30results about "Hydrotalcite" patented technology

The invention discloses a magnesium-aluminum hydrotalcite / carbon nanotube composite material and a preparation method and application thereof, and the preparation method of the magnesium-aluminum hydrotalcite / carbon nanotube composite material comprises the following steps: S1, carrying out acid pretreatment on a carbon nanotube; and S2, preparing the magnesium-aluminum hydrotalcite / carbon nanotube composite material. Compared with the prior art, the preparation method of the magnesium-aluminum hydrotalcite / carbon nanotube composite material has the advantages that Mg (NO3) 2.6 H2O, Al (NO3) 3.9 H2O, CO (NH2) 2 and pretreated carbon nanotubes are adopted, and magnesium-aluminum hydrotalcite grows on the carbon nanotubes through a hydrothermal homogeneous precipitation method; through the synergistic effect of the carbon nanotubes and the magnesium-aluminum hydrotalcite, aggregation among nanoparticles is effectively prevented, the growth size of the particles is limited, and the magnesium-aluminum hydrotalcite / carbon nanotube composite material is good in crystallinity, small in particle size, high in specific surface area and high in adsorption performance. In a radioactive uranium element adsorption experiment, the adsorption efficiency is as high as 95.6%, and the adsorption capacity is as high as 17.32 mg / g.

The application discloses a hydrotalcite nanocomposite, a preparation method and application thereof. The composite material comprises hydrotalcite nanosheets and metal nanoclusters uniformly distributed on the hydrotalcite nanosheets; the metal nanoclusters are selected from any two of palladium nanoclusters, rhodium nanoclusters and ruthenium nanoclusters; the metal cations in the hydrotalcite nanosheets are divalent metal ions and trivalent metal ions; the divalent metal ions are selected from one or more of Cu 2+ , Mg 2+ and Ni 2+ ; the trivalent metal ions are selected from Al 3+ and / or Fe 3+ . The hydrotalcite nanocomposite has good catalase-like and glucose oxidase-like activities, can effectively relieve hypoxic microenvironment and consume glucose in tumor cells, further induce bisulfide death, and due to the two-dimensional confinement effect of the hydrotalcite nanosheets, can effectively increase the singlet oxygen production efficiency of noble metals, and realize tumor treatment of drugs.

The application discloses a hydrotalcite nanocomposite, a preparation method and application thereof. The composite comprises a high-entropy hydrotalcite nanosheet matrix and platinum nanoclusters loaded on the matrix; and cations in the layer plate of the high-entropy hydrotalcite nanosheet matrix comprise cations of Cu, Mn, Co, Ni and Fe. A nanomedicine for treating tumors prepared by using the hydrotalcite nanocomposite has excellent catalytic ROS generation capacity.

The invention provides a hydrotalcite-based two-dimensional material and a preparation method thereof, and the preparation method comprises the following steps: S1, carrying out heat treatment on hydrotalcite at 300-600 DEG C to obtain a metal oxide; s2, dispersing a metal oxide in water to form a turbid liquid; and carrying out ultrasonic treatment on the turbid liquid in an ice bath until the turbid liquid becomes gel, and then drying to obtain the hydrotalcite-based two-dimensional material. According to the method, few-layer and single-layer two-dimensional materials can be obtained through a simple and mild preparation process.

The present invention provides a method for producing layered double hydroxides with high water permeability. [Solution] The method for producing layered double hydroxide includes a production step of mixing an acidic solution and an alkaline solution to produce a slurry-like layered double hydroxide, and a filtration step of filtering the slurry-like layered double hydroxide, wherein the temperature of the layered double hydroxide in the production step is maintained at 30°C or lower and within a temperature range where it does not freeze.

