Gadolinia-modified ceria photocatalyst for removal of lead (II) ions from aqueous solutions

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• 作者：Jiratchaya Ayawanna^a ; ^{ajiratchaya@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; WahTzu Teoh^a ; Sanyalak Niratisairak^b ; Kazunori Sato^a
• 关键词：Gadolinium oxide ; Cerium oxide ; Photocatalyst ; Lead ; Wastewater
• 刊名：Materials Science in Semiconductor Processing
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：40
• 期：Complete
• 页码：136-139
• 全文大小：1104 K

文摘

Gd₂O₃-modified CeO₂ particles are prepared by a solid-state reaction method, and are used to remove Pb(II) ions from aqueous solutions by a photoelectrodeposition. The UV–photocatalytic activity for Pb(II) ion removal of the Gd₂O₃-modified CeO₂ is significantly higher than that of pure CeO₂. A solid solution Gd_0.1Ce_0.9O_1.95 phase coexisting with the CeO₂ matrix phase shows a high ability of photoelectrodeposition for the Pb(II) ions removal, compared to the two-phases mixture of Gd₂O₃–CeO₂. The high photocatalytic activity is also supported by a strong photoluminescence (PL) signal from the Gd_0.1Ce_0.9O_1.95–CeO₂. The high activity can be due to a formation of heterojunctions between p-type Gd_0.1Ce_0.9O_1.95 and n-type CeO₂, promoting transfer of photogenerated electron–hole pairs and efficiency restraining recombination of the charges.