1229 results about "Selective adsorption" patented technology

The invention relates to the technical field of preparation of lithium adsorbents, in particular to a fluorine-containing polymer microsphere adsorbent for selectively adsorbing lithium as well as a structure regulation and control method and an application method thereof, and solves the technical problems of poor selectivity, low adsorption capacity, high preparation cost and complex preparation process of an existing lithium adsorbent. The fluorine-containing polymer microsphere adsorbent material based on the emulsion polymerization method is synthesized, operation is easy, cost is low, synthesis efficiency is high, large-scale preparation can be achieved, and high selectivity and adsorption capacity are achieved. The adsorbent material can efficiently and selectively adsorb lithium ions in lithium-containing wastewater containing a large number of coexisting monovalent and high-valent competitive ions, the adsorbability of the adsorbent material to the lithium ions is far better than that of the adsorbent material to ions such as sodium, potassium, cobalt, manganese and the like, and the adsorption capacity of the adsorbent material to the lithium ions can reach 38.5 mg / g at most.

The invention discloses a method for selectively extracting rubidium from lithium ore tailings in a short process, and relates to the field of comprehensive utilization of mineral waste. The method comprises the following steps: grinding the lithium ore tailings into powder; adding an additive into the lithium ore tailing powder, and fully stirring and mixing; roasting the mixture to obtain a calcined clinker; directly carrying out water leaching on the calcined clinker; rubidium enrichment liquid and leaching residues are obtained from the leaching liquid through solid-liquid separation; the rubidium extraction composite material is mixed with rubidium enrichment liquid, and selective adsorption of rubidium is achieved; and recycling the composite material, and the like. According to the method, efficient selective recovery of rubidium in the lithium ore tailings is achieved, the water leaching time is shortened, the water leaching temperature and the rubidium extraction roasting reaction temperature are reduced, the separation efficiency of impurities in the lithium ore tailings and the selective recovery efficiency of the rubidium element are remarkably improved, and efficient selective recovery of rubidium in the lithium ore tailings is achieved.

The invention discloses an efficient combined regulator for easily-argillized copper oxide cobalt ore and a beneficiation method. The efficient combined regulator comprises the following components in parts by weight: 250-350 parts of sodium citrate and 1100-1200 parts of sodium hydrosulfide. Sodium citrate has high dispersing capacity, and the efficiency of selective adsorption between the argillization copper-cobalt ore and the medicament can be improved; meanwhile, the complexing ability of sodium citrate on ions, such as Fe, Ca and Mg, influencing agent adsorption on the surface of the ore is high, in addition, products obtained after complexing of the Fe, Ca and Mg ions can be dissolved in water, and action sites are provided for selective adsorption of a vulcanizing agent (NaHS) and a collecting agent amyl xanthate (PAX). According to the combined regulator and the beneficiation method provided by the invention, the problem of poor reagent selectivity in the flotation process of the argillization copper-cobalt ore can be obviously improved, the vulcanization effect of a vulcanizing agent is enhanced, and selective adsorption of a collecting agent is promoted, so that the recovery rate of copper and cobalt metals in the copper-cobalt oxide ore under the condition of serious ore argillization is improved.

The invention discloses a preparation method of a high-activity hierarchical pore boric acid imprinted hydrogel microsphere adsorbent and application of the adsorbent to selective adsorption of a flavonoid compound naringin NRG. According to the invention, dopamine is used for modifying COFs so as to enhance surface functionalization of COFs; preparing a sulfydryl functionalized covalent organic framework microsphere; synthesizing sulfydryl microspheres by utilizing an emulsion interfacial polymerization method; preparing a COFs boron affinity imprinting microsphere adsorbent based on boron affinity interaction; the adsorbent is applied to selective adsorption of NRG in agricultural wastewater. The prepared adsorbent has a remarkable multilayer adsorption effect, and the adsorption capacity is remarkably improved through the boron affinity effect. The multi-stage pore structure of the COFs microspheres provides abundant sites for adsorption, and the mass transfer rate is remarkably improved. In addition, the prepared adsorbent shows remarkable specificity in the aspects of adsorption and separation of NRG, and a promising adsorption material is provided for industrial separation of NRG.

