Effect of Component Oxide Interaction on the Adsorption Properties of Mixed Oxides

Xiaoguang Meng, Raymond D. Letterman

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80 Scopus citations

Abstract

Aqueous suspension of two mixed oxides [Al(OH)3/SiO2 and Fe(OH)3/SiO2] were used to study the effect of the nature of the interaction between the hydroxide and silica on the uptake of Cd2+ and Ca2+. The combined results of transmission electron microscopy, deuterium exchange experiments for surface-site concentration determination, SiO2 dissolution, and electrokinetic measurements showed that the interaction between Al(OH)3 and SiO2 was relatively strong, while a discrete Fe(OH)3 phase was formed in the Fe(OH)3/SiO2 system. Enhanced Cd2+ and Ca2+ adsorption occurred on SiO2 partially covered by Al(OH)3 compared to adsorption on the component oxides. The adsorption on SiO2 completely covered by Al(OH)3 was essentially identical to uptake by Al(OH)3 without silica. In contrast, it appeared that Cd2+ was adsorbed on the independent Fe(OH)3 and SiO2 phases in the Fe(OH)3/SiO2 suspension.

Original languageEnglish
Pages (from-to)970-975
Number of pages6
JournalEnvironmental Science and Technology
Volume27
Issue number5
DOIs
StatePublished - 1993

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