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2133 results about "Hydrotalcite" patented technology

Hydrotalcite is a layered double hydroxide of general formula Mg₆Al₂CO₃(OH)₁₆·4(H₂O), whose name is derived from its resemblance with talc and its high water content. The layers of the structure stack in multiple ways, to produce a 3-layer rhombohedral structure (3R Polytype), or a 2-layer hexagonal structure (2H polytype) formerly known as manasseite. The two polytypes are often intergrown. The carbonate anions that lie between the structural layers are weakly bound, so hydrotalcite has anion exchange capabilities.

Granular filtering material for adsorbing and removing heavy metals in water and preparation method thereof

The invention discloses a granular filtering material for adsorbing and removing heavy metals in water and a preparation method thereof. The granular material consists of the following components in part by mass: 80-120 parts of an adsorbent, 7-14 pats of an additive and 0.5-3 parts of a binding agent, wherein the adsorbent consists of the following components in part by mass: 50-70 parts of coal ash and 30-50 parts of zeolite powder or sea-foam stone powder; the additive consists of the following components in part by mass: 5-7 parts of Mg-Al hydrotalcite, 2-6 parts of biochar and 0.5-1 part of magnesium Lignosulfonate; the binding agent is bentonite. The granular filtering material is prepared through the steps of adsorbent acid modification, biochar preparation, granulation and heat treatment process. According to the invention, the prepared granular filtering material is 3-6 mm in granule size, is large in adsorption capacity and excellent in adsorption effect and can effectively remove heavy metals in water, and no secondary pollutants are dissolved out, so that the granular filtering material can be applied to the treatment on heavy metal micro-polluted water and industrial waste water containing heavy metals, and has good economic and social benefits.
Owner:BEIJING FORESTRY UNIVERSITY

Method for preparing corrosion inhibition anion intercalated layered double hydroxides/oxide composite material and application

The invention provides a corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material, a preparation method thereof and application of the corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material. The preparation method is as follows: corrosion-inhibiting anions are directly inserted between hydrotalcite layers by the one-step coprecipitation method and the roasting restoring method; the nano oxide is generated by means of in situ synchronization during the process of generation of hydrotalcite crystals by controlling the mixture ratio of divalent metal ions to trivalent metal ions, the pH value of a reaction solution and the reaction temperature; and the corrosion-inhibiting anionic intercalated hydrotalcite/nano oxide composite material with the anti-corrosive function is prepared. The invention is mainly characterized in that the in situ preparation method for the hydrotalcite/oxide composite material provided with a nano lamellar structure improves the release amount of a corrosion inhibitor and reduces the water absorption of a coating by leading into the corrosion inhibitor with the anti-corrosive function and the nano oxide which is generated in situ during the reaction process. The composite material can be used to be pigment of an anti-corrosive metallic coating system, and particularly has potential application value in improving the anti-corrosive performance of a magnesium alloy anti-corrosive coating.
Owner:HARBIN ENG UNIV

Nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode and preparation and application thereof

The invention belongs to the technical fields of material sciences and electro-catalytic hydrogen production, and particularly relates to a nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode and preparation thereof, wherein the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode can be used in an electrolytic water oxygen evolution reaction in an alkaline medium. An electrode system takes a nickel-iron hydrotalcite structure as a catalytic activity center and takes nickel foam as an electrode material; in the alkaline medium, the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode can efficiently electrolyze water to prepare oxygen, the overall overcurrent polishing of electrolytic water is reduced greatly, and good stability is showed; according to the preparation technology of the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode, a nickel-iron hydrotalcite composite structure is grownon the nickel foam base through an in-situ electrodeposition method; and the resources of required raw materials are wide, the price is low, the technology is mature and stable, operation is easy, convenient and fast, controllability is high, the process does not produce poison, and the nickel-iron hydrotalcite based electro-catalytic oxygen evolution electrode is suitable for mass production andthe industrial electrolytic water reaction.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Preparation method for photocatalytic material with strong adsorption and high visible light degradation of performance

