477 results about "Ion adsorption" patented technology

The invention discloses a steam condensation type adsorption tower device system for extracting lithium from plateau salt lake brine, and belongs to the technical field of salt lake lithium extraction processes. A condenser of a multi-effect evaporation system and a traditional adsorption tower are coupled into a whole, the optimal temperature in the salt lake brine lithium adsorption process is achieved, and the lithium ion adsorption efficiency of the adsorption tower is improved; latent heat of vaporization released by condensation of secondary steam generated in a last-effect evaporator in a multi-flow tube bundle directly heats salt lake brine for adsorption and desorption processes, so that the adsorption rate of lithium in the salt lake brine is increased, fresh water required by a subsequent desorption process can be preheated, and the energy consumption cost of lithium extraction from the salt lake is reduced; the temperatures of an adsorbent and salt lake brine at different positions in the adsorption tower are optimized by reasonably arranging the flow of the condensation heat exchange tube bundle, the temperature of the adsorbent and the salt lake brine is gradually increased from top to bottom in the adsorption tower, and the temperature in the adsorption tower is increased from top to bottom to compensate the reduction of the adsorption rate caused by the reduction of the lithium ion concentration.

The invention discloses a preparation method and application of a carbon-loaded cobalt nanoparticle and iron monatomic electro-catalytic material, relates to a preparation and regulation method of a zinc air battery cathode catalyst, and solves the problems of low electricity generation performance and poor stability of an existing rechargeable zinc air battery cathode. Specifically, a high-efficiency and stable-catalysis carbon-loaded cobalt nanoparticle and iron monatomic electro-catalysis material is reasonably designed and successfully synthesized by utilizing the adsorption effect of a metal organic framework (MOFs) and polyvinylpyrrolidone as an ion adsorption layer, and under the condition that active sites are not sacrificed, the high-efficiency and stable-catalysis carbon-loaded cobalt nanoparticle and iron monatomic electro-catalysis material can be used for preparing a high-efficiency and stable-catalysis carbon-loaded cobalt nanoparticle / iron monatomic electro-catalysis material. And the dispersity of cobalt nanoparticles and the catalytic activity of iron monatomic are improved. The obtained material is used as a zinc air battery cathode material, the overall performance of a rechargeable zinc air battery can be improved, and efficient and oriented conversion of the zinc air battery is achieved.

The invention provides an ion adsorption type medium and heavy rare earth ore mineralization prediction method which comprises the following steps: (1) screening ion adsorption medium and heavy rare earth mineralization prediction indexes according to mineralization theory understanding; (2) calculating the weight of each prediction index by using an analytic hierarchy process; (3) on the basis of a group decision-making method, calculating an expert weight coefficient, and solving a comprehensive index weight; (4) constructing a membership function of each prediction index by adopting a fuzzy mathematics method, and carrying out membership calculation; and (5) integrating the weight and the membership degree of each prediction index, fitting and constructing an ion adsorption type medium and heavy rare earth mineralization prediction model, and performing mineralization prediction. According to the method, expert cognition is effectively simulated, errors caused by subjective judgment can be remarkably reduced, the reliability of a metallogenic prediction result is improved, compared with a traditional method, the success rate of finding ion adsorption type medium and heavy rare earth ore is greatly increased, and then the prospecting exploration efficiency can be effectively improved.

The invention discloses an application of a microporous and mesoporous metal organic framework microsphere material in organic dye and heavy metal wastewater. According to the invention, mesoporous spheres formed by self-assembly of a block copolymer are used as objects, and regular and highly dense mesoporous micron-sized particles of a self-assembled amphiphilic block copolymer (PS-b-PAA) in a selective solvent mixture are used as a template; uiO-66-NH2 and ZIF-67 micron-sized microspheres which are formed by mutual growth of metal-organic framework nanocrystals and have two pore diameters of micropores and mesopores at the same time are produced, and larger carrying capacity is obtained, so that adsorption separation is more efficiently realized. The adsorbent is respectively used for dye adsorption and heavy metal ion adsorption, and the adsorption performance and mechanism of the adsorbent are explored. The metal organic framework microspheres with both micropores and mesopores are used as an adsorbent, and a simpler, more convenient and novel method is provided for adsorption.

