24 results about "Lanthanum hydroxide" patented technology

The invention relates to a dephosphorization material, a preparation method thereof and a dephosphorization method, belongs to the field of water treatment, and solves at least one of the problems of contradiction between adsorption capacity and structural stability, fast capacity fading, short service life, difficult recovery, higher cost and the like of the existing lanthanum-based dephosphorization material. The phosphorus removal material is a nano-porous carbon-supported lanthanum composite material, and comprises an amorphous nano-porous carbon matrix, an amorphous nano-porous carbon carrier, an amorphous nano-porous carbon carrier, and an amorphous nano-porous carbon carrier, and an active component embedded in situ in the nanoporous carbon matrix; wherein the active component comprises lanthanum oxide and / or lanthanum hydroxide. According to the invention, the adsorption capacity is high, the structure is stable, the attenuation of the adsorption capacity is delayed, the service life is prolonged, the cost is reduced, and the adsorbent can be recycled.

Provided here are methods for producing a shaped metal-supported catalyst. One such method includes the steps of mixing a support hydroxide with an aqueous mixture of an active metal compound to form a malleable mixture of an active metal incorporated support hydroxide, passing the malleable mixture through a molding device to produce a shaped metal-supported wet catalyst; and drying and calcining the shaped metal-supported wet catalyst. The support hydroxide contains one or more of aluminium hydroxide, silica hydroxide, zirconia hydroxide, cerium hydroxide, titanium hydroxide, lanthanum hydroxide, gallium hydroxide, or niobium hydroxide. The active metal compound can be one or more of vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, and rhenium.

The application provides a porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction and a preparation method. The preparation method comprises the following steps: adding 4,4-diamino diphenyl ether and pyromellitic dianhydride into a solvent, uniformly mixing, and preparing a polyamide acid precursor spinning solution; electrospinning the prepared polyamide acid precursor spinning solution to prepare polyamide acid nanofibers; immersing the prepared polyamide acid nanofibers in a mixed metal salt solution containing cobalt salt, lanthanum salt and zinc salt to prepare polyamide acid nanofiber precursors loaded with metal ions; and performing programmed temperature heat treatment on the prepared polyamide acid nanofiber precursors loaded with metal ions in a protective atmosphere to prepare the porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction. The prepared porous carbon nanofiber electrocatalyst loaded with cobalt / lanthanum hydroxide heterojunction has excellent electrochemical oxygen reduction reaction and oxygen evolution reaction bifunctional catalytic activity.

The invention provides a multi-element alloy co-permeation agent and application thereof, the multi-element alloy co-permeation agent comprises composite zinc-aluminum alloy powder, Zn powder, composite AIMg alloy powder and a rare earth compound, and the rare earth compound comprises lanthanum hydroxide. By adopting the combination of the composite zinc-aluminum alloy powder, the Zn powder, the composite AIMg alloy powder and the rare earth compound, an efficient anti-corrosion coating can be formed on the surfaces of parts such as railway equipment, bolts and spikes, and the corrosion resistance of the parts is remarkably improved. Especially in an open-air environment, the coating can effectively resist corrosion of wind, sunlight and acidic materials, and the service life of equipment is prolonged.

The present application relates to the technical field of medicine and chemical industry, in particular to a kind of alginate / nano lanthanum hydroxide composite microspheres and its preparation method and application.The composite microspheres use sodium alginate as organic matrix material, and nano lanthanum hydroxide as inorganic filling phase, which are prepared by electrospray technology, and can realize the uniform dispersion and wrapping of nano lanthanum hydroxide in alginate microspheres.The size of the composite microspheres can be adjusted as needed between 235.5 μm and 748.4 μm, and the mass ratio of alginate to nano lanthanum hydroxide can be adjusted as needed within 1: (0.5-1.5).The composite microspheres of the present application have a phosphorus binding capacity of 41.0 mg / g-90.0 mg / g in a gastric acid environment with pH=2, and excellent phosphorus binding ability, which can be used as an oral phosphorus binding agent for the treatment of hyperphosphatemia, providing a new technical solution for clinical intervention of hyperphosphatemia.

