Photo-Fenton degradation of organic pollutants using a zinc oxide decorated iron oxide/reduced graphene oxide nanocomposite

详细信息    查看全文

• 作者：Devi Prashad Ojha^a ; Mahesh Kumar Joshi^b ; ^c ; Han Joo Kim^a ; ^d ; ^{khanjoo@jbnu.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Photo-Fenton ; Methylene blue (MB) ; Photodegradation ; Fe3O4 nanospheres ; Hydrothermal ; Reduced Graphene oxide (rGO)
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1290-1297
• 全文大小：1345 K

文摘

Herein, we report a magnetically-separable tertiary composite, zinc oxide-decorated iron oxide deposited reduced graphene oxide (ZnO-Fe₃O₄/rGO), as a heterogeneous catalyst for photo-Fenton degradation of organic pollutants in aqueous media under ambient conditions. In this study, zinc oxide nanoparticles were hydrothermally deposited on the surface of Fe₃O₄/GO composite that was synthesized by a solvothermal process. The physicochemical properties of the as–synthesized composite were explored using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and photoluminescence (PL) studies. The as-prepared catalyst showed superior stability and, due to the presence of the magnetic Fe₃O₄ nanospheres, could be conveniently separated from the reaction system with an external magnet for reuse. The as-synthesized, ZnO-Fe₃O₄/rGO composite exhibited superior catalytic activity for the degradation of azo-dye compared to pristine ZnO, ZnO/Fe₃O₄, Fe₃O₄, and Fe₃O₄/GO. These results revealed the synergistic effects between the different components of the catalyst and confirmed the rapid redox reaction between Fe²⁺ and Fe³⁺. It was also observed that this catalytic behavior could be reproduced in consecutive experiments without a considerable decrease in efficiency. All of these merits indicate that the composite catalyst is a promising candidate for the degradation of organic compounds under visible light in environmental remediation applications.