Highly efficient catalytic reductive degradation of various organic dyes by Au/CeO ₂ -TiO ₂ nano-hybrid

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• 作者：PRANJAL SAIKIA ; ABU T MIAH ; PARTHA P DAS
• 关键词：Nanocomposite ; gold nanoparticles ; Au/CeO2 ; TiO2 ; organic dye ; catalytic reduction ; Nano ; hybrid.
• 刊名：Journal of Chemical Sciences
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：129
• 期：1
• 页码：81-93
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry/Food Science, general;
• 出版者：Springer India
• ISSN：0973-7103
• 卷排序：129

文摘

Highly improved catalytic reductive degradation of different organic dyes, in the presence of excess NaBH₄ over Au/CeO₂-TiO₂ nano-hybrid as the catalyst is reported in this study. CeO₂-TiO₂ nanocomposite was prepared by a facile co-precipitation method using ultra-high dilute aqueous solutions. Small amount of Au (only 1 wt%) was loaded onto the nanocomposite material by deposition-precipitation with urea (DPU) method to fabricate the ternary Au/CeO₂-TiO₂ nano-hybrid. The catalysts were characterized by the representative techniques like XRD, BET surface area, ICP-AES, UV-Vis diffuse reflectance spectroscopy, TEM and XPS. The Au/CeO₂-TiO₂ nano-hybrid along with NaBH₄ exhibited remarkable catalytic activities towards all the probed dyes, namely Methylene Blue, Methyl Orange, Congo Red, Rhodamine B and Malachite Green, with a degradation efficiency of ∼100% in a short reaction time. The degradation reaction followed pseudo-first-order kinetics with respect to the concentration of the dye. Different parameters that affect the rate of the reaction are discussed. A plausible mechanism for methylene blue degradation has also been proposed.