17 results about "Phosphate adsorption" patented technology

The invention belongs to the field of biochar adsorbing materials, and relates to a method for preparing modified biochar with aquatic plant waste and hematite. The method includes the following steps: (1) naturally drying aquatic plants prior to crushing to obtain aquatic plant powder; (2) crushing the hematite to obtain hematite powder; (3) weighing the hematite powder prior to putting the hematite powder into deionized water, and performing ultrasonic treatment to obtain suspension; (4) weighing the aquatic plant powder, soaking the aquatic plant powder in the suspension, and stirring and drying to obtain fully mixed aquatic plant and hematite mixture; (5) weighing the fully mixed aquatic plant and hematite mixture, putting the mixture in a batch-type atmosphere furnace, and feeding nitrogen into the furnace; performing temperature programming to the target temperature, and maintaining final-temperature pyrolysis; after the pyrolysis process is finished, obtaining the target product, namely the modified biochar. The modified biochar has strong adsorbability in nitrate and phosphate, high in stability and reusable.

This invention relates to a highly efficient functional ceramsite for purifying phosphorus-containing wastewater, its preparation method, and its application. Based on a complementary functional strategy, it uses natural clay rich in Al2O3 and SiO2 as a binder and calcium-rich industrial solid waste as the calcium-rich active component. Functional additives are also added to mitigate pH changes caused by calcium oxide reactions. The above raw materials are calcined at high temperature to obtain inexpensive, calcium-rich functional ceramsite with high mechanical strength, large adsorption capacity, and ecological safety. This effectively solves the common problems of increased water pH and poor phosphate adsorption capacity at neutral pH in calcium-based ceramsite, achieving highly efficient phosphorus purification in water. This invention uses inexpensive and readily available natural clay and calcium-rich industrial solid waste as raw materials, resulting in low cost, good effect, and effective application in the treatment of low-pollution water.

The invention belongs to the technical field of sewage treatment equipment, and particularly relates to a high-spinning-state sulfur-ferrihydrite adsorption material for a fixed bed, a preparation method and fixed bed adsorption equipment. According to the high-spin-state sulfur-ferrihydrite adsorption material for the fixed bed, in the preparation process, through the weak field ligand effect of sulfur, a FeO6 octahedron of ferrihydrite is triggered to generate remarkable Taylor (Jahn-Teller) distortion, Fe < 3 + > is induced to be converted into a high-spin state, spin polarization is regulated and controlled, part of low-spin-state Fe < 3 + > ions are promoted to be converted into the high-spin state, and the high-spin-state sulfur-ferrihydrite adsorption material for the fixed bed is obtained. The high-spin-state sulfur-ferrihydrite is obtained, the affinity with phosphate is enhanced, and the phosphate adsorption performance of the ferrihydrite is improved at present; the high-spinning-state sulfur-ferrihydrite is filled into fixed bed adsorption equipment, so that pollution of wastewater and sewage discharge to natural water bodies such as underground water, rivers and oceans can be effectively reduced, and the phenomena of algae bloom and red tide are avoided.

The invention provides a lanthanum modified magnetic nano carbon adsorbent as well as a preparation method and application thereof, and belongs to the technical field of water treatment. The method comprises the following steps: performing catalytic pyrolysis on biomass by Fe < 3 + > to form hierarchical porous biochar; epitaxially growing a Fe3O4 magnetic layer by a hydrothermal method; carrying out free radical polymerization grafting on poly (1-vinyl imidazole); and La < 3 + > coordination loading and alkali activation. When 0.03 g / L (pH is 3-4) of the obtained adsorbent is added into phosphorus-containing wastewater, the 30-min phosphate removal rate is larger than or equal to 94%, the Langmuir adsorption capacity is larger than or equal to 117.32 mg P / g, and the adsorption retention rate is larger than or equal to 90% and the La dissolution rate is smaller than or equal to 0.2% after five times of circulation. According to the lanthanum modified magnetic nano-carbon adsorbent as well as the preparation method and the application thereof, lanthanum modification is performed on the magnetic nano-carbon, so that the obtained lanthanum modified magnetic nano-carbon adsorbent has the advantages of high adsorption capacity on phosphate in a water body, good selectivity, high removal rate, easiness in separation and recovery, small mass loss, no dissolution, no secondary pollution problem and the like.

