Highly efficient catalytic reductive degradation of various organic dyes by Au/CeOâ‚‚-TiOâ‚‚ nano-hybrid

Journal of Chemical Sciences

ABU T MIAH²  PARTHA P DAS¹  PRANJAL SAIKIA1² 

[1] Department of Physics, NIT Karnataka, Surathkal, Mangalore 575 025, Karnataka, India$$;Department of Applied Sciences (Chemical Science Division), GUIST, Gauhati University, Guwahati 781 014, Assam, India$$

关键词: Nanocomposite;    Gold nanoparticles;    Au/CeO₂;    -TiO₂;    Organic dye;    Catalytic reduction;    Nanohybrid.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Highly improved catalytic reductive degradation of different organic dyes, in the presence of excess NaBHâ‚„ over Au/CeOâ‚‚-TiOâ‚‚ nano-hybrid as the catalyst is reported in this study. CeOâ‚‚-TiOâ‚‚ 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/CeOâ‚‚-TiOâ‚‚ 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/CeOâ‚‚-TiOâ‚‚ nano-hybrid along with NaBHâ‚„ 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.

【 授权许可】

Unknown