The invention discloses an efficient ion adsorption type rare earth ore deposit prospecting exploration method which comprises the following steps: 1) delineating a prospecting prospecting area indoors through a geochemical exploration weak anomaly extraction technology; 2) investigating the rare earth mineralization enrichment law and the characteristics of rare earth minerals and clay minerals in the prospecting prospective area, carrying out large-scale geological mapping in the field, and delineating a prospecting target area; and 3) quickly positioning and evaluating the rare earth ore body through a field on-site manual percussion drill technology. According to the method, through the technical combination of the rare earth enrichment mechanism, the mineralogy, the chemical exploration weak anomaly extraction technology and the field rapid evaluation technology, rapid prospecting exploration is achieved, the prospecting efficiency and success rate of the rare earth ore are greatly improved, the time is shortened, the procedure is simplified, and the cost is greatly reduced.

The invention provides an arid region saline-alkali soil treatment method which comprises the following steps: step 1, region division: dividing saline-alkali soil into a planting region and a saline-alkali water collection and treatment region; 2, a planting area is constructed, the planting area is composed of an original layer, a first water drainage and salt guide layer, an air permeation prevention layer, a second water drainage and salt guide layer and a planting layer from bottom to top, the air permeation prevention layer can prevent salt from ascending, and the water drainage and salt guide layer can drain saline-alkaline water in soil; and step 3, constructing a saline-alkaline water collection and treatment area, and performing filtration and electro-adsorption salt reduction on the collected saline-alkaline water to realize recycling of the saline-alkaline water. Layered improvement of the planting area is combined with an integrated structure of saline-alkali water collection, ion adsorption and storage, the salt content of soil is reduced, the nutrient content of the soil is increased, and all-round treatment and utilization of'blocking ', 'discharging', 'treating 'and'using' of the saline-alkali water are achieved.

The invention discloses a sewage heavy metal ion detection device, which belongs to the technical field of sewage detection, and comprises a sensor module and a microfluidic module, the sensor module comprises a Loff wave surface acoustic wave device, the Loff wave surface acoustic wave device comprises a resonance area and two Loff wave interdigital transducers, the resonance area is located between the two Loff wave interdigital transducers, and the resonance area is covered with a heavy metal ion adsorption film; the micro-fluidic module comprises a micro-channel system and a Rayleigh wave surface acoustic wave device, the micro-channel system comprises a dropwise adding tank, a micro-channel and a waste liquid tank which are communicated in sequence, the micro-channel is provided with an experimental area overlapped with the resonance area, and the Rayleigh wave surface acoustic wave device is used for driving sewage to move from the dropwise adding tank to the waste liquid tank. By combining a microfluidic technology and a surface acoustic wave technology, heavy metal ions, especially lead ions, in sewage can be rapidly, accurately and conveniently monitored.

The invention discloses a La < 3 + >-doped lithium manganese oxide lithium ion sieve as well as a preparation method and application thereof, and belongs to the technical field of salt lake lithium extraction. The preparation method comprises the following steps: by taking Mn2O3 and LiOH as raw materials, carrying out hydrothermal reaction to generate LiMnO2, mixing the LiMnO2 with La2O3, grinding and calcining to form a La < 3 + >-doped spinel structure precursor La-LMO, and carrying out acid pickling to prepare La-HMO. La < 3 + > replaces part of Mn < 3 + >, the average valence state of manganese is improved, meanwhile, the structural stability of the manganese is enhanced through the high bond energy of La-O bonds, the number of exposed manganese atoms is reduced, manganese solution loss caused by Mn < 3 + > disproportionation reaction in the acid treatment process is effectively inhibited, the adsorbed oxygen content and active sites are increased, and the lithium ion adsorption capacity is remarkably improved. The material has high-selectivity adsorption capacity on lithium ions in salt lake brine in a strong alkaline environment, the manganese solution loss rate is obviously lower than that of traditional HMO, the cycle life is remarkably prolonged, and the industrial application potential is remarkably improved. The preparation process of the lithium ion sieve is simple, the raw material cost is low, and the technical bottlenecks that an existing manganese-based lithium ion sieve is poor in structural stability and high in manganese solution loss are solved.

