A method of removing hydrogen sulfide from a subterranean geological formation includes injecting a drilling fluid suspension in the subterranean geological formation. The drilling fluid suspension has a pH of 10 or more and includes a layered triple hydroxide material, including manganese, copper, and aluminum, in an amount of 0.01 to 1.5 percent by weight of the drilling fluid suspension. The method further includes circulating the drilling fluid suspension in the subterranean geological formation and forming a water-based mud and scavenging the hydrogen sulfide from the subterranean geological formation by reacting the hydrogen sulfide with the layered triple hydroxide material in the water-based mud.

Exemplary layered double hydroxides (LDHs) may comprise a compound of formula Mg.sub.4-yAlX.sub.y(OH).sub.2, wherein X is Mn.sup.+2, Cu.sup.+2, Zn.sup.+2, or Fe.sup.+2, and 0.01y1. Exemplary layered double hydroxide hydrogels (LDH-gels) may comprise a hydrogel and at least one LDH. Exemplary hydrogels may comprise polyethylene (glycol) diacrylate (PEGDA) or polyacrylamide (PAAm). Exemplary LDH-gels may comprise at least one LDH comprising a compound of formula Mg.sub.4-yAlX.sub.y(OH).sub.2, wherein X is Mn.sup.+2, Cu.sup.+2, Zn.sup.+2, or Fe.sup.+2, and 0.01y1.

The invention presented concerns a process for the manufacture of coated, nano-scale, hydrotalcites, where the individual, primary, nano-scale hydrotalcite particles are coated. In order to obtain the corresponding hydrotalcite particles in coated, nano-scale form, the additive precipitation reaction is employed invention-related. Every primary particle indicates its own coating in this case. In a further aspect, the registration is directed toward coated primary, nano-scale, hydrotalcite particles, in particular obtainable in accordance with the invention-related process. A further aspect of the invention is directed toward composites containing nano-scale hydrotalcites, in particular hydrotalcites manufactured in accordance with the invention presented. Finally the registration presented is directed towards compositions containing mixtures of magnesium hydroxide and hydrotalcite.

The present invention provides and produces a high-grade layered double hydroxide (LDH) dense body having a relative density of 88% or greater in a simple and stable manner. The present invention provides a LDH dense body including a layered double hydroxide as a main phase and having a relative density of 88% or greater, the LDH being represented by general formula: M.sup.2+.sub.1-xM.sup.3+.sub.x(OH).sub.2A.sup.n.sub.x/n.mH.sub.2O wherein M.sup.2+ is a divalent cation, M.sup.3+ is a trivalent cation, A.sup.n is an n-valent anion, n is an integer of 1 or greater, and x is 0.1 to 0.4. This LDH dense body can be produced by compacting and firing a raw material powder of a LDH to obtain an oxide fired body, retaining this oxide fired body in or immediately above an aqueous solution comprising an n-valent anion to reproduce the LDH, and removing excessive water from the resulting water-rich LDH solidified body.

The present invention relates to a method for extracting magnesium and lithium and also producing layered double hydroxides (LDH) from brine, comprising the steps of: adding an aluminum salt to brine, to prepare a mixed salt solution A for preparing MgAl-LDH; adding an alkaline solution to carry out co-precipitation, followed by crystallization; after the crystallization is complete, performing solid-liquid separation to obtain a solid product of MgAl-LDH and a filtrate; concentrating the filtrate by evaporation to obtain a lithium-rich brine, adding an aluminum salt thereto to prepare a mixed salt solution B for preparing LiAl-LDH; adding the mixed salt solution B to an alkaline solution to carry out precipitation; after the precipitation is complete, performing solid-liquid separation to obtain a solid product of LiAl-LDH and a filtrate; and concentrating the filtrate by evaporation, returning the solution concentrated by evaporation to the lithium-rich brine for recycled use. This method uses mild reaction and simple equipment, has a small loss of Li, can achieve isolation of resources from salt lakes, and can also obtain functional materials having a high added value.

This lithium transition metal composite oxide, which configures a secondary battery positive electrode active material, is a composite oxide represented by general formula Li.sub.[Li.sub.xMn.sub.yCo.sub.zMe.sub.(1-x-y-z)]O.sub.2 (in the formula, Me is at least one species selected from Ni, Fe, Ti, Bi and Nb, and 0.5<<1, 0.05<x<0.25, 0.4<y<0.7, and 0<z<0.25), and has at least one crystal structure selected from the O2 structure, the T2 structure and the O6 structure. The ratio (Co2/Co1) of the Co molar fraction (Co2) in the surface of the oxide to the Co molar fraction (Co1) in the entire lithium transition metal composite oxide is 1.2<(Co2/Co1)<6.0.

Provided is a method for manufacturing nanostructured layered double hydroxides (LDHs) having a uniform size distribution with homogenous nano-disc morphology. Disclosed method has three main steps of: pretreatment of metal wires; wire-explosion in a liquid phase; and finally, centrifugation and drying the as-prepared colloidal products to obtain the LDHs nanostructured dried powder.

The invention provides a cathode material for L1-ion batteries. The material has the formula of 0.5Li.sub.2MnO.sub.3-0.5LiM-n.sub.0.5Ni.sub.0.35Co.sub.0.15O.sub.2. The material was synthesized using the self-ignition combustion method, which previously has not been used for the preparation of Li-rich layered metal oxides. The cathode material exhibits capacities of 290, 250, and 200 mAh/g at discharge rates of C/20, C/4 and C rates, respectively. Moreover, the new material exhibits high rate cycling ability with little or no capacity fade for over 100 cycles demonstrated at a series of rates from C/20 to 2C rates for electrodes loadings of 7-8 mg/cm.sup.2.

The present invention discloses a method preparing a TiO.sub.2 nanostructure comprising: mixing an organic acid and an aminoalcohol to form an ionic liquid; heating the ionic liquid with titanium ions and lithium ions to form a layered structure; and annealing the mixture to form the TiO.sub.2 nanostructure. There is also provided uses of the prepared nanostructure.

A sintering powder, wherein a least a portion of the particles making up the sintering powder comprise: a core comprising a first material; and a shell at least partially coating the core, the shell comprising a second material having a lower oxidation potential than the first material.