The invention provides a quenching crystallization reaction system for preparing layered composite metal hydroxides and a corresponding preparation method, a high-pressure cooling distributor is additionally arranged between a reaction kettle and a collecting tank, and the high-pressure cooling distributor comprises a cavity and a quenching device which are communicated with each other; and a low-temperature cooling medium enters the cavity from the quenching device, is in direct contact with the high-temperature reaction slurry and rapidly cools the high-temperature reaction slurry, so that the layered composite metal hydroxide with the surface defect active site can be obtained. According to the invention, a cooling liquid system consistent with hydrotalcite reaction slurry is adopted, construction of defect active sites is realized for hydrotalcite through a quenching type cooling mode under the condition of not introducing impurities, the product performance can be effectively improved, the equipment requirement is low, the process is simple, the cost is effectively reduced, and the method is suitable for industrial production. And meanwhile, the impurity ion introduction problem caused by acid-base solvent etching and the like is also avoided, the process cleanliness is guaranteed, and the method is very suitable for industrial implementation.

The invention relates to the technical field of treatment of heavy metal ions in soil, and discloses a preparation method and application of a flower-like soil heavy metal ultra-stable mineralizer. A coprecipitation method is adopted, an alkali source is provided for a system through amino alcohol, a metal precursor preferentially grows in the specific direction in the reaction process, and then nanosheets are driven to be spontaneously assembled into a three-dimensional flower-shaped structure. Meanwhile, the amino alcohol can expand interlayer channels and enhance the anion exchange capacity of the material. The finally obtained hydrotalcite with the three-dimensional flower-shaped structure can efficiently adsorb and fix heavy metal ions in soil.

The invention relates to the technical field of fine chemical engineering, in particular to a method for recycling hydrotalcite production wastewater. The method comprises the following steps: carrying out filtration and synthetic reaction conversion on wastewater generated in hydrotalcite production, and carrying out heating reaction, filtration and drying to obtain the finished product hydrotalcite. According to the method provided by the invention, the wastewater generated in the hydrotalcite production process can be converted into the finished product hydrotalcite again, the reduction rate of OH <-> in the wastewater reaches 90% or above, the reduction rate of CO3 < 2-> reaches 82% or above, and material waste and environmental pollution are reduced; the method provided by the invention is low in production wastewater treatment cost and convenient to operate.

The present invention provides a double metal layered hydroxide represented by the formula [M(II) 1‑x M(III) x (OH)2] x+ (A n‑ ) x / n ·mH2O, wherein M(II) contains a divalent cation selected from at least one of Mg, Zn, Ca, Ni, Co, Cu, Fe, Mn, and Sr, M(III) contains a trivalent cation selected from at least one of Al, Fe, Cr, Co, In, Ga, and V, A n‑ contains an anion selected from at least one of CO3 2‑ , OH ‑ , F ‑ , Cl ‑ , SO4 2‑ , NO3 ‑ , PO4 3‑ , B(OH) ‑ , VO4 3‑ , MnO4 ‑ , ClO4 ‑ , a carboxylate, a sulfonate, a sulfinic acid, and a thiocarboxylate, x is 0 < x < 1, n is the valence of A, and m is a number of 0 or more, and the double metal layered hydroxide has an average particle diameter D50 of 0.3 to 1.0 μm, a BET specific surface area of 8 to 25 m 2 / g, and a crystallite size of a D003 plane of 340 to 400 angstroms.

The application discloses a method for preparing ultrathin layered composite metal hydroxide by using an atom economy reaction. The method uses divalent and trivalent metal hydroxide and an amide compound as raw materials, and through ultrasonic-assisted strengthening separation, ultrathin LDHs nanosheets with a c-axis direction size of only 2-3 nm are synthesized in one step. The amide compound raw material is hydrolyzed to generate formate, acetate and the like into the interlayer of the LDHs under a hydrothermal environment, the carboxyl group of the amide compound raw material is attached to the surface of the LDHs nanosheet, hydrogen bonds are formed between the carboxyl group and the hydroxyl group on the surface of the nanosheet, the hydrogen bonds between the hydroxyl group and the interlayer water molecules are prevented from being formed, the electrostatic attraction between the LDHs layers is reduced, the mutual accumulation between the layers is weakened, and the separation of the LDHs layers is further promoted under the high-frequency oscillation of the ultrasonic wave, the thickness of the layer accumulation is significantly reduced, and the ammonia water generated in the reaction can be recycled and reused, and the product can be obtained without washing.

