Semiconducting Polymer Interfaces for Electrochemically Assisted Mercury Remediation
Semiconducting Polymer Interfaces for Electrochemically Assisted Mercury Remediation
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DOI：
10.1021/acsami.0c15570
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发表时间：
2020-11-04
影响因子：
9.5
通讯作者：
Su, Xiao
中科院分区：
文献类型：
--
作者：
Candeago, Riccardo;Kim, Kwiyong;Su, Xiao
纳米结构的聚合物界面可以在解决水净化和高级分离的紧迫挑战方面发挥关键作用。传统的汞补救技术往往需要大量的能量投入，产生大量的二次废物，或者在电化学方面，导致很强的不可逆性。在这里，我们提出了可逆的，电化学捕获和释放汞，通过含硫的，半导体氧化还原聚合物调制界面汞沉积。采用纳米结构的聚（3-己基噻吩-2，5-二基）-碳纳米管复合电极（P3 HT-CNT/Ti）对汞进行电沉积/溶出。在电化学释放过程中，汞在非酸性电解质中被可逆地剥离，与非功能化电极相比，释放动力学高12倍。原位光学显微镜证实了P3 HT-CNT/Ti的电沉积/剥离过程的快速、可逆性质，表明氧化还原过程在介导汞相变中的关键作用。聚合物官能化系统在真实的废水基质中表现出高的汞去除效率（>97%），同时将最终的汞浓度降低到
Nanostructured polymer interfaces can play a key role in addressing urgent challenges in water purification and advanced separations. Conventional technologies for mercury remediation often necessitate large energetic inputs, produce significant secondary waste, or when electrochemical, lead to strong irreversibility. Here, we propose the reversible, electrochemical capture and release of mercury, by modulating interfacial mercury deposition through a sulfur-containing, semiconducting redox polymer. Electrodeposition/stripping of mercury was carried out with a nanostructured poly(3-hexylthiophene-2,5-diyl)-carbon nanotube composite electrode, coated on titanium (P3HT-CNT/Ti). During electrochemical release, mercury was reversibly stripped in a non-acid electrolyte with 12-fold higher release kinetics compared to nonfunctionalized electrodes. In situ optical microscopy confirmed the rapid, reversible nature of the electrodeposition/stripping process with P3HT-CNT/Ti, indicating the key role of redox processes in mediating the mercury phase transition. The polymer-functionalized system exhibited high mercury removal efficiencies (>97%) in real wastewater matrices while bringing the final mercury concentrations down to