The invention discloses a recovery treatment process of heavy metal production wastewater, and relates to the technical field of wastewater treatment. Adjusting the pH value of the wastewater through pretreatment and stirring; 5%-10% of nanometer seed crystals are added in the seed crystal reinforced vulcanization process, a vulcanizing agent is controllably added, and large-particle-size precipitates are generated through pulse stirring; magnetic field separation is performed after magnetic microsphere adsorption; carrying out selective adsorption and acid regeneration on the chitosan-based magnetic resin; micro pollutants are removed through cooperation of the three-dimensional electrode and photocatalysis; concentrating 10-20 times by membrane distillation to enrich heavy metals; metal simple substances with the purity larger than or equal to 99.5% are recycled through pulse electrodeposition; and after deep treatment, the wastewater reaches the standard to be discharged or recycled (the recycling rate is greater than or equal to 70%). The process innovation comprises the steps of enhancing the seed crystal to improve the vulcanization efficiency by 30%, realizing rapid separation by a magnetic material, reducing the energy consumption by 40% by a three-dimensional electrode coupling membrane method, and constructing a vulcanizing agent regeneration (the regeneration rate is greater than or equal to 85%) and heavy metal closed-loop recovery system. Compared with a traditional process, the heavy metal removal rate is larger than or equal to 99.8%, the treatment cost of each ton of water is reduced by 25%-30%, and the method has the advantages of high efficiency, low consumption, environmental protection and recycling and is suitable for multi-metal complex wastewater.

The invention discloses a UiO-66-(COOH) 2-Glu composite material for efficient recovery of lithium ions and application of the UiO-66-(COOH) 2-Glu composite material. A preparation method of the UiO-66-(COOH) 2 composite material comprises four steps of preparation of UiO-66-(COOH) 2, drying treatment, amino acid modification and separation and purification. The preparation process comprises the following steps: preparing a precursor UiO-66-(COOH) 2-Glu in an aqueous solution system under mild conditions, carrying out functional modification by introducing glutamic acid, and introducing amino groups and carboxyl groups in amino acid to enhance the selective adsorption performance of the UiO-66-(COOH) 2-Glu composite material on lithium ions, thereby obtaining the UiO-66-(COOH) 2-Glu composite material. The preparation process is green, environment-friendly and low in cost, traditional high-temperature and high-pressure conditions are avoided, the practicability of the material is remarkably improved, and the prepared material shows excellent lithium ion selective adsorption performance and shows excellent performance in the field of rapid recovery of lithium ions.

The invention provides bacillus and application thereof in separation and recovery of heavy rare earth, the strain of the bacillus is named as Bacillus sp.DW011 and preserved in Guangdong Microbial Culture Collection Center, and the preservation number is GDMCC No: 65275. The invention belongs to the technical field of biological environmental protection, provides novel bacillus, enriches the prior art, realizes application of the novel bacillus in separation and recovery of heavy rare earth, has extremely strong stress resistance and good adaptability to the external environment, and is beneficial to selective adsorption and recovery of heavy rare earth ions.

The invention belongs to the technical field of environmental protection and water treatment, and particularly relates to a fluorosilane coupled layered double hydroxide composite material, a preparation method thereof and application of the fluorosilane coupled layered double hydroxide composite material to removal of perfluorinated or polyfluoroalkyl substances in water. The fluorosilane coupled layered double-metal hydroxide composite material provided by the invention comprises layered double-metal hydroxide and a fluorosilane coupling agent which is chemically modified on the surface of the layered double-metal hydroxide. The adsorption performance of the composite material on PFASs can be effectively improved, and the selective adsorption capacity of LDHs on PFASs is remarkably enhanced. In addition, the fluorosilane coupled layered double-metal hydroxide composite material provided by the invention shows excellent stability and adsorption performance under the conditions of different coexisting anions, pH values and ionic strengths. Regeneration cycle experiment results show that the material provided by the invention can still maintain relatively high adsorption performance after being used for multiple times.

