426 results about "Phosphate ion" patented technology

The invention relates to bionic matrix hydrogel for constructing bone organs and a preparation method of the bionic matrix hydrogel. The bionic matrix hydrogel is prepared from a bone acellular extracellular matrix, a salmon DNA (Deoxyribose Nucleic Acid) network and a calcium phosphate oligomer under the combination of photo-crosslinking and self-assembly physical crosslinking. The acellular extracellular matrix in the bionic matrix hydrogel can simulate organic components in natural bones, the calcium phosphate oligomer can simulate inorganic components in the natural bones, and sufficient phosphate ions can be provided for biomineralization due to introduction of a DNA network. The biomimetic matrix hydrogel can replace Matrigel to act in bone organoid culture, provide a living environment similar to bone tissue for three-dimensional culture cells, enhance substance exchange and signal transduction between cells, promote proliferation, adhesion and osteogenic differentiation of bone marrow mesenchymal stem cells, and further accelerate the process of biomineralization. The invention provides an optional new material for preparing the functional bone organ.

The invention discloses a positive electrode material of an upward flow type electrochemical dephosphorization system, and the preparation method comprises the following steps: preparing a polyaniline-coated ZIF-8 derived carbon loaded magnesium-aluminum double-metal hydroxide electrode material, and the preparation process comprises ZIF-8 carbonization in a nitrogen atmosphere, aniline oxidation polymerization, and loading of magnesium-aluminum double-metal hydroxide by a coprecipitation method; the electro-adsorption positive electrode material belongs to a polyaniline magnesium aluminum double-metal hydroxide mesoporous synergistic platform in ZIF-8 derived carbon, and has a nano frame with strong pore accessibility and high electrochemical activity; the synergistic process comprises attraction of polyaniline to phosphate ions and trapping of the magnesium-aluminum double-metal hydroxide. The electrode prepared by the method has a unique mesoporous framework, a large number of phosphorus removal sites are obtained on the surface of the electrode, a rapid ion storage behavior mainly based on a capacitance control process is realized on a solid-liquid interface, phosphate in water can be effectively separated in an electro-adsorption system, and the method is a pollution control process with a clear mechanism.

The invention provides a method for degrading organic phosphorus and recycling phosphorus in water in an ozone oxidation system. According to the method, a mode of adding iron or iron salt solution step by step is innovatively adopted, so that the degradation rate of phosphorus-containing organic matters in water, the generation rate of phosphate radicals and the removal of total phosphorus in water are remarkably improved. Besides, the treatment effect is evaluated by monitoring the organophosphorus mineralization rate (taking the generation amount of phosphate radicals as an index) and the removal rate of total phosphorus in water, experiments show that the method can increase the organophosphorus mineralization rate by 30% or above, and the removal rate of total phosphorus reaches 95%. Compared with the conventional one-time addition of iron or iron salt, the method has the advantages that the mineralization rate of organophosphorus and the removal rate of total phosphorus are effectively improved through a step-by-step addition strategy, the direct precipitation of an organophosphorus intermediate product is promoted, the use amount of ozone and the addition amount of iron are remarkably reduced, the reaction time is greatly shortened, and the recovery efficiency of phosphorus resources is further improved. The method is low in cost and suitable for advanced treatment of organic phosphorus-containing wastewater in the industries of pesticides, electroplating and the like.

The invention belongs to the technical field of wastewater treatment, and particularly relates to multi-element doped synergistically modified ferrihydrite as well as a preparation method and application thereof, and the ferrihydrite is doped with at least one rare earth element and at least one of an aluminum element and a silicon element; the doping amount of the rare earth elements in the ferrihydrite is 0.5-20wt%; the doping amount of the aluminum element in the ferrihydrite is 0-20wt%; the doping amount of the silicon element in the ferrihydrite is 0-20wt%. Compared with the prior art, the method solves the problems that in ferrihydrite single-element modification in the prior art, although stability is improved through Al / Si doping, element modification in the same period is limited in improvement of the adsorption capacity, and the specific recognition capacity on phosphate radicals cannot be improved; and the anti-interference performance of the rare earth doped in the complex water matrix still needs to be improved. According to the scheme, rare earth and Al / Si doping are combined, so that improvement of phosphorus adsorption stability, adsorption capacity, specific recognition capability and anti-interference performance of ferrihydrite is realized synergistically.

