Simultaneous Cr(VI) removal and bisphenol A degradation in a solar-driven photocatalytic fuel cell with dopamine modified carbon felt cathode
Simultaneous Cr(VI) removal and bisphenol A degradation in a solar-driven photocatalytic fuel cell with dopamine modified carbon felt cathode
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采用多巴胺改性碳毡阴极的太阳能驱动光催化燃料电池同时去除 Cr(VI) 和降解双酚 A
DOI：
10.1016/j.apsusc.2018.12.079
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发表时间：
2019-03
影响因子：
6.7
通讯作者：
Xu Zhao
中科院分区：
文献类型：
--
作者：
Ke Xiao;Jing He;Juanjuan Zhang;Bo Yang;Xu Zhao
在这项工作中，探索了多巴胺修饰的碳毡阴极（DPA/CF），以增强两室光电化学系统中 Cr(VI) 的阴极还原，该系统由 BiVO4 光阳极的太阳光照射驱动。在阳极室中，通过将pH值提高到8可以显着改善双酚A（BPA）的分解。通过应用DPA/CF阴极，BiVO4表面光生的电子-空穴对被有效分离。在最佳条件下，60分钟内可去除86%的低浓度BPA。在阴极室中，pH 为 4 时，80% 的 Cr(VI) 被去除。基于 XPS 和电化学分析，提出 DPA/CF 阴极上的带正电基团导致 Cr(VI) 阴离子的多层吸附，从而通过 BiVO4 上产生的电子增强了 Cr(VI) 的还原。另一方面，DPA/CF 电极上的 C 单键 O 基团也作为 Cr(VI) 还原的电子转移介体发挥了重要作用。制备的 DPA/CF 阴极与 BiVO4 光阳极结合可能成为在太阳光刺激下有效去除 Cr(VI) 和有机污染物的潜在应用。
In this work, a carbon felt cathode modified by dopamine (DPA/CF) was explored to enhance the cathodic reduction of Cr(VI) in a two chambers photoelectrochemical system, which was driven by solar light irradiation using BiVO4photoanode. In the anode chamber, the bisphenol A (BPA) decomposition can be significantly improved by increasing pH to 8. The electron-hole pairs photogenerated on the surface of BiVO4were efficiently separated by the application of the DPA/CF cathode. At the optimal conditions, 86% of low-concentration BPA was removed within 60 min. In the cathodic chamber, 80% of Cr(VI) was removed at pH of 4. Based on the XPS and electrochemical analyses, it was proposed that the positively-charged groups on the DPA/CF cathode led to the multilayer adsorption of Cr(VI) anions, which enhanced the reduction of Cr(VI) with the electrons generated on the BiVO4. On the other hand, the Csingle bondO groups on the DPA/CF electrode also played an important role as electron transfer mediator for Cr(VI) reduction. The prepared DPA/CF cathode associated with BiVO4photoanode could be a potential application for efficient removal of Cr(VI) and organic pollutants under solar light irritation.
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