35results about How to "Achieve specific adsorption" patented technology

The invention belongs to the technical field of preparation of adsorption and separation functional materials, and specifically relates to a method for preparing a porous adsorbent with high-density crown ether sites by surface photoinitiation; the steps are as follows: firstly, 2AM12C4 and PVBC are prepared; PVBC is added to the mixed solution of water and DMF, Add anhydrous Na after ultrasonic dissolution 2 S 2 o 3 , after washing in water bath, ethanol, and vacuum drying, PVBC‑S 2 o 3 , and then add 2AM12C4 into the quartz bottle, seal it, pass nitrogen gas and put it under the condition of ultraviolet light irradiation, in PVBC‑S 2 o 3 The graft polymerization of the monomer 2AM12C4 is initiated on the surface of the surface, and finally, PVBC-g-PCE is obtained by ethanol cleaning and vacuum drying; the present invention makes the base material itself have a large amount of chloromethyl groups by participating in the polymerization of 4-VBC, avoiding subsequent modification The phenomena such as unstable combination are caused, the preparation process is simplified, and the kinetic performance and adsorption capacity of the adsorbent are improved.

The invention discloses a basic orange II molecular imprinting solid-phase extraction filler, which is molecular imprinting polymer micro-particles which are prepared by taking basic orange II as template molecules, acrylamide as functional monomer, maleated rosin ethylene glycol acrylate as a cross-linking agent and azo-bis-iso-butyrynitrile as an initiator. The solid-phase extraction filler has a memory function to the stereo structure of basic orange II molecules, can realize the specificity, selective separation and enrichment of the basic orange II, is packed into the solid extraction column, can be used for detecting the selective separation, purification and enrichment of the basic orange II in sample extraction solution containing the basic orange II in foods, realizes high-sensitivity and high-selectivity detection for food samples containing the basic orange II, has stable recovery rate and small relative standard deviation and has the characteristics of simpler, quicker and more efficient operation and the like.

The invention discloses a magnetic polyimide composite material and its preparation method and application. The preparation method is to prepare amino-modified Fe in DMSO solvent 3 o 4 , Melamine and pyromellitic dianhydride are polymerized under high-temperature reflux, and the magnetic polyimide composite material can be obtained after washing and drying. The magnetic polyimide composite material synthesized by the method has the advantages of good dispersibility, large specific surface area, stable core-shell structure, simple and convenient synthesis method, low cost, repeatable recycling and the like. The covalent polyimide material bonded to ferric oxide can provide various forces such as π-π interaction, hydrophobic interaction, hydrogen bond interaction, weak cation exchange interaction, etc., so the material is suitable for some aromatic conjugated systems , Basic compounds have a strong adsorption.

The invention relates to a copper ion detection test paper and a method for detecting copper ions in water. The detection test paper attaches nano-titanium dioxide and hydrazine functionally modified diamino groups to the adsorption base layer to achieve specific adsorption of copper ions and further achieve pre-treatment. purpose of enrichment. The present invention also provides a method for detecting copper ions in water by using the copper ion detection test paper. The detection method does not require the participation of pretreatment process and large-scale instruments, and has fast detection speed, low cost, strong anti-interference ability, and low detection limit. The lower detection limit of the invention for copper ions can reach 30nM, and its saturated adsorption capacity can reach 4.964μg / cm2.

The invention discloses a preparation method of a mixed three-template molecularly imprinted solid-phase extraction column, which is prepared by using three template substances through the steps of dissolving, prepolymerizing, polymerizing, eluting the template substance, drying, and column packing in sequence. The preparation process is simple and easy to control. The prepared mixed three-template molecularly imprinted polymer has good stability, high strength, good uniformity, acid and alkali resistance, and specific adsorption efficiency for triazoles, pyrethroids and triazines. High, without grinding, can be directly packed into columns. The present invention also provides the application of the above-mentioned extraction column in the aspect of adsorbing triazoles, pyrethroids and triazines. The invention is suitable for preparing a mixed three-template molecularly imprinted solid-phase extraction column, and the prepared product can be further used for the purification and enrichment of samples in the multi-residue analysis of triazoles, pyrethroids, and triazines in food, feed, and other samples. set.