The invention belongs to the field of sewage treatment, and discloses a two-phase mud film efficient synchronous nitrogen and phosphorus removal process. By integrating biological denitrification and chemical phosphorus removal technologies and adopting a two-phase treatment unit, efficient and synchronous removal of nitrogen and phosphorus in sewage is realized. According to the process, a biological treatment procedure of denitrifying bacteria and nitrifying bacteria under an anaerobic and aerobic alternating condition is utilized, and ammonia nitrogen and nitrate nitrogen in sewage are effectively removed by controlling reaction conditions and formation of a mud film. Meanwhile, ferric salt and polyaluminum chloride flocculants are used for chemical precipitation, phosphate ions form insoluble precipitates by adjusting the pH value and the adding amount, and activated carbon or a zeolite adsorption material is combined for adsorption, so that phosphorus is further removed. The method has the advantages of high treatment efficiency, low operation cost, simplicity and convenience in operation and wide applicability, and an efficient, economic and environment-friendly solution is provided for sewage treatment.

The invention provides a preparation method of a three-dimensional structure ferrous phosphate pigment with corrosion early warning capability, which comprises the following steps: preparing a ferrous ion-containing solution for providing ferrous ions, the ferrous ion-containing solution contains soluble ferrite and a surfactant and does not contain oxidizing ions, the ferrous ion-containing solution is in an acidic environment; preparing an initial mixed solution for providing phosphate ions and ammonium ions; atomizing and spraying the initial mixed solution into a ferrous ion-containing solution to obtain an intermediate mixed solution, carrying out ultrasonic refining on the intermediate mixed solution by utilizing an ultrasonic oscillation and microwave heating auxiliary device, heating and carrying out heat preservation to obtain a final mixed solution; and filtering the precipitate in the final mixed solution, transferring the precipitate to a vacuum environment, and carrying out high-temperature heating treatment to obtain the three-dimensional structure ferrous phosphate pigment with the corrosion early-warning capability, which can have the corrosion early-warning capability.

The invention discloses a preparation method of a composite water treatment agent for aquaculture wastewater treatment. The preparation method comprises the following steps: preparing nitrogen-phosphorus-sulfur ternary doped carbon spheres; carrying out ionic liquid functionalization treatment; growing an inner layer Cu-MOF (Metal Organic Framework); growing Zn / Cu-MOF on the outer layer; performing plasma treatment; the composite water treatment agent is obtained. According to the ternary-doped carbon sphere core in the composite water treatment, rich active sites are provided through N, P and S synergistic doping, the hydrophilicity and ion exchange capacity of the material are remarkably improved through ionic liquid functionalization, rapid diffusion and adsorption of pollutants are promoted, organic matter is efficiently degraded through the catalytic oxidation effect of MOF in an inner layer Cu-rich area, and the composite water treatment efficiency is improved. Meanwhile, ammonia nitrogen is cooperatively treated; phosphate ions are preferentially removed from the Zn-rich area on the outer layer. When the compound water treatment agent is used for treating aquaculture wastewater, organic pollutants and harmful substances such as nitrogen and phosphorus can be effectively removed.

The invention relates to the technical field of bone tissue materials, and discloses a metal-doped biomimetic mineralized dECM cryogel and a preparation method and application thereof.The preparation method of the cryogel comprises the steps that firstly, hyaluronic acid and methacrylic anhydride are mixed in a solvent, the pH value is adjusted, a reaction is conducted, and methacrylic acid hyaluronic acid is obtained; then under the condition of a photoinitiator, mixing the methacrylic acid hyaluronic acid with an acellular extracellular matrix, and performing freezing and crosslinking treatment to obtain the cryogel, and finally, soaking the cryogel in a mineralization solution containing Ca < 2 + > and / or Mg < 2 + >, adding a buffer solution containing phosphite ions, incubating, and washing to obtain the crystal gel. The biomimetic mineralized dECM cryogel prepared by the method disclosed by the invention is good in ion release stability, can significantly improve the migration ability of HUVECs, contributes to promoting proliferation of rMSCs and improving the osteogenic differentiation potential of the rMSCs, and can be used for regeneration and repair of bone defects.