The invention provides a synthesis method of a bromide ion adsorbent for salt lake bromine extraction, and belongs to the technical field of adsorbent preparation, a mixed solution of strontium chloride and manganese chloride and a mixed solution of sodium phosphate and sodium hydroxide are subjected to precipitation reaction to obtain A-Sr4Mn6 (PO4) 6 (OH) 2; the preparation method comprises the following steps: reacting A-Sr4Mn6 (PO4) 6 (OH) 2 with a sodium bromide solution to obtain B-Sr4Mn6 (PO4) 6Br2; and reacting the B-Sr4Mn6 (PO4) 6Br2 with a sodium hydroxide solution to obtain Sr4Mn6 (PO4) 6 (OH) 2, namely the bromide ion adsorbent. The prepared adsorbent can selectively adsorb bromide ions from high-salt brine, and has the advantages of high adsorption capacity, high selectivity, high recyclability and the like; in brine with extremely high chloride ion concentration, low-concentration bromide ions can be selectively adsorbed without being influenced by high-concentration chloride ions; in a high-salt water body, the adsorption capacity on bromide ions is higher; the selective adsorption separation of the chloride ions and the bromide ions is realized.

The present invention relates to a method for preparing a attapulgite / molecular sieve composite adsorbent, comprising the following steps: (1) using NaX molecular sieve powder as a raw material, adding purified attapulgite, grinding, adding an aluminum source for crystallization, filtering, washing to a pH of 7 to 8, and drying to obtain a attapulgite / molecular sieve composite adsorbent precursor; (2) exchanging the composite adsorbent precursor obtained in step (1) with metal cations, and then filtering, washing, drying, molding, and activating to obtain the composite adsorbent. The composite adsorbent has a simple preparation method, a large adsorption capacity, and good selectivity. It can effectively adsorb and separate liquid mixtures, and has broad application prospects in selectively adsorbing and separating p-xylene from C8 aromatic isomers. The present invention also relates to a attapulgite / molecular sieve composite adsorbent and its application in adsorbing and separating p-xylene in mixed xylene.

The invention discloses preparation and application of carbon nitride / titanium carbide / amidoxime-based gel, and relates to preparation and application of a carbon nitride composite titanium carbide composite amidoxime-based hydrogel material. The invention provides the preparation method of the amidoxime-based hydrogel which is simple in synthesis, high in adsorption speed and high in efficiency. The design of the hydrogel material with high-speed uranium adsorption and green uranium circulation has important significance for realizing seawater uranium circulation, wherein the adsorption and desorption functions and the design of the mechanism thereof are key. According to the preparation method, the two-dimensional PAO / TiC / CN hydrogel is prepared by compounding PAO nanoparticles with a selective adsorption function and a two-dimensional TiC-CN photocatalyst. The hydrogel has a porous structure and cannot be damaged after being soaked in water for more than six months.

The invention belongs to the technical field of activated carbon, and particularly relates to a preparation method and application of activated carbon for organic wastewater treatment. The preparation method of the activated carbon comprises the following steps: (1) mixing pulverized coal, biomass powder and a binder to obtain mixed powder; and (2) carbonizing and activating the mixed powder to obtain the activated carbon. The preparation method has the beneficial effects that biomass is adopted as a main raw material for preparation of the activated carbon, the problems of resource waste and environmental pollution caused by discarding and burning of the biomass are solved, and the obtained activated carbon is high in specific surface area, rich in pores, relatively large in average pore size, developed in mesopores, low in floating rate and high in adsorption capacity. The adsorbent is suitable for adsorbing macromolecular pollutants in organic wastewater, has relatively high selective adsorption capacity on organic macromolecules, and can meet the treatment requirements of industrial organic wastewater. The adsorbent can be used for adsorbing and purifying organic wastewater in industries such as chemical industry, food and medicine.

The present application relates to wastewater treatment technical field, specifically to a kind of ammonia nitrogen wastewater treatment method, the composite modified zeolite material in the present application has excellent physical adsorption capacity to ammonia nitrogen by virtue of its unique pore structure and surface properties, ammonia nitrogen molecules in wastewater can be quickly captured, then through the synergistic effect of composite photocatalyst under light and ultrasonic, strong oxidizing free radicals are generated, ammonia nitrogen molecules not completely adsorbed by zeolite material are deeply degraded, through the synergistic effect of adsorption and photocatalysis, the removal efficiency of ammonia nitrogen is significantly improved;After adsorption and photocatalytic treatment, the ammonia nitrogen concentration in wastewater has been greatly reduced, and resin adsorption treatment is used as a subsequent step, which can selectively adsorb residual trace amounts of ammonia nitrogen and other impurities, thereby realizing deep purification of wastewater and ensuring that the effluent quality meets or exceeds relevant discharge standards.