The invention provides a sandwich structure molecularly imprinted SERS substrate, and a preparation method and application thereof. The preparation method comprises the following steps: polymerizing gold nanoparticles on the surface of graphene oxide by using p-aminothiophenol as an intermediate agent; and polymerizing an upper molecular imprinting layer on the compound by taking a biguanide hypoglycemic agent as a template molecule, methacrylic acid as a functional monomer and ethylene glycol dimethacrylate as a cross-linking agent. The graphene oxide provides a good binding site for the molecularly imprinted polymer, the molecularly imprinted polymer has selective adsorption capacity, and the gold nanoparticles play a role in SERS enhancement. Compared with an existing detection technology, the preparation method has the following advantages: the sandwich structure molecularly imprinted SERS substrate MIP@Au-GO is obtained by adopting a mode of synthesizing polymers step by step, thesynthesis method is simple, the size, the number and the distance between the gold nanoparticles and target molecules are controllable, the adsorption efficiency is high, the detection effect is stable, and the application prospect is wide.

A use of CO 2 A method for the preparation of amidoxime-functionalized hollow porous polymer microspheres for emulsion templates. The invention belongs to the technical field of adsorption and separation functional materials, and relates to a CO 2 The method for preparing the amidoxime functionalized hollow porous adsorbent as an emulsion template; the steps are: first prepare silicon dioxide nanoparticles and MF-HP; add MF-HP and PEA to ethanol, react through ultrasound, water bath, wash with water, Washed with ethanol and dried to obtain MF‑NH 2 ‑HP, added to glutaraldehyde aqueous solution, after water bath, water washing, alcohol washing, and drying to obtain MF‑CHO‑HP, then add DAMN to ethanol solution, after water bath, water washing, alcohol washing, and drying to obtain MF‑CN‑HP , add hydroxylamine hydrochloride to a mixed solution of water and ethanol, after the reaction, wash with water, wash with alcohol, and dry to obtain MF-AO-HPS; the present invention provides the possibility for subsequent modification of a large number of action sites by grafting PEA, and hollow porous The combination of the structure not only improves the adsorption capacity of adsorbed U(VI), but also accelerates the mass transfer kinetics.

The invention discloses a preparation method and application of citric acid grafted chitosan pellets, belonging to the technical field of heavy metal adsorbents. The preparation method comprises the following steps: adding chitosan into the stirred CTAB solution, keeping the state of stirring, then adding citric acid, and mixing evenly to obtain a gel; pouring the obtained gel into a burette, and stirring it drop by drop drop into sodium hydroxide solution to collect wet gel balls; freeze-dry the obtained wet gel balls to obtain the citric acid grafted chitosan pellets. The pellets can greatly increase the adsorption capacity, have stronger selectivity to specific ions, can be applied to the removal and recovery of heavy metal elements, and can improve the stability of the pellets in water, and have good application prospects.

The invention discloses an organic electrochemical transistor sensor based on a molecular imprinted membrane, characterized in that a gate electrode of the organic electrochemical transistor sensor adopts a gold electrode modified with the molecular imprinted membrane, and the gate electrode is obtained by that an object to be detected is used as a template molecule, the template molecule is polymerized with a corresponding functional monomer by cyclic voltammetry to form a polymer membrane on the surface of the gold electrode firstly, and then the template molecule in the polymer template is eluted; and the gate electrode regulates and controls the channel current between a source electrode and a drain electrode through the solution of the object to be tested to constitute the organic electrochemical transistor sensor for selectively recognizing the object to be detected. The invention combines the molecular imprinting technique with the organic electrochemical transistor device, uses the specificity selection of the molecular imprinting technique and the signal amplification function of the organic electrochemical transistor sensor to recognize the specificity of the object to be detected, can selectively absorb the micro and even trace object to be detected, and has good selectivity, high sensitivity and low detection limit.