Polypyrrole/reduced graphene oxide aerogel particle electrodes for high-efficiency electro-catalytic synergistic removal of Cr(VI) and bisphenol A
Polypyrrole/reduced graphene oxide aerogel particle electrodes for high-efficiency electro-catalytic synergistic removal of Cr(VI) and bisphenol A
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DOI：
10.1016/j.cej.2017.11.109
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发表时间：
2018-03
影响因子：
15.1
通讯作者：
Yimei Zhang;Dandan Zhang;Lincheng Zhou;Yalong Zhao;Jie Chen;Zhuang Chen;Fei Wang
中科院分区：
文献类型：
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作者：
Yimei Zhang;Dandan Zhang;Lincheng Zhou;Yalong Zhao;Jie Chen;Zhuang Chen;Fei Wang
本文首先合成了聚吡咯/还原氧化石墨烯气凝胶（PGAs）颗粒电极，并将其应用于三维电极体系中同时还原六价铬（Cr（VI））和氧化双酚A（BPA）。系统研究了pH值、Cr（VI）与BPA的浓度比、电压、PGA的质量体积比（S/L）等关键因素对电催化性能的影响。结果表明，在最佳条件下，30 min内Cr（VI）和BPA的去除率分别为98.52 ± 1.48%和98.00 ± 1.17%。此外，通过比较两种污染物的电催化动力学去除率，以及它们在混合溶液中的拟合度（kobs-Cr（VI）= 0.2019 min−1，kobs-BPA= 0.1463 min− 1）显著高于单组分水溶液中的拟合度（kobs-Cr（VI）= 0.0397 min−1，kobs-BPA= 0.0417 min−1），证明了两种污染物的协同作用。经过20个循环的实验，仍然有很高的污染物和总有机碳（TOC）的去除率，这表明优良的PGA的重复利用能力。更深入地，通过X射线光电子能谱（XPS）和扫描电子显微镜-能量色散X射线能谱（SEM-EDX）分析Cr（VI）的最终目的地。同时分析了Cr（VI）和dotOH氧化BPA的中间产物，提出了可能的降解途径。重要的是，Cr（VI）/BPA系统提供了一个显着的例子，“废物控制废物”的协同去除策略。
In this paper, synthesis of polypyrrole/reduced graphene oxide aerogel (PGAs) as particle electrodes and their application in three-dimensional electrode system for simultaneous reduction of hexavalent chromium (Cr(VI)) and oxidation of bisphenol A (BPA) were implemented firstly. Electro-catalytic properties were investigated systemically in terms of the influences of pivotal factors, such as pH, the concentration ratio of Cr(VI) and BPA, voltage and the ratio of PGAs mass to solution volume (S/L). The results showed superb removal rates of 98.52 ± 1.48% for Cr(VI) and 98.00 ± 1.17% for BPA within 30 min under the optimal conditions. Furthermore, synergy of both pollutants was testified by the comparison of removal rates in electro-catalytic kinetics and their fitting in mixed solution with kobs-Cr(VI)= 0.2019 min−1, kobs-BPA= 0.1463 min−1significantly higher than that in one-component aqueous solution (kobs-Cr(VI)= 0.0397 min−1, kobs-BPA= 0.0417 min−1). After 20 cycles of experiments, there were still high contaminants and total organic carbon (TOC) removal rates, which showed excellent reutilized ability of PGAs. More deeply, final destination of Cr(VI) was analyzed by X-ray photoelectron spectroscopy (XPS) and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM−EDX). Meanwhile, intermediates of BPA oxidized with the aid of Cr(VI) andradical dotOH were analyzed and a possible degradation pathway was proposed. Importantly, Cr(VI)/BPA system provided a remarkable example of a “waste control by waste” strategy for the synergetic removal.