Photodeposition of CdSe using Se-TiO₂ suspensions as photocatalysts

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• 作者：Vi Nu Hoai Nguyen ; Rose Amal and Donia Beydoun
• 关键词：Cadmium selenide ; Photocatalytic reduction ; Titanium dioxide ; Mechanism ; Morphology
• 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
• 出版年：2006
• 期刊代码：66_10106030
• 类别：ch
• 出版时间：1 April 2006
• 卷：179
• 期：1-2
• 页码：57-65
• 文件大小：366 K

摘要

The photodeposition of cadmium selenide (CdSe) using Se-TiO₂ photocatalysts was studied at pH 3.5 and 7 in the presence of formic acid. The Se-TiO₂ photocatalysts were obtained by Se ion photoreduction using selenite (Se(IV)) and selenate (Se(VI)) as precursors. The formation of cadmium selenide was attributed to the reaction between cadmium ions and selenide ions (Se²⁻) released from the Se deposited on TiO₂ particles under illumination. The release of the Se²⁻ ions from the Se–TiO₂ is believed to be the determining step for the formation of the CdSe particles, hence controlling their morphology as either rod-shaped or spherical. Metallic cadmium was also detected on the surface of TiO₂ particles as a product of the photocatalytic reduction at pH 7. Its formation was attributed to the photoreduction of cadmium by the photogenerated electrons in the TiO₂ and/or the Se semiconductors.