Synthesis of Li/Al layered double hydroxide-guest composites under mild acid conditions
Journal
Clay Minerals
Journal Volume
39
Journal Volume
39
Journal Issue
2
Journal Issue
2
Pages
115-121
Start Page
115
End Page
121
ISSN
00098558
Date Issued
2004-06
Author(s)
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 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 ≈ 9).
Subjects
Anionic clay
Intercalation
Layered double hydroxide
LDH
Organic anion
Organometallic anion
Oxometallic anion
Type
journal article