The invention provides modified biochar for selectively removing phosphate in sewage and sewage treatment.The modified biochar is prepared through the following method that after a biomass material is subjected to pyrolysis carbonization to form biochar, the biochar and ferric salt are subjected to chemical precipitation, and magnetic biochar is obtained; the preparation method comprises the following steps: carrying out coupling modification on magnetic biochar through an amino silane coupling agent to form aminated magnetic biochar, carrying out a Schiff base reaction on the aminated magnetic biochar and hydroxaldehyde, and adding lanthanum salt to carry out an in-situ complexation reaction so as to obtain the modified biochar. According to the modified biochar for selectively removing the phosphate in the sewage and sewage treatment, the biochar is subjected to iron and lanthanum modification, and the obtained modified biochar has the advantages of being high in adsorption capacity on the phosphate in a water body, good in selectivity, high in removal rate, easy to separate and recycle, small in mass loss, free of dissolution, free of secondary pollution and the like.

The invention belongs to the technical field of water treatment, and particularly relates to a rare earth element doped ferrihydrite adsorbent with the surface modified with betaine and a preparation method and application thereof.The adsorbent takes the rare earth element doped ferrihydrite as a matrix, the surface of the ferrihydrite is modified with betaine molecules, and an organic-inorganic hybrid structure is formed; at least one rare earth element is doped in the ferrihydrite, and the doping amount of the rare earth element in the ferrihydrite is 0.5-20wt%; the mass percentage of the betaine molecules in the adsorbent is 1-20wt%. Compared with the prior art, the invention solves the problem that the phosphorus adsorption material in the prior art is difficult to give consideration to high adsorption capacity, high selectivity, good dispersibility and long-term stability at the same time. According to the scheme, rare earth doping and betaine surface modification are combined to synergistically realize comprehensive improvement of the adsorption capacity, selectivity and complex water body interference resistance of the adsorbent on phosphate.

Pollution by phosphates affect aquatic life as they have side effects even at very low concentrations. Silica molybdate is prepared by first chlorinating silica sand using phosphorous pentachloride to give chlorinated silica which is aminated using ethylenediamine and thereafter treated with sodium molybdate. The molecular structure of the silica molybdate was characterized using Fourier Transform Infrared (FT-IR). FT-IR results showed Adsorption bands at 854cm-l and 542cm-l which were attributed to Mo=O and Mo-O stretching in molybdate. Peaks observed at 1388 and 1662cm-1 were attributed with the vibration mode of Mo-OH bond and bending mode of adsorbed water. Spectra peaks observed at 542, 634.58 and 898.97 cm-1 were attributed to the adsorption of molybdate. The physical adsorption parameters which were examined using batch adsorption system were; temperature, pH, contact, time, initial concentration using sorption models, adsorption kinetics and thermodynamics. Results showed that optimum pH for biosorption of P042- was 6.0, optimal contact time was 30 minutes, optimum temperature was 45°C. The experimental results obtained showed that the maximum phosphate adsorption of silica molybdate at optimum conditions was found to be 94.73% in water.

A biomass / iron-based organic framework composite and a preparation method and use thereof are provided. The preparation method includes: adding chitosan, an iron-based organic framework MIL-88(B), and a crosslinking agent to an acetic acid solution, thoroughly mixing, and heating in a water bath; and adding a mixed solution dropwise, and allowing a reaction to produce the biomass / iron-based organic framework composite. The biomass / iron-based organic framework composite prepared by the present disclosure has a phosphate adsorption capacity of 1.1 mmol / g, which is higher than the corresponding adsorption capacities of a pure iron-based organic framework material and a pure biomass-based material. Under the optimal adsorption pH condition, a loss of an iron-based organic framework material is less than 1%.

