XPS STUDIES OF AMINO-ACIDS ADSORBED ON TITANIUM-DIOXIDE SURFACES

被引：87

作者：

SCHMIDT, M

STEINEMANN, SG

机构：

[1] Institut de Physique Expérimentale, Université de Lausanne, Lausanne-Dorigny

来源：

FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY | 1991年 / 341卷 / 5-6期

关键词：

D O I：

10.1007/BF00321947

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Adsorption of amino acids from aqueous solutions on TiO2 surfaces as a function of pH is monitored quantitatively by X-ray photoelectron spectroscopy (XPS). Because of the amphoteric character of the TiO2 and the "zwitterionic" behaviour of the amino acids the pH of adsorption indicates what chemical groups are involved in the adsorption reaction. The results confirm the ligand exchange model: in acidic milieu the carboxylic group replaces a basic surface hydroxyl group on a Ti site and binds to this Ti. For homocysteine the resulting position of the adsorbed molecule can also be concluded by comparing peak intensities.

引用

页码：412 / 415

页数：4

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