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Synthesis of Li/Al layered double hydroxide-guest composites under mild acid conditions

Published online by Cambridge University Press:  09 July 2018

Deng-Shiu Yang
Affiliation:
Department of Industrial Management, Fortune Institute of Technology, Kaoshiung, Taiwan, 831
Ming-Kuang Wang
Affiliation:
Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan, 106
Shan-Li Wang
Affiliation:
Department of Soil and Environmental Sciences, National Chung-Hsing University, Taichung, Taiwan, 402

Abstract

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 acidsensitive anions, Fe(CN)64−, Li/Al LDH-Fe(CN)64− 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 ≈ 9).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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