Visible light-driven mesoporous Au-TiO₂/SiO₂ photocatalysts for advanced oxidation process

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• 作者：Ritu Malik^a ; Vandna Chaudhary^b ; Vijay K. Tomer^c ; Pawan S. Rana^a ; ^{drpawansrana.phy@dcrustm.org" class="auth_mail" title="E-mail the corresponding author} ; S.P. Nehra^b ; Surender Duhan^c
• 关键词：Photocatalyst ; Rose Bengal ; Au nanoparticles ; Mesoporous
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：42
• 期：9
• 页码：10892-10901
• 全文大小：3736 K

文摘

Au–TiO₂/SiO₂ heterogeneous catalysts with different Au contents were successfully synthesized by a facile hydrothermal process and their photocatalytic activity towards reduction of Rose Bengal (RB), Methyl Blue (MB), Rhodamine B (RhB) and Congo Red (CR) was investigated in the presence of sodium borohydride (NaBH₄) for advanced oxidation process (AOP). The results reveal that 3 wt% Au loaded in TiO₂/SiO₂ can significantly degrade high RB concentration dye (>95%, 0.3 g/L, 12 pH) within 20 min of irradiation time. All catalysis reaction followed the pseudo-first order rate reaction with high correlation coefficient. The effect of loading of Au nanoparticles (1–5 wt%) along with variation in dye concentration (100–500 ppm), pH of solution (2–12), catalysts dosage (0.1–0.5 g/L), and reaction temperature (30–80 °C) were also studied. The present works shows the superior performance of Au–TiO₂/SiO₂ heterogeneous catalysts to be related to the high dispersion of Au nanoparticles in the TiO₂/SiO₂ and to the catalytic effect between gold and TiO₂.