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

Belonging to the technical field of adsorption separation functional materials, the invention relates to a method for preparation of an amidoxime functionalized hollow porous adsorbent with CO2 as anemulsion template. The method includes: firstly, preparing silicon dioxide nanoparticles and MF-HP; adding MF-HP and PEA into ethanol, carrying out ultrasonic treatment and water bath reaction, and conducting washing, ethanol cleaning and drying to obtain MF-NH2-HP, adding the MF-NH2-HP into a glutaraldehyde aqueous solution, performing water bath, washing, alcohol washing and drying to obtain MF-CHO-HP, then adding the MF-CHO-HP and DAMN into an ethanol solution, performing water bath, washing, alcohol washing and drying to obtain MF-CN-HP, adding the MF-CN-HP and hydroxylamine hydrochlorideinto a mixed solution of water and ethanol, carrying out reaction, and then conducting washing, alcohol washing and drying to obtain MF-AO-HPS. By grafting PEA, the method provided by the invention provides possibility for subsequent modification of a large number of action sites, and combination with a hollow porous structure not only improves the adsorption capacity of adsorption U(VI), but alsoaccelerates the mass transfer kinetics.

The invention discloses a preparation method for a mixed three templates molecularly imprinted solid phase extraction column and application thereof, and the preparation method comprises the steps of performing dissolving, prepolymerization, and polymerization in sequence for the adopted three template substances, and eluting template substances, drying and filling a column to obtain the mixed three templates molecularly imprinted solid phase extraction column. The preparation process is simple, easy to control; a prepared mixed three templates molecularly imprinted polymer has good stability, high strength, good uniformity, acid and alkali resistance, high specific adsorption efficiency for substances such as triazole, pyrethroid and triazine, no need to grind, and can be directly filled to form the column. The invention also provides the application of the extraction column absorbing the substances such as the triazole, the pyrethroid and the triazine. The method provided by the invention is suitable for preparing the mixed three templates molecularly imprinted solid phase extraction column; a prepared product can be further used for purification and enrichment of samples when pesticide multi-residues of the triazole, the pyrethroid and the triazine in food, feed and other samples are being analyzed.

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 microfluidic chip with a microstructure array and a nucleic acid solid phase purification and extraction method. The microfluidic chip includes a microfluidic channel and a microstructure array distributed in the microfluidic channel. The microstructure array comprises a plurality of micropillars arranged in an array. The surfaces of the micropillars are connected to an adsorbent. The adsorbent is used for adsorbing nucleic acid. Compared with the prior art, the method utilizes the microfluidic chip with a microstructure array as a base, realizes adsorption and elution of nucleic acid through modification of the microfluidic channel interior with an agent for physical absorption of nucleic acid and has simple, fast and efficient operation processes. The microfluidic chip is easily integrated with a downstream nucleic acid amplification microfluidic chip so that a chip lab is constructed and is especially for on-site rapid detection.

The invention relates to a method for enriching vitamin K2 in natto bacillus fermentation liquid. The method comprises the following steps of step 1, performing centrifugation on the natto bacillus fermentation liquid, and collecting supernatant; step 2, adding a flocculant and a filter aid to the supernatant obtained in the step 1, then performing stirring, performing centrifugation, and collecting supernatant; step 3, adding Fe3O4@SiO2-G nanometer microspheres which are reduced to the supernatant obtained in the step 2, regulating the pH to 6.0-8.0, then performing stirring treatment under the condition of 20-35 DEG C for 10-30min, and then collecting magnetic materials after adsorption; and step 4, adding hexane to the magnetic materials after adsorption, performing ultrasonic parsing for 5-20min, then externally applying a magnet, collecting magnetic nanometer materials, pouring out organic phase, and performing filtering, wherein filtrate is a hexane solution rich in vitamin K2. According to the method for enriching vitamin K2 in natto bacillus fermentation liquid, the VK2 in the natto bacillus fermentation liquid can be quickly and efficiently enriched. The method has the advantages that the specific steps are simple, the materials are low in price, and can be reused, and the enrichment effect is efficient.

