95results about How to "Achieve selective adsorption" patented technology

The invention relates to a quality chemical sensor using a functionalized mesoporous material as a sensitive material, and a manufacturing method and application thereof, and belongs to the field of micro-nano sensors. The sensor is characterized in that: an organic functionalized mesoporous material is used as the sensitive material, and a quality transducer is used as a sensitive detection platform. In the quality chemical sensor, preferential adsorption of specific target chemical molecules is realized by utilizing specific organic functional groups of the functionalized mesoporous material, the adsorption capacity of the sensitive material to the specific target chemical molecules is improved by utilizing the high specific surface area and porosity of the functionalized mesoporous material, and the adsorption of the functionalized mesoporous material to the specific target chemical molecules is converted into electrical signals to be outputted by utilizing the quality transducer so as to detect the specific target chemical molecules.

The invention discloses an imido magnetic nano-adsorbent. The adsorbent is formed by covalent cross linkage of magnetic nanoparticles and polyethyleneimine, wherein the magnetic nanoparticles mainly consists of nano ferroferric oxide, and a layer of gamma-Fe2O3 particles is coated on the surface of the magnetic nanoparticles. The invention correspondingly discloses a preparation method of the adsorbent. The preparation method comprises the following steps: preparation of the magnetic nanoparticles and covalent cross linkage. The invention further correspondingly discloses an application of the adsorbent in treating heavy metal wastewater. The magnetic nano-adsorbent has the advantage of stable magnetic property in the presence of strong acid and strong alkali, and can be easily and rapidly separated from a liquid phase, thus being suitable for various operating environments; and in addition, the adsorbent can be regenerated by simple acid or alkali treatment. The preparation method of the adsorbent has the advantages of simple process and low cost; and the adsorbent can be used for realizing selective adsorption (up to almost 100%) on zinc and lead in application to treatment of the heavy metal wastewater.

The invention discloses a porous reduced graphene oxide oil absorption material with a controllable doping level and a preparation method thereof. The porous reduced graphene oxide oil absorption material with the controllable doping level is of a hierarchical porous structure stacked layer by layer; a reduced graphene oxide aerogel is adopted as a substrate; and amino acid is doped in a framework of the reduced graphene oxide aerogel. The preparation method provided by the invention comprises the steps of firstly mixing graphene oxide and an amino acid reducing agent dissolving solution; then obtaining a reduced graphene oxide hydrogel through a high pressure hydrothermal method; and finally, washing the hydrogel, freezing at low temperature for pore-forming, and obtaining the porous reduced graphene oxide oil absorption material. The oil absorption material provided by the invention has favorable hydrophobicity, has a better adsorption capacity on an oil product and an organic pollutant, and achieves the aim of oil-water separation in an oil-water composite environment; and meanwhile, pore diameter distribution and a pore structure of the material can be regulated and controlled through the control on the doping level, the selective oil absorption of the material is promoted, and the selective adsorption of the oil product is realized.

The invention relates to the field of medical instruments, and in particular to an aids virus specific plasma adsorption column and an application method thereof. The aids virus specific plasma adsorption column comprises an adsorption column cavity and resin particles, wherein the resin particles are prepared from macroporous strong-alkalinity styrene anion exchange resin; a heparin lithium layer which is 0.5-1 mm thick is adhered to the inner wall of the adsorption column cavity; a plurality of adsorption holes are distributed in the resin particles; the aperture of each adsorption hole is 120.5 nm; the two ends of the adsorption column cavity are respectively communicated with a blood catheter. The aids virus specific plasma adsorption column and the application method thereof provided by the invention can realize selective adsorption, effectively clean the plasma of aids patients, greatly increase the survival rate of the aids patients, prolong and save the lives of the patients.

