58 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 the field of industrial production waste liquid treatment, and particularly provides a low-energy-consumption waste acid recycling method. The main process comprises the steps of pretreatment, ultrafiltration, resin adsorption and membrane distillation. Impurities such as oil in the waste acid raw material are removed in the pretreatment link; sS, foam and the like in the waste acid are removed in the ultrafiltration link; impurities such as heavy metals in the waste acid are removed in the resin adsorption link; in the membrane distillation link, a hydrophobic membrane is used as a filtering medium, the steam pressure difference on the two sides of the membrane is used as mass transfer driving force, under the heating condition, water molecules in the raw material liquid are evaporated into water vapor penetrating through the membrane, the solution cannot penetrate through the membrane, the raw material is concentrated along with continuous evaporation of the water molecules, the purpose of concentrating the material liquid is achieved, and waste acid recovery is achieved. According to the method, waste acid is recycled, waste heat of the system is recycled, and the whole technological process is simple, low in operation cost, stable in operation and high in automation degree.

The invention relates to the technical field of adsorbent preparation, in particular to an imidazolium salt polymer adsorbent as well as a preparation method and application thereof. The preparation method of the imidazolium salt polymer adsorbent comprises the following steps: mixing a polybromophenyl organic compound, imidazole, alkali and a catalyst, and carrying out nucleophilic substitution reaction under the action of the catalyst and the alkali to obtain a triimidazolyl organic monomer; the preparation method comprises the following steps: dissolving a triimidazolyl organic monomer and 1, 4-di (bromomethyl) benzene in an organic solvent, and carrying out quaternization reaction to obtain the imidazolium salt polymer adsorbent. The imidazolium salt polymer adsorbent prepared by the method disclosed by the invention not only can accurately identify and adsorb Cr2O7 < 2-> and remarkably improve the removal efficiency of Cr2O7 < 2->, but also can keep an efficient working state in a wide pH value range. Meanwhile, the material can be easily separated from wastewater and can be repeatedly used after being subjected to simple regeneration treatment, so that cyclic utilization of resources is realized.

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 belongs to the technical field of preparation of molecular identification, adsorption and separation functional materials, and discloses a method for preparing a bowl-shaped imprinted polymer adsorbent by inducing silicon-based imprinted liquid drops through an asymmetric effect and application of the bowl-shaped imprinted polymer adsorbent. The preparation method comprises the following steps: by taking 9-vinyl adenine 9-VA as a functional monomer and beta-thymidine as a functional monomer, pre-assembling, and then forming silicon-based imprinting liquid drops with hydrolyzed 3-(trimethoxysilyl) propyl methacrylate; then synthesizing ellipsoidal iron oxide particles, modifying the surfaces of the ellipsoidal iron oxide particles by using PVP (Polyvinyl Pyrrolidone), taking the modified ellipsoidal iron oxide particles as seeds, and polymerizing the seeds with the hydrolyzed silicon-based imprinting liquid drops under the condition of magnetic stirring; under the action of centrifugal force, the mass of the iron oxide particles is far greater than that of the polymer liquid drops, under the action of asymmetric force, the iron oxide particles drag the polymer liquid drops to deform to form large recesses, AIBN is added to initiate polymerization and curing, and the composite bowl-shaped imprinted polymer particles containing the iron oxide particles are prepared; the method is used for realizing high-selectivity adsorption separation of dT.

The present invention discloses a kit for rapid determination of brucine and strychnine by mass spectrometry, which relates to the technical field of biological detection. The kit for rapid determination of mass spectrometry includes an MCX mixed cationic adsorbent and a pyrrolidone-styrene polymer adsorbent. The kit for rapid determination of mass spectrometry effectively improves the accuracy and sensitivity of detection. Through the method of extraction by multi-well plate - liquid chromatography - tandem mass spectrometry, on a silica-based C18 reversed-phase chromatography column, under specific mobile phase composition and flow rate conditions, the separation of brucine and strychnine from interfering impurities in blood on the silica-based C18 reversed-phase chromatography column and the multi-reaction monitoring (MRM) mass spectrometry detection in the positive ion mode of the electrospray ionization source are realized, and finally the rapid, accurate and highly sensitive detection of brucine and strychnine in blood is achieved.

The invention relates to the technical field of plant chemistry, and in particular to an efficient extraction and conversion method for oligomeric proanthocyanidins and an application thereof. The method comprises mixing a proanthocyanidin polymer and a low eutectic solvent, eluting the mixed solution through resin adsorption, and drying the eluate to obtain the oligomeric proanthocyanidins. Compared with the prior art, the conversion method of the invention is novel, simple and fast, and realizes one-pot conversion. The obtained proanthocyanidin extraction rate is higher than that of most traditional ethanol and methanol proanthocyanidins. The obtained proanthocyanidins have an average polymerization degree of 3.19, which is oligomeric proanthocyanidins and is lower than the polymerization degree of most traditional ethanol and methanol proanthocyanidins. The obtained oligomeric proanthocyanidins have important significance for product development in other fields such as the medical field, the cosmetic field, and the food industry field.

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 present application relates to a pickling wastewater treatment process, including neutralization treatment, precipitation treatment, oxidation treatment, biological treatment and fine treatment. The present application uses calcium ions in lime and fluoride ions to form calcium fluoride precipitation to remove fluoride ions. The hydroxide of sodium hydroxide helps the precipitation of magnesium and aluminum ions, and can also neutralize with acids to generate salt and water to reduce the hardness of water. Sodium polystyrene sulfonate is a commonly used polymer adsorbent, which is widely used in wastewater treatment. Methacryloyloxyethyl trimethylammonium chloride is used as a cationic sewage flocculant to improve the flocculation effect. The modified chitosan has a high molecular weight, and can obtain a suitable charge density through the functional groups it has. Many parts extend into the liquid phase to improve the electrical neutralization efficiency. The extended part can also adsorb more colloidal particles to promote flocculation precipitation.