This invention belongs to the field of flame retardant technology, specifically relating to a red mud-based nano-flame retardant, its preparation method, and its application. The invention involves mixing red mud with a carbon-containing reducing agent and subjecting it to reduction roasting. Iron oxides in the red mud are reduced to metallic iron. Then, the metallic iron is dissociated through crushing and grinding. Magnetic separation is then used to separate the magnetic product (metallic iron) and the non-magnetic product (aluminum-rich slag, mainly containing alumina). The aluminum-rich slag, magnesium additives, and water undergo a mechanochemical reaction in a CO2 atmosphere. Under mechanochemical action, the alumina in the aluminum-rich slag and the magnesium in the magnesium additives react with water and carbon dioxide to form magnesium aluminum carbonate-type hydrotalcite, resulting in a red mud-based nano-flame retardant containing hydrotalcite components.

Provided is an aluminum material provided with a corrosion-resistant film by steam treatment, which can exhibit excellent corrosion resistance. **Solution**: It relates to an aluminum material comprising a base material made of aluminum or an aluminum alloy and a corrosion-resistant film formed on at least a part of the base material. The corrosion-resistant film contains at least one kind of aluminum hydroxide oxide and an Al-based layered double hydroxide (Al-based LDH) represented below. And the Al-based LDH essentially contains an Al-based LDH whose anion component is nitrate ion. Also, in the present invention, the Al-based LDH is preferentially oriented on the (003) plane. TIFF2026049968000006.tif11149 M1 is a divalent metal element and is any one of Co, Zn, Mg, Cu, Mn, Fe, Ni, Cr, Cd, Ca, and M1 2+ is a divalent metal ion. The anion component A n- is OH - , CO3 2- , NO3 - , SO4 2- , F - , Cl - is at least any one of them.

A composite material, wherein the composite material contains aluminum alloys with at least one of alkaline-earth metals and transition metals, and are used for removing pollutants by dissolving to release divalent metal ions, trivalent aluminum ions and hydroxide ions, which contact with other divalent and trivalent metal cations and anions in the contaminated water, to perform an in situ self-assemble of two-dimensional Layered Double Hydroxides (LDH) precipitates; consists of 18-70 weight % of aluminum metal, 30-80% weight of a second type of metal, and 0-2 weight % of an auxiliary agent; has a particle size of 0.01-3 mm; and preferably forms a micro-nano Alloy@LDH composite material with a core-shell structure by pretreating with dilute HCl. The present invention is used for soil remediation or sewage purification, and is suitable for chemical removal and degradation of complex contaminants from an acidic to alkaline environment.

The invention provides a synthetic method of a hydrotalcite-like compound and the hydrotalcite-like compound, and relates to the technical field of layered mineral materials, and the synthetic method comprises the following steps: dropwise adding a metal salt solution into a mixed solution of an ammonia water-ammonium chloride buffer pair and a target anion salt to obtain a reaction mixed solution, and heating the reaction mixed solution to 100-180 DEG C, and aging for 8-48 hours to obtain the hydrotalcite-like compound. Metal ions in the metal salt solution comprise divalent metal ions and trivalent metal ions, and in the reaction mixed solution, the concentration of the divalent metal ions is 0.01-0.12 mol / L, and the concentration of the trivalent metal ions is 0.001-0.05 mol / L; in the mixed solution, the concentration of the target anions is 0.012 to 10 mol / L. The method comprises the following steps: directly dropwise adding a metal salt solution into a mixed solution of an ammonia water-ammonium chloride buffer pair and a target anion salt to obtain a reaction mixed solution, aging the reaction mixed solution at 100-180 DEG C for 8-48 hours, and controlling the concentration of target anions, the concentration of metal ions and aging conditions to obtain LDHs crystal grains with uniform particle size and larger size.

The present invention provides hydrotalcite that does not cause thickening of the resin or a decrease in its mechanical properties, and that exhibits excellent anion scavenging performance in the resin. [Solution] Hydrotalcite containing magnesium and aluminum, wherein the hydrotalcite is particulate and the primary particles have a plate-like shape. The primary particles have an average plate diameter with a major axis of 400-700 nm and an aspect ratio (average plate diameter major axis / average plate diameter minor axis) of 1.4-2.0. Hydrotalcite for electronic materials characterized by the following features.

