40 results about "Polymer adsorbent" patented technology

The invention belongs to the technical field of polymer adsorbent materials, and particularly relates to an ionic polymer adsorbent material containing sulfonic groups and triazinyl, a preparation method and application thereof. A sulfonic acid group is introduced to a molecular structure unit of the nitrogen-rich polymer, and the specific surface area and the ion capacity of the polymer are controlled by adjusting the content of benzidine disulfonic acid; along with the increase of the proportion of benzidine disulfonic acid, the ion capacity of an adsorbent is gradually increased, the specific surface area is gradually reduced, the invention also discloses application of the ionic polymer containing sulfonic acid and triazinyl structure in dye adsorption, and the prepared polymer has high specific surface area, heat-resistant stability, adsorption performance and adsorption regeneration performance.

The invention relates to new carbon dioxide adsorbents based on modified weak base anion exchange resins (WBAERs) comprising a crosslinked polymeric backbone containing appended primary and / or secondary amines. The WBAERS materials are insoluble in water and common organic solvents, have surface areas of 5-50 m2 / g, and can be in either bead or powder form. The WBAER materials are suspended in water or a polar organic solvent and treated with haloalcohol or halohydrin compounds to effect the modification. The modified materials exhibit significantly improved oxidative stability compared with the unmodified ion-exchange resins without much impact on their CO2 uptake capacity or CO2 uptake kinetics. The modified materials remain insoluble in water and common organic solvents and, therefore, are not susceptible to leaching under steam-based or moisture-based sorbent regeneration conditions.

The invention discloses a hydrated polymer adsorbent based on saponin embryo modification as well as a preparation method and application thereof, and belongs to the technical field of environmental functional materials. The adsorbent is a three-dimensional network structure material which is prepared by acylating and modifying saponin embryos through maleic anhydride, then carrying out graft copolymerization on the modified saponin embryos, diacetone acrylamide and glycidyl methacrylate, and carrying out crosslinking through N, N-dianilino tetrahydrofuran. The preparation method mainly comprises the following steps: firstly, carrying out acylation reaction on saponin seed embryo dispersion liquid and maleic anhydride under an alkaline condition to obtain acylated saponin seed embryos; then carrying out graft copolymerization with two functional monomers in a hydrogen peroxide-acetylacetone initiation system, and finally adding a cross-linking agent to complete a cross-linking reaction. The molecular chain of the prepared adsorbent is rich in various functional groups such as acylamino, carboxyl and epoxy group, and the adsorbent has efficient adsorption capacity on heavy metal ions and oil pollutants in water, and is large in adsorption capacity and good in stability.

The invention discloses novel lignan in Chinese starjasmine stem as well as an extraction method and application of the novel lignan. The novel lignan extract in the Chinese starjasmine stem is obtained by crushing the Chinese starjasmine stem, soaking the Chinese starjasmine stem in methanol, carrying out vacuum concentration, carrying out macroporous resin adsorption, eluting, carrying out Sephadex LH-20 gel column chromatography, carrying out silica gel column chromatography and carrying out ChiralCore Cel-J chromatographic column separation. The lignan compound can inhibit the expression of IL-1beta and IL-6 in RAW 264.7 cells induced by lipopolysaccharide (LPS), and shows potential anti-inflammatory activity. The extraction method is simple, stable, reliable, convenient to operate and low in production cost, the novel lignan compound with the unique chemical structure can be extracted, and the novel lignan compound is high in purity, small in dosage of harmful reagents, low in toxicity and suitable for industrial production.

