Insights into the degradation of 2,4-dichlorophenol in aqueous solution by alpha-MnO2 nanowire activated persulfate: catalytic performance and kinetic modeling
Insights into the degradation of 2,4-dichlorophenol in aqueous solution by alpha-MnO2 nanowire activated persulfate: catalytic performance and kinetic modeling
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α-MnO2 纳米线活化过硫酸盐降解水溶液中 2,4-二氯苯酚的见解：催化性能和动力学模型
DOI：
10.1039/c6ra00008h
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Ren Hejun
中科院分区：
文献类型：
--
作者：
Zhao Yan;Zhao Yongsheng;Zhou Rui;Mao Yan;Tang Wen;Ren Hejun
采用水热法合成了α-MnO 2纳米线。这些纳米线有效地活化过硫酸盐（PS）用于2，4-二氯苯酚（DCP）氧化。通过X射线衍射、高分辨透射电子显微镜和能量色散X射线光谱对材料的形状和结构进行了表征。猝灭实验和电子顺磁共振实验结果表明，在α-MnO 2活化的PS体系中，2，4-DCP的降解是由stecOH和SO 4 stec −共同作用的。建立了一个新的动力学模型来描述污染物在本文所描述的条件下的恶化。在动力学研究的评价过程中，几个关键参数进行了研究，包括催化剂用量，PS浓度，pH值和温度。在20.0 mM PS、0.2 g L−1 α-MnO 2纳米线和30.0 °C下，2，4-DCP的最大去除率为90.2%。此外，α-MnO 2纳米线在重复使用5次后仍表现出相对稳定的催化活性。上述结果表明，α-MnO 2纳米线在活化PS降解废水中有机污染物方面具有良好的应用前景。
In this study, α-MnO2 nanowires were synthesized in a hydrothermal process. These nanowires efficiently activated persulfate (PS) for 2,4-dichlorophenol (DCP) oxidation. The shape and structure of the material were characterized through X-ray diffraction, high-resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy. Quenching tests and electron paramagnetic resonance were conducted, and the results revealed that both ˙OH and SO4˙− were responsible for the degradation of 2,4-DCP in the α-MnO2-activated PS system. A novel kinetic model was established to describe the deterioration of the contaminant under the conditions described in this paper. Several key parameters are investigated in the evaluation process of the kinetic study, including catalyst dosage, PS concentration, pH, and temperature. The maximum removal efficiency of 2,4-DCP was 90.2% at 20.0 mM PS, given 0.2 g L−1 α-MnO2 nanowires, and under a temperature of 30.0 °C. In addition, the α-MnO2 nanowires exhibited relatively stable catalytic activity after five instances of reuse. The aforementioned results indicate that α-MnO2 nanowires are promising catalysts for the activation of PS to degrade organic contaminants in wastewater.