advantages of high adsorption, short adsorption equilibrium time, high visible light catalysis degradation efficiency, high degradation rate, environment-friendliness and the like.

The invention belongs to the technical field of preparation of specific separation functional materials, and relates to a preparation method and an application of a covalently-modified high-density crown ether functionalized porous adsorbent. The preparation method comprises the following steps: preparing a porous polymer PVBC and a glycidyl methacrylate surface-grafted porous polymer recorded asPVBC-g-PGMA; mixing the PVBC-g-PGMA with DMF, and adding 2AB12C4 after the PVBC-g-PGMA is dispersed in the DMF; and carrying out a water bath reaction, sequentially washing the obtained product with DMF, ethanol and double distilled water, and performing vacuum drying to obtain the porous adsorbent modified with aminoethylbenzo-12-crown-4. The prepared porous adsorbent effectively improves the adsorption capacity and the mass transfer efficiency, solves the problems of low density and deep embedding of acting sites of existing lithium adsorbents, and provides a new idea for the development ofefficient lithium adsorbents.

The invention discloses an n-alkane adsorption and separation adsorbent and a preparation method thereof. The preparation method comprises the following steps: adding amphiphilic organosilane used as a soft template into a silicon source and aluminum source mixed sol system, and hydrothermally synthesizing a hierarchical porous 4A molecular sieve with a microporous-mesoporous structure; and removing the soft template from the 4A molecular sieve, rolling the soft template removed 4A molecular sieve and a binder to form small spheres with the particle size of 0.2-0.8 mm, drying and calcining the small spheres, carrying out calcium ion exchange and activation to obtain the 5A molecular sieve adsorbent with a microporous-mesoporous structure. The adsorbent comprises 90-97 wt% of 5A molecular sieve and 3-10 wt% of the binder. The hierarchical porous 5A molecular sieve synthesized in the invention keeps high equilibrium adsorption quantity to n-alkanes, and substantially improves the diffusion coefficient of the n-alkanes in the molecular sieve, so the adsorption and separation rate is improved.

The present invention belongs to the technical field of environmental materials, and discloses a modified slag adsorbent for anion dye wastewater treatment, and a preparation method thereof. The preparation method comprises: washing, drying, crushing and screening slag; preparing a sodium chloride solution, and mixing the sodium chloride solution and hydrochloric acid to obtain a mixed solution; and slowly adding the mixed solution to the slag, carrying out a stirring reaction, standing, drying, and grinding to obtain the modified slag adsorbent. According to the present invention, the preparation method has characteristics of simpleness, rich raw material source, low price, and waste recycling; after the modification, the micro-pores of the slag are increased, the specific surface area is increased, and the adsorption capacity of the adsorbent is further enhanced; and the adsorbent of the present invention has the good anion dye wastewater treatment effect, has the high equilibrium adsorption capacity, and especially has the good Acid Green 27 adsorption effect.

The invention belongs to the field of biomass charcoal adsorption materials, and discloses a camellia oleifera shell carbon powder material. A preparation method comprises the following steps: crushing camellia oleifera shells, mixing the obtained camellia oleifera shell powder with water; performing ultrasonic treatment and stirring, performing hydro-thermal treatment on anobtained mixed solution, drying to obtain carbon powder, mixing and grinding the obtained carbon powder and KOH, performing heating roasting treatment on the obtained mixed powder under the protection of argon atmosphere, cooling to room temperature, washing with water to be neutral, and drying anobtained product to obtain the camellia oleifera shell carbon powder material. The camellia oleifera shell carbon powder material disclosed by the invention is simple in preparation process, economical in raw materials and applicable to large-scale production, has the characteristics of short adsorption equilibrium time andhigh adsorption capacity in a tetracycline wastewater purification process, and has the advantages of easiness in recovery, stable chemical property and no toxic or side effect.

The invention discloses a preparation method for a magnetic magnesia adsorbent for adsorbing polycyclic aromatic hydrocarbons from environment water samples and an application of the magnetic magnesia adsorbent. The magnetic adsorption material is a composite of ferric oxide and magnesia. The preparation method comprises the steps of adding super-paramagnetism ferroferric oxide nanoparticles into a precursor solution of magnesia as heterogeneous seed crystals, carrying out self-assembly and aging so as to obtain precipitates, and carrying out high-temperature calcination on the precipitates, thereby obtaining magnetic magnesia microspheres with the grain size of 5 to 10 microns. The preparation method provided by the invention is simple, rapid and environmentally friendly and is low in cost; and the prepared material is used for removing the polycyclic aromatic hydrocarbons from water as an adsorbent and has the advantages that the adsorption rate is high, the adsorption capacity is high, the separation is easy, the selectivity is good, and the like.