The invention belongs to the technical field of preparation of ion identification, adsorption and separation functional materials, and discloses a preparation method and adsorption application of a functional bowl-shaped structure inherent microporous polymer adsorbent AO-PIM-1 (at) mSiO2. The adsorbent comprises a mesoporous silica mSiO2 hard template and an inherent microporous polymer PIM-1 self-polymerized on the surface of the mesoporous silica mSiO2 hard template, and is prepared through amidoxime functionalization. According to the preparation method, an mSiO2 hard template is adopted, PIM-1 is self-polymerized on bowl-shaped mSiO2, and then amidoxime functionalization synthesis is carried out. The adsorbent has a hierarchical porous structure, a high specific surface area and abundant amidoxime functional groups, and shows strong affinity and high selective adsorption performance on uranyl ions UO2 < 2 + >. Compared with the prior art, the adsorbent provided by the invention not only solves the problems of low selectivity, structural collapse or efficiency reduction after recycling and the like of a porous polymer adsorbent, but also provides an efficient new strategy for the fields of uranium extraction and separation from seawater due to excellent structural stability and renewability of the adsorbent.

The application discloses a kind of photoresponsive cation covalent organic framework materials and its preparation method and application in rhenium adsorption and photocontrol desorption, belong to polymer adsorbent and scattered noble metal recovery technical field.The photoresponsive cation covalent organic framework material introduces the double pyridinium structure unit that can occur photoinduced electron transfer in framework, under the condition that no specific light irradiation stimulus is applied, the double pyridinium structure unit maintains cationic state, to realize the adsorption of ReO4 ‑ By electrostatic interaction and anion exchange effect;Under light irradiation, the charge of double pyridinium structure is reduced, and the adsorbed ReO4 ‑ Desorption in pure water system.After desorption, the material is treated by oxidation and heating to restore the cationic structure, realizing cyclic regeneration.The application constructs adsorption-desorption system based on photoresponsive charge regulation mechanism, without strong eluent, with the characteristics of mild operation, good controllability and high cycle stability, suitable for green separation and recovery of rhenium resources.

The application discloses a 2,4-dinitrophenol / Pb (II) double-template imprinted polymer adsorbent and a preparation method thereof. The double-template imprinted monolithic adsorbent is prepared by using in-situ polymerization technology, 2,4-dinitrophenol and Pb (II) are used as imprinting templates, 4-vinylpyridine and dimethylaminopropyl acrylamide are used as functional monomers. The functional monomers and the templates are effectively combined through hydrogen bond action and coordination action, and then a porogen and a crosslinking agent are added to react to form a polymer. The double templates are eluted, and a three-dimensional cavity structure with specific recognition function is left. The specific binding sites and shapes on the cavity are used to realize selective extraction of NP S and Pb (II). Meanwhile, the prepared double-template imprinted adsorbent has the advantages of simple operation, good permeability, low cost and wide application range, and therefore the double-template imprinted polymer monolithic adsorbent prepared by the application has good practical application value.

This invention provides a method for recovering rare earth elements from lutetium yttrium silicate crystal waste and its application. The method includes the following steps: mixing lutetium yttrium silicate crystal waste with an alkaline substance for alkali fusion, followed by water leaching and acid leaching to obtain an acid leaching solution; mixing the acid leaching solution with an inorganic polymer flocculant and an alkaline solution for preliminary desiliconization to obtain a first desiliconized solution; mixing the first desiliconized solution with a phosphorus-based extractant for extraction to remove impurities, obtaining an extract and a raffinate; performing deep desiliconization on the raffinate using resin adsorption or heteropolyacid extraction to obtain a second desiliconized solution; mixing the second desiliconized solution with a precipitant solution for precipitation to obtain a precipitate product, and then calcining the precipitate product to obtain rare earth oxides. This method can reduce the silicon content to below 1 mg / L, comprehensively recover rare earth elements such as Y and Lu, effectively reduce acid and alkali consumption, improve the comprehensive utilization rate of waste materials, and increase economic benefits.

This invention provides an improved depth filtration medium with reduced extractant for DSP filtration and clarification applications. Furthermore, it provides an improved depth filtration medium that is compatible with gamma irradiation-based filter sterilization processes. [Solution] A depth filtration medium is provided for clarifying the recovered material from a feed stream of a cell culture containing therapeutic biomolecules. The depth filtration medium is composed of a sintered mixture of a polymer adsorbent and a thermoplastic binder, has extremely low extractability, and does not require pre-washing before use. Furthermore, the constituent materials used in the sintered depth filter medium exhibit high stability to gamma rays and are compatible with gamma-based pre-use sterilization processes.