The invention provides preparation and a regeneration method suitable for large particle diameter activated carbon capable of adsorbing heavy metal ions. The activated carbon prepared by the method disclosed by the invention can achieve effective adsorption on metal ions in a liquid phase, technology in an activated carbon preparation process is simple, the activated carbon with better adsorptioncan be prepared without extra sulfonation treatment, and the technological process reduces cost; compared with a product of sulfonating the activated carbon or compared with a product which is not subjected to metal loading modification treatment and treated, the activated carbon has stronger adsorption capacity to metal ions. The activated carbon can be regenerated by the regeneration method, andthe adsorption capacity can be still kept at a higher level after the activated carbon is regenerated. The regeneration method has the characteristics of simple technological process, mild reaction condition, low preparation cost and the like. The regeneration method is especially suitable for the large particle diameter activated carbon capable of adsorbing heavy metal ions, and the regenerationmethod can achieve desorption of adsorbate in apertures of the activated carbon.

The invention discloses a preparing method of silicon inorganic flavone molecular imprinting microballoon in the separating purifying domain, which comprises the following steps: blending certain density mold agent solution and functional monomer according to rate; adding and refluxing to obtain former solution; blending ethyl silicate, alcohol, water and face activator evenly; adding ammonia to do catalytic reaction; adding former solution after reacting for a certain time; hydrolyzing for certain time continuously; filtering the hydrolytic product; drying in the sorbitic extractor; extracting through alcohol for a long time; drying again to obtain the product.

The invention relates to a preparation method of an interstitial boron doping titanium dioxide photocatalytic material and application. An interstitial boron doping TiO2 nanometer photocatalyst can beprepared by a low-temperature sol-gel method, wherein the interstitial boron ions have an effect of serving as Lewis acid sites on the catalyst surface, and the adsorption effect on Lewis alkaline phenol is greatly enhanced. Compared with the prior art, the preparation method disclosed by the invention has the advantages that adsorption of phenol in water can be effectively enhanced, the selective adsorption aim can be achieved by virtue of different chemical configuration adsorption effects, and finally the aim of rapidly oxidizing targeted pollutants is achieved by virtue of a photocatalytic oxidation technology. The method is simple, feasible, obvious in enhanced adsorption effect, high in selectivity and high in catalytic efficiency.

The invention relates to a method for preparing fatty acid molecular imprinted polymer, which comprises the following steps of: introducing a covalent bond to form a functional monomer of the molecular imprinted polymer; mixing template solution with certain concentration and the functional monomer according to a proportion, fully stirring, and refluxing to prepare precursor solution; and adding an initiator and a crosslinker, performing water bath for 24 h, grinding the product, sieving with a screen of 200 meshes, refluxing and extracting by using methanol-acetic acid solution for a long time, fully washing the obtained product by using ethanol, and drying to constant weight by using an oven at 60 DEG C to prepare the fatty acid molecular imprinted polymer. The fatty acid molecular imprinted polymer prepared by the method has the advantages of regular shape, high mechanical strength, high physiochemical performance, swelling resistance, good selective adsorption effect and the like, can be used under extreme conditions such as acid, alkali, high temperature and the like, is suitable for separating, purifying and enriching the fatty acid from complex matrixes such as water-soluble media, animal derived foods and the like, and has wide application prospect.

The invention discloses a flotation method for gold ore with a higher mining obturator content and aims to solve the problems of influence, caused by the fact that a dispenser is adopted in the traditional flotation process to eliminate an obturator medium, on the flotation environment, existence of adhesive foam and deterioration of the flotation environment. The flotation method comprises the steps of ore grinding, roughing, scavenging, primary concentration and second concentration, wherein during the ore grinding, an ore pulp pH regulator and a mining obturator inhibiter are added, a collecting agent and a foaming agent are added for adjusting the ore, the ore is stirred, the roughing and floatation operation is preformed, the ore pulp pH regulator is H2SO4, the mining obturator inhibiter is (NH4)2SO4, the foaming agent is terpenic oil, the collecting agent is Z-309 and Z-305. The surface characteristics of the ore are improved by reasonably combining and adding the agents, the mining oburator is better inhibited under the condition of lower ore pulp pH, the selective adsorption of the collecting agent on the targeted mineral, namely the gold ore, is enhanced, the gold content achieves 200-276.23g/ton, the gold recovery rate achieves 87.67-92.69%. The beneficiation method is simple in process and the on-site operation is easy.