The invention belongs to the technical field of lithium adsorbents, and particularly relates to lithium ion sieve hydrogel with double properties and a preparation method and application thereof. According to the prepared lithium ion sieve hydrogel, ions (Al, Fe and the like) with the same valence state and different sizes are used for replacing part of manganese ions, so that the crystal structure of an ion sieve is more stable, an ion channel is wider, and therefore, the lithium ion sieve hydrogel has relatively high lithium ion adsorption capacity and stability; the high adsorption capacity and mechanical strength can still be kept in multiple cyclic adsorption-desorption cycles, the lithium ion adsorption capacity cannot be lost due to dissolution loss of the lithium ion sieve, and the lithium ion sieve has an integral structure while having a large surface area by means of device formation of the hydrogel. Therefore, the method has excellent recovery capability and long service life, can keep the morphology of the device from being damaged in a complex use environment, is convenient to use and recover, and has important theoretical significance and application value.

The invention discloses a mine water fluorine removal agent and a preparation method and application thereof, and belongs to the technical field of wastewater treatment.The preparation method of the fluorine removal agent comprises the following steps that aluminum salt, calcium salt, magnesium salt and ferric salt are added into water to be stirred, then a chelating agent, a hydroxy carboxylic acid compound and a dispersing agent are added, the mixture is heated to 40-60 DEG C to be stirred and dispersed, and heat preservation is conducted. The preparation method gets rid of the constraint of traditional calcium salt, introduces the chelating agent, the hydroxy carboxylic acid compound and the dispersing agent on the basis of controlling the compatibility of the materials and the synthesis reaction process, and utilizes the excellent fluorine ion adsorption performance and flocculation settling performance of the aluminum-calcium-magnesium-iron-based quaternary metal material to improve the fluorine ion adsorption performance of the aluminum-calcium-magnesium-iron-based quaternary metal material. Quaternary metals are assembled into a long-chain porous structure through chelation, the specific surface area and the pore volume are further increased, the contact area with fluorine ions in mine water is increased, and the porous structure adsorbs complexing groups to achieve the purposes of rapid coordination, strong adsorption, precise chelation, flocculating settling and efficient removal of fluoride in mine water.

The invention provides a battery diaphragm with an ion adsorption function and a preparation method thereof. The battery diaphragm comprises a base membrane and a coating layer positioned on at least one side surface of the base membrane, the coating layer comprises coated ceramic particles, and each coated ceramic particle comprises a coating layer composed of a polyimide porous material and a core composed of ceramic particles. According to the battery diaphragm with the ion adsorption function and the preparation method thereof provided by the invention, the coating layer made of the polyimide porous material is formed on the surface of the ceramic particle, so that after the obtained coated ceramic particle is used for the battery diaphragm, non-lithium metal ions dissolved out from a battery positive electrode can be effectively adsorbed, and the service life of the battery diaphragm is prolonged. And the safety, rate, cycle and other performances of the battery are improved.

The invention provides an intelligent prediction method of an ion adsorption type rare earth ore metallogenic target region based on a deep neural network, and provides a novel convolutional neural network model RCACNet fusing cross-level cavity features and attention, and the model adopts a deep residual network as a backbone network. The densely connected cavity space pyramid pooling module, the cross-level feature fusion module and the convolution block attention module embedded in the backbone network are fused, and through cooperative work of the four modules, complex challenges such as similar spectrum, variable scale and fine features of the ion adsorption type rare earth ore target can be effectively handled; therefore, high-precision segmentation is realized.

The invention relates to the field of heavy metal ion recovery, and discloses an organic covalent material and a preparation method thereof, and a composite adsorption film and a preparation method and application thereof. The method comprises the following steps: in the presence of an organic solvent, mixing 2, 5-diamino terephthalic acid and a hydroxyl-containing benzene-1, 3, 5-tricarboxaldehyde derivative for reaction to obtain the organic covalent material. The organic covalent material provided by the invention is compounded with chitosan to prepare a composite adsorption film, and the composite adsorption film can be used for adsorbing heavy metal ions in a water body, is high in heavy metal ion adsorption capacity, can be recycled, and has a relatively great application prospect in the field of heavy metal ion recovery.