The invention discloses a selective desiliconization method for alkaline vanadium liquid. According to the process, magnesium-aluminum hydrotalcite prepared in advance is introduced into the alkaline vanadium liquid, the pH does not need to be regulated and controlled, silicon can be selectively adsorbed, desilicication slag is desorbed and then recycled as a desilicication agent, and a sodium silicate-containing solution can be used for preparing a water glass product. According to the method for deeply adsorbing silicon in the alkaline vanadium liquid by adopting the magnesium-aluminum hydrotalcite, various conditions of an existing process are not greatly changed, disturbance to existing industrial production is small, meanwhile, the problems that the desilicication limit of the alkaline vanadium liquid is insufficient and vanadium loss is high at present can be solved, silicon in the alkaline vanadium liquid can be reduced to 30 mg / L or below, and the requirements of vanadium products are met.

The invention discloses a modified mesoporous silica adsorbent as well as a preparation method and application thereof, and relates to the technical field of porous material preparation. The preparation method of the modified mesoporous silica adsorbent provided by the invention comprises the following steps: hydrolyzing a silicon source in a solution containing a template agent to form a preliminary framework of silica, then adding a silane coupling agent containing at least one of sulfydryl, sulfonyl and amino, carrying out a hydrothermal reaction at 60-120 DEG C, and removing the template agent to obtain the modified mesoporous silica adsorbent. The modified mesoporous silica adsorbent capable of selectively adsorbing zirconium and hafnium can be obtained. The modified mesoporous silica adsorbent prepared by the method is used for adsorbing and enriching zirconium and hafnium ions, the adsorption capacities of 6.23 mg / g and 5.95 mg / g or above can be obtained respectively, the adsorption capacity is excellent, and the adsorbent can reach adsorption equilibrium within 10 min and is excellent in adsorption rate.

The invention provides a method for preparing high-purity phosphatidylserine by a batch enzyme catalysis method based on dynamic choline removal, and belongs to the technical field of enzymatic reaction. According to the method disclosed by the invention, in a reaction system for preparing phosphatidylserine, a byproduct choline is selectively adsorbed by adopting resin. Choline in a reaction system is removed in real time through the integrated adsorption separation module, the enzyme inhibition problem is solved, and meanwhile, the PC conversion rate is larger than or equal to 98% and the PS purity is larger than or equal to 96% in combination with the immobilized enzyme circulation technology; the enzyme can be reused for more than or equal to 20 times (activity retention is more than or equal to 90%); and the choline residual concentration is less than or equal to 0.5 mM (an inhibition threshold value or less).

The invention relates to the technical field of sewage treatment, and provides a magnetic multi-effect multi-element composite amphiphilic particle as well as a preparation method and application thereof. The particle comprises a core-shell separated magnetic Fe3O4 particle core and a shell layer, wherein the shell layer is a silicon dioxide / titanium dioxide hybrid shell layer with a fine hole structure; the outer surface of the shell layer comprises a hydrophilic part and a hydrophobic part, the hydrophilic part has an amino group, the amino group is grafted with polydopamine, and gallic acid and catechinic acid are compounded on the polydopamine; poly (diethylaminoethyl methacrylate) is grafted on the inner surface of the shell layer and the surface of the magnetic Fe3O4 particle core. The magnetic multi-effect multi-component composite amphiphilic particle provided by the invention has excellent emulsifying performance and can realize oil-water separation; meanwhile, partial hydrolyzed polyacrylamide can be selectively adsorbed, and oily sewage containing partial hydrolyzed polyacrylamide can be efficiently treated in one step.