The application discloses a silver-nickel electric contact material added with lanthanum oxide and a preparation method thereof. The method comprises the following steps: calculating the required amounts of lanthanum oxide, nickel powder and Ag element for preparing the contact, weighing the Ag element as silver nitrate and preparing a silver nitrate solution by adding water; first, reacting the lanthanum oxide with the silver nitrate solution, calculating the total amount of sodium hydroxide required for completely reacting the generated lanthanum nitrate and the unreacted silver nitrate with sodium hydroxide to generate lanthanum hydroxide and silver oxide respectively, weighing the sodium hydroxide and preparing a sodium hydroxide solution by adding water; then, reacting the sodium hydroxide solution with the aforementioned suspension to obtain a composite powder of silver oxide and lanthanum hydroxide; washing the composite powder to neutral, drying and roasting to obtain a silver-lanthanum hydroxide composite powder; and mixing the obtained silver-lanthanum hydroxide composite powder with the nickel powder, and then performing the processes of isostatic pressing, sintering and extrusion to obtain the silver-nickel electric contact material. The method can make the lanthanum oxide more uniformly distributed in the silver matrix, and obtain a uniform metallographic structure.

The invention discloses a steel member alloy co-permeation anti-corrosion process, and particularly relates to the technical field of zinc impregnation treatment, and the steel member alloy co-permeation anti-corrosion process comprises the following process steps: step 1, spraying a lanthanum hydroxide-containing ethanol activating solution on the surface of a polished steel member, drying and then charging; step 2, adding an impregnation agent into the zinc impregnation furnace layer by layer, wherein the bottom layer is an aluminum oxide anti-sticking agent, the middle layer is a mixture of zinc powder, aluminum powder, ammonium chloride and nano silicon dioxide, and the covering layer is a mixture of zinc powder and lanthanum hydroxide; and step 3, gradient temperature rise. According to the technology, under the condition of being compatible with an existing production line of a traditional technology, through the four innovative steps of rare earth pre-activation, gradient heating, dynamic zinc supplementing and inert gas cooling, the corrosion-resistant service life of a zinc impregnation layer is doubled, the workpiece deformation rate approaches zero, the cooling efficiency is improved, meanwhile, the cost of an anti-sticking agent and the loss of zinc powder are reduced, the comprehensive production cost is reduced, and the production efficiency is improved. And the industrial-grade precise zinc impregnation standard of zero rework, zero adhesion and zero performance fluctuation is achieved.

The present invention belongs to the technical field of metal materials, and specifically relates to a high-strength ultra-fine tungsten alloy wire and a preparation method thereof. A high-strength ultra-fine tungsten alloy wire, the tungsten alloy wire comprising the following components in weight percentage: 98.5-99.95% tungsten powder, 0.05-1.5% lanthanum hydroxide powder. The present invention provides a high-strength ultra-fine tungsten alloy wire and a preparation method thereof, which obtains a tungsten alloy powder with a uniform distribution of rare earth oxides by efficiently doping a solid (tungsten powder)-solid (lanthanum hydroxide) mixture. The tungsten alloy wire is doped with lanthanum hydroxide instead of lanthanum oxide, because lanthanum oxide easily absorbs water and denatures, resulting in the breakage of the tungsten bar after pressing; then the sintered tungsten alloy billet (20-30 mm) is continuously rolled to 3.0-4.0 mm, and finally, it is drawn to the required specifications by a wire drawing machine, thereby solving the problems of uneven mixing, low strength, high wire breakage rate, low efficiency, and low yield rate of the existing process.

This invention relates to the field of water treatment agents, specifically to a compound defluoridating agent, its preparation method, and its application in industrial wastewater. The defluoridating agent provided by this invention comprises component A and component B. Component A is prepared by mixing polyaluminum ferric chloride, aluminum salt, and magnesium salt; component B comprises a lanthanum-doped biochar-montmorillonite composite material and calcium chloride supported thereon. The lanthanum-doped biochar-montmorillonite composite material is prepared through chitosan-montmorillonite intercalation, lanthanum hydroxide loading, and nitrogen pyrolysis carbonization. In application, the pH of the fluoride-containing industrial wastewater is first adjusted to 5-6, component A is added, and the mixture is stirred and allowed to settle to remove most of the fluoride ions. Then, the pH of the supernatant is adjusted to 8-9, component B is added, and the mixture is stirred and allowed to settle to further remove residual fluoride ions. The defluoridating agent of this invention can achieve a defluoridation rate of over 99% for industrial wastewater, with stable fluoride content in the effluent meeting standards, demonstrating good prospects for industrial application.