The invention discloses a gahnitem, zinc oxide and nickel zinc nano-composite photocatalytic material which has a high specific surface area and a mesoporous structure and is prepared by roasting at high temperature by taking ternary hydrotalcite as a precursor. The material is used for the adsorption and the degradation of organic pollutants. The photocatalytic material is prepared by taking zinc nitrate, nickel nitrate, aluminum nitrate, sodium carbonate, sodium hydroxide and the like as raw materials; preparing the raw materials into salt solutions and alkali solutions respectively; mixing the solutions by using a constant-flow pump at the temperature of 80 DEGC with magnetic stirring, transferring the mixed solution into a hydrothermal reaction kettle; performing hydrothermal treatment at 130 to 180 DEG C; performing suction filtration, washing and drying to the precursor; roasting the precursor in Muffle furnace for 2 to 6 hours at the temperature of 400 to 600 DEG C to obtain the product, wherein the specific surface area is greater than 150 m<2>.g<-1>. The photocatalyst disclosed by the invention has regular shape, large specific surface area, and super-high capacity for adsorbing and degrading organics, and can be reused; the raw materials for preparing the composite photocatalyst are abundant, the cost is low, and the process is simple.
Owner:HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY

Fire-extinguishing agent and preparation method thereof

The invention discloses a fire-extinguishing agent. The fire-extinguishing agent is prepared by uniformly mixing hydrophilic solid powder and water or an aqueous solution, adding hydrophobic solid particles and then carrying out mixing and dispersing, wherein the hydrophilic solid powder is one or more of magnesium hydroxide powder, aluminum oxide powder, aluminum hydroxide powder, magnesium carbonate powder, calcium carbonate powder, calcium hydroxide powder, zinc borate powder, montmorillonoid powder, hydrotalcite powder, hydrotalcite like compound powder, fly ash powder, diatomite powder, mica powder and attapulgite powder. The fire-extinguishing agent disclosed by the invention can exert stifling, cooling, separating and chemically restraining functions at the same time, and has the advantages of no toxicity, small environment pollution, high fire extinguishing efficiency and the like. According to the fire-extinguishing agent disclosed by the invention, the hydrophilic solid powder with a certain fire extinguishing performance and smaller solubility in water is added into a water phase so as to reduce the using amount of water-soluble substances, thus the cost of the fire-extinguishing agent is reduced when higher fire-extinguishing efficiency is kept, and the fire-extinguishing agent is easier to clean after being used for extinguishing fire.
Owner:XIAN UNIV OF SCI & TECH

Supported bimetal nanocrystal catalyst and preparation method thereof

The invention provides a supported bimetal nanocrystal catalyst which is a binary bimetal catalyst taking aluminum oxide as a supporter and is abbreviated to P-M/MgO-AlO3, wherein P represents noble metal such as Pd, Au, Pt, Ag and the like, and M represents one or two of metal cations such as Cu<2+>, Zn<2+>, Ni<2+>, Ga<3+> and Fe<3+>. The particle size of the P-M bimetal nanocrystal is 2-10 nm, the dimension distribution is narrow, the nanocrystal particles are highly dispersed on the surface of the supporter uniformly and stably, and the crystal form is complete. The preparation method of the catalyst comprises the following steps: preparing soluble Mg<2+> salt for MgMAl-LDH (layered double hydroxide) preparation and an endogenous active metal salt solution into a mixed solution; then simultaneously adding precipitant and the aluminum oxide supporter into the reaction system; enabling hydrotalcite to grow on the surface of the aluminum oxide supporter through an in-situ growth method; supporting exogenous active metal through a wet impregnation method; and performing high-temperature reduction on the obtained catalyst precursor under a reducing atmosphere, thus obtaining the supported bimetal nanocrystal catalyst which is stably and highly dispersed.
Owner:BEIJING UNIV OF CHEM TECH