The invention relates to a high-selectivity flotation method for minerals, belongs to a flotation technology, and aims to solve at least one of the problems of poor mineral collecting effect, poor selectivity, high collecting agent consumption and the like in the conventional flotation method. According to the method, firstly, impurities on the surface of ilmenite raw ore are stripped through first-time microwave pretreatment, meanwhile, part of Fe < 2 + > on the surface of the ilmenite is converted into Fe < 3 + >, and selective adsorption of a flotation reagent on the surface of the ore is better facilitated. The fucoidin is added into the ore pulp for secondary microwave pretreatment, so that the fucoidin in the ore pulp is broken to form an inhibitor with small molecular weight, and meanwhile, the reaction activity of the fucoidin is enhanced by microwave catalysis, so that the process of selectively adsorbing the fucoidin on the surface of gangue is more stable; the effect of improving the inhibition effect can be achieved, and the using amount of the collecting agent can be effectively reduced.

The invention discloses a protein-based adsorbent capable of efficiently adsorbing perfluorinated compounds and application of the protein-based adsorbent. The adsorbent is obtained by coating polyethyleneimine in a phase transition aggregate formed by unfolding protein through a disulfide bond reducing agent. The use method of the adsorbent comprises the step of feeding the adsorbent into a solution containing the perfluorinated compound to realize efficient adsorption of the perfluorinated compound. The adsorbent has the advantages of being low in cost, efficient, easy to operate, environmentally friendly, free of secondary pollution, good in biocompatibility and the like, efficient selective adsorption of perfluorinated compounds can be achieved through the adsorbent, the adsorbent can be repeatedly used, and industrial application and popularization are easy.

The invention relates to the technical field of wastewater treatment, in particular to an ammonia-nitrogen wastewater treatment method.A composite modified zeolite material has excellent physical adsorption capacity on ammonia nitrogen by means of the unique pore structure and surface property of the composite modified zeolite material, ammonia nitrogen molecules in wastewater can be rapidly captured, and the ammonia nitrogen wastewater treatment effect is improved. Then, under the synergistic effect of illumination and ultrasonic waves, free radicals with strong oxidizing property are generated through the composite photocatalyst, ammonia nitrogen molecules which are not completely adsorbed by the zeolite material are deeply degraded, and the removal efficiency of ammonia nitrogen is remarkably improved through the synergistic effect of adsorption and photocatalysis; after adsorption and photocatalysis treatment, the concentration of ammonia nitrogen in the wastewater is greatly reduced, then resin adsorption treatment is adopted as a subsequent step, and residual trace ammonia nitrogen and other impurities can be selectively adsorbed, so that deep purification of the wastewater is realized, and the effluent quality is ensured to reach or be superior to related emission standards.

The invention belongs to the technical field of power equipment state monitoring, and discloses a transformer oil dissolved gas surface enhanced Raman spectrum in-situ monitoring method and a transformer oil dissolved gas surface enhanced Raman spectrum in-situ monitoring system. The system comprises a membrane degassing unit, a Raman sensing unit, a light path unit, a data processing unit and a calibration early warning unit, the method comprises the following steps: firstly preparing a gold nanostar array sensing substrate with bifunctional groups to realize selective adsorption and signal enhancement of characteristic gas, then completing in-situ oil-gas separation through the membrane degassing unit, collecting a Raman spectrum through the light path unit, and calculating the Raman spectrum of the gold nanostar array sensing substrate according to the Raman spectrum. Spectral analysis and quantification are completed based on multiple algorithms, and fault early warning is achieved in combination with temperature and pressure compensation and an industrial standard threshold value. According to the scheme, the problems of lagging, weak interference resistance and the like of traditional monitoring are solved, high sensitivity and high specificity are achieved, full-process automatic closed-loop monitoring can be achieved, and accurate data support is provided for operation and maintenance of the transformer.

