Provided is a method of preparing a sparsely pillared organic-inorganic hybrid compound. The method of preparing an organic-inorganic hybrid compound includes: preparing a compound having a gibbsite structure by a method other than a hydrothermal synthesis method, using a trivalent metal cation source, an alkali imparting agent, and a first solvent (S10); and preparing an organic-inorganic hybrid compound by a method other than a hydrothermal synthesis method, using the compound of the gibbsite structure, a divalent metal cation source, dicarboxylic acid, and a second solvent (S20).

A method of selectively extracting lithium from a lithium sulfate aqueous solution, the method comprising: (i) mixing an aluminum-containing sorbent material into the lithium sulfate aqueous solution to form a precursor mixture, wherein the aluminum-containing sorbent material is an aluminum hydroxide, aluminum oxide, or combination thereof; and (ii) heating the precursor mixture to a temperature of 50-200° C. to result in selective formation of a solid lithium-aluminum complex and mother liquor; and wherein the method may further comprise: (iii) recovering isolated lithium salt from the solid lithium-aluminum complex by heating the solid lithium-aluminum complex in water or aqueous solution at a temperature of 50-100° C. to result in delithiation of the solid lithium-aluminum complex with transfer of the lithium salt from the solid lithium-aluminum complex to the water or aqueous solution, along with production of aluminum hydroxide solid.

The invention is related to a layered double hydroxide electride which can be produced without high-temperature treatment, and a production method of which cost can be reduced. The layered double hydroxide electride contains electrons between layers and has an electron density of 2.0×10.sup.18 cm.sup.−3 or more. The method of producing the layered double hydroxide electride includes a step of mixing a starting layered double hydroxide with an electron exchanger for exchanging anions existing between layers of the starting layered double hydroxide for electrons to produce the layered double hydroxide electride.

Surface-modified layered double hydroxides (LDHs) are disclosed, as well as processes by which they are made, and uses of the LDHs in composite materials. The surface-modified LDHs of the invention are more organophilic than their unmodified analogues, which allows the LDHs to be incorporated in a wide variety of materials, wherein the interesting functionality of LDHs may be exploited.

A lactic acid adsorbent includes at least one of a layered double hydroxide that contains multiple metal hydroxide layers and also contains anions and water molecules held between the metal hydroxide layers, or a layered double oxide that is an oxide of a layered double hydroxide. The metal hydroxide layers contain divalent metal ions M.sup.2+ and trivalent metal ions M.sup.3+, mole ratio (M.sup.2+/M.sup.3+) of the divalent metal ions M.sup.2+ to the trivalent metal ions M.sup.3+ in a layered double hydroxide is 1.9 to 3.6, and the mole ratio in a layered double oxide is 1.8 to 3.6.

Processes for making surface-modified layered double hydroxides (LDHs) are disclosed, as well as surface-modified LDHs, and their uses in composite materials. The surface-modified LDHs of the invention are more hydrophobic than their unmodified analogues, which allows the surface-modified LDHs to be incorporated in a wide variety of materials, wherein the interesting functionality of LDHs may be exploited.

Processes for making magnesium-containing layered double hydroxides from a magnesium phosphate-containing mineral are disclosed, as well as a magnesium-containing layered double hydroxides and their uses.

Described is a method for extracting lithium from salt lake brine and simultaneously preparing aluminum hydroxide. This method includes a. adding an aluminum salt to the brine, adding an alkali solution, then subjecting to crystallization reaction and solid-liquid separation to obtain lithium-containing brine; b. evaporating and concentrating the lithium-containing brine, adding an aluminum salt, adding an alkali solution dropwise to perform a co-precipitation reaction and solid-liquid separation to obtain a lithium-containing layered material filter cake, wherein in steps a and b, the alkali solution is an alkali solution free of carbonate ion; c. dispersing the lithium-containing layered material filter cake in deionized water to form a suspension slurry, then adjusting the pH value of the suspension slurry so as to carry out a lithium deintercalation reaction; d. filtering to obtain aluminum hydroxide filter cake; e. washing the aluminum hydroxide filter cake with deionized water and drying.

The invention provides a nitrogenous gas sustained releasing agent that is capable of sustainably releasing off nitrogenous gases in the air at normal temperature and safe to handle and a nitrogenous gas sustained releaser composed of the same as well as a nitrogenous gas sustained releasing method, respiratory equipment, a package and a nitrogenous gas sustained releasing apparatus using said sustained releaser. The nitrogenous gas sustained releasing agent contains a layered double hydroxide having nitrite ions (NO.sub.2.sup.−) and/or nitrate ions (NO.sub.3.sup.−) included between layers. The nitrogenous gas sustained releaser composed of the sustained releasing agent is exposed to a gas containing carbon dioxide and water vapor to induce any one or more processes of sustained release of nitrous acid, self-decomposition of nitrous acid, oxidization/reduction of nitrous acid, and reduction of nitrite ions/nitrate ions thereby sustainably releasing off nitrogenous gases.

A hybrid functionalized lamellar comprises a layered double hydroxide and [Sn.sub.2S.sub.6].sup.4− anions intercalated with the gallery of the layered double hydroxide to form a [Sn.sub.2S.sub.6].sup.4− intercalated layered double hydroxide.