The invention relates to the technical field of artificial graphite production, and particularly discloses a preparation method of low-expansion high-capacity artificial graphite. According to the invention, the substance with the decomposition temperature of more than or equal to 1200 DEG C is selected as the additive for coking and graphitizing the residual oil, and is converted into the artificial graphite with a closed-pore structure through a specific process, and the artificial graphite is used as the lithium ion negative electrode material, so that the volume expansion in the charge-discharge process can be effectively reduced, the active lithium consumption caused by repeated rupture of an SEI membrane is remarkably reduced, and the service life of the lithium ion battery is prolonged. And the closed-pore structure can also isolate electrolyte invasion and avoid side reaction, and meanwhile, the mesoporous inner wall provides additional lithium ion adsorption and embedding sites to compensate volume density loss caused by pores, so that the overall performance of the lithium ion battery is remarkably improved. In addition, the residual oil is relatively low in cost, the production value of the residual oil is improved when the residual oil is used as a raw material for preparing the artificial graphite, the production cost of the lithium ion battery is reduced, and the method has obvious economic and market advantages.

The invention relates to a lithium ion sieve adsorbent and a preparation method thereof, a lithium ion sieve adsorbent product and a lithium ion adsorption separation method, the lithium ion sieve adsorbent comprises 50-90% of a lithium ion sieve, 1-20% of a monatomic catalyst and an auxiliary agent, and the auxiliary agent comprises a binder and an optional additive; the lithium ion sieve is selected from a manganese-based lithium ion sieve, and the monatomic catalyst is selected from a nitrogen-doped carbon-based transition metal monatomic catalyst. The lithium ion sieve adsorbent provided by the invention has good lithium ion adsorption and separation capability, and high lithium extraction rate is realized; the lithium ion sieve adsorbent is matched with an eluent of persulfate to perform desorption regeneration after lithium enrichment, dissolution loss inhibition of the manganese-based lithium ion sieve in the desorption or regeneration process is achieved through synergistic reinforcement, and meanwhile the low manganese loss rate and efficient desorption of lithium ions are achieved; the lithium ion adsorption separation method for inhibiting the solution loss of the manganese-based lithium ion sieve, provided by the invention, is simple, efficient and excellent in effect, and can be well applied to industrial production.

The invention relates to analcime with an ANA structure and a preparation method of the analcime, the chemical molecular formula of a unit cell of the analcime with the ANA structure is Na < x > [SiyAlzO96], x is equal to 6-15, y is equal to 30-37, and z is equal to 10-16; the analcime with the ANA structure has a spherical crystal morphology. The analcime with the ANA structure disclosed by the invention has a spherical crystal morphology, shows excellent molecular diffusion performance, and has a good application prospect in the fields of small molecular acid catalytic reaction, small molecular gas adsorption separation, ion adsorption purification and the like.

The invention provides a polymer composite gel for heavy metal ion adsorption and a preparation method and application thereof, diatomite DE, chitosan CS, polyethyleneimine PEI and sodium alginate SA are used as raw materials, and polymer modification crosslinking is promoted through an ionic crosslinking method to form the composite gel. Compared with the prior art, SA is a biodegradable natural polysaccharide material, contains rich hydroxyl and carboxyl functional groups and is used as a controllable modification site, DE is used as an inorganic clay material, has a layered porous structure and contains rich active sites, and CS and PEI polymer surfaces have rich amino and hydroxyl groups and are used as ion adsorption sites. Meanwhile, PEI is used as a nucleation site and an ionic cross-linking agent to promote material modification and cross-linking to form composite gel. The composite gel is used as an ion adsorbent, can be adsorbed through chemical chelation between functional groups and ions, and can also be physically adsorbed through a porous structure, so that the composite gel shows efficient ion adsorption performance.

