Ultra-rapid detoxification of Sb(III) using a flow-through electro-fenton system.
Ultra-rapid detoxification of Sb(III) using a flow-through electro-fenton system.
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DOI：
10.1016/j.chemosphere.2019.125604
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发表时间：
2019-12
期刊：
影响因子：
8.8
通讯作者：
Yanbiao Liu;Jie Zhang;Fuqiang Liu;Chensi Shen;Fang Li;Manghong Huang;Bo Yang;Zhiwei Wang;
中科院分区：
文献类型：
--
作者：
Yanbiao Liu;Jie Zhang;Fuqiang Liu;Chensi Shen;Fang Li;Manghong Huang;Bo Yang;Zhiwei Wang;
近年来，锑(Sb)对环境造成的污染引起了世界各国的关注。在这里，我们使用了流通式电-Fenton系统来快速高效地解毒剧毒的Sb(III)。以FeOCl改性碳纳米管(CNT)过滤器为功能阴极，以FeOCl2+为催化剂，通过促进Fe3+/Fe2+的有效循环，促进了氧自由基点的生成。在适当的电势下，只需一次过滤即可实现Sb(III)向毒性较低的Sb(V)的超快速转化(~gt；99%在S的2倍以内)。与传统的间歇式反应器相比，由于对流强化传质，该系统表现出超快的Sb(III)解毒动力学。建议的流通式E-Fenton系统在很宽的pH范围内(例如，3-9)有效地工作。EPR技术和自由基猝灭实验表明，HO2自由基点和HO2自由基点是Sb(III)解毒的主要自由基物种。在−为0.4vs.Ag/AgCl时，当使用500gμg L−1Sb(III)掺杂的自来水时，a&>96.4%的Sb(III)转换效率仍然可以达到。用纳米氧化铁功能化的另一种特定于Sb(V)的碳纳米管过滤器可以有效地去除生成的Sb(V)。这一研究成果将最先进的电芬顿、膜分离、碳催化和纳米技术相结合，为Sb(III)和其他类似重金属离子在污染水中的解毒提供了一种有前景的策略。
Environmental pollution caused by antimony (Sb) has attracted worldwide attention recently. Here, we employed a flow-through electro-Fenton system for the rapid and efficient detoxification of highly toxic Sb(III). A FeOCl modified carbon nanotube (CNT) filter served as functional cathode, where FeOCl as nanocatalyst promoted the generation of HOradical dot by facilitating effective Fe3+/Fe2+cycling. Upon application of a proper potential, an ultra-rapid conversion of Sb(III) to less toxic Sb(V) can be achievedin situjust by a single-pass filtration (>99% within 2 s). Compared with the conventional batch reactor, the proposed system demonstrated ultra-rapid Sb(III) detoxification kinetics due to the convection-enhanced mass transport. The proposed flow-through E-Fenton system works effectively across a wide pH range (e.g.,3–9). EPR technique and radical quenching experiments indicate that HOradical dot and HO2radical dot were the dominant radical species responsible for Sb(III) detoxification. At −0.4 Vvs.Ag/AgCl, a >96.4% Sb(III) conversion efficiency still can be achieved when challenged with 500 μg L−1Sb(III)-spiked tap water. The as-produced Sb(V) can be removed effectively by another Sb(V)-specific CNT filter functionalized with nanoscale iron oxides. The outcome of this research provides a promising strategy by integrating state-of-the-art electro-Fenton, membrane separation, carboncatalysis and nanotechnology for detoxification of Sb(III) and other similar heavy metal ions in polluted water.