The present application relates to the technical field of oxy-lanthanum carbonate, and discloses an oxy-lanthanum carbonate catalyst, a preparation method and application thereof, the oxy-lanthanum carbonate catalyst comprising hexagonal crystal phase oxy-lanthanum carbonate and hexagonal crystal phase oxy-lanthanum carbonate containing doping element R.The method comprises the following steps: (1) adding an alkali solution into a solution of a lanthanum source, and then performing solid-liquid separation and drying to obtain lanthanum hydroxide; (2) contacting a solution containing a compound of doping element R with the lanthanum hydroxide, and then performing drying; (3) performing calcination on the dried product of step (2) in a carbon-containing atmosphere to obtain the oxy-lanthanum carbonate catalyst.The catalyst prepared by the present application has a high carbon dihydrocarbon yield when used in a methane oxidative coupling reaction.

The application discloses a preparation method of a functional lanthanum hydroxide composite PEO-based solid electrolyte for a solid-state battery, and relates to a preparation method of a PEO-based solid electrolyte.The application solves the problems of poor contact with an electrode plate, low ion transmission and unstable interface of an existing PEO electrolyte.The preparation method comprises the following steps: one, preparation of functional group modified La(OH)3-NH2 nanofibers; and two, preparation of a PEO-based composite solid electrolyte.The application is used for the preparation of the functional lanthanum hydroxide composite PEO-based solid electrolyte for the solid-state battery.

The present application relates to the technical field of oxy-lanthanum carbonate, and discloses an oxy-lanthanum carbonate catalyst, a preparation method and application thereof, the oxy-lanthanum carbonate catalyst comprising hexagonal crystal phase oxy-lanthanum carbonate and hexagonal crystal phase oxy-lanthanum carbonate containing a doping element.The method comprises the following steps: (1) adding an alkali solution into a solution of a lanthanum source, then performing aging, solid-liquid separation and drying to obtain lanthanum hydroxide; (2) under a protective atmosphere, contacting a solution of a compound containing a doping element with the lanthanum hydroxide, and then performing drying; (3) performing calcination on the dried product of step (2) under an atmosphere containing CO2 to obtain the oxy-lanthanum carbonate catalyst.The catalyst prepared by the present application has a high carbon dihydrocarbon yield when used in a methane oxidative coupling reaction.

This invention relates to a long-chain alkyl surfactant-mediated lanthanum hydroxide material, its preparation method, and its applications. The lanthanum hydroxide material is synthesized by alkaline co-thermal precipitation of a soluble lanthanum salt and alkyltrimethylammonium bromide in a pressure-resistant reactor under closed conditions. This yields a long-chain alkyl surfactant-mediated lanthanum hydroxide material with optimal adsorption performance, suitable for removing phosphorus nutrients from low-concentration phosphorus wastewater. Compared with existing technologies, the long-chain alkyl surfactant-mediated lanthanum hydroxide material provided by this invention not only possesses good dispersibility but also exhibits higher phosphorus adsorption capacity and rate through the regulation of its physicochemical properties. Compared with lanthanum hydroxide prepared by conventional hydrothermal precipitation methods, its phosphorus separation performance is significantly higher.

The invention provides a crystallization defluorination method for fluorine-containing wastewater in the presence of high-concentration sulfate radicals, and belongs to the technical field of water treatment.The crystallization defluorination method comprises the following steps that before defluorination is conducted on fluorine-containing water containing the high-concentration sulfate radicals, lanthanum fluoride crystal seeds, a composite regulator and a defluorination agent lanthanum hydroxide are added into the water, crystallization reaction conditions are controlled, and the fluorine-containing water containing the high-concentration sulfate radicals is obtained. Enabling fluorine ions and lanthanum hydroxide to form a stable fluorine lanthanum compound crystal through directional crystallization; fluorine lanthanum compound crystals are removed through solid-liquid separation, and deep fluorine removal of the water body is achieved. According to the present invention, with the lanthanum hydroxide crystallization method, by using the extremely low solubility product of the fluorine lanthanum compound, the efficient fixation of the fluorine ions can still be achieved under the interference of the high-concentration sulfate radical, the fluorine concentration of the treated water body is stably reduced to less than 10 mg / L, the secondary pollution is avoided, and the defects of poor selectivity and easy saturation in the high sulfate radical environment of the traditional adsorption method are overcome; the method is suitable for treating high-salt fluorine-containing water bodies such as mining area wastewater and metallurgical fluorine-containing wastewater.

