TY - JOUR
T1 - Effect of Component Oxide Interaction on the Adsorption Properties of Mixed Oxides
AU - Meng, Xiaoguang
AU - Letterman, Raymond D.
PY - 1993
Y1 - 1993
N2 - 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.
AB - 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.
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U2 - 10.1021/es00042a021
DO - 10.1021/es00042a021
M3 - Article
AN - SCOPUS:0027235506
SN - 0013-936X
VL - 27
SP - 970
EP - 975
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 5
ER -