The invention discloses an adsorbent material for perfluorinated compounds in water and a preparation method and application thereof, and belongs to the technical field of water treatment materials, 1, 3-diamino-2-hydroxypropane, m-tribenzoic acid and 3, 3 '-(1, 4-phenylene) bis [2-propiolic acid] are used as raw materials to react to obtain a polyamide polymer, and finally the polyamide polymer is hydrolyzed to remove the m-tribenzoic acid to obtain the perfluorinated compounds in the water. The polymer adsorbent material is prepared; the adsorbent material for the perfluorinated compounds in the water, prepared by the invention, has a relatively large specific surface area and adsorption capacity, can be used for adsorbing the perfluorinated compounds in the water, has relatively strong mechanical stability, long service life and regeneration capacity, and has a good application prospect in the aspect of removing the perfluorinated compounds in the water.

The invention provides a preparation method and application of a porous material for wastewater purification based on a cationic super-crosslinked polymer. According to the invention, a cationic monomer 1-benzyl-3-methylimidazole chloride salt is introduced into a biphenyl benzyl chloride framework, a cationic super-crosslinked polymer is prepared through a Friedel-Crafts alkylation reaction, and the super-crosslinked polymer adsorbent has good adsorption performance on an anionic organic pollutant methyl orange; the adsorbent is a potential adsorbent for removing anionic organic pollutants in a water environment; compared with a pure biphenyl-dichlorobenzyl hyper-crosslinked polymer, the HCP-BCMBP-BMC has the advantages that due to the introduction of an ionic monomer, the electrostatic interaction force is increased, and the adsorption capacity on methyl orange is improved; the ionic super-crosslinked polymer HCP-BCMBP-BMC (1: 1) has the best methyl orange adsorption performance, adsorption equilibrium can be achieved within 20 min, and the adsorption capacity is 374 mg / g.

The present application relates to the technical field of natural product separation, in particular to a compound separated from gerbera kikuchii, a preparation method and application thereof, the preparation method of the compound comprising the steps of alcohol extraction from gerbera kikuchii, resin adsorption separation, column chromatography and gel separation. The compound disclosed by the present application can be used for preparing a RAW264.7 cell inhibitor.

The invention discloses a thickened oil development method for breaking through a fireflooding interlayer based on a combustion improver with stratum adsorbability. Selecting a heavy oil reservoir, identifying and confirming a low-permeability interlayer area, and delimiting a target injection area and an injection well group; injecting a combustion improver composition with stratum adsorbability into the interlayer area, and after adsorption is completed, implementing front air pre-injection to activate and catalyze the oxidation capacity of the combustion improver; an ignition agent is continuously injected through the gas injection well to initiate an in-situ combustion reaction; gas injection is maintained, parameters such as combustion temperature and product components are monitored, and stable propulsion of the combustion front edge is controlled. The combustion improver composition comprises an oxidant, a combustion improver, an inorganic catalyst, a catalyst with stratum adsorbability, an emulsifier / surfactant, a polymer adsorbent, a solvent and a pH regulator. The stratum adsorbability of the combustion improver is improved, the combustion improver is enriched at the adsorption site of the interlayer part, high-temperature and high-pressure reaction is generated after ignition, the interlayer structure is broken through, and heat channel breaking through and stable combustion wave propelling are achieved.