The invention relates to the technical field of purification, and discloses a hydrogen purification method based on a magnesium-based solid hydrogen storage material, which comprises the following steps: S11, packaging the magnesium-based solid hydrogen storage material into a plurality of purification units, connecting the two purification units in parallel, and arranging a thermal interaction unit between the two parallel purification units to form a primary purification module; and S2, purification: introducing the low-purity hydrogen into the purification module, so that the low-purity hydrogen is respectively subjected to a hydrogen absorption reaction and a hydrogen desorption reaction for multiple times in the purification units connected in parallel, the low-purity hydrogen is purified, heat is supplied to the purification units which are subjected to the hydrogen desorption reaction through the heat interaction unit, and heat energy released by the hydrogen absorption reaction is stored. Based on the selective adsorption capacity of the solid hydrogen storage material to hydrogen, the solid hydrogen storage material is used for adsorbing hydrogen and discharging impurity gas, so that the purity of hydrogen is improved, and the heat interaction unit is used for storing heat energy released by a hydrogen absorption reaction and applying the heat energy to a hydrogen desorption reaction, so that the energy consumption in the purification process is reduced.

Disclosed herein is a composite material, comprising a hydrogel polymeric matrix, a plurality of MXenes, where each MXene has a first and second surface and a plurality of copper atoms are dispersed on the first and second surface of each MXene, and cellulose nanocrystals, wherein the plurality of MXenes and cellulose nanocrystals are dispersed throughout the hydrogel polymer matrix Also disclosed herein are a sorbent cartridge for use in kidney dialysis, wherein the sorbent cartridge comprises a composite material as aforementioned, use of a composite material as aforementioned in the selective adsorption of urea, use of a composite material as aforementioned in a wearable artificial kidney device, and a method of dialysis comprising the steps of (i) obtaining a dialysate from a subject, and (ii) passing the dialysate through a sorbent material that comprises the composite material as aforementioned.

The invention provides a high-quality potassium hydroxide refining and impurity removal process, belongs to the field of potassium hydroxide impurity removal, and aims to overcome the defect that the purity of a potassium hydroxide product is reduced due to defects in removal precision and process stability during potassium hydroxide impurity removal in the prior art. The method comprises the following steps: carrying out oxidation decomposition on organic matters and precipitating calcium and magnesium ions, carrying out coarse filtration to remove large-particle impurities, carrying out graded filtration by adopting a three-stage series inorganic membrane module, carrying out efficient interception on impurities with different particle sizes by accurately controlling the pressure, temperature and flow rate of each membrane layer, and carrying out hydrochloric acid neutralization and potassium sulfite dechlorination to optimize the indexes of the brine. And finally, trace calcium and magnesium ions are deeply removed by utilizing the selective adsorption characteristics of the chelate resin and the strong acid cation resin, and after the resin is saturated, the resin is eluted, regenerated and recycled through acid and alkali with specific concentration, so that the impurity removal effect of potassium hydroxide is improved.

The invention provides a method for accurately regulating and controlling pores of an MXene material by utilizing a phosphonic acid ligand, which mainly comprises the following key steps of: directionally removing a main group element (A) layer of an MAX precursor by wet etching to obtain lamellar MXene, and then introducing a protonated quaternary amine compound intercalator to strip the MXene. And finally, carrying out functional modification and conversion by adopting a phosphonic acid ligand, and stably introducing phosphonic acid groups between layers and on the surface of MXene through solvothermal reaction to realize accurate regulation and control of interlayer spacing. The prepared material can realize efficient adsorption of uranyl in an acidic environment, shows high selectivity, high adsorption capacity and good acid stability and regeneration capacity to uranyl, provides a stable and efficient selective adsorption solution for treating high-acidity uranium-containing nuclear wastewater, and has a remarkable industrial application prospect.

The invention discloses an intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response as well as a preparation method and application of the intelligent modified atmosphere packaging film. The preparation method comprises the following steps: mixing thymol emulsion and graphene oxide dispersion liquid, and stirring and reacting at room temperature in a dark place to prepare graphene oxide-thymol; the preparation method comprises the following steps: dissolving chitosan in an acetic acid aqueous solution, then adding graphene oxide-thymol and a plasticizer, and carrying out ultrasonic dispersion treatment to form a film-forming solution; and carrying out film forming treatment on the film forming solution by adopting a casting method to prepare the intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response. The prepared intelligent modified atmosphere packaging film can be modified automatically, is uniform and stable in structure, high in encapsulation efficiency, close in coordination, good in antibacterial and antioxidant activity and excellent in mechanical property and gas barrier property, can realize selective adsorption of gas, controls release of thymol by responding to changes of the pH value and humidity in the environment, and has a good application prospect. The method has a good application prospect in the field of fruit and vegetable preservation.