The invention discloses a preparation method of TNT magnetic molecularly imprinted polymer microspheres. The method comprises the steps of: firstly adopting 3-aminopropyltriethoxysilane to perform amination modification on surfaces of Fe3O4 nanoparticles, then dispersing the aminated Fe3O4 nanoparticles in acetonitrile, adding a template molecule TNT and functional monomer acrylamide, performing prepolymerization, adding a cross-linking agent ethylene glycol dimethacrylate and an initiator azobisisobutyronitrile so as to prepare magnetically imprinted polymer microspheres, and finally performing elution treatment on the microspheres to obtain the TNT magnetic molecularly imprinted polymer microspheres. By combining technologies of molecular imprinting with magnetic separation, the preparedpolymer particles have a uniform shape and uniform size, the specific surface area of the TNT molecularly imprinted polymer microspheres is increased, and good adsorption and separation performance are achieved, wherein the adsorption amount is about 2.6 times that of a traditional embedding method, the separation time is about 1/5 of that of the embedding method, and specific adsorption of TNT is achieved.

The invention relates to copper ion test paper and a method for testing copper ions in water. According to the test paper, nano titanium dioxide and hydrazine functionally-modified diamino groups are attached to an adsorption substrate, so that specific adsorption of the copper ions is realized, and preconcentration is realized. The invention further provides the method for testing the copper ions in the water by the aid of the copper ion test paper. With the adoption of the testing method, the pretreatment process and large instruments are not required, the testing speed is high, the cost is low, the anti-interference capability is high, and the testing limit is low; the lower testing limit value of the method for the copper ions can reach 30 nM, and the saturated adsorption amount can be up to 4.964 mu g/cm<2>.

The invention provides application of an H-Beta type molecular sieve in NPs detection or adsorption and a method for simultaneously detecting eight NPs, and relates to the technical field of analysis and detection. According to the method, the H-Beta type molecular sieve is adopted as an adsorbent of the neonicotinoid pesticide (NPs) in the sample pretreatment process, and specific adsorption of the NPs in a sample can be achieved, so that the accuracy, precision and sensitivity of detection of the NPs in water and honey are improved; the repeated utilization rate of the H-Beta type molecular sieve is high, and the requirements of rapidness, accuracy, saving and good repeatability in pretreatment and detection of eight NPs samples in a sample to be detected can be met. The detection is carried out through high performance liquid chromatography-tandem mass spectrometry detection. The method provided by the invention can realize accurate detection of eight trace NPs, the detection limit of NPs in water is less than 0.1 ng/mL, and the detection limit of NPs in honey is less than 2.0 ng/g.

The present invention relates to a MAF-stu-13 material having an ultra-microporous dia-a network topology, the chemical formula is {[Zn (MIBA) 2]} n, n is a non-zero natural number, and MIBA is 4-(2-methylimidazole) benzoxy; the material belongs to a tetragonal crystal system and a P4nc space group, has a one-dimensional pore channel in the c-axis direction, and has excellent thermal stability andchemical stability. The MAF-stu-13 can be rapidly synthesized in a large scale, a solution that a general MOFs material is difficult to synthesize in a large scale is provided, and the material synthesis process comprises the steps that metal zinc salt, ligand HMIBA and a DMF solvent are placed in a pressure-resistant bottle in a certain proportion and sealed, and heating and stirring are conducted for 1 h at the temperature of 120 DEG C through a solvothermal reaction. The MAF-stu-13 material with the ultra-micropore dia-a network topological structure can specifically adsorb Bz in a Bz andCH mixed solution, the Bz is eluted from a frame, the purity of the Bz is up to 99.4%, and therefore liquid-phase adsorption separation of Bz/CH is achieved. While the MAF-stu-13 is able to extract anamount of Bz from commercially pure CH. The MAFstu13 is capable of specifically adsorbing Bz and is based on a synergistic effect of size exclusion and supramolecular binding.