The invention discloses a titanium-based metal-organic framework adsorption material, a preparation method therefor and an application in separation of palladium. The adsorption material is prepared from a titanium-based metal-organic framework and alginic acid. The invention further discloses two preparation methods for the adsorption material. The material prepared through an optimized preparation process has high adsorption rate to palladium ions and can be reused, the preparation process is simple, the reaction conditions are mild, and the production cost is low.

The invention discloses a UiO-66-NH2 composite material used for palladium adsorption. The composite material comprises a main component namely UiO-66-NH2 and a modifying agent namely alginic acid, wherein the UiO-66-NH2 is a zirconium based metal organic skeleton or a hafnium based metal organic skeleton. The invention also discloses a preparation method for the composite material. According to the invention, through exploration of a UiO-66-NH2 modification manner, the UiO-66-NH2 composite material provided by the invention has a novel application for palladium adsorption, and has significantadsorption effect.

The invention discloses a preparation method and application of a solid-phase microextraction fiber of a self-assembly multi-layer porphyrin organic frame compound, and belongs to the field of analytical chemistry and environmental chemistry. A stainless steel wire pretreated with aqua regia is sequentially modified with silicon hydroxyl and amino, and the porphyrin/porphyrin copper organic covalent frame compound modified solid-phase microextraction fiber is obtained by adopting a layer by layer self-assembly growth mode. A method for detecting the content of trace polycyclic aromatic hydrocarbon in water by the SPME-GC coupling technique is established, and an urban actual water sample is detected by the SPME-GC combined analysis, which discovers that the actual water sample can be effectively detected, and the home-made COFs material modified solid-phase microextraction fiber has a relatively good actual operation value.

A preparation method of a graphene quantum dot fluorescent probe for paraquat detection comprises the following steps: firstly, soaking oriental cherry leaves in absolute ethyl alcohol, stirring, centrifuging, taking supernatant, performing rotary evaporation to obtain chlorophyll, dispersing the chlorophyll in water, heating in a microwave oven, and finally dispersing the chlorophyll in ethyl alcohol to obtain the graphene quantum dot fluorescent probe with a red emission spectrum band. The maximum emission wavelength of the graphene quantum dot fluorescent probe is 630 nm, the maximum absorption peak position of a visible region of paraquat free radicals is also at the 630 nm position, the energy levels of a fluorescent probe donor and a paraquat free radical acceptor are overlapped, fluorescence resonance energy transfer occurs, and probe fluorescence quenching is caused. The probe is poor in effect when being used for comparing and detecting aquacide, cypermethrin, chlorpyrifos and glyphosate isopropylamino, however, the detection limit is 10<-9> mol.L<-1> when being used for high-selectivity recognition and high-sensitivity detection of paraquat free radicals. The preparation method is simple and easy to implement, high in selectivity, high in sensitivity and low in detection limit.

The invention discloses a method for preparing lactulose by directionally assisting lactose isomerization by using a phenylboronic acid-based polymer carrier and separating and purifying the product lactulose at the same time. The preparation method comprises the following steps: firstly, realizing directional selective adsorption of lactulose in a lactose isomerization system by utilizing a specific affinity adsorption effect between a phenylboronic acid functional group loaded by a phenylboronic acid-based polymer carrier and lactulose containing an ortho-position cis-hydroxyl structure, andpromoting an isomerization reaction to be carried out in the direction of generating lactulose; the conversion rate of the target product can be greatly improved, and the final lactulose yield can reach 65% or above. Meanwhile, the phenylboronic acid-based polymer carrier for directionally and selectively adsorbing lactulose can obtain a high-purity lactulose desorption solution through desorption operation, and the purity of the desorption solution can reach 95% or above.