The invention provides a cobalt / lanthanum hydroxide heterojunction loaded porous carbon nanofiber electrocatalyst and a preparation method thereof.The preparation method comprises the steps that 4, 4-diaminodiphenyl ether and pyromellitic dianhydride are added into a solvent and mixed to be uniform, and a polyamide acid precursor spinning solution is prepared; the prepared polyamide acid precursor spinning solution is subjected to electrostatic spinning, and polyamide acid nanofibers are prepared; dipping the prepared polyamide acid nanofiber in a mixed metal salt solution containing cobalt salt, lanthanum salt and zinc salt to prepare a polyamide acid nanofiber precursor loaded with metal ions; the prepared polyamide acid nanofiber precursor loaded with the metal ions is subjected to temperature programming heat treatment in a protective atmosphere, and the cobalt / lanthanum hydroxide heterojunction loaded porous carbon nanofiber electrocatalyst is prepared. The prepared cobalt / lanthanum hydroxide heterojunction loaded porous carbon nanofiber electrocatalyst has excellent bifunctional catalytic activity of electrochemical oxygen reduction reaction and oxygen evolution reaction.

The invention relates to the technical field of pharmaceutical chemicals, in particular to alginate / nano lanthanum hydroxide composite microspheres as well as a preparation method and application thereof. The composite microsphere is prepared by taking sodium alginate as an organic matrix material and nano lanthanum hydroxide as an inorganic filling phase through an electrospray technology, and the nano lanthanum hydroxide can be uniformly dispersed and wrapped in the alginate microsphere; the size of the composite microsphere can be adjusted between 235.5 microns and 748.4 microns as required, and the mass ratio of the alginate to the nano lanthanum hydroxide can be adjusted within 1: (0.5-1.5) as required. The phosphorus binding amount of the composite microspheres still reaches up to 41.0 mg / g-90.0 mg / g in a gastric acid environment with the pH value being 2, the phosphorus binding capacity is excellent, the composite microspheres can serve as an oral phosphorus binding agent to be used for treating hyperphosphatemia, and a novel technical scheme is provided for clinical intervention of the hyperphosphatemia.

A method of immobilizing contaminants disposed in an aqueous medium, the method comprising: contacting the aqueous medium with a particulate crystalline nanocomposite for a sufficient contact time to permit adsorption of the contaminants. The particulate crystalline nanocomposite comprises: a hexagonal lanthanum hydroxide (La(OH)3) crystalline phase; a lanthanum oxide (La2O3) crystalline phase; a monoclinic calcium silicate (CaSiO3) crystalline phase; and, a graphitic carbon nitride (g-C3N4) crystalline phase, wherein at least a fraction of the g-C3N4 is in the form of mesoporous nanosheets.

A lanthanum dioxide carbonate catalyst, a preparation method and a use thereof are provided. The lanthanum dioxide carbonate catalyst comprises hexagonal crystalline lanthanum dioxide carbonate and hexagonal crystalline lanthanum dioxide carbonate containing a doping element R. The method includes the steps of (1) adding an alkali solution to a solution of lanthanum source, and then performing a solid-liquid separation and a drying to obtain lanthanum hydroxide; (2) contacting a solution of a compound containing the doping element R with lanthanum hydroxide, and then performing a drying; (3) calcining the dried product of step (2) under a carbon-containing atmosphere to obtain a lanthanum dioxide carbonate catalyst.

The invention relates to bentonite-lanthanum-based MOF composite phosphorus removal powder, an adsorbent and a preparation method of the bentonite-lanthanum-based MOF composite phosphorus removal powder, and belongs to the technical field of water treatment environment-friendly materials. The composite phosphorus removal powder comprises a bentonite sheet layer serving as a dispersion matrix and a lanthanum-based MOF framework loaded on the surface of the bentonite sheet layer. The adsorbent is prepared by alkali etching of the powder, and has a hierarchical porous structure with both micropores and mesopores and amorphous lanthanum hydroxide nanoclusters. The lanthanum ions are anchored through bentonite interlayer ion exchange and electrostatic adsorption, the composite powder is prepared through in-situ confinement growth, and the problems of nanoparticle aggregation and high cost are effectively solved; further, structural reconstruction is realized through an alkali etching process, mesoporous mass transfer channels are opened, and chemical adsorption sites are activated. The obtained adsorbent has high dispersibility, low cost and excellent adsorption kinetics performance, and shows an excellent deep phosphorus removal effect in low-concentration phosphorus-containing wastewater.

