Wirelesselectrocoagulation in water treatment based on bipolar electrochemistry
Wirelesselectrocoagulation in water treatment based on bipolar electrochemistry
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基于双极电化学的无线电凝聚水处理
DOI：
10.1016/j.electacta.2017.01.151
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发表时间：
2017
影响因子：
6.6
通讯作者：
Ren Nanqi
中科院分区：
文献类型：
--
作者：
Qi Zhenlian;You Shijie;Ren Nanqi
本文报道了一种基于双极电化学的无线电凝法，以铁片为牺牲双极电极，石墨板为驱动电极。在电场诱导的界面电位差的驱动下，铁的溶解从阳极开始，生成铁混凝剂，从而达到除浊的目的。产生的总铁浓度被认为是更多地依赖于BPE的几何构型，而不是电化学参数。也就是说，平行于电场放置BPE的长度可以产生比垂直放置时高84.6%的铁浓度。此外，将BPE的数量从1个增加到3个导致混凝剂产量增加2.1倍。此外，为了最大化电压降并最小化所使用的材料，BPE被设计成不同的几何形状。即使相对阴极/阳极表面积低至0.36，“H形”BPE也可以实现与未改性BPE几乎相同的铁浓度。这通过节省高达40%的电极材料和成本来实现高效的混凝剂生产。无线操作不仅可以解决由电极连接引起的问题，而且可以允许任意数量的牺牲BPE在非常简单的设置中同时工作。此外，可以通过BPE的几何构型容易地控制WEC性能。所有这些因素将使电凝聚法在水处理中更容易，更经济，更可靠。
The present study reports the wireless electrocoagulation (WEC) based on bipolar electrochemistry where the iron sheets were used as sacrificial bipolar electrodes (BPEs) and two graphite plates served as driving electrodes. Driven by the interfacial potential difference induced by electric field in solution, the iron dissolution started at the anodic pole, achieving the generation of iron coagulant and thus turbidity removal. The total iron concentration produced was found to be more dependent on the geometrical configuration of BPE rather than electrochemical parameters. That is, placing the BPE with the length in parallel to electric field could generate iron concentration of 84.6% higher than that when placed vertically