Polyhydroquinone-Coated Fe3O4 Nanocatalyst for Degradation of Rhodamine B based on Sulfate Radicals

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• 作者：Yanqiu Leng ; Weilin Guo ; Xiao Shi ; Yingyun Li ; Liting Xing
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：September 25, 2013
• 年：2013
• 卷：52
• 期：38
• 页码：13607-13612
• 全文大小：337K
• 年卷期：v.52,no.38(September 25, 2013)
• ISSN：1520-5045

文摘

In this study, the polyhydroquinone/Fe₃O₄ (PHQ/Fe₃O₄) was synthesized as a heterogeneous catalyst to activate persulfate to effectively degrade Rhodamine B (RhB). The synthetic PHQ/Fe₃O₄ nanoparticles were characterized using X-ray diffraction (XRD), transmission electron microscope (TEM), Brunauer鈥揈mmett鈥揟eller (BET) nitrogen adsorption, and Fourier-transform infrared (FTIR) spectra. PHQ/Fe₃O₄ shows better catalytic performance and excellent reusability than PHQ and Fe₃O₄. The results indicated that PHQ/Fe₃O₄ maintains quinone units and the presence of the quinone moieties successfully accelerates the degradation compared to Fe₃O₄, owing to the role of quinone assisting the redox cycling of Fe. Effects of PHQ/Fe₃O₄ addition, persulfate concentration, pH, and temperature on the degradation efficiency of RhB by persulfate are examined in batch experiments. Increasing the temperature may significantly accelerate the RhB degradation, and the degradation is found to follow the pseudo-first-order kinetic model. On the basis of these findings, the possible mechanism of RhB degradation was proposed.