Research Progress of Hydrotalcite-like compounds

Anion-exchange Properties of Hydrotalcite-like Compounds

-Ion-exchange isotherms between hydrotalcite-like compounds (HT) of the NO3-, CI-, and SO4forms and F , 0% Br , I , OH-, SO42-, CO3 z-, and Naphthol Yellow S (NYS 2-) ions were determined, and the spacing and the width of the 003 reflection were measured as a function of HT composition. The ion-exchange equilibrium constant for HTs of monovalent anions are in the sequence OH> F > Cl > Br> NO3> ...

Surface complexation reactions of inorganic anions on hydrotalcite-like compounds.

Complexation reactions of environmentally important inorganic anions such as nitrate, chloride, sulfate, arsenate, and phosphate on the surface of hydrotalcite-like compounds (HT) were investigated to understand the role of HT in the immobilization of hazardous anions in an alkaline environment. The effects of surface complexation reactions on the solid state properties of HT were also evaluate...

Syntheses of Disordered and A1-rich Hydrotalcite-like Compounds

-Hydrotalcite-like compounds, [Mg~ _xAlx(OH)2] x+ [xX-. n H20], where X= 1/2 CO32or OH , were prepared by hydrothermal syntheses at Pnzo = 100 MPa and T = 100~176 Starting materials were MgO, "y-A1203, H20 , and MgC204" 2H20. The synthesis depended on temperature, pressure, the A1/(A1 + Mg) ratio x, and the CO2 content of the starting material. Previously an A1 content of x = 0.33 was thought t...

Effect of hydrotalcite-like compounds on the aqueous solubility of some poorly water-soluble drugs.

A new approach of improving drug dissolution properties is described. This method exploits the property of a carrier owing to the hydrotalcite-type anionic clays (HTlc). HTlc is an inorganic layered solid that lodges anionic compounds among its layers. As HTlc dissolves at acidic pH values (pH < 4), the anions intercalated among the layers are promptly released in the medium. In this article so...

2H Solid-State NMR Investigation of Terephthalate Dynamics and Orientation inMixed-Anion Hydrotalcite-Like Compounds