The invention discloses a preparation method and application of a high-capacity MOFs (Metal-Organic Frameworks) boron affinity imprinted macroporous polymer adsorbent. The preparation method comprises the following steps: by taking a macroporous polymer as a carrier, uniformly distributing boron affinity imprinting recognition sites on hyperbranched CNCs through an atom free radical polymerization surface molecular imprinting technology by virtue of hydrophilic CNCs and polyethyleneimine PEI; the preparation method comprises the following steps: carrying out a grafting reaction on PEI and an initiator, carrying out a solvothermal reaction, and compounding with two-dimensional MOFs nanosheets, so as to prepare MCNCs-PEI (at) Y-Br-MIPs capable of stabilizing a W / O Pickering high internal phase emulsion; and finally, synthesizing the target adsorbent HPs (at) MCNCs-PEI (at) Y-Br-MIPs based on an emulsion microreactor. When the two-dimensional MOF nanosheet is used for selectively separating NRG, the defects that a traditional two-dimensional MOF nanosheet is low in selectivity and low in recognition site grafting efficiency are effectively overcome. The novel hybrid two-dimensional nanosheet disclosed by the invention has excellent emulsifying performance and high specific surface area, and meanwhile, a large number of boron affinity imprinting sites are introduced; the adsorption contact time is shortened by the three-dimensional macroporous structure of the columnar polymer, and rapid mass transfer, ultrahigh specific adsorption and high-selectivity recognition are realized by matching with abundant pore channels and a good specific surface area.

The present application belongs to the technical field of adsorbent materials, and particularly relates to a kind of amidoxime-based polymer adsorbent material and its preparation method and application.The present application uses tannic acid and tetrafluoro-p-xylylene dinitrile as raw materials, forms precursor polymer with three-dimensional network cross-linking structure through cross-linking reaction, introduces amidoxime group through amidoxime reaction, and obtains amidoxime-based polymer adsorbent material.The present application realizes high selective coordination capture of gold ions by introducing amidoxime group;in-situ reduction of gold ions is realized by using tannic acid phenolic hydroxyl group;high stability of the material under harsh environment is endowed by using fluorine-containing rigid cross-linking skeleton.The material can directly complete selective adsorption, in-situ reduction and elemental gold recovery of gold from complex electronic waste leaching liquor in one step, omits elution and additional reduction steps in traditional process, and has the advantages of simple process, high efficiency, good selectivity, low cost, green environmental protection and the like.

The invention discloses a preparation process of a kudzuvine root active ingredient extraction-protection integrated sustained-release microcapsule. Firstly, supercritical carbon dioxide extraction is combined with a macroporous resin adsorption step-by-step extraction technology, effective components are efficiently extracted and enriched from radix puerariae, and damage to the structure of the active components in the extraction process is reduced to the maximum extent. Loading the enriched radix puerariae extracting solution into a sodium alginate-chitosan composite hydrogel microcapsule core, and coating the outer layer of the sodium alginate-chitosan composite hydrogel microcapsule core with sodium alginate to form a compact shell layer, so as to prepare the microcapsule preparation with slow release performance and gastric acid degradation resistance. The microcapsule is stable in a simulated gastric acid environment, the release duration of effective components in an in-vitro release experiment is relatively long, and the active components can be prevented from being damaged by gastric acid and can be slowly released in intestinal tracts.

The invention belongs to the field of adsorption separation functional materials, and discloses a preparation method of a hollow polyhedral oligomeric silsesquioxane nano adsorbent and application of the hollow polyhedral oligomeric silsesquioxane nano adsorbent in selective adsorption of precious metal gold ions. According to the preparation method, an MOF material UiO66-NH2 is taken as a hard template, a POSS-Bpy covalent organic polymer shell layer is constructed on the surface of the hard template in situ, and then the internal template is removed through acetic acid etching, so that the hollow polymer adsorbent HPOSS-Bpy with a clear and stable structure is successfully constructed. The material has high specific surface area, proper pore size distribution and rich nitrogen coordination adsorption sites, and the selective adsorption capacity to Au (III) is remarkably improved. The adsorbent not only shows excellent Au (III) recognition performance in a system in which multiple metal ions coexist, but also has good regeneration cycle stability and adaptive capacity in an actual electronic waste liquid environment. The method is simple in process and environmentally friendly, and the prepared material is stable in structure, excellent in performance, suitable for efficient separation and recovery of gold ions in complex systems such as electronic waste and the like and good in application prospect.