Fully-degradable heat-insulation mulch and preparation method thereof

InactiveCN103087482AImprove thermal insulation functionalityFull intercalation reactionPlant protective coveringsSocial benefitsPlasticizer
The invention relates to fully-degradable heat-insulation mulch and a preparation method thereof. The fully-degradable heat-insulation mulch comprises the following components in parts by mass: 30-60 parts of PBAT (poly(butylene adipate terephthalate), 10-30 parts of polylactic acid, 10-30 parts of starch, 5-10 parts of plasticizer, 0-2 parts of chain extender, 5-10 parts of fillings, 5-20 parts of fully-degradable hydrotalcite master batch and 0-5 parts of fully-degradable color master batch. The preparation method of the fully-degradable heat-insulation mulch comprises the following steps of: carrying out extruding pelletizing on hydrotalcite powder and the PBAT in double screws to obtain the hydrotalcite master batch, preparing a material for the fully-degradable heat-insulation mulch from the hydrotalcite master batch, the PBAT, the starch, the polylactic acid, the plasticizer, the chain extender and the fillings according to a specific production process, and finally carrying out secondary processing on the obtained material in coordination with the fully-degradable color master batch to obtain the fully-degradable heat-insulation mulch. The fully-degradable heat-insulation mulch disclosed by the invention has the capability of completely degrading in soil and is good in heat insulation property, low in production cost, favorable in economic and social benefits and worthy of popularization and application.
Owner:WUHAN HUALI BIOLOGY CO LTD

Three-dimensional multi-level structure type high-dispersion nickel-based electro-catalytic material and preparation method thereof

ActiveCN108554413AAffects catalytic performanceUnique structural featuresCatalyst activation/preparationElectrolytic organic productionLevel structureIon exchange
The invention provides a three-dimensional multi-level structure type high-dispersion nickel-based electro-catalytic material and a preparation method thereof. The method takes foam nickel as a conducting matrix and a nickel source needed by reaction is provided; urea is used as a precipitating agent, ammonium fluoride is used as an etching agent and an NiAl-LDH//NF precursor grows on the surfaceof a foam nickel framework structure in situ; negative ions including H2PO4<-> and B(OH)4<-> are introduced into hydrotalcite layers through an ion exchanging method; a hydrotalcite intermediate containing the negative ions is reduced at high temperature to obtain the three-dimensional multi-level structure type high-dispersion nickel-based electro-catalytic material; a chemical formula is NiY-Al2O3/NF, wherein Y is one of P or B. The material is used for electro-catalytic oxygen evolution reaction under an alkaline condition; when the current density reaches 10mA.cm<-2>, the overpotential ofthe oxygen evolution reaction is 270 to 190mV. When the material is used for carrying out selective electro-catalytic oxidization reaction on 5-hydroxymethylfurfural under the alkaline condition, theconversion rate and the selectively reach 92 to 100 percent and 95 to 100 percent respectively, and the invention proves that the material is suitable for being used as the electro-catalytic material.
Owner:BEIJING UNIV OF CHEM TECH

High-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, method for synthesizing high-performance ultrathin nitride electro-catalyst and application thereof

The invention discloses a high-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, a method for synthesizing the high-performance ultrathin nitrite electro-catalyst and application thereof. A chemical formula of the high-performance ultrathin nitride electro-catalyst is (Fe<X>Ni<1-X>)<4>N, and the x is larger than 0 and is smaller than 1. The nitrite electro-catalyst is of an ultrathin nanometer plate structure, the size of the nitrite electro-catalyst is 50-100nm, and the thickness of the nitrite electro-catalyst is 1.5-3nm. The method includes synthesizing NiFe hydrotalcite precursors at first; nitriding the NiFe hydrotalcite precursors at high temperatures under the protection of ammonia gas to obtain end products. The high-performance ultrathin nitride electro-catalyst, the method and the application have the advantages that series of nitrite have large specific surface areas, are good in electron conductance and are excellent in performance during electro-catalytic water total-decomposition reaction, limiting currents are higher than limiting currents of Pt/C during electro-catalytic hydrogen evolution reaction (HER), and the performance of the nitride in various aspects are superior to the performance of corresponding oxide NiFe-MMO during oxygen evolution reaction (OER); the electro-catalyst is low in cost, easy and convenient to operate, simple in process and excellent in catalytic performance, and fundamental application research on materials in the field of electro-catalysis can be provided.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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