An electrolyte membrane for a battery that cycles lithium ions includes a sulfide-based solid electrolyte, a polymer binder, an inorganic filler, an inorganic lithium salt, and an ionic liquid. The sulfide-based solid electrolyte includes lithium sulfide (Li2S) and at least one element selected from the group consisting of phosphorus (P), tin (Sn), silicon (Si), germanium (Ge), boron (B), gallium (Ga), and aluminum (Al). The ionic liquid includes substantially equimolar amounts of a cation and an anion. The cation includes a complex of lithium (Li+) and an ethylene glycol dimethyl ether, an imidazolium ion, a piperidinium ion, a pyrrolidinium ion, an ammonium ion, a phosphonium ion, or a combination thereof. The anion includes an arsenate ion, a phosphate ion, a sulfonylimide ion, a borate ion, a chlorate ion, or a combination thereof.

The invention relates to the field of fertilizers, in particular to a special fertilizer for disease-resistant crops and a preparation method thereof.The special fertilizer comprises a nutrient core, a microbial agent coating and a medium trace element coating from inside to outside; the nutrient core comprises the following components in parts by weight: 35-40 parts of a nitrogen fertilizer, 20-25 parts of a phosphate fertilizer, 15-20 parts of a potassium fertilizer, 3-5 parts of a synergist and 1-1.5 parts of molasses; the microbial agent coating layer comprises 1-2 parts of a liquid microbial solution, 1-2 parts of a microbial protective agent and 3-5 parts of a microbial agent carrier; the medium trace element coating layer comprises 5-10 parts of a medium trace element fertilizer and 0.8-1.6 parts of a coating agent. According to the disease-resistant crop special fertilizer provided by the invention, the medium trace elements are added in an external wrapping manner, so that the condition that the effectiveness of nutritional ingredients is reduced due to chemical reaction between metal cations of the medium trace elements and phosphate ions in a phosphate fertilizer in a fertilizer production process is avoided.

A method for preparing iron phosphate from an iron phosphorus slag includes: adding the iron phosphorus slag into an alkaline solution to carry out a reaction followed by a solid-liquid separation to obtain a residue and a first filtrate containing meta-aluminate ion and phosphate ion; adding an acid solution into the first filtrate to carry out an aluminum-removing reaction followed by a solid-liquid separation to obtain a second filtrate containing phosphate ion; mixing the residue with an acid solution to carry out a carbon-removing reaction followed by a solid-liquid separation to obtain a carbon residue and a third filtrate containing iron ion, titanium ion, and copper ion; adding metallic iron into the third filtrate to carry out a titanium and copper-removing reaction followed by a solid-liquid separation to obtain a fourth filtrate containing ferrous ion; mixing an oxidant, the second filtrate, and the fourth filtrate to carry out a reaction followed by a solid-liquid separation and a sintering process in sequence to obtain the iron phosphate.

The invention belongs to the technical field of preparation of phosphorus removal agents, and particularly relates to a composite phosphorus removal agent and a preparation method and application thereof. The composite phosphorus removal agent comprises a honeycomb carrier and microspheres, the microspheres are loaded on the honeycomb carrier; the microspheres are prepared from the following raw materials: polyvinylidene fluoride particles, graphene oxide, ZrOCl2 and phosphorus-accumulating bacteria. The composite phosphorus removal agent comprises a honeycomb carrier, microspheres and microcapsules, wherein the microspheres and the microcapsules are loaded on the honeycomb carrier; capturing phosphate radicals in a water body by the microspheres and carrying out biological phosphorus removal and adsorption phosphorus removal; the honeycomb carrier also has the effect of adsorbing phosphate; and the two synergistically remove phosphate in the water body, so that the phosphorus removal effect of the phosphorus removal agent is improved, and the burden of the water body is not increased.

The invention provides a novel D-A-D type fluorescent probe material as well as a preparation method and application thereof. The fluorescent probe material has good stability, the preparation process is simple, and the synthesis condition is mild. Moreover, the D-A-D type fluorescent probe material has good solubility and stability, and a complex of the D-A-D type fluorescent probe material and zinc ions can identify pyrophosphate ions with high selectivity and high sensitivity. The interference of phosphate ions, hydrogen phosphate ions, dihydrogen phosphate ions, fluorine ions, chloride ions, nitrate ions, acetate ions, sulfate ions and carbonate ions is avoided; after the zinc ion complex of the D-A-D type fluorescent probe material is combined with PPi, the fluorescence intensity is remarkably enhanced, the D-A-D type fluorescent probe material has a higher signal-to-noise ratio, in-situ imaging detection of a target object in living cells or tissues is realized, the defects of a traditional molecule and ion detection method are overcome, and the D-A-D type fluorescent probe material is suitable for being widely applied to the field of biological imaging. # imgabs0 #

