CHEMICAL AND SPECTROSCOPIC EVIDENCE FOR SPECIFIC ADSORPTION OF CHROMATE ON HYDROUS IRON-OXIDE

被引：58

作者：

HSIA, TH ^{[1
]}

LO, SL ^{[1
]}

LIN, CF ^{[1
]}

LEE, DY ^{[1
]}

机构：

[1] NATL TAIWAN UNIV,DEPT AGR CHEM,TAIPEI,TAIWAN

来源：

CHEMOSPHERE | 1993年 / 26卷 / 10期

关键词：

D O I：

10.1016/0045-6535(93)90083-H

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The adsorption of chromate from aqueous solution was investigated to understand the binding characteristics of chromate on hydrous iron oxide. Both chemical and spectroscopic analyses (EDAX, Energy Dispersive Analysis of X-Ray and FTIR, Fourier Transform Infrared) were used for characterizing the chromate adsorption sites on hydrous iron oxide. The zeta potential measurements were conducted for observation of the shift in isoelectric point of the system containing iron oxide suspension and various concentrations of chromate. The isoelectric point of the system containing more chromate was a few pH units lower than that of the system containing less chromate or no chromate. This phenomenon was attributed to an increase in the negative charge of the iron oxide surface as a result of adsorption of chromate. An inner-sphere coordination of chromate to iron oxide surface was identified from EDAX and FTIR results. Specific adsorption was therefore required to occur at the aqueous chromate anion and iron oxide interfaces.

引用

页码：1897 / 1904

页数：8

共 20 条

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