The invention discloses Sudan red I molecularly-imprinted solid phase extraction padding. The Sudan red I molecularly-imprinted solid phase extraction padding refers to molecularly-imprinted polymer particles which is prepared in a way that Sudan red I is taken as a template molecule, acrylamide is taken as a function monomer, maleated rosin glycol acrylate is taken as a cross-linking agent, and azoisobutyronitrile is taken as an initiating agent. The solid phase extraction padding has a memory function on a three-dimensional structure of a molecule of the sudan red I, the specificity, the selective separation and the enrichment of the sudan red I are realized, the padding is filled so as to form a solid phase extraction column, and the solid phase extraction column is used for detecting the selective separation, purification and the enrichment of the Sudan red I in an extraction solution containing a sudan red I food sample; and the high sensitivity and high selectivity detection on the food sample containing the sudan red I is realized, and the method provided by the invention has the characteristics of being high in recovery ratio, small in relative standard deviation, simple and rapid to operate, high in efficiency and the like.

The invention belongs to the technical field of adsorption separation functional material preparation, and particularly relate to a method for preparing a high-density crown ether site porous adsorbent by surface photo initiation. The method includes the following steps that first, 2AM12C4 and PVBC are prepared and obtained; the PVBC is added into a mixed liquor of water and DMF, water-free Na2S2O3 after ultrasonic dissolution is added, and water bath, ethanol cleaning, and air drying are conducted to obtain PVBC-S2O3 which is added into a quartz bottle with the 2AM12C4, after being sealed, nitrogen is introduced under ultraviolet irradiation, the grafting polymerization of the monomer 2AM12C4 is initiated on the surface of the PVBC-S2O3 and at last, ethanol cleaning, and air drying are conducted to obtain PVBC-g-PCE; and a substrate material contains a large amount of chloromethyl group through participation of 4-VBC in polymerization, the unstable combination caused by subsequent modification is avoided, preparation processes are simplified, and the dynamic performance and adsorption capacity of the adsorbent are improved.

The invention belongs to the technical field of biological materials, and particularly relates to a blood purification adsorbent and a preparation method and application thereof. The blood purification adsorbent comprises an inner core with mesopores and macropores, a first outer modification layer distributed in the mesopores of the inner core, and a second outer modification layer distributed inthe macropores of the inner core, wherein the inner core comprises a porous carbon-based material and a porous titanium-based material, the first outer modification layer comprises polyvinyl alcohol,porous zinc oxide and porous tantalum oxide, the second outer modification layer comprises polyethylene glycol and medical macromolecules containing hydroxyl groups, and the ratio of the number of the hydroxyl groups to the number of carbon atoms in the medical macromolecules is not less than 1: 5. The blood purification adsorbent has good mechanical strength, adsorption performance and biocompatibility, and can adsorb pathogenic factors in blood or plasma.

The invention provides a curcumin-based molecularly imprinted polymer preparation method, which comprises: mixing curcumin, an organic solvent and water to obtain a mixed solution; mixing magnetic Fe3O4 nanoparticles, zein and the mixed solution, and carrying out auto-polymerization to obtain an initial polymer; and cleaning the initial polymer to remove curcumin so as to obtain the curcumin-based molecularly imprinted polymer. The invention further provides an electrochemical sensor based on the molecularly imprinted polymer of curcumin and application based on the electrochemical sensor. The electrochemical sensor provided by the invention is based on specific adsorption of the molecularly imprinted polymer, so that the electrochemical sensor has high efficiency, rapidness and accuracy when being used for detecting curcumin.

The invention discloses a naphthyl polyimide magnetic compound and its preparation method and application. The naphthyl polyimide magnetic compound includes magnetic Fe ₃ o ₄ The inner core and the SiO wrapped in turn outside the core ₂ layer and a naphthyl polyimide layer, the naphthyl polyimide layer contains benzene rings, C=O, C-N, C-C and C=C bonds. In the present invention, the magnetic naphthyl polyimide polymer is bonded to the surface of magnetic nanoparticles through a covalent bond, and a composite material with multiple acting forces is prepared, and the naphthyl polyimide bonded to ferric oxide The amine material can not only provide the necessary specific surface area and pore structure as an extraction material, but also has a large number of conjugated benzene rings, which can have π‑π stacking and hydrophobic interactions with Sudan red molecules; the residual carboxyl groups can Hydrogen bonding occurs with the hydroxyl group in Sudan Red. The compound of the invention has large specific surface area, uniform pore size distribution, and can realize specific adsorption for some polar substances and substances with aromatic conjugated systems.