Degradation of bisphenol A by hydrogen peroxide activated with CuFeO₂ microparticles as a heterogeneous Fenton-like catalyst: Efficiency, stability and mechanism

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• 作者：Xinyue Zhang ; Yaobin Ding ; Heqing Tang ; Xiaoyan Han ; Lihua Zhu ; Nan Wang
• 关键词：Oxidative degradation ; Bisphenol A ; Fenton process ; Micro-scaled catalyst ; CuFeO2
• 刊名：Chemical Engineering Journal
• 出版年：15 January, 2014
• 年：2014
• 卷：236
• 期：Complete
• 页码：251-262
• 全文大小：1149 K

文摘

CuFeO₂ microparticles were prepared, characterized and used as a heterogeneous Fenton-like catalyst. The as-prepared CuFeO₂ microparticles were composed of pure rhombohedral crystalline particles with sizes in the range of 2-3 渭m. As a composite oxide of Cu and Fe elements, the CuFeO₂ microparticles showed much stronger catalytic ability toward the activation of H₂O₂ than Cu₂O microparticles and Fe₃O₄ nanoparticles did. The catalytic activation of H₂O₂ produced hydroxyl radicals (OH), causing rapid degradation and mineralization of bisphenol A (BPA). The use of 1.0 g L^鈭? CuFeO₂ microparticles and 20 mmol L^鈭? H₂O₂ yielded a nearly complete removal of the added BPA (0.1 mmol L^鈭?) in 120 min and 85% removal of TOC in 180 min. The microscaled CuFeO₂ catalyst was confirmed to have merits of easy recycling and good stability by successive degradation experiments. The generation of OH from the catalytic activation of H₂O₂ over CuFeO₂ microparticles was evidenced using electron spin resonance spectroscopy, quenching experiment and coumarin fluorescent probe technique. This activation was confirmed to be initiated by surface Cu(I) and Fe(III).