Modeling Ion Adsorption on Aluminum Hydroxide Modified Silica

Xiaoguang Meng; Raymond D. Letterman

doi:10.1021/es00046a023

Modeling Ion Adsorption on Aluminum Hydroxide Modified Silica

Xiaoguang Meng, Raymond D. Letterman

Department of Civil, Environmental and Ocean Engineering

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

50 Scopus citations

Abstract

The effect of component hydroxide and oxide interaction on Cd²⁺ and SO₄²⁻ adsorption in suspensions of Al(OH)₃/ SiO₂ was modeled using two kinds of surface site distributions incorporated in the triple-layer surface complexation model. The mixed site distribution assumes that Al(OH)₃ surface sites are uniformly distributed on the SiO₂ surface with the overall surface potential contributed by both Al(OH)₃ and SiO₂ surface sites. The patch site distribution assumes that two kinds of surfaces are present on the particle and that the double layer associated with one surface does not affect surface reactions on the other. Enhanced Cd²⁺ adsorption and reduced SO₄²⁻ adsorption at low Al to SiO₂ ratios were modeled using the mixed site distribution. The modeling results suggest that the change in surface potential caused by the formation of Al(OH)₃ on SiO₂ surface has significant effects on Cd²⁺ and SO₄²⁻ adsorption.

Original language	English
Pages (from-to)	1924-1929
Number of pages	6
Journal	Environmental Science and Technology
Volume	27
Issue number	9
DOIs	https://doi.org/10.1021/es00046a023
State	Published - 1993

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title = "Modeling Ion Adsorption on Aluminum Hydroxide Modified Silica",

abstract = "The effect of component hydroxide and oxide interaction on Cd2+ and SO42− adsorption in suspensions of Al(OH)3/ SiO2 was modeled using two kinds of surface site distributions incorporated in the triple-layer surface complexation model. The mixed site distribution assumes that Al(OH)3 surface sites are uniformly distributed on the SiO2 surface with the overall surface potential contributed by both Al(OH)3 and SiO2 surface sites. The patch site distribution assumes that two kinds of surfaces are present on the particle and that the double layer associated with one surface does not affect surface reactions on the other. Enhanced Cd2+ adsorption and reduced SO42− adsorption at low Al to SiO2 ratios were modeled using the mixed site distribution. The modeling results suggest that the change in surface potential caused by the formation of Al(OH)3 on SiO2 surface has significant effects on Cd2+ and SO42− adsorption.",

author = "Xiaoguang Meng and Letterman, {Raymond D.}",

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T1 - Modeling Ion Adsorption on Aluminum Hydroxide Modified Silica

AU - Meng, Xiaoguang

AU - Letterman, Raymond D.

PY - 1993

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N2 - The effect of component hydroxide and oxide interaction on Cd2+ and SO42− adsorption in suspensions of Al(OH)3/ SiO2 was modeled using two kinds of surface site distributions incorporated in the triple-layer surface complexation model. The mixed site distribution assumes that Al(OH)3 surface sites are uniformly distributed on the SiO2 surface with the overall surface potential contributed by both Al(OH)3 and SiO2 surface sites. The patch site distribution assumes that two kinds of surfaces are present on the particle and that the double layer associated with one surface does not affect surface reactions on the other. Enhanced Cd2+ adsorption and reduced SO42− adsorption at low Al to SiO2 ratios were modeled using the mixed site distribution. The modeling results suggest that the change in surface potential caused by the formation of Al(OH)3 on SiO2 surface has significant effects on Cd2+ and SO42− adsorption.

AB - The effect of component hydroxide and oxide interaction on Cd2+ and SO42− adsorption in suspensions of Al(OH)3/ SiO2 was modeled using two kinds of surface site distributions incorporated in the triple-layer surface complexation model. The mixed site distribution assumes that Al(OH)3 surface sites are uniformly distributed on the SiO2 surface with the overall surface potential contributed by both Al(OH)3 and SiO2 surface sites. The patch site distribution assumes that two kinds of surfaces are present on the particle and that the double layer associated with one surface does not affect surface reactions on the other. Enhanced Cd2+ adsorption and reduced SO42− adsorption at low Al to SiO2 ratios were modeled using the mixed site distribution. The modeling results suggest that the change in surface potential caused by the formation of Al(OH)3 on SiO2 surface has significant effects on Cd2+ and SO42− adsorption.

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Modeling Ion Adsorption on Aluminum Hydroxide Modified Silica

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