The application relates to the technical field of lithium extraction and resource utilization, and particularly discloses a method for preparing lithium carbonate by purifying a lithium-containing solution through an adsorption-pressurized desorption method, which comprises the following steps: step (1), preparing a granular lithium adsorbent, comprising the following steps: step a, mixing LiCl, AlCl3.6H2O, urea, deionized water, sodium oleyloxyethanesulfonate to obtain a liquid adsorbent, then performing suction filtration to remove the filtrate, and preparing a powder adsorbent; step b, mixing the powder adsorbent, DMF and ethylene-vinyl acetate copolymer, then adding water, and aging to prepare the granular lithium adsorbent; step (2), passing the lithium-containing solution into the granular lithium adsorbent, then performing pressurized desorption through flushing with a desorbent after adsorption saturation, and obtaining a lithium-rich desorption solution; and step (3), performing heating decomposition on the lithium-rich desorption solution, then performing crystallization, and obtaining lithium carbonate. The lithium extraction method has the advantages of large lithium extraction capacity, good effect and low cost.

The invention provides hydrotalcite that can inhibit foaming and can exhibit excellent heat stability when added to resins such as chlorine-containing resins, while also inhibiting resin coloration, without the combined use of additives with the resins. The hydrotalcite of the invention is represented by formula (1) and has a specific surface area of 120 m2 / g to 250 m2 / g as determined by the BET method.         M2+xZny·M3+zOx+y+(3 / 2)z     (1) (In the formula, M2+ represents at least one divalent metal ion, M3+ represents at least one trivalent metal ion, and x, y and z represent numbers satisfying 0 < x ≤ 0.5, 0 < y ≤ 0.2 and 0 < z <_ 0.4.)

The application provides a naphthalene carboxylic acid and / or derivative acid intercalated layered double hydroxide and a preparation method thereof. The preparation method comprises: reacting a mixed system containing naphthalene carboxylic acid and / or derivative, or alkali metal salt of naphthalene carboxylic acid and / or derivative, divalent metal chloride, trivalent metal chloride and alkali to obtain the naphthalene carboxylic acid and / or derivative acid intercalated layered double hydroxide. The preparation method of the application uses magnesium chloride and aluminum chloride as metal ion sources, naphthalene carboxylic acid and / or derivative or salt thereof as anion source, and sodium hydroxide or potassium hydroxide as alkali source to prepare the LDHs, solves the problems of low flame retardant efficiency, poor ultraviolet resistance of common layered double hydroxide fillers and the problem that common layered double hydroxide fillers cannot have both flame retardant and ultraviolet resistance, and can simultaneously improve the flame retardant property and ultraviolet absorption property of the layered double hydroxide.

This invention discloses a method for synthesizing magnesium aluminum hydrotalcite, comprising the following steps: (1) mixing magnesium oxide, magnesium bicarbonate, aluminum hydroxide, and sodium hydroxide, then adding an ethanol aqueous solution for wetting and grinding; (2) gradually increasing the temperature while grinding, and then maintaining the temperature for reaction; (3) after the reaction is completed, restoring to room temperature, filtering, washing with water, and drying to obtain magnesium aluminum hydrotalcite. The magnesium aluminum hydrotalcite obtained by this invention has high crystallinity, small particle size and good particle size dispersion, high purity, no impurities, and high yield.

The present invention provides a novel method for producing an ion-exchanged hydrotalcite, the method including no complicated steps, needing no massive equipment, and enabling a hydrotalcite to be ion-exchanged while inhibiting the formation of a by-product, etc. This method for producing an ion-exchanged hydrotalcite (3) is characterized by comprising a first step, in which a powdery or pasty hydrotalcite (1) is mixed and reacted with an aqueous solution of an acid (2) so that the resultant mixture has a water content in the range of 10-60 mass %, and a second step, in which a reaction product obtained in the first step is dried and pulverized without via a cleaning step.