The invention discloses a preparation method and application of a hollow composition template molecularly imprinted polymer micro-shell having a selective absorption effect on sulfanilamide and quinolone antibiotics. The preparation method of the micro-shell comprises the following steps: preparing polystyrene nano-particles, preparing a pre-assembly solution, preparing molecularly imprinted nanospheres, preparing a hollow polymer material, and removing template molecules. The hollow composition template molecularly imprinted polymer micro-shell prepared by the invention not only has the advantages of being good in molecular imprinted polymer selectivity, but also has the advantages of being large in absorption capacity, rapid in absorption rate, wide in application range and the like compared with other types of molecularly imprinted polymers. The preparation method of the hollow composition template molecularly imprinted material not only can solve the existing bottleneck problems ofthe molecularly imprinted material, but also can significantly broaden the selective absorption range of the hollow molecularly imprinted material, thereby widening the application range of the molecularly imprinted material.

The invention provides a temperature-pH responsive molecularly-imprinted fiber membrane and a preparation method thereof, belonging to the field of polymer functional materials. The preparation method of the temperature-pH responsive molecularly-imprinted fiber membrane comprises the following steps: preparing a nanofiber membrane from chitosan by using an electrostatic spinning technology, and then grafting a temperature responsive polymer poly(N-isopropylacrylamide-co-N-tert-butylacrylamide)-co-methacrylic acid on the surface of the nanofiber membrane through a free radical polymerization reaction. A prepared material has specific recognition capacity on dyes or heavy metal ions, the maximum adsorption capacity of the material on gentian violet dyes reaches 212.0 mg/g, adsorption equilibrium time is 7 min, and an desorption rate reaches 97%. The morphology of the fiber membrane is kept in a solution with a pH value of 6.0-14.0; the fiber membrane is dissolved in a solution with a pH value of 1.0-6.0; the molecular chain of a polymer brush is hydrophilic and is stretched when the temperature is lower than 32.5 DEG C; and the molecular chain is curled up and separated out from water when the temperature is higher than 32.5 DEG C. After adsorption is finished, pollutants can be easily and rapidly separated out due to temperature and pH responsiveness, so effective removal and enrichment of the pollutants are realized. The fiber membrane has a good application prospect in the aspects of environmental protection and water quality detection and analysis.

The invention relates to a preparation method of activated carbon capable of selectively adsorbing palladium (II) and belongs to the technical field of non-ferrous metallurgy. Since the activated carbon has relatively strong adsorptive property, the activated carbon is widely applied in various fields of industry and life, however, and due to poor selectivity, the application of the activated carbon in recovery of a metal is limited. Therefore, the invention provides a treatment method of the activated carbon so that the activated carbon can selectively adsorb palladium (II) in a hydrochloric acid medium. The treatment method comprises the following steps: chlorinating the activated carbon as a precursor with Cl2 at a high temperature so that carbon-chlorine bonds are introduced into the surface of the activated carbon and then treating the activated carbon with Na2S so that sulfur ether functional groups are introduced into the surface of the activated carbon. Sulfur ether is an effective extractant of palladium (II) and thus the treated activated carbon has selective adsorption to palladium (II).

The invention provides a stratified hydroxide composite material and a preparation method thereof, wherein the stratified hydroxide composite material is obtained by reacting a stratified hydroxide with sulfonatocalixarene. Compared with the prior art, the composite material of stratified hydroxide and calixarene provided by the invention has the advantages of high specific surface area, porosity and the like of the stratified hydroxide, and meanwhile, the composite material is also capable of realizing selective absorption for phenol organic materials by means of the unique cavity structure of the calixarene compound, and the hydrophily and hydrophobicity of the cavity and the side-chain substituent group.