The invention relates to the technical field of environmental functional materials, and particularly discloses sewage treatment rubber balls with microorganisms embedded in an MgFe-LDO / AC composite material as well as preparation and application of the sewage treatment rubber balls. Activated carbon is subjected to acid pickling and high-temperature calcination to form a porous carrier, MgFe-LDO is loaded through a hydrothermal synthesis method to construct a composite material, and a bacterial-algae symbiotic system and a sodium alginate gel embedding technology are combined to prepare the composite functional rubber ball. Compared with a common immobilized rubber ball, the rubber ball has the phosphate adsorption memory effect of MgFe-LDO and the NH4 < + > adsorption performance of activated carbon, is especially suitable for a decentralized sewage treatment system with low C / N ratio and high load fluctuation, and provides an efficient and stable solution for synchronous nitrogen and phosphorus removal.

The invention belongs to the technical field of water treatment, and particularly relates to a hydrogel loaded betaine modified rare earth element doped ferrihydrite adsorbent and a preparation method and application thereof, the adsorbent comprises an active component dispersed and fixed in a gel skeleton; the active component is ferrihydrite doped with rare earth elements, the surface of the ferrihydrite is modified with betaine molecules, the mass percentage of the betaine molecules in the active component is 1-20 wt%, and the doping amount of the rare earth elements in the ferrihydrite is 0.5-20 wt%; the gel skeleton is a hydrogel network formed by crosslinking sodium alginate and chitosan through divalent or trivalent metal ions. Compared with the prior art, the problem that an existing phosphate adsorbent is improved only aiming at single performance and lacks integrity improvement is solved. According to the scheme, the rare earth element doped ferrihydrite nano adsorbent of which the surface is modified by betaine is loaded in a natural polymer hydrogel network, so that advantage complementation and synergistic interaction of active components and structural frameworks are realized.

The application provides a preparation and application of a porous lanthanum-based metal organic framework La MOF-X-C adsorbent. The preparation comprises: taking La(NO3)3.6H2O and two ligands of H2BDC and NH2-BDC, wherein the mass percentage of NH2-BDC in the total mass of the two ligands is X, and the value range of X is 5% to 30%; after being transferred into a high-pressure reaction kettle, the mixture is subjected to ultrasonic treatment in a beaker, reaction, cooling and the like to collect powder, and the powder is placed into a quartz crucible and calcined in a muffle furnace at 350 DEG C for 7 h to remove NH2-BDC in the ligand and obtain the La MOF-X-C adsorbent. Preferably, the mass percentage X is 20%. The application further provides a method for preparing a filter membrane by using the La MOF-20%-C adsorbent and an application of the La MOF-20%-C adsorbent as a phosphorus removal adsorbent. The application significantly reduces energy consumption and shortens time. The adsorbent has excellent phosphate adsorption capacity and sterilization effect.

The application provides a phosphate adsorbent and a preparation method and application thereof. The specific surface area of the clay-iron composite prepared by the application is 87.6 m 2 / g, which is higher than 63.6 m 2 / g of the clay. The adsorbent prepared by the application has a large specific surface area. The adsorption capacity of the clay-iron composite prepared by the application to the phosphate is 1.936 mg / g, and the adsorption rate is 88.165%. The bentonite selected by the application has a strong phosphate adsorption capacity and an expansion structure, which is beneficial to the loading of iron. After the iron is combined with the bentonite, the iron ion solution and the composite are separated, and then the iron oxide is synthesized again. Compared with the prior art of directly mixing the iron oxide and the clay mineral or synthesizing the iron oxide in the state that the clay mineral is dispersed in the iron ion solution, the method of the application retains the increased phosphate adsorption capacity of the iron oxide and reduces the content of iron in the composite, and has a higher environmental protection value.

The invention relates to a preparation method of lanthanum carbonate tetrahydrate, which comprises the following steps: by taking an ammonium bicarbonate solution as a precipitator and a lanthanum salt solution as a raw material, adding the ammonium bicarbonate solution into the lanthanum salt solution (70-100 DEG C) in a forward precipitation manner, preparing amorphous lanthanum carbonate precursor precipitate after feeding is finished, and aging for 2-8 hours at the temperature of 10-59 DEG C to obtain the lanthanum carbonate tetrahydrate. Filtering, washing and drying the lanthanum carbonate tetrahydrate precipitate to obtain the lanthanum carbonate tetrahydrate compound. The method has the advantages of simple and controllable process, low preparation cost and high product purity, and is suitable for industrial production of pharmaceutical grade phosphate adsorbents.