The invention provides polyamidoxime functionalized hyperbranched nano-diamond. The nano-diamond has a structural formula as shown in the specification, wherein R is nano-diamond, h is an integer more than or equal to 0, and i, j, k, m and n are integers more than 0. The method for preparing the polyamidoxime functionalized hyperbranched nano-diamond comprises the following steps: (1) preparing polyglycerol functionalized nano-diamond; (2) preparing polyacrylonitrile functionalized nano-diamond; and (3) preparing the polyamidoxime functionalized hyperbranched nano-diamond. The polyamidoxime functionalized hyperbranched nano-diamond can be used for solving the problems that an existing porous material adsorbent has low uranium selectivity and low adsorbing speed, and an existing amidoxime functionalized adsorption material cannot take high uranium selectivity and high adsorption capacity into consideration under the condition of a low pH range.

The invention provides a preparation method of a defluorination composite fiber membrane, which comprises the following steps: carrying out electrostatic spinning by using polyvinylidene fluoride andchitosan as spinning raw materials to prepare a composite fiber membrane, and treating the obtained composite fiber membrane in a Ca<2+>-containing calcium source solution to obtain the defluorinationcomposite fiber membrane. The invention also provides the defluorination composite fiber membrane, and application, an activation method, and a regeneration method thereof. The defluorination composite fiber membrane provided by the invention has better adsorption performance and good regeneration performance, can be recycled for a long time, greatly saves the cost, and can be suitable for treating fluorine-containing water bodies in various fields and in various scales. The preparation method has the advantages of accessible raw materials, low cost and simple technique, and is suitable for large-scale industrial production and use.

The invention provides an anhydride modified passion fruit peel bio-adsorbent and a preparation method and application thereof, and belongs to the technical field of environmental functional materialsand water pollution control. According to the invention, the passion fruit peel is used as a raw material and contains a large amount of cellulose, hemicellulose, lignin and different functional groups such as hydroxyl, carboxyl and the like, so that the passion fruit peel has very strong adsorption performance on dye molecules in water. Through anhydride modification, more carboxyl groups are introduced, so that the adsorption performance of the adsorbent on cationic dyes and heavy metal ions can be improved. The succinic anhydride modified passion fruit peel bio-adsorbent prepared by the preparation method has a very good adsorption effect on methyl violet and methylene blue, high adsorption capacity and strong reproducibility, and the prepared maleic anhydride modified passion fruit peel bio-adsorbent has a good adsorption effect on various heavy metals, wherein the adsorbent has a very good adsorption effect on Pb < 2 + > and Cd < 2 + >, relatively high adsorption capacity and relatively short adsorption equilibrium time.

The invention provides novel chelating resin and a method for absorbing cadmium ions with the same. A preparation method of the novel chelating resin includes the steps that firstly, chloromethyl polystyrene resin is soaked in N,N-dimethylformamide serving as a reaction solvent till the chloromethyl polystyrene resin is fully swelled; secondly, 2-mercaptothiazoline serving as a ligand and sodium serving as a catalyst are added into the product obtained in the first step, and are stirred and react for 12 hours at the temperature of 110 DEG C under the condition of nitrogen protection, and the mass ratio of 2-mercaptothiazoline to -CH2Cl matter in the chloromethyl polystyrene resin is 3:1; thirdly, the product obtained in the second step is filtered to obtain a filter cake, the filter cake is soaked and washed with the reaction solvent till a cleaning solution is colorless, then the product is washed with distilled water and then washed sequentially with anhydrous ethanol, acetone and diethyl ether for several times, vacuum drying is conducted at the temperature of 50 DEG C, and the novel chelating resin is obtained. The novel chelating resin has the advantages of being capable of selectively adsorbing the cadmium ions in an aqueous solution, good in adsorption performance, capable of being repeatedly used and the like.