The present application relates to a kind of preparation method of composite flocculant for low turbidity sewage advanced phosphorus removal, belong to water treatment technical field.Preparation operation steps are as follows: (1) in the residual sludge of sewage treatment plant, add alkali, firing, and prepare biochar;(2) prepare modified biochar with acid washing oscillation;(3) constant temperature oscillation in lanthanum chloride solution is prepared to the biochar of fixed lanthanum hydroxide;(4) the biochar of fixed lanthanum hydroxide and polyaluminum chloride flocculant solution are heated and stirred to react, dry, and obtain the composite flocculant of lanthanum hydroxide fixed biochar modification.The composite flocculant is black powder, and specific surface area is 50~200m 2 / g;Pore type structure is mesoporous, and the total pore volume of the pore of p / p° single point adsorption width less than 187.216nm is 0.990:0.216cm³ / g.The composite flocculant of the present application can be suitable for low turbidity water advanced phosphorus removal treatment.The preparation method of the present application is simple in operation and low in cost.

A method of producing hydrogen gas by hydrolyzing sodium borohydride (NaBH4) with water at a temperature of about 20 to 75° C. in the presence of a particulate crystalline nanocomposite catalyst, wherein the ratio by weight of NaBH4 to the particulate crystalline nanocomposite catalyst is from about 1:1 to about 5:1. The particulate crystalline nanocomposite catalyst comprises: a hexagonal lanthanum hydroxide (La(OH)3) crystalline phase; a lanthanum oxide (La2O3) crystalline phase; a monoclinic calcium silicate (CaSiO3) crystalline phase; and, a graphitic carbon nitride (g-C3N4) crystalline phase, wherein at least a fraction of the g-C3N4 is in the form of mesoporous nanosheets.

A La(OH)3 / La2O3 / CaSiO3 / g-C3N4 particulate crystalline nanocomposite including: a hexagonal lanthanum hydroxide (La(OH)3) crystalline phase; a lanthanum oxide (La2O3) crystalline phase; a monoclinic calcium silicate (CaSiO3) crystalline phase; and, a graphitic carbon nitride (g-C3N4) crystalline phase, wherein at least a fraction of the g-C3N4 is in the form of mesoporous nanosheets.

The invention belongs to the technical field of phosphorus adsorption, and particularly relates to a carboxylated magnesium lanthanum hydroxide, a preparation method thereof and an application of the carboxylated magnesium lanthanum hydroxide in an ardealite water washing solution. The preparation method comprises the following steps: mixing magnesium salt and lanthanum salt with a carboxyl compound, carrying out precipitation and coordination complexation reaction, carrying out solid-liquid separation on the obtained reaction liquid, and drying the solid to obtain the carboxylated magnesium lanthanum hydroxide. In the reaction, metal ions (La < 3 + > and Mg < 2 + >) and carboxyl of the carboxyl compound form stable monodentate / bidentate coordination, so that one-dimensional chains are formed, and the chains are further connected in two directions to form a layered structure. Deprotonated carboxyl in the carboxylated magnesium lanthanum hydroxide can form a hydrogen bond with phosphorus and is not combined with SO4 < 2-> and F <->, so that selective adsorption of P is realized; and the hydrogen bond mechanism enables the adsorption rate of phosphorus to be 100 times higher than that of magnesium-lanthanum layered double hydroxide.

The invention discloses a modified aquatic plant planting net and a preparation method thereof, and relates to the technical field of water environment ecological restoration. The modified aquatic plant planting net comprises a planting net body, and the planting net body comprises a base body and a target layer; the matrix is made of inorganic fibers and has a grid structure, and the grid structure forms a plurality of planting areas; the target layer is attached to the surface of the substrate, the substrate is modified by manganese salt and lanthanum salt, and the target layer containing manganese oxide and lanthanum hydroxide is formed on the surface of the substrate; wherein the planting net body can be laid on a water body bottom substrate, the planting area can contain aquatic plants, and root systems of the aquatic plants can stretch out of the grid structure and root on the water body bottom substrate. The problems that a fiber carrier improved by a single lanthanum element is single in function, active ingredients are prone to falling off due to washing or biological attachment in an actual water flow environment, and the long-term stability is poor are solved.