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 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 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 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 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 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 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 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.