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Layered double hydroxide (LDH) is an inorganic compound with a layered structure and exhibits anion−exchange properties. Its basic chemical composition is [M2+1−xM3+x(OH)2](An– )x/nmH2O, where x is the M3+/(M2+ + M3+) molar ratio and An– indicates an anion with a valency of n (Ingram and Taylor, 1967; Allmann, 1968; Taylor, 1973). Its crystal structure consists of positively charged brucite-like octahedral hydroxide layers containing M3+ at M2+ sites, which are electrically neutralized by the interlayer anions, and water molecules in the hydration shell of the intercalated anions occupying the remaining interlayer space. Among various types of LDHs composed of different compositions of M2+ and M3+, Mg−Al LDH has been used practically as an antacid and a flame retardant (Cavani et al., 1991). Mg−Al LDH intercalated with CO32− (CO3Mg−Al LDH) can be transformed into Mg−Al oxide by calcination at 450–800 °C according to the following reaction:

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Hybrid Inorganic/Organic Composites of Layered Double Hydroxides Intercalated with Organic Acid Anions for the Uptake of Hazardous Substances from Aqueous Solution