The application discloses a kind of sustained-release medicinal enteric material and preparation method thereof, and relates to the field of enteric material.In the preparation of sustained-release medicinal enteric material, talcum powder, tannic acid and iron chloride hexahydrate are mixed and reacted to obtain modified talcum powder;Emulsifier, molecular weight regulator, pH buffer, comonomer and initiator are mixed and reacted to obtain modified polyacrylic acid resin;Modified polyacrylic acid resin, modified talcum powder, polyvinylpyrrolidone and anhydrous ethanol are mixed to obtain sustained-release medicinal enteric material.The sustained-release medicinal enteric material prepared by the application has excellent enteric solubility, sustained-release property and anti-inflammatory property.

The invention relates to the technical field of two-dimensional sheet turbid liquid preparation, and discloses a two-dimensional sheet turbid liquid, a preparation method and application, the preparation method comprises the steps of raw material preparation, mixing dissolution, standing stripping and stable molding, and the raw materials comprise a two-dimensional sheet composition raw material, a hydrogen peroxide aqueous solution, a catalyst, a stabilizer, a functional additive and water; the hydrogen peroxide aqueous solution contains less than or equal to 8% by weight of hydrogen peroxide; the catalyst and the stabilizer have a synergistic effect, efficient interlayer stripping of the two-dimensional sheet-shaped composition raw materials is achieved under the mild condition, and the safety risk and supervision limitation of high-concentration hydrogen peroxide are avoided. The preparation method is safe, controllable, low in energy consumption and free of toxic waste liquid and waste gas, ton-level amplification production can be achieved, and the prepared turbid liquid is high in stability and can be directly applied to the fields of high-temperature protection, fire extinguishment, chemical catalysis, adsorption filtration and the like or applied to the fields of high-temperature protection or simple post-treatment.

The invention relates to the field of metal hydroxide material synthesis, in particular to a system for automatically synthesizing binary and ternary layered double hydroxides, which comprises a control module, a signal receiving module, a solution mixing module, an automatic pump module, an automatic valve module, a reaction module and a power supply, the control module is configured to send a synthesis instruction to the signal receiving module; the signal receiving module is configured to receive and process the instruction and send control signals to the automatic pump module, the automatic valve module, the solution mixing module and the reaction module; the automatic valve module is provided with a middle interface and a plurality of peripheral interfaces, the middle interface is connected with the automatic pump module, and the peripheral interfaces can be connected to a solution source, a solution mixing module or a reaction module; the automatic pump module is configured to draw or discharge liquid under the control signal. According to the invention, the automatic preparation of the hydrotalcite material can be realized, the manpower is saved, the synthesis stability and repeatability are improved, the risk of toxic substances is reduced, and the development of the hydrotalcite research field is promoted.

This hydrotalcite compound is represented by formula (I): [M12+ 1-xM23+ x(OH)2][(A1n-)x / n·mH2O] ··· (I) [In formula (I), M12+ denotes one or more divalent metal ions, M23+ denotes one or more trivalent metal ions, A1n- denotes one or more anions having a valency of n, said one or more anions having a valency of n includes at least an anionic organic dye having absorption at a wavelength of 450 nm or more, the value of m is not less than 0 but less than 1, the value of n is 1-5, and the value of x is more than 0 but less than 0.5.]　The anion further includes a carbonate ion and a nitrate ion. The hydrotalcite compound is surface treated with a higher fatty acid.

The present application relates to the technical field of catalytic material preparation, and particularly relates to a preparation method of cobalt-aluminum hydrotalcite nanosheet, and proposes a preparation method of cobalt-aluminum hydrotalcite nanosheet, which comprises the following steps: S10, mixing a solution containing a cobalt salt and an aluminum salt with a precipitator to obtain a first mixed solution; S20, separating and collecting the solid of the first mixed solution, washing and drying to obtain blocky cobalt-aluminum hydrotalcite; S30, dispersing the blocky cobalt-aluminum hydrotalcite in distilled water, mixing with a lye to obtain a second mixed solution; S40, performing hydrothermal reaction on the second mixed solution, then separating and collecting the solid, washing and drying to obtain the cobalt-aluminum hydrotalcite nanosheet. In the technical scheme, the cobalt salt and the aluminum salt are selected as the metal source for preparing the hydrotalcite, the hydrotalcite is prepared by using the coprecipitation method, and then the prepared hydrotalcite is subjected to hydrothermal treatment in the lye to obtain the hydrotalcite nanosheet. The prepared hydrotalcite nanosheet has a large specific surface area and a regular structure, and the preparation process is simple and easy to operate.