The invention discloses a repairing agent for repairing a heavy metal polluted solution by strengthening enzymatic phosphate precipitation under an acid rain condition, the repairing agent comprises sodium alginate, phytase and sodium glycerophosphate, and the mass ratio of the sodium alginate to the phytase to the sodium glycerophosphate is (1-3): (2-5): 50. The invention further discloses a method for repairing a heavy metal polluted solution by adopting the repairing agent. The repairing agent disclosed by the invention has the characteristic of higher enzyme activity when being applied under an acid rain condition, phosphate ions required by phosphate precipitation can be formed, and the repairing agent is remarkably beneficial to strengthening the stability of the precipitation; the heavy metal ions are adsorbed through functional groups carried on the surface of sodium alginate, removal of the heavy metal ions in the solution is accelerated, the risk of migration and diffusion of the heavy metal ions can be greatly reduced, and favorable conditions are created for improving the curing efficiency.

The invention relates to the technical field of sewage defluorination, and discloses a sewage defluorination method for enhancing coagulative precipitation by using residual activated sludge microorganisms, which comprises the following steps: (1) activated sludge microorganism adsorption; (2) removing fluorine by coagulating sedimentation and microbial flocculation; the method comprises the following steps: (1) a polymerization stage: adding a fluorine removal agent into a coagulative precipitation tank, and carrying out mixed reaction on the fluorine removal agent and fluoride, phosphate ions and the like in sewage to form a polymer; (2) a flocculation stage: adding cation PAM and activated sludge microorganisms into a coagulative precipitation tank, and further performing chemical flocculation and microbial flocculation; (3) a precipitation stage: chemical sludge and biological sludge generated in the coagulative precipitation tank are precipitated to realize sludge-water separation, and the sludge is discharged to a sludge storage tank; and (3) sludge dewatering. According to the method, the reutilization of residual activated sludge microorganisms of a sewage plant is realized, and the fluorine removal effect of a conventional coagulating sedimentation method is enhanced through adsorption of the activated sludge microorganisms on fluorides and microbial flocculation.

The invention relates to the technical field of adhesive films, in particular to a deacidification type EVA film for solar cells and a preparation method of the deacidification type EVA film, and the deacidification type EVA film comprises the following raw materials: EVA resin, a main cross-linking agent, an auxiliary cross-linking agent, aminated anti-PID composite filler, a composite hydrotalcite deacidification agent, a lubricant, an ultraviolet light absorber, a light stabilizer, an antioxidant and a coupling agent. Phosphate ions are inserted between layers of magnesium-aluminum hydrotalcite, and nano titanium dioxide particles are loaded on the surface of the magnesium-aluminum hydrotalcite, so that the obtained composite hydrotalcite acid remover can effectively adsorb and capture acetic acid released from an EVA (Ethylene-Vinyl Acetate) film, and the purpose of effectively removing and inhibiting acid is achieved; through preparation and amination modification of the anti-PID composite filler, the obtained amination anti-PID composite filler can improve the mechanical property and the anti-PID capability of the EVA film, can capture free acetic acid in the EVA film and neutralize the free acetic acid into salt, further plays a role in deacidification, and improves the aging resistance of the EVA film.

The method for producing iron phosphate using iron phosphorus slag includes the steps of adding iron phosphorus slag to an alkaline solution, reacting the slag, and then performing solid-liquid separation to obtain a filter cake and a first filtrate containing metaaluminate ions and phosphate ions; adding an acid solution to the first filtrate to perform a dealumination reaction, and then performing solid-liquid separation to obtain a second filtrate containing phosphate ions; mixing the filter cake and the acid solution to perform a decarbonization reaction, and then performing solid-liquid separation to obtain a third filtrate containing iron ions, titanium ions and copper ions; adding metallic iron to the third filtrate to perform a detitanization and decopperization reaction, and then performing solid-liquid separation to obtain a fourth filtrate containing ferrous ions; and mixing an oxidizing agent, the second filtrate, and the fourth filtrate to react with each other, and then performing solid-liquid separation and sintering in this order to obtain iron phosphate.

