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Clay Minerals; June 2004; v. 39; no. 2; p. 115-121; DOI: 10.1180/0009855043920124
© 2004 Mineralogical Society of Great Britain and Ireland
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Synthesis of Li/Al layered double hydroxide-guest composites under mild acid conditions

DENG-SHIU YANG1,2, MING-KUANG WANG2 and SHAN-LI WANG3

1 Department of Industrial Management, Fortune Institute of Technology, Kaoshiung, Taiwan, 831, 2 Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, 106, and 3 Department of Soil and Environmental Sciences, National Chung-Hsing University, Taichung, Taiwan, 402

* E-mail: mkwang{at}ccms.ntu.edu.tw

(Received 26 February 2003; revised 20 September 2003)

Layered double hydroxides (LDHs) are known as ‘anionic clays’. They comprise a class of material with positively charged octahedral double hydroxyl layers and exchangeable anions. The Li/Al LDH term includes a group of LDHs with Li/Al octahedral double hydroxyl layers. We have demonstrated a modifed method, using Li/Al LDH-OH (OH– as interlayer anions) as the starting material, for preparing Li/Al LDH-X (X represents interlayer anions, including dioctyl sulphosuccinate (DOSS), dodecyl sulphate (DDS), mercaptoacetate (MA), EDTA, Tiron and dichromate) under mild acid conditions (pH in the range 4 to 5). However, in the case of acid-sensitive anions, Fe(CN)4–6, Li/Al LDH-Fe(CN)4–6 can be prepared by a two-step procedure using Li/Al LDH-DOSS or similar compounds as intermediates to react with acid-sensitive anions under mild alkaline conditions (pH {approx} 9).

KEYWORDS: layered double hydroxide, LDH, anionic clay, intercalation, organic anion, oxometallic anion, organometallic anion






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