The invention discloses a preparation method of a broad-spectrum pH-applicable high-performance phosphorus-removing lanthanum-based MOF composite adsorption material, a lanthanum-based adsorbent (HS) 2-La-MOF is prepared by taking MOFs as a matrix, and a sulfydryl group (-HS) is introduced into the material to form a stable La-S bond with central metal lanthanum (La), so that the structural stability of the material is effectively improved. Meanwhile, La and phosphate are promoted to further form a La-O-P inner-layer complex, and efficient removal of phosphate is achieved; furthermore, a nano confinement effect is provided by adding a GA material, and the lanthanum-based adsorbent composite material GA / (HS) 2-La-MOF is obtained. The two materials prepared by the invention can stably and efficiently remove phosphate in a water body in a wide pH range, the two materials still keep excellent phosphorus removal performance under an alkaline condition, the chemical stability is obviously superior to that of a conventional lanthanum-based MOF material, and the lanthanum-based MOF composite material is a phosphate adsorbent with a great practical application prospect.

An improved phosphate adsorbent based on mercapto click chemistry and its preparation method are disclosed. Modified chitosan and modified arginine, obtained by silane coupling agent modification, are used as raw materials. After obtaining arginine-functionalized chitosan particles through click chemistry, glutaraldehyde is used as a crosslinking agent and phosphate as a template. During the aerogel crosslinking process, combined with imprinting modification, the spatial structure of arginine is reorganized to prepare the aerogel adsorbent. This invention achieves the connection of functional monomers through click chemistry, followed by imprinting modification using phosphate as a template to obtain the aerogel adsorbent. It exhibits excellent selective phosphate adsorption in severely disturbed aquatic environments, and the phosphate adsorption capacity remains essentially unchanged after multiple cycles, promising large-scale and sustainable phosphorus removal from water bodies.

The application discloses a sludge incineration ash phosphorus resource recovery method and system, which comprises the following steps: collecting dewatered sludge cake, placing the dewatered sludge cake in a reaction container, and performing drying, crushing, sieving and calcination to obtain sludge incineration ash; preparing selective lanthanum-based nano adsorbent LDC through a hydrothermal synthesis method; performing component content analysis on the obtained sludge incineration ash, calculating the EDTA addition amount according to the obtained heavy metal content of the sludge incineration ash; placing the sludge incineration ash, EDTA and deionized water in a reaction kettle inner liner, placing a stainless steel hydrothermal reaction kettle in an oven, heating to a target temperature for 1 h, naturally cooling to room temperature, removing unreacted precipitates through centrifugation to obtain a leaching liquor, and adding LDC to perform selective adsorption of phosphates. The application simplifies the optimization process of the hydrothermal reaction experiment, greatly improves the sludge incineration ash leaching efficiency, the prepared LDC adsorbent can separate more than 98% of phosphates in the leaching liquor, has outstanding adsorption capacity and good phosphate selectivity.

The invention relates to the field of wetland fillers, in particular to a preparation method of a constructed wetland filler, which is used for solving the problems of slow and limited phosphorus removal effect of the existing constructed wetland filler. According to the filler, ammonium bicarbonate is attached to biomass, pores are generated in the filler after pyrolysis, a high specific surface area and rich anchoring points are provided for functional components, iron oxide is promoted to be dispersed and deeply reduced into zero-valent iron, sodium salt is added to further promote generation of the zero-valent iron, S generated by decomposition of sodium hydrosulfite and the zero-valent iron form an iron sulfide shell, and the iron sulfide shell is separated from the iron sulfide shell. The preparation method comprises the following steps: modifying charcoal obtained by carbonizing reeds by adopting magnesium chloride, fixing thalli in gaps of the modified reed carbon, and spraying the modified reed carbon to the surface of the functional filler. The constructed wetland filler has the advantages of high phosphorus removal capacity, high speed and multiple ways through the synergism of phosphate adsorption sites, precipitation reaction sites and cold-resistant phosphorus-accumulating bacteria in the surface / pores, and can keep high efficiency at low temperature.