Adsorption of Suwannee River fulvic acid on aluminum oxyhydroxide surfaces: An in situ ATR-FTIR study

被引：47

作者：

Yoon, TH

Johnson, SB

Brown, GE ^{[1
]}

机构：

[1] Stanford Univ, Dept Geol & Environm Sci, Surface & Aqueous Geochem Grp, Stanford, CA 94305 USA

[2] SLAC, Stanford Synchrotron Radiat Lab, Menlo Pk, CA 94025 USA

来源：

LANGMUIR | 2004年 / 20卷 / 14期

关键词：

D O I：

10.1021/la0499214

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The adsorption of Suwannee River fulvic acid (SRFA) on boehmite, gammaw-AIO(OH), has been examined by both macroscopic adsorption and in situ ATR-FTIR spectroscopic techniques. At a SRFA concentration approaching surface saturation (Gamma = 5.3 mumol m(-2)), adsorption is at a maximum at low pH and decreases as pH is increased. The ATR-FTIR spectral features of adsorbed SRFA are very similar to those measured approximately 1-2 pH units higher in solution, indicating that (i) the SRFA appears to be predominantly adsorbed at the boehmite/water interface in an outer-sphere complexation mode and (ii) the positively charged boehmite/water interface stabilizes SRFA molecules against protonation at low pH.

引用

页码：5655 / 5658

页数：4