The invention provides a sodium ion battery capacitor and a preparation method thereof. The sodium-ion battery capacitor comprises a positive pole piece, a negative pole piece, a diaphragm and an electrolyte, the positive pole piece comprises a composite positive pole material, and the composite positive pole material comprises a capacitive material and a layered oxide; the negative electrode plate comprises a composite negative electrode material, and the composite negative electrode material comprises hard carbon and a surface functional group modified porous carbon nanotube. The capacitive material and the layered oxide are synergistically matched to serve as the composite positive electrode material, a three-dimensional porous network structure is formed, and the synergistic effect of the double-electrode-layer capacity and the oxidation-reduction reaction can be improved; the hard carbon and the surface functional group modified porous carbon nanotube are synergistically matched to serve as the composite negative electrode material, so that the sodium ion diffusion path, the electrolyte infiltration area and the charge-discharge efficiency are favorably optimized, and the sodium ion adsorption capacity is improved. The sodium ion battery capacitor has the characteristics of high energy density, high power density, wide temperature range charging and discharging capability and the like.

The invention provides a preparation method of a negative electrode material, the negative electrode material, a negative electrode plate and a battery, and the preparation method comprises the following steps: S1, mixing biomass or a biomass derivative as a hard carbon precursor with sodium silicate, acrylamide, an initiator and a cross-linking agent in a solvent, uniformly stirring, and carrying out a free radical polymerization reaction under a photocatalytic condition to obtain a mixed solution; the first precursor is obtained; s2, the first precursor is soaked in a water-soluble calcium salt solution for a hybrid cross-linking reaction, then acidification is conducted, a second precursor is obtained, and a third precursor of a double-network cross-linked structure is obtained after drying, smashing and sieving; and S3, carbonizing the third precursor in an inert atmosphere, and cooling to obtain the hard carbon negative electrode material, at least solving the technical problems of enhancing the sodium ion adsorption capacity, improving the voltage platform capacity, further improving the electrochemical conversion efficiency and reasonably controlling the cost.

The invention relates to the technical field of separation and purification, in particular to a preparation method of a high-purity scandium oxide adsorbent with a mesoporous silicon-based shell, and aims to solve the technical problems in the prior art. According to the silicon-based adsorbent, the preparation method of the silicon-based adsorbent and the application of the silicon-based adsorbent to adsorption of associated impurities of scandium in rare earth ore liquid, the silicon-based adsorbent containing aluminum is large in scandium ion adsorption capacity and good in selectivity and has good application prospects in the aspect of a rare earth purification process. In order to solve the technical problem, the scheme provided by the invention is as follows: the adsorbent takes amorphous mesoporous silica as a skeleton, and organic functional group solvent mixing treatment is performed after the amorphous mesoporous silica is synthesized, so that resin groups are uniformly distributed on the surface of the skeleton and in the skeleton.

The invention relates to the technical field of modified biochar, in particular to wood vinegar modified biochar, a saline-alkali soil modifier containing the wood vinegar modified biochar and a preparation method of the wood vinegar modified biochar. The invention provides a preparation method of wood vinegar modified biochar, which comprises the following steps: cleaning and drying biochar, adding the biochar into wood vinegar, stirring at room temperature for 0.5-1 hour, adding a potassium permanganate solution, continuously stirring for 2.5-4 hours, carrying out solid-liquid separation, and collecting solids to obtain the wood vinegar modified biochar. The invention further provides the wood vinegar modified biochar, a saline-alkali soil modifier containing the wood vinegar modified biochar and a preparation method of the wood vinegar modified biochar. The saline-alkali soil improver has excellent sodium ion adsorption capacity and plant growth promoting capacity, inorganic acid, organic acid or various microbial strains do not need to be used in the preparation process, the preparation method is simple and feasible, and the saline-alkali soil improver can be widely applied to development and utilization of saline-alkali soil.

The invention relates to the technical field of waste catalyst resource utilization, in particular to a waste SCR denitration catalyst based heavy metal adsorbent and a preparation method thereof.The preparation method comprises the following steps that a waste SCR denitration catalyst is placed in a mixed solution of sulfuric acid and organic acid to be subjected to acid leaching treatment, and after filtering and drying treatment, the waste SCR denitration catalyst is obtained; catalyst powder subjected to acid leaching treatment is obtained; mixing the catalyst powder subjected to acid leaching treatment with a mineral material, adding a metal oxide, and carrying out ball milling treatment in a high-energy ball mill; and adding an organic binder into the ball-milled powder, and uniformly mixing to obtain the heavy metal adsorbent. Through the steps of chemical extraction, physical mixing, activity excitation and the like, the waste SCR denitration catalyst is converted into the composite material with the efficient heavy metal ion adsorption capacity, efficient resource utilization of the waste SCR denitration catalyst is achieved, and meanwhile a new solution is provided for water body heavy metal pollution treatment in China.