The invention belongs to the technical field of fluorescent sensing materials, and particularly relates to a ratio metering type fluorescent probe based on a metal organic framework (MOF) material as well as a preparation method and application of the ratio metering type fluorescent probe. The probe material emits blue light, after 2, 6-dipicolinic acid (DPA) is added, the DPA enhances fluorescence emission of Tb < 3 + > and inhibits emission of coumarin through an antenna effect, the fluorescence intensity ratio (I548 / I429) between two emission bands is changed, a good linear response relation is shown in the concentration range of 0-90.0 mu M, the detection limit is 0.13 mu M, and high-sensitivity ratio type detection of the DPA is achieved. After detection is finished, phosphate radical (PO4 < 3->) ions are added, so that the antenna effect can be effectively quenched, the initial fluorescence state is recovered, and meanwhile, the method can be used for detecting the concentration of phosphate radicals. After DPA is added again, reactivation can be realized, so that recycling can be realized, and the limitation of disposable use of a traditional fluorescent probe is broken through.

The present solution provides a preparation method for a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability, including following steps: preparing a ferrous ion-containing solution for providing ferrous ions, where the ferrous ion-containing solution includes a soluble ferrous salt and a surfactant but no oxidizing ions, and the ferrous ion-containing solution is maintained in an acidic environment; preparing an initial mixed solution for providing phosphate ions and ammonium ions; and performing ultrasonic refinement, heating, and holding on the intermediate mixed solution using an auxiliary device with ultrasonic oscillation and microwave heating functions to obtain a final mixed solution; and filtering out precipitates from the final mixed solution, and then transferring the precipitates to a vacuum environment for high-temperature heating treatment to obtain a three-dimensional structured ferrous phosphate pigment with corrosion early warning capability.

The invention relates to the technical field of non-ferrous metal hydrometallurgy, in particular to a method for separating molybdenum and rhenium from molybdenum smelting waste acid by using resin, which comprises the following steps: adding a phosphorus source into the molybdenum smelting waste acid, and then adjusting the acidity to an acid environment in which the hydrogen ion concentration is greater than or equal to 1mol / L; molybdenum and rhenium in the molybdenum smelting waste acid with the acidity adjusted are separated through weak-base anion exchange resin, and a rhenium product with the lower molybdenum impurity content is obtained. According to the method, the phosphorus source is added into the molybdenum smelting waste acid, so that phosphate ions are hydrolyzed from the phosphorus source, molybdenum can be effectively prevented from being adsorbed by the alkalescent anion exchange resin, the selectivity of the anion exchange resin to rhenium is greatly improved, and the rhenium recovery rate and the molybdenum-rhenium separation effect are improved; the problems that in the prior art, ion exchange resin is difficult to adapt to molybdenum-rhenium separation under the high molybdenum concentration, the rhenium recovery rate is low, the rhenium-molybdenum separation effect is poor, and a high-molybdenum-concentration solution cannot be treated are solved.

The invention discloses a semiconductor industry fluorine-containing wastewater treatment system and method. The treatment system comprises an adjusting unit, a pretreatment unit, a phosphorus recovery unit, a biochemical treatment and membrane separation unit and a phosphorus release and calcium removal unit. The phosphorus release and calcium removal unit is used for releasing phosphorus in the membrane separation concentrated water and enabling the phosphorus and partial hydrolytic acidification water of the biochemical treatment and membrane separation unit to enter the phosphorus recovery unit after being subjected to rotational flow enrichment; the phosphorus recovery unit is used for inducing calcium ions and phosphate radical ions in the wastewater to quickly form calcium fluoride and calcium phosphate by taking unprecipitated calcium fluoride, newly generated calcium fluoride and calcium phosphate and calcium fluoride refluxed by the phosphorus release and calcium removal unit as crystal nucleuses by utilizing the high pH value of the pretreatment unit; and finally, the calcium ions are removed from the system in a physicochemical sludge discharge and phosphorus product recovery mode, so that the influence of the calcium ions on the MBR membrane is reduced, the phosphorus recovery rate is improved, the use amount of the precipitant and the sludge amount are reduced, the medicament consumption is reduced, and the stable operation of the biochemical system is ensured.

