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

Xiaoguang Meng; Raymond D. Letterman

doi:10.1021/es00042a021

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

Xiaoguang Meng
, Raymond D. Letterman

Department of Civil, Environmental and Ocean Engineering

Syracuse University

Research output: Contribution to journal › Article › peer-review

81 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 language	English
Pages (from-to)	970-975
Number of pages	6
Journal	Environmental Science and Technology
Volume	27
Issue number	5
DOIs	https://doi.org/10.1021/es00042a021
State	Published - 1993

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title = "Effect of Component Oxide Interaction on the Adsorption Properties of Mixed Oxides",

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.",

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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

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SN - 0013-936X

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JO - Environmental Science and Technology

JF - Environmental Science and Technology

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

Abstract

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