The invention discloses a preparation method and application of a Co-based oxide material based on g-C3N4 anchoring, and the preparation method comprises the following steps: (1) calcining an N-containing precursor I to obtain g-C3N4; (2) etching g-C3N4 with an alkaline solution, centrifuging I, and drying I to obtain g-C3N4 rich in defects; and (3) reacting a mixture of the g-C3N4 rich in defects, a Co precursor, 2-methylimidazole and a solvent, centrifuging II, drying II and calcining II to obtain the Co-based oxide material based on g-C3N4 anchoring. The prepared g-C3N4 is rich in defects, more sites are provided for ion adsorption, and subsequent high-load metal oxide generation is facilitated. A heterostructure formed between g-C3N4 and Co3O4, a built-in electric field formed at an interface and defects at the interface greatly improve the gas sensing response.

The invention belongs to the technical field of lithium ion adsorption materials, and relates to a preparation method of a multi-element co-doped lithium-aluminum layered double hydroxide and a lithium extraction adsorbent. The invention discloses a preparation method of a multi-element co-doped lithium-aluminum layered double hydroxide. The preparation method comprises the following steps: (1) dissolving an aluminum salt, a lithium salt and a low-valence metal element salt in water to obtain a precursor solution; (2) slowly adding a bio-based precipitant to adjust the pH value, and heating and stirring for reaction to obtain a precursor colloidal solution; (3) adding a modifier containing a non-metallic element X to adjust the pH value, carrying out ultrasonic dispersion, and transferring to a microwave reaction kettle to carry out a microwave reaction; the lithium-aluminum layered double hydroxide co-doped with the low-valence metal element M and the non-metal surface modification element X is obtained. According to the method, the diffusion rate and the adsorption performance of lithium ions are remarkably improved; according to the lithium extraction adsorbent disclosed by the invention, the adsorption efficiency and selectivity of lithium ions in salt lake brine with a high magnesium-lithium ratio are remarkably improved.

The utility model discloses a mixing device for fluorine ion adsorption filter materials, which belongs to the technical field of industrial wastewater treatment and comprises a mixing tank and a rapping mechanism, the rapping mechanism comprises a support plate, a driving rod is arranged in the center of the support plate, and two ends of the driving rod are respectively connected with a first driving motor and a driving cam; guide grooves are correspondingly formed in the positions, located on the two sides of the driving cam, of the supporting plate, and reset rods and reset springs arranged on the reset rods in a sleeving mode are connected into the guide grooves. The device further comprises a rapping arm, the rapping arm comprises two semicircular rapping semi-rings, a plurality of rapping short rods are arranged in the circumferential direction of the inner walls of the rapping semi-rings at equal intervals, the adjacent ends of the two rapping semi-rings are connected with connecting blocks correspondingly, and the connecting blocks are slidably connected to the reset rods of the guide grooves correspondingly. And the reset springs tightly press the corresponding connecting blocks to the ends close to the driving cams, the driving cams rotate to correspondingly and periodically extrude the connecting blocks to slide outwards along the reset rods, vibration of the mixing tank body can be achieved, and the discharging efficiency of the mixing tank is improved.

The invention discloses a preparation method of an efficient composite photocatalytic material based on MOF loaded CdS in the technical field of photocatalyst materials. The composite material is characterized in that MOF is used as a carrier, and CdS is combined and grows on the MOF through an ion adsorption method to form loaded CdS quantum dots; the porous material constructed by MOF as a carrier has the characteristics of multiple adsorption sites, large specific surface area, good conductivity and the like, CdS can be more stably adsorbed and fixed, transfer and utilization of electrons are promoted, the separation rate of photo-induced electron-hole pairs and the recycling rate of the composite material are effectively improved, the composite material is applied to photocatalytic regeneration of NADH, the yield can reach 77% in 6 min, and the application prospect is wide. The reaction time is effectively shortened, the yield performance is improved, and the material can be recycled for more than 40 times. And a green drug synthesis system for generating (E)-1-chlorine-4-phenyl-3-butene-2-ol by catalyzing the reaction of (E)-4-chlorine-1-phenyl-1-butene under the action of the regenerated coenzyme driven by the P450 enzyme is successfully constructed for the first time.