The invention relates to a preparation method of iron phosphate, and discloses low-sulfur porous iron phosphate and a preparation method thereof. The preparation method of the low-sulfur porous iron phosphate comprises the following steps: providing a mixed solution which contains iron ions, phosphate ions and sulfuric acid; controlling the temperature of the mixed solution to be 60-80 DEG C, and preserving heat and aging for 10-20 hours to obtain slurry containing iron phosphate; extracting a solid from the slurry and washing for multiple times; the washed solid is subjected to microwave drying, the drying temperature is set to be 350-400 DEG C, and the frequency is set to be 2400-2500MHz. The preparation method is short in technological process and low in energy consumption, and the prepared iron phosphate is low in sulfur content, is of a porous structure, is applied to a battery, facilitates permeation of an electrolyte and intercalation and deintercalation of lithium ions, and can enable the battery to have high circularity.

The invention discloses a preparation method of atomic layer deposition synergistic doping modified sodium vanadate, which uses water as solvent, anhydrous sodium iodide and monohydrated vanadium oxyphosphate as sodium source, vanadium source and phosphorus source, and introduces cobalt acetate tetrahydrate and nickel acetate tetrahydrate, and realizes one-step hydrothermal synthesis of HNaV6O assembled by nanosheets and co-embedded with cobalt ions, nickel ions and phosphate ions by synergistically controlling their concentration and ratio, reaction temperature, reaction time and other parameters. 16 ·4H2O nanoflower structure. This method has a simple reaction process, low temperature, easy control, and does not require large equipment and harsh reaction conditions. On this basis, the atomic layer deposition technology was used to successfully realize the cobalt ion, nickel ion and phosphate ion co-embedded HNaV6O with ultra-thin nanoscale metal oxides. 16 Uniform coating of 4H2O positive electrode material. The present invention provides the application of the material in the positive electrode material of sodium ion battery.

The invention discloses a preparation method of a hydroxyapatite pre-filling needle, which comprises the following steps: dispersing low-viscosity sodium carboxymethyl cellulose in water, adding a calcium salt solution, and uniformly mixing, so that part of sodium ions are replaced by calcium ions; adding a sodium carboxymethyl cellulose solution with medium viscosity; 3) adding a solution of phosphate or hydrophosphate or dihydric phosphate or a mixed salt of phosphate or hydrophosphate or dihydric phosphate, adjusting the pH value to 10-11, uniformly mixing, and standing for 1-7 days C, wherein the amount of phosphate ions is 40-60% of the amount of calcium ions; a calcium salt solution is added, the amount of calcium ions accounts for 60%-80% of the total amount of positive ions in the low-viscosity carboxymethyl cellulose and the medium-viscosity carboxymethyl cellulose, and the mixture is evenly mixed and aged for 1-7 days; and if necessary, filtering by using a nanofiltration membrane to remove small molecular substances. The pre-filling needle can achieve the unification of quick effect, high efficiency and slow release.

The invention discloses a novel bacillus, the preservation number of which is CGMCC (China General Microbiological Culture Collection Center) No. 1.62901, and the preservation date of which is September 20, 2024. Gene identification shows that the strain belongs to a new microbial species in taxonomy. Researches show that the strain has nitrogen fixation capacity, can grow in a Mengjinna inorganic phosphorus culture medium, exerts phosphorus dissolving capacity, converts insoluble phosphorus elements which are difficult to absorb and utilize by organisms into dissolved phosphate ions which can be efficiently absorbed and utilized by plants, and provides a large number of nutrient substances for crop production; in addition, the strain has good endurance capacity to low-temperature and high-salt environments, and can play an environment restoration function in the low-temperature environments or saline-alkali areas. Therefore, the novel bacillus disclosed by the invention has better application potential and prospect in the aspects of agricultural production (microbial phosphate solubilization) and environmental restoration.

The invention provides a resource utilization method of a lithium-containing mother solution and a resource utilization device of the lithium-containing mother solution. The resource utilization method of the lithium-containing mother liquor comprises the following steps: providing the lithium-containing mother liquor containing lithium ions and sulfate ions; mixing the lithium-containing mother solution with a phosphate solution, and performing lithium precipitation treatment to obtain lithium-containing slurry; carrying out solid-liquid separation treatment on the lithium-containing slurry to obtain pre-adsorption liquid and a first solid material; adsorbing lithium ions in the adsorption pre-solution by adopting a titanium adsorbent to obtain an adsorption tail solution; and carrying out concentration and crystallization treatment on the adsorption tail liquid, wherein the ratio of the amount of substance of lithium ions in the lithium-containing mother solution to the amount of substance of phosphate ions in the phosphate solution is 3: (0.7-0.8). The resource utilization method of the lithium-containing mother liquor can improve the lithium recovery rate and the purity of the recovered product.