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 field of catalyst preparation, and particularly designs a polymer adsorbent-derived Fenton-like catalyst and a preparation method thereof, the Fenton-like catalyst is a Cu-coated C carbon-based Fenton-like catalyst; the preparation method comprises the following steps: S1, weighing N-methyl diallyl ammonium chloride, chloropropene and acetone, and stirring to prepare a cross-linking agent TAMAC; s2, weighing acrylic acid, a cross-linking agent TAMAC, ammonium persulfate and deionized water, heating, stirring and reacting to prepare an intermediate agent PAGH; s3, washing the intermediate agent PAGH by using a sodium hydroxide solution to prepare an adsorbent PAG; s4, adding an adsorbent PAG into the copper sulfate solution, and stirring for adsorption equilibrium; the adsorbent is filtered and dried, and PGA-Cu is prepared; and step S5, placing the PAG-Cu in a tubular furnace, and carrying out high-temperature calcination in a nitrogen atmosphere, so as to obtain the Cu-coated C carbon-based Fenton-like catalyst. The Cu-coated C carbon-based Fenton-like catalyst designed in the invention can effectively degrade a plurality of pollutants in industrial wastewater in a short time.

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 invention relates to the technical field of preparation of waste gas adsorption materials, in particular to a preparation method for improving the adsorption performance of waste gas adsorption resin, which comprises the following steps: taking a monomer, adding a deblocking agent to remove a polymerization inhibitor therein, and mixing with a pore-foaming agent and an initiator to serve as an oil phase; taking pure water, adding a dispersing agent, dissolving, and adding an anti-emulsifying agent to prepare a water phase; adding the oil phase into the water phase, stirring until the oil phase is dispersed into oil droplets with a preset size, heating and polymerizing, and adjusting the heat preservation time of the polymerization reaction process according to the pore formation condition; filtering after the reaction, washing with deionized water until effluent is transparent, screening to obtain an initial polymer, removing the pore-foaming agent, fully swelling the dried initial polymer through an organic solvent, adding Lewis acid, fully dissolving, heating, preserving heat, filtering and washing to obtain the adsorption resin. The polymerization temperature and the heat preservation time can be adjusted according to the pore channel characteristics of the adsorption resin, and the preparation quality of the adsorption resin is improved.

The present invention provides a hypercrosslinked polymer adsorbent for separating olefins and alkanes, and a preparation method and application thereof, belonging to the technical field of separating olefins and alkanes. The method comprises the following steps: mixing a monomer, an acidic catalyst and a solvent to carry out a Friedel-Crafts alkylation reaction to obtain a hypercrosslinked polymer; sulfonating the hypercrosslinked polymer to obtain a sulfonation product; carrying out a hydrolysis reaction on the sulfonation product under an alkaline condition to obtain a hydrolysis product; and carrying out ion exchange on the hydrolysis product to obtain the hypercrosslinked polymer adsorbent for separating olefins and alkanes. The adsorbent prepared by the present invention can be applied to the separation of liquid-phase olefins and alkanes (C6, C7 and C8), and the preparation process and the post-treatment method are simple. The monomer, the acidic catalyst and the solvent used are all cheap and easily available, and the preparation process is easy to realize industrial scale-up.

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.

The present invention proposes a saliva collection device with a virus enrichment and adsorption structure, comprising a sampler and a sample storage bottle; the sampler comprises a hollow package, a resin adsorption module and a negative pressure control device; the package is provided with a collection port and a negative pressure port; the resin adsorption module is placed in the package and is arranged at one end of the package close to the collection port; the negative pressure control device is detachably connected to the negative pressure port of the package; the sample storage bottle is preset with a sample preservative solution; after the sampler takes a sample, it is inserted into the sample storage bottle, so as to propose a saliva collection device that can achieve effective adsorption and enrichment for viruses and short-term storage of viruses.

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 discloses a reticular high-molecular polymer adsorbent based on a triazine structure and a preparation method and application of the reticular high-molecular polymer adsorbent, and belongs to the technical field of adsorbents. The triazine structure serves as a basic framework, N + is introduced to modify the basic framework, and the triazine structure has rich electron clouds and nitrogen atoms; compared with the prior art, the composite material has the advantages that the composite material can form a stable complex with specific ions or molecules, so that the composite material has higher selectivity and efficiency in the aspects of adsorbing specific metal ions, organic pollutants and the like, has higher thermal stability and oxidation resistance, is suitable for being used under severe environmental conditions, and particularly has excellent performance in high-temperature and acid-base environments.

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 waste gas adsorption material preparation, and specifically to a preparation method for improving the adsorption performance of waste gas adsorption resin, comprising: taking monomers, adding deblocking agents, removing polymerization inhibitors therein, and mixing with porogens and initiators as an oil phase; taking pure water, adding dispersants, dissolving, and adding anti-emulsifiers to prepare an aqueous phase; taking the oil phase and adding it to the aqueous phase, stirring until the oil phase is dispersed into oil droplets of a preset size, then heating and polymerizing, and adjusting the insulation time of the polymerization reaction process according to the pore formation situation; filtering after the reaction, washing with deionized water until the effluent is transparent, sieving to obtain the initial polymer, and removing the porogen, and fully swelling the dried initial polymer with an organic solvent, adding Lewis acid to fully dissolve and heat and keep warm, and filtering and washing to obtain the adsorption resin. The present application can adjust the polymerization temperature and insulation time according to the pore characteristics of the adsorption resin to improve the preparation quality of the adsorption resin.

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.