The invention discloses a method for adsorbing rhodium and iridium by using phosphorus-containing polymer adsorption resin, and particularly relates to a method for enriching rhodium and iridium before purifying rhodium and iridium from precious metal enriched concentrate, which comprises the following three steps: preparing phosphorus-containing porous polymer adsorption resin, selectively adsorbing rhodium and iridium, and desorbing and recycling to realize rhodium and iridium adsorption. Subsequent purification of rhodium and iridium is facilitated. Compared with traditional resin adsorption, the phosphorus-containing high-molecular adsorption resin is a functionalized high-molecular material, combines the characteristics of traditional adsorption resin and the advantages of phosphorus-containing compounds, and has pertinence and high efficiency in the aspect of rhodium and iridium metal adsorption. The rhodium and the iridium are rare and expensive metals, so that the two noble metals are recovered through the adsorption effect of the phosphorus-containing polymer, and the method has important significance on efficient utilization of secondary resources and maximization of economic benefits.

This invention discloses a modified alumina nanoparticle and a modified composite adsorbent, as well as their preparation method and application, belonging to the field of polymer adsorbent technology. The modified alumina nanoparticle preparation method is as follows: (1) Alumina nanoparticles are added to a dispersion medium, ultrasonically treated, the supernatant is removed, and more dispersion medium is added; (2) A silane coupling agent is added, the mixture is stirred, washed, and dried to obtain the final product. The modified composite adsorbent includes an oil phase and an aqueous phase; the preparation method is as follows: (1) An oil phase is obtained; (2) A suspension is formed; (3) An aqueous phase is obtained; (4) The oil phase is added to the aqueous phase, stirred, aged, cooled, washed, and dried to obtain the final product. In an acrylate-based polymerization system, this invention introduces modified alumina nanoparticles to chemically modify the material surface, increasing the density of surface active sites and enhancing the specific capture ability of chlorinated organic compounds, thereby achieving rapid capture and selective separation of chlorinated hydrocarbons in the oil phase.

A polymer resin oil removal device includes a resin adsorption tank, an oil-water separation tank, and an intermediate storage tank. The resin adsorption tank has a second inlet pipeline at its bottom and a first outlet pipeline at its top. The second inlet pipeline and the first inlet pipeline are connected. The first outlet pipeline is connected to a flushing water pipeline. The resin adsorption tank is fixed to a support base. Support plates are located at its upper and lower ends inside the tank, and water caps are mounted on the support plates. A polymer oleophilic resin is placed between the two support plates to form a polymer oleophilic resin filling area. The oil-water separation tank has a second outlet pipeline at its bottom, which is connected to the first outlet pipeline. The resin adsorption tank is also equipped with differential pressure calculation and heating components. The intermediate storage tank is connected to the bottom of the resin adsorption tank via a pipeline. This polymer resin oil removal device can treat oily water online and has regeneration capabilities.

The invention discloses preparation of an ion imprinted polymer adsorbent and application of the ion imprinted polymer adsorbent in preparation of battery-grade lithium dihydrogen phosphate. The method comprises the following steps: firstly, preparing Fe3O4 coated SiO2 by taking nano Fe3O4 as a magnetic core and tetraethoxysilane, and then carrying out imprinting polymerization on lithium dihydrogen phosphate as a template and a mixed functional monomer under the action of a cross-linking agent to obtain a crude product; and finally, eluting the template to obtain the magnetic ion imprinted polymer adsorbent. The adsorbent can be used for specifically adsorbing lithium dihydrogen phosphate ions from low-concentration lithium, high-impurity brine or a lithium chloride solution, the application process of the adsorbent comprises the steps of adsorption, desorption, evaporation concentration, step-by-step cooling crystallization and drying, battery-grade lithium dihydrogen phosphate with the purity larger than or equal to 99.5% is finally obtained, and the lithium comprehensive yield reaches 90% or above. The process provided by the invention does not need to remove impurities in advance, has high selectivity, can recycle the adsorbent, has the characteristics of simple flow, low energy consumption, environmental friendliness and suitability for large-scale production, and has remarkable environmental protection and economic benefits.