The invention discloses a deep fluorine removal agent and application thereof in wastewater in the photovoltaic industry, and belongs to the technical field of fluorine-containing wastewater treatment.The deep fluorine removal agent is obtained by conducting coordination on cross-linked hybrid chitosan microspheres and lanthanum ions to obtain composite microspheres and then synthesizing zirconium-based MOF on the composite microspheres through a hydrothermal synthesis method. The pore channels of the MOF facilitate the passing of fluorine ions but not the passing of sulfate ions, play a certain barrier role, facilitate the enrichment of the fluorine ions on the surfaces of the composite microspheres and the selective adsorption of the lanthanum ions on the fluorine ions, so that the fluorine ions are fixed, and the combination stability of the fluorine ions and the lanthanum ions is greater than that of the sulfate ions. The sulfate ions are in disadvantage when competitive adsorption with the fluorine ions, the selectivity of the deep fluorine removal agent to the fluorine ions is improved, the magnesium ions can be combined with the fluorine ions to generate complexes and can be combined with the sulfate ions to generate soluble magnesium sulfate, and interference of the sulfate ions is reduced through cooperation of the magnesium ions and the sulfate ions.

The invention belongs to the technical field of organic matter extraction, and particularly relates to a green directional extraction and purification method for haematococcus astaxanthin, which comprises the following steps: (1) mixing dried haematococcus powder and a composite pretreatment agent according to a mass ratio of 1: (8-15), and stirring to obtain a pretreated algae solution; (2) treating the pretreated algae liquid through ultrahigh-pressure microjet equipment to obtain wall-broken slurry; (3) mixing the wall-broken slurry and a composite extraction agent according to a volume ratio of 1: 3-1: 5, and performing extraction separation to obtain an astaxanthin extraction phase; (4) carrying out selective adsorption on the astaxanthin extraction phase through an adsorption column filled with a molecular imprinting adsorbent; (5) collecting eluent by adopting a gradient elution method; and (6) performing vacuum concentration on the eluent, and performing spray drying to obtain an astaxanthin product. According to the method, the astaxanthin extraction efficiency and the product purity are remarkably improved, meanwhile, the energy consumption is reduced to the maximum extent, toxic solvent residues are avoided, and the stability of the astaxanthin is effectively protected.

The invention discloses a method for treating heavy metal wastewater by using a bimetal MOFs (Metal-Organic Frameworks) derived carbon-porous carbon composite electrode material. The method comprises the following steps: preparing the bimetal MOFs derived carbon-porous carbon into a composite electrode material, and assembling the composite electrode material as a working electrode into a capacitive deionization device; and carrying out electro-adsorption treatment on the heavy metal wastewater by utilizing the capacitive deionization device to finish treatment on the heavy metal wastewater. According to the present invention, the bimetallic MOFs derived carbon-porous carbon assembled capacitive deionization device is utilized to treat the heavy metal wastewater, such that the characteristics of high adsorption capacity and selective adsorption are provided while the heavy metal ions are efficiently and rapidly removed so as to achieve the efficient removal of the heavy metals in the wastewater, and the selective recovery of the toxic and harmful metals can be performed; the method has the advantages of being low in cost, simple in process, convenient to operate, high in treatment efficiency, good in removal effect, environmentally friendly and the like, and has high application value and wide application prospects in the aspect of heavy metal polluted water treatment.

The invention discloses a preparation method of a chemically modified titanium-based sensor, which comprises the following steps: pretreatment of a titanium electrode: polishing the surface of the titanium electrode to be smooth and flat, and carrying out ultrasonic cleaning and drying; and chemical modification of the titanium electrode: firstly carrying out nano material modification on the pretreated titanium electrode, and then carrying out functional molecule modification. The invention further discloses a chemically modified titanium-based sensor, application of the chemically modified titanium-based sensor and a method for detecting the titanium content. According to the chemically modified titanium-based sensor provided by the method, the selective adsorption capacity to titanium ions is improved, the accuracy and the reliability of an analysis result are improved, high-sensitivity detection of the titanium content can be realized, and the concentration range is wide.