The present invention discloses a chelate fiber, a synthetic method thereof and a method for enriching hexavalent chromium from serpentine. The synthetic method of the chelate fiber includes: 1) soaking a matrix of grafted acrylic polytetrafluoroethylene fiber in toluene for 12-14 h; 2) adding a ligand to the products obtained in the step 1), and reacting while stirring at 30-50 DEG C for 11-14 h, wherein the ligand is 2-amino-1,2,4-thiadiazole, and the molar ratio of the matrix to the ligand is 1:2-6; and 3) filtering the products obtained in the step 2), washing the filter cake, and drying to a constant weight to obtain the chelate fiber MATF with selective adsorption on Cr (VI). The chelate fiber MATF synthesized by the invention has high efficiency selective adsorption on Cr (VI).

The invention provides a modified nonwoven fabric capable of quickly adsorbing heavy metal ions. The modified nonwoven fabric comprises a substrate and a modifier, wherein the surface of the substrateis loaded with a modifying agent; the substrate comprises a nonwoven fabric; the modifying agent comprises a copolymer of catechol monomer and polyamine monomer. The modified nonwoven fabric capableof quickly adsorbing the heavy metal ions and the preparation method have the advantages that the contact area of the modified nonwoven fabric is large, the adsorption amount of heavy metals is high,the adsorption is quick and effective, and the good repeated use effect is realized; the preparation method is simple and effective, the cost is low, the operation is simple, and the pollution and destroy to environment are avoided.

The invention discloses a reagent for circularly repairing cadmium pollution of a rice field and a preparation method of the reagent. Comprising the following components in parts by weight: 10-15 parts of humic acid, 5-10 parts of biochar, 15-20 parts of a repairing fungicide, 5-10 parts of montmorillonite, 10-15 parts of agricultural and forestry wastes and 1-5 parts of mineral salt. The reagent prepared by the invention can effectively reduce the content of heavy metals in farmland, especially the content of cadmium, and does not cause harm to soil texture.

The invention discloses a multi-stage pore 5A molecular sieve adsorbent for n-alkane adsorption separation and a preparation method thereof. The preparation method comprises adding a long-chain double biquaternary ammonium salt as a soft template agent into a silicon source-aluminum source mixed sol system, carrying out hydrothermal synthesis to obtain a microporous-mesoporous structure multi-stage pore 4A molecular sieve, removing the soft template agent in the 4A molecular sieve, rolling to mold the 4A molecular sieve and a binder so that small particles having diameters of 0.2-0.8mm are obtained, carrying out drying and calcination, and carrying out calcium ion exchange and activation to obtain a microporous-mesoporous structure multi-stage pore 5A molecular sieve, wherein a ratio of the 5A molecular sieve in the adsorbent is 90-97wt% and a ratio of the binder is 3-10%. In the preparation method of the adsorbent, the multi-stage pore 5A molecular sieve has a high equilibrium adsorption capacity of n-alkane, improves a diffusion coefficient of the n-alkane in the molecular sieve and improves an adsorption separation rate.

The invention relates to a sponge-supported porphyrin covalent organic framework integral material as well as a preparation method and application thereof, and the method comprises the following steps: meso-tetra (4-aminophenyl) porphyrin and 2, 3-dihydroxy terephthalaldehyde or 2, 5-dihydroxy terephthalaldehyde are used as initial raw materials, in a reaction solvent, a glacial acetic acid solution is used as a catalyst, and the sponge-supported porphyrin covalent organic framework integral material is obtained through a one-step reaction. Performing ultrasonic treatment on the mixture, adding pretreated dry sponge, sealing the reaction container, performing heating reaction, cooling to room temperature after the reaction, filtering to obtain precipitate of a crude product, and washing and drying the precipitate to obtain the product. The sponge-supported porphyrin covalent organic framework material disclosed by the invention realizes dual functions of specific optical recognition and efficient adsorption of heavy metal ions (such as Cd < 2 + >).

The invention relates to a preparation method and application of an acidic mordant black T-barium sulfate adsorption material. The acidic mordant black T-barium sulfate adsorption material is darkbrown and compounded by a framework made from barium sulfate, barium chloride or barium nitrate and acidic mordant black T serving as a clathration material; the preparation method comprises the following steps of: mixing barium salt (such as barium chloride, barium nitrate and the like) and sulfuric acid or sulfate in aqueous solution for reaction; depositing and separating to prepare an acidic mordant black T-barium sulfate compound material; and adding 0.2 to 2 percent of the material serving as a heavy metal absorption agent into heavy metal waste water, so that the acidic mordant black T-barium sulfate compound material has a good heavy metal absorption function. By using the acidic mordant black T, an organic and inorganic hybrid material with the heavy metal absorption function can be prepared; and the organic and inorganic hybrid material has the advantages that: the price of the raw materials is low, the preparation method is simple, the absorption speed is high, the adsorption capacity is high, various types of heavy metal can be absorbed and the like. The acidic mordant black T-barium sulfate adsorption material can be widely applied to treatment of heavy metal pollution and dye waste water.