The invention belongs to the technical field of adsorbents, and particularly relates to a lanthanum ion modified zeolite adsorbent as well as a preparation method and application thereof. Compared with the prior art, the method has the advantages that sodium ions are used for replacing aluminum ions which are originally large in size in the artificial zeolite to enable the salt-modified artificial zeolite material to have higher surface activity, then high-temperature calcination is used for removing impurities which are firmly combined with a pore channel structure in the artificial zeolite material, and the surface activity of the material is further improved; lanthanum in the lanthanum ion modified zeolite adsorbent exists in the form of lanthanum oxide after the lanthanum ion modified zeolite adsorbent is calcined, the surface of the lanthanum ion modified zeolite adsorbent is in an electron-deficient state and is expressed as Lewis acid, the lanthanum ion modified zeolite adsorbent is combined with water molecules to form hydrated oxide, and the hydrated oxide can generate electrostatic adsorption with phosphate ions to generate a complex; the method realizes efficient adsorption of phosphorus and fixation of phosphorus in sediments, so that the effect of removing phosphate radicals in the water body is achieved, the material cost is low, and the method has a good application prospect in the aspects of eutrophication treatment and emergency treatment of the water body.

The invention provides a step-by-step recycling and high-valuing method for sludge phosphorus, and belongs to the technical field of sludge treatment and recycling. The method comprises the following steps: carrying out pyrohydrolysis reaction and acid leaching treatment on phosphorus-containing sludge to obtain first phosphorus-rich supernate; under the temperature control condition, by adjusting the molar ratio of iron ions to phosphate ions in the first phosphorus-rich supernate and the pH value, a first crystallization reaction is carried out, and iron phosphate and second phosphorus-rich supernate are obtained; and then, adjusting the molar ratio and the pH value of calcium ions to phosphate ions in the second phosphorus-rich supernate, and carrying out a second crystallization reaction to obtain hydroxyapatite. Lithium iron phosphate can be synthesized by taking the iron phosphate as a raw material through a carbon thermal reduction method; the hydroxyapatite is used as a raw material, and the iron calcium phosphate is prepared through a solid-phase synthesis method. According to the method, the sludge phosphorus recovery rate is increased by more than two times, the phosphorus recovery chemical product value is high, and the value closed loop of sludge phosphorus recovery is realized for the first time.

The invention discloses a cobalt-free lithium-rich manganese-based positive electrode material based on bulk phase anion doping modification and a preparation method thereof, the chemical formula of the positive electrode material is 0.7 LiNi < 1-x > Mn < x > O < 2-0.3 > Li < 2 > Mn < O3 >, x is greater than 0 and less than 1, and the molar doping amount of PO4 < 3-> is 0.5-3%. The preparation method comprises the following steps: dissolving a nickel source, a lithium source, a manganese source and phosphate in deionized water to prepare a metal ion mixed solution, adding a dispersing agent, and uniformly stirring to obtain a dispersed solution; dissolving a complexing agent into deionized water to obtain a complexing agent solution; adding a complexing agent solution into the dispersion solution, and uniformly stirring to obtain a mixed solution; and carrying out spray drying and sintering to obtain the positive electrode material. The positive electrode material is a cobalt-free lithium-rich manganese-based positive electrode material which is doped with phosphate ions in a bulk phase or co-doped with the combination of the bulk phase and the body surface, so that the first coulombic efficiency of 0.1 C of the positive electrode material can reach about 80%, the capacity retention rate of 1C can reach 90% or above, and the positive electrode material has excellent electrochemical performance.

The invention discloses a method for preparing ferromanganese phosphate MnxFe (1-X) PO4, which comprises the following steps of: mixing a manganese pyrophosphate complex solution and an iron phosphate complex solution, and decomplexing to form ferromanganese phosphate precipitate; wherein the manganese pyrophosphate complex is formed by manganese III ions and pyrophosphoric acid; the iron phosphate complex is formed from phosphate ions and iron III ions. According to the preparation method of the ferromanganese phosphate, the ferromanganese phosphate product can be stably obtained, and the proportion of Mn to Fe in the ferromanganese phosphate can be adjusted according to needs.