Materials Transactions Online

Materials Transactions, Vol.47 No.03 (2006) pp.923-930
© 2006 The Mining and Materials Processing Institute of Japan

Preparation and Characterisation of Mg–Al Layered Double Hydroxides Intercalated with 2-Naphthalene Sulphonate and 2,6-Naphthalene Disulphonate

Tomohito Kameda, Masami Saito and Yoshiaki Umetsu

Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan

A Mg–Al layered double hydroxide (Mg–Al LDH) has been modified with aromatic anions by a coprecipitation technique. This method is based on the anion-exchange characteristics of the hydrotalcite-type compound which intercalates various anions, including anions of organic acids, in the interlayer. The Mg–Al LDHs are intercalated with 2-naphthalene sulphonate (2-NS-) and 2,6-naphthalene disulphonate (2,6-NDS2-) ions, which contain a naphthalene ring with one and two sulphonate (–SO3-) groups in their structures, respectively. They are formed by the dropwise addition of a mixed aqueous solution of Mg(NO3)2 and Al(NO3)3 (Al/Mg mole ratio = 1/3) to a solution containing the individual organic anion at a constant pH of 10.0. The Mg–Al LDHs modified with aromatic anion are expected to recognize and selectively uptake hazardous aromatic compounds, such as bisphenol A, from aqueous solutions. The composite materials prepared were characterized by X-ray diffraction, FT-IR spectroscopy and chemical analyses.
2-NS- was observed to be intercalated into the interlayer almost fully up to the accommodation expected based on the neutralisation of the positive charge of the host lattice. The intercalation of 2,6-NDS2- was approximately 80% of the expected value, however. IR analysis results show that the organic anions are intercalated into the Mg–Al LDH without any significant change in their intrinsic structure.
The X-ray diffraction data suggest that the intercalation of the organic anions under consideration was accompanied by an expansion in the basal spacing of the LDHs. The X-ray diffraction patterns of the 2-NS--modified LDH suggested the formation of two types of LDHs showing different basal spacing at higher 2-NS- content. On the other hand, the 2,6-NDS--modified LDH showed diffraction peaks, which corresponded to the basal spacing, with widely spreading peak angles and reduced intensity, suggesting the widely varying basal spacing of the Mg–Al LDH.

(Received 2005/11/16; Accepted 2006/1/12; Published 2006/3/15)

Keywords: Magnesium–aluminum layered double hydroxide, 2-naphthalene sulphonate ion, 2,6-naphthalene disulphonate ion, Anion intercalation

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