The invention discloses a preparation method of a high-valence Nb < 5 + > doped H2TiO3 lithium ion sieve, and belongs to the technical field of preparation of inorganic materials. The method is simple and environment-friendly in process, free of organic matters and easy for large-scale production. The unique hollow structure and large specific surface area anatase type TiO2 are adopted as a titanium source, so that the specific surface area, porosity and particle dispersity of the H2TiO3 ion sieve are remarkably improved, adsorption active sites are increased, and the adsorption efficiency and capacity of lithium ions are improved; the structure of the lithium ion sieve is more stable by doping the titanium source with the hollow structure and Nb < 5 + >, and the dissolution loss rate of Ti < 4 + > is reduced. After multiple lithium ion adsorption / desorption cycles, the adsorption capacity of the lithium ion sieve is kept at a high level, and the dissolution loss rate of Ti < 4 + > is extremely low. The ion sieve has high adsorption efficiency, low solution loss rate and good cycle stability, is suitable for the fields of salt lake lithium extraction, lithium-containing wastewater treatment, lithium ion batteries and the like, can significantly improve the extraction efficiency and the battery performance, reduces resource waste and environmental pollution, reduces the production cost, and provides powerful support for technical progress and industrial development in related fields.

Disclosed in the present invention are an acid-resistant noble metal ion adsorption film and a preparation method therefor. The preparation method comprises: a) pretreatment of a base film: firstly, cleaning and drying a silicon carbide substrate to obtain a clean film; then performing oxidation treatment on the clean film to obtain a micro-oxidation film; and finally, placing the micro-oxidation film in a strong acid solution for acidification treatment, to obtain a base film modified with a hydroxyl functional group; b) the growth of an MOF seed crystal: placing the obtained base film modified with the hydroxyl functional group into a seed crystal growth solution, and reacting at 110-130°C for 12-24 hours to obtain a film loaded with the MOF seed crystal; and c) MOF secondary growth: placing the prepared film loaded with the MOF seed crystal into a secondary growth solution, and reacting at 110-130°C for 20-30 hours to obtain the acid-resistant noble metal ion adsorption film. The adsorption film prepared according to the present invention has good acid resistance, and can achieve efficient and stable recovery of rare noble metals in a strong acid environment.

The invention discloses a broad-spectrum response type BiVO4-based photocatalytic electrode and a preparation method and application thereof, and belongs to the technical field of photocatalytic electrodes, the broad-spectrum response type BiVO4-based photocatalytic electrode comprises a conductive substrate and a photocatalyst loaded on the surface of the conductive substrate, and the photocatalyst is composed of BiVO4, a narrow-band gap semiconductor material and a cocatalyst; the preparation method comprises the following specific preparation steps: S1, preparing BiVO4 on the surface of a conductive substrate to obtain a BiVO4 electrode; s2, immersing the BiVO4 electrode into a Co salt solution, and applying potential to enable Co ions to be adsorbed on the surface of the BiVO4 electrode; and S3, immersing the BiVO4 electrode adsorbed with Co ions into a Na2S solution, washing and drying to obtain the wide-spectrum response type photocatalytic electrode. The narrow-band-gap semiconductor material Bi2S3 and the cocatalyst CoSx are prepared on the surface of BiVO4 in situ through an ion exchange method, the light absorption range of the BiVO4-based photocatalytic material can be effectively widened, and the photoelectric response signal of the BiVO4-based photocatalytic electrode under the excitation of visible light and near-infrared light is improved.

The invention provides a chitosan composite material and a compound feed additive, and relates to the technical field of feed additives. The chitosan composite material comprises cross-linked chitosan and a porous carrier, the cross-linked chitosan is coated on the surface of the porous carrier; the porous carrier comprises a first porous carrier and a second porous carrier, the average particle size of the first porous carrier is 80-150 [mu] m, and the average particle size of the second porous carrier is 10-30 [mu] m. The chitosan composite material disclosed by the invention has relatively good heavy metal ion adsorption performance and can be used as a feed additive.