Environmental catalysis and materials

Bioaccumulation of heavy metals in fishes from Taihu Lake, China


LIU Yue , WANG Hai-qiang , WU Zhong-biao

DOI:

Received March 02, 2007,Revised April 23, 2007, Accepted , Available online

Volume 19,2007,Pages 1505-1509

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A series of nanosized ion-doped TiO2<\sub> catalysts with di erent ion content (between 0.1 at.% and 1.0 at.%) have been prepared by wet impregnation method and investigated with respect to their behavior for UV photocatalytic oxidation of nitric oxide. The catalytic activity was correlated with structural, electronic and surface examinations of the catalysts using X-ray di raction analysis (XRD), ultraviolet-visible (UV-Vis) absorption spectroscopy, transmission electron microscopy (TEM), energy disperse spectrometer (EDS) and high resolution-transmission electron microscopy (HR-TEM) techniques. An enhancement of the photocatalytic activity was observed for Zn2+<\sup> doping catalyst ranged from 0.1 at.% to 1.0 at.% which was attributed to the lengthened lifetime of electrons and holes. The improvement in photocatalytic activity could be also observed with the low doping concentration of Cr3+<\sup> (0.1 at.%). However, the doping of Fe3+<\sup>, Mo6+<\sup>, Mn2+<\sup> and the high doping concentration of Cr3+<\sup> had no contribution to photocatalytic activity of nitric oxide.

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