The invention provides a preparation method of modified illite adsorbent for removing naphthol green B. The preparation method includes the following steps that illite ore is smashed, screened and ground, then the illite ore is mixed with cetyltrimethylammonium bromide to be prepared into a mixed solution, then heating is performed, hydrochloric acid is dropwise added to adjust the pH value, standing and activating are performed after constant-temperature stirring, then the mixed solution is placed in an oven to be heated for 20-25 h at the temperature of 75-85 DEG C till the solution is completely dry, and the finished adsorbent is obtained. The process of preparing the adsorbent is simple, and reaction conditions are mild. The prepared adsorbent has high adsorbing capacity on negation ion dye in water, and time for achieving adsorption balance is short. The adsorbent is a good adsorption material for processing anionic dye in waste water.

The invention belongs to the technical field of electrochemical immunosensors, and particularly relates to a graphene magnetic nanoelectrode, an electrochemical immunosensor, a production method and an application. The production method of the graphene magnetic nanoelectrode comprises the following steps: cleaning a gold electrode; and modifying the surface of the gold electrode with a Graphene / Fe3O4 nano composite material, airing at room temperature to form a film to obtain a modified electrode, and sequentially soaking the modified electrode in nano gold sol for 4-6 hours, 0.01-100 ng.mL <-1 > alpha fetoprotein antibody solution for 9-12 hours and 0.25 wt% bovine serum albumin solution for 30-45 minutes. According to the invention, a magnetic nano-composite constructed by graphene is constructed on the surface of the gold electrode, and the electrochemical immunosensor is produced based on the graphene magnetic nano-electrode. The electrochemical immunosensor is high in sensitivity, strong in antibody adsorption capacity, wide in detection concentration range and suitable for detection of immune protein.

The invention relates to a method for preparing a Clenbuterol surface molecularly imprinted material. The method is characterized by comprising the following steps of: (1) activating silica gel; (2) bonding the double bond of the silica gel; (3) performing surface chemical grafting on the silica gel; and (4) preparing a product. The invention also discloses application of the surface molecularly imprinted material to the detection of Clenbuterol residues. Compared with the prior art, the method has the advantages that: the preparation process of the Clenbuterol surface molecularly imprinted material is simple and high in operability, and preparation cost is low; and the surface molecularly imprinted material is high in specificity, short in Clenbuterol adsorption balance time and elution time and good in elution effect.

The invention discloses a reduction-oxidation graphene-Fe3O4 nano composite, a preparation method thereof, and an application of the reduction-oxidation graphene-Fe3O4 nano composite in absorbing bisphenol A. The reduction-oxidation graphene-Fe3O4 nano composite comprises Fe3O4 nano particles and reduction-oxidation graphene. The reduction-oxidation graphene-Fe3O4 nano composite and a solution containing the bisphenol A are in full contact in an ambient temperature, the bisphenol A is absorbed and removed. Compared with the prior art, the advantages of small material dose, simplicity in operation, mild processing condition, fast processing speed, and no harm for the environment, and recycling nano-composite materials, and the like are achieved.

The invention belongs to the field of metal inorganic oxide adsorption material, and discloses nanometer carbon coated cobaltous oxide, and a preparation method and applications thereof. The preparation method comprises following steps: citric acid and cobaltous acetate are dissolved in water through ultrasonic treatment, an obtained mixed solution is dried to be a colloid, the colloid is subjected to roasting treatment at Ar / H2 mixed atmosphere protection through heating to 400 to 500 DEG C, the temperature is reduced to room temperature through cooling, and an obtained product is subjected to grinding to obtain the nanometer carbon coated cobaltous oxide. The preparation process is simple; the raw materials are economical; the preparation method is suitable for large scale production; the obtained nanometer carbon coated cobaltous oxide is short in adsorption balance achievement time in removing of tetracycline, and high in adsorption capacity; and recycling can be realized, and is convenient.