Layered double hydroxides (LDH) — a wide family of compounds involving representatives of closely related mineral groups, including hydrotalcite-manasseite, quintinite, woodwardite, meixnerite and hydrocalumite-kuzelite groups, as well as their numerous synthetic analogues (Strunz and Nickel 2001, Rives 2001, Khan and O’Hare 2002). In the past decades, LDH attracted considerable attention due to their chemical and structural features applicable in different fields of industry. These compounds are easily synthesized in water solutions under ambient conditions. LDH adopt huge variety of cations inside hydroxide slabs, making possible easy preparation of oxide catalysts by simple heat treatment. But the most striking and useful peculiarity is their anion-exchange properties. Contrary to large number of cation-exchangers related to different classes of compounds, number of known anion-exchange frameworks is rather limited. Among them, LDH (also known as “anionic clays”) are quite unique because they may adopt and exchange tenths of different anions (Miyata and Kimura 1973, Miyata 1975, Miyata and Okada 1977, Rives 2001, Khan and O’Hare 2002, Kloprogge et al. 2002 and the references cited herein). As a consequence, they are widely used for selective extraction of anions, purification of solutions and preparation of different types of combined catalysts.