The application discloses a preparation method of a porous polymer adsorbent for nitric oxide purification, which comprises the following steps: mixing a template monomer and a first initiator to obtain a first solution, dropping the first solution into deionized water containing an emulsifier to obtain a first emulsion, and heating the first emulsion in a water bath to perform emulsion polymerization reaction and obtain a template emulsion; mixing wall material monomers and the template emulsion to obtain a second solution, adding a second initiator, heating the emulsion in a water bath to perform emulsion polymerization reaction, and obtaining a microsphere emulsion; adjusting the pH of the microsphere emulsion to be between 8 and 12, heating the emulsion in a water bath to perform hydrolysis reaction, and obtaining a second emulsion; mixing a third solution obtained by mixing a crosslinking monomer and a third initiator into the second emulsion, and heating the emulsion in a water bath to perform monomer polymerization reaction and obtain a third emulsion; and performing suction filtration on the third emulsion, and performing vacuum drying to obtain a granular porous polymer adsorbent. The preparation method has low cost and simple process, and the prepared adsorbent has high adsorption rate.

The application belongs to the technical field of molecular recognition adsorption separation functional material preparation, and discloses a method for preparing a bowl-shaped imprint polymer adsorbent by asymmetric action induced silicon-based imprint droplets and application thereof. The application uses 9-vinyladenine 9-VA as a functional monomer, beta-thymidine as a functional monomer, and forms silicon-based imprint droplets after pre-assembly and hydrolysis of 3-(trimethoxysilyl) methyl propyl methacrylate. Subsequently, ellipsoidal iron oxide particles are synthesized, and the surface of the ellipsoidal iron oxide particles is modified by using PVP as a seed, and the silicon-based imprint droplets are polymerized under the condition of magnetic stirring. Due to the centrifugal force, the mass of the iron oxide particles is much larger than that of the polymer droplets, and the iron oxide particles will drag the polymer droplets to deform and form a larger depression under the action of the asymmetric force. AIBN is added to initiate polymerization and solidification, and the composite bowl-shaped imprint polymer particles containing the iron oxide particles are prepared, which are used for realizing high-selectivity adsorption and separation of dT.

The present invention belongs to the technical field of polymer adsorption materials, and specifically relates to a polymer adsorbent, its preparation method, and application. The method for preparing the polymer adsorbent provided by the present invention comprises the following steps: mixing a stabilizer and a stabilizing aid with water to obtain an aqueous phase; mixing an alkenyl aromatic monomer, a polyalkenyl ester monomer, a halogenated olefin monomer, a porogen, and an initiator to obtain an oil phase; adding the oil phase to the aqueous phase to obtain a polymer intermediate through a suspension polymerization reaction; extracting the porogen from the polymer intermediate, drying, swelling, and adding a catalyst to carry out a cross-linking reaction to obtain the polymer adsorbent.

The application discloses a kind of circulating water aquaculture organic matter and antibiotic targeted adsorption degradation method, belong to aquaculture pond water treatment technical field, steps are as follows: the water outlet of mandarin fish culture pond is introduced into microfilter and retained solid phase pollutants;Water outlet enters raw water pool after buffer tank;Raw water pool water outlet enters biological filter and degrades organic matter;Water outlet flows into molecular imprinting targeted adsorption unit, and antibiotic, hormone are captured by double-targeted molecular imprinting polymer adsorbent;Water outlet enters heterogeneous electrofenton catalytic oxidation unit, and electrolysis is synergized with composite catalyst to catalyze and mineralize pollutant;After water outlet is neutralized pool, into air-lift culture tower reoxygenation and culture beneficial bacteria;After sensor monitoring, water quality reaches standard and then backflow aquaculture pond, otherwise backflow to targeted adsorption unit secondary treatment.The application effectively solves the problems that existing mandarin fish culture circulating water treatment process is difficult to target removal terramycin and other pollutants, which causes accumulation, low adsorption and oxidation efficiency, material easy to inactivate, lack of intelligent control, poor water quality adaptability of effluent.