The present invention provides a composite metal oxide that has exceptional anion adsorptivity and is capable of removing multiple types of anions, each at a high adsorption rate.　The present disclosure is a composite metal oxide represented by formula (1). The composite metal oxide has a solid base amount of 3.70 mmol / g.　Formula (1): (Mg1−xAlx)O1+x / 2 [In formula (1), x is a number that satisfies 0.18≤x≤0.45.]

The invention provides modified calcium-aluminum hydrotalcite as well as a preparation method and application thereof, and belongs to the technical field of adsorption materials. According to the invention, industrial waste is used as a main raw material, a hydrothermal method is adopted, and parameters of a hydrothermal reaction are limited, so that the raw material can be fully dissolved and dispersed, and calcium ions, aluminum ions and sulfate ions are synthesized into sulfate intercalated calcium-aluminum hydrotalcite under an alkaline condition; solid impurities which do not participate in the reaction serve as inclusions and are fixed in crystal lattices of the calcium-aluminum hydrotalcite, so that coverage on active sites is avoided; solid impurities fixed in crystal lattices can also be used as carriers of active sites, so that more active sites are exposed, and the adsorption capacity is further improved; calcium-aluminum hydrotalcite is roasted, the structure is reconstructed, rich mesopores and micropores are formed, more active sites are provided for adsorption, and the phosphorus adsorption amount is increased.

The application provides a hydrotalcite and a preparation method thereof. The hydrotalcite is prepared by a method combining low-temperature water bath and high-temperature hydrothermal reaction, and a regulator is introduced in the hydrothermal reaction to adjust the interlayer spacing of the hydrotalcite and improve the acid absorption capacity of the hydrotalcite. The obtained hydrotalcite is used as a thermal stabilizer of PVC general plastic, and can significantly improve the thermal stability of the plastic. The application also relates to the manufacturing of PVC plastic.

The present application relates to a method for preparing a full inorganic CsPbBr3 / layered double hydroxide (CsPbBr3 / LDH) superlattice. However, at present, the perovskite quantum well material is mainly based on the organic-inorganic hybrid system of long-chain organic amine ions, and the structural stability is poor. Therefore, it is of great significance to develop full inorganic two-dimensional perovskite superlattice with inorganic quantum barrier for artificial lighting application. Here, we design an ion exchange strategy to prepare a full inorganic CsPbBr3 / layered double hydroxide (CsPbBr3 / LDH) superlattice. The prepared CsPbBr3 / LDH superlattice emits blue light, and the FWHM and PLQY are 20 nm and 55%, respectively. The research results provide a general strategy for preparing full inorganic superlattice, and provide a platform for synthesizing ordered and designable perovskite superlattice.

The invention provides a preparation method of hydrotalcite-like nanosheets, and relates to the technical field of layered mineral materials.The preparation method comprises the steps that carbonate type magnesium-aluminum hydrotalcite-like master batch and a polypeptide solution with the first concentration are mixed, and a pre-product is obtained after a heating reaction; and putting the pre-product into a polypeptide solution with a second concentration, and obtaining the hydrotalcite-like nanosheet under the action of a high-energy ultrasonic probe, wherein the polypeptide solution with the first concentration is a saturated solution, and the first concentration is greater than the second concentration. According to the invention, a saturated polypeptide solution is used, a heating reaction is used for assisting a high-energy ultrasonic probe to directly realize delamination of the micron-sized carbonate type magnesium-aluminum hydrotalcite, and the whole preparation process avoids using an organic solvent, strong acid, strong alkali and the like, avoids high-temperature calcination, accords with the concepts of low carbon, energy conservation, environmental protection and the like, and is suitable for industrial production. And the magnesium-aluminum hydrotalcite nanosheet with a high length-diameter ratio can also be obtained.