Photoreduction of heavy metal ions, Cu2+ and Hg2+, on TiO2 nano-particle surfaces, has been investigated by XAFS measurements. The effects of TiO2 surface modification reagents on the reaction efficiency have been studied. We observed a significant reaction efficiency enhancement when amino acid alanine was added to a mixture of 0.01 M Cu2+ and TiO2 nano-particles. Fifty percent of the adsorbed Cu2+ has been reduced to Cu0 after 1-h illumination with a UV-enhanced xenon lamp. Photoreduction of Hg2+ on TiO2 colloid surfaces was also investigated without and with thiolactic acid (TLA). In this case, the photoreduction efficiency for Hg2+ was lowered. Structures of metal ion surroundings in various complexes as well as their role in photoreduction of metal ions are discussed.
|Original language||English (US)|
|Number of pages||7|
|Journal||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|State||Published - Dec 2 1997|
ASJC Scopus subject areas
- Nuclear and High Energy Physics