Synthesis and characterization of plasmonic and magnetically separable Ag/AgCl-Bi₂WO₆@ Fe₃O₄@SiO₂ core-shell composites for visible light-induced water detoxification

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• 作者：Xiangchao Meng ^{xmeng086@uottawa.ca" class="auth_mail" title="E-mail the corresponding author} ; Zisheng Zhang ; ^{zzhang@uottawa.ca" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Photocatalysis ; Visible light ; Magnetic separation ; Bi2WO6 ; Ag/AgCl
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：485
• 期：Complete
• 页码：296-307
• 全文大小：5350 K

文摘

A magnetic photocatalyst composite (Ag/AgCl-Bi₂WO₆) was proposed and investigated. Magnetic Bi₂WO₆ was hydrothermally loaded onto silica-coated Fe₃O₄ which was synthesized by coprecipitation in addition to a modified Stöber process. Ag nanoparticles were then photoreduced on the surface of Bi₂WO₆. The prepared samples were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and ultraviolet–visible light diffuse reflectance spectroscopy. Magnetic properties were investigated using a superconducting quantum interface magnetometer, with samples exhibiting quasi-superparamagnetic behaviour. The visible light-induced photocatalytic activities were evaluated by degrading a model dye, RhB, as well as a colourless aromatic organic compound, phenol. Samples found to possess an excellent performance in terms of detoxification. Pathways and mechanisms for the photocatalytic degradation of organic compounds in the presence of Ag/AgCl-(M) Bi₂WO₆ were also investigated and proposed.