TY - JOUR
T1 - Photocatalytic reduction of heavy metal ions on derivatized titanium dioxide nano-particle surface studied by XAFS
AU - Chen, Lin X.
AU - Rajh, Tijana
AU - Mićić, Olga
AU - Wang, Zhiyu
AU - Tiede, David M.
AU - Thurnauer, Marion
N1 - Funding Information:
This work is supportedb y Office of Basic Energy Science,U S Departmento f Energy under contract W-31-109-Eng-38.W e thank Dr. Farrel Lytle for his Hg” spectraa nd discussionsW. e also greatlya ppreciatet he support from Dr. Pedro A. Montano and the personnela t beamlineX 18B, NSLS, BrookhavenN ational Laboratory.
PY - 1997/12/2
Y1 - 1997/12/2
N2 - 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.
AB - 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.
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U2 - 10.1016/S0168-583X(97)00546-6
DO - 10.1016/S0168-583X(97)00546-6
M3 - Article
AN - SCOPUS:0031550001
SN - 0168-583X
VL - 133
SP - 8
EP - 14
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1-4
ER -