The invention introduces a resin adsorption recovery system and method for an organic phase in alkali extraction strip liquor, and relates to the technical field of hydrometallurgy organic phase recovery, the resin adsorption recovery system comprises a strip liquor front storage tank, a heating stirrer, a resin adsorption unit, a pure water storage tank, an alcohol storage tank, an organic phase buffer tank, a strip liquor rear storage tank and a detection control unit; the method comprises the following specific steps: S1, pretreatment; s2, removing an organic phase; s3, resin desorption and regeneration; s4, recovering an organic phase; and S5, recycling the resin. The oil removal efficiency is remarkable; high-efficiency organic phase recovery; the resin circularity is high; the process controllability is high; the environment-friendly economy is good.

The present invention discloses an application of a siderophore derived from Lysobacterium. High-purity siderophore was obtained from the fermentation broth of Lysobacter OH11 through fermentation culture, XAD16 resin adsorption and desorption, and HPLC preparation. Mass spectrometry and nuclear magnetic resonance confirmed that the siderophore was a catechol type, composed of two catechol groups and one spermidine, with a molecular formula of C 21 O6N3H 27 The molecular weight is 417Da and it is named Sperbactin. The plate antagonism test showed that Sperbactin has strong antagonistic activity against rice bacterial leaf blight and rice bacterial leaf streak pathogen. 50 The concentrations of these substances are 15.44 mg / L and 16.76 mg / L respectively, which can be developed into highly effective bactericides.

The present invention provides a method for adsorptive separation of siloxanes. The method of the present invention comprises the steps of adsorbing and optionally desorbing a gas containing siloxanes using a resin adsorbent; wherein the resin adsorbent comprises a modified styrene-divinylbenzene resin having a first nitrogen-containing group free of hydroxyl groups and a second nitrogen-containing group containing hydroxyl groups, wherein the first nitrogen-containing group is selected from one or more of a secondary amine group free of hydroxyl groups, a tertiary amine group free of hydroxyl groups, a quaternary ammonium group free of hydroxyl groups, a nitrogen heterocycle group free of hydroxyl groups, and the second nitrogen-containing group is selected from one or more of a secondary amine group containing hydroxyl groups, a tertiary amine group containing hydroxyl groups, a quaternary ammonium group containing hydroxyl groups. The method of the present invention has a high removal rate for both high and low concentrations of siloxanes.

The application relates to a preparation method of a proton buffer polymer adsorbent for removing hexavalent chromium, and relates to a preparation method of a hexavalent chromium adsorbent. The application aims to solve the technical problem that the existing nitrogen-containing polymer adsorbent has poor adsorption effect on hexavalent chromium anions under alkaline conditions. In the process of synthesizing the polyamine adsorbent, acrylic small-molecule compounds are introduced, the double bonds in the molecules of the acrylic small-molecule compounds can be opened under the action of active free radicals and form carbon positive free radicals, the carbon positive free radicals can collide with amine monomer free radicals with opened double bonds, and the acrylic-amine polymer is successfully crosslinked and polymerized under the action of a crosslinking agent. Experimental results prove that the proton buffer adsorbent provided by the application can efficiently remove Cr(VI) under wide pH conditions (pH=1-10), and the removal rate under alkaline conditions is kept above 79.5%.

The invention relates to the technical field of separation and purification of natural functional components, in particular to a resin cross-linking agent, acylthiourea-containing rosin-based adsorption resin and a preparation method and application of the acylthiourea-containing rosin-based adsorption resin. The preparation method of the cross-linking agent comprises the following steps: reacting maleated rosin with SOCl2 to obtain an intermediate product A, reacting the intermediate product A with potassium thiocyanate, reacting the intermediate product B with aniline-o-methylaniline to obtain an intermediate product C, and reacting the intermediate product C with ethyl acetate and hydroxyethyl acrylate to obtain the cross-linking agent NMDMR. The adsorption resin is synthesized by taking NMDMR as a cross-linking agent and diethylbenzene (DVB) and methacrylic acid (MAA) as monomers through a suspension polymerization method. The PNS adsorption capacity of the obtained rosin-based resin is 221.11 mg / g, and the rosin-based resin has good adsorption separation and purification capacity on PNS, and is a renewable and efficient rosin-based resin adsorbent.