PROTONATION OF PHOSPHATE ON THE SURFACE OF GOETHITE AS STUDIED BY CIR-FTIR AND ELECTROPHORETIC MOBILITY

被引：476

作者：

TEJEDORTEJEDOR, MI

ANDERSON, MA

机构：

[1] Water Chemistry Program, University of Wisconsin, Madison, Wisconsin 53706

来源：

LANGMUIR | 1990年 / 6卷 / 03期

关键词：

Electrophoresis - Phosphates--Adsorption - Spectroscopy--In Situ - Suspensions;

D O I：

10.1021/la00093a015

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

CIR-FTIR spectroscopic studies have provided evidence for the formation of three different type of complexes, protonated and nonprotonated bridging bidentate as well as a nonprotonated monodentate, between orthophosphate ions and surface Fe(III) of a-FeOOH particles in aqueous suspensions. The speciation of these complexes is a function of pH and phosphate surface coverage (F). Furthermore, the combination of CIR-FTIR, adsorption isotherm, and electrophoretic mobility data allows us to calculate the intrinsic pK value (4.6) for the bridging bidentate iron phosphate surface complex. © 1990, American Chemical Society. All rights reserved.

引用

页码：602 / 611

页数：10

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