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Changes in the structure of MgxAly(OH)z layered double hydroxides during the adsorption of organic compounds

Abstract : Layered double hydroxides (LDHs) are used as sorbents, catalysts, and carriers for catalytic species. In general, they are natural or synthetic minerals with part of their cations being replaced isomorphically with cations of higher oxidation states, which results in the formation of positively charged two-dimensional layers containing solvate molecules and counterions capable of anion exchange [1]. LDHs are solid bases [2]. Since there are both Brønsted and Lewis sites, anion exchange processes occur in the interlayer internal space of LDHs [3]. The interlayer distance depends on the nature of anions and solvate molecules as well as the degree of isomorphic substitution. When the interlayer distance changes, LDH properties also change (for example, sorption capacity changes because of the changing number of available active sites). A study of the LDH structure and its changes during the sorption of various compounds provides conclusions about the mechanism of these processes and prospects of creating new materials with desired properties. This work reveals regular changes in the structure of synthetic MgxAly(OH)z hydrotalcites of various composition, which occur during the adsorption of amyl alcohol, naphthalene, and β-naphthol. The hydrotalcite structure is shown in Fig. 1.
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E.O Butenko, E.V. Kapustina, A.E. Kapustin, V.S. Kracvenko, S.A. Gromilov, et al.. Changes in the structure of MgxAly(OH)z layered double hydroxides during the adsorption of organic compounds. Journal of Structural Chemistry, Springer Verlag (Germany), 2011, 52 (2), pp.436-438. ⟨10.1134/S0022476611020284⟩. ⟨insu-00730921⟩

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