Fabrication of a Ag/Bi3TaO7 Plasmonic Photocatalyst with Enhanced Photocatalytic Activity for Degradation of Tetracycline

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• 作者：Bifu Luo ; Dongbo Xu ; Di Li ; Guoling Wu ; Miaomiao Wu ; Weidong Shi ; Min Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：7
• 期：31
• 页码：17061-17069
• 全文大小：621K
• ISSN：1944-8252

文摘

A novel Ag/Bi₃TaO₇ plasmonic photocatalyst has been prepared by a simple photoreduction process. The as-prepared Ag/Bi₃TaO₇ photocatalyst exhibited an enhanced photocatalytic activity for the degradation of tetracycline (TC) compared to that of a bare Bi₃TaO₇ catalyst. The 1 wt % Ag-loaded Bi₃TaO₇ sample showed the highest photocatalytic efficiency for TC degradation (85.42%) compared with those of the other samples. The enhanced photocatalytic activity could be ascribed to the synergistic effect of the surface plasmon resonance caused by Ag nanoparticles. Electrochemical impedance spectroscopy demonstrated that the incorporation of silver nanoparticles onto the Bi₃TaO₇ surface promoted the separation of photogenerated carriers. In addition, an electron spin resonance (ESR) and trapping experiment revealed that the photoinduced active species hydroxyl radical and superoxide radical were the main active species in the photocatalytic process of TC degradation. The photocatalytic reaction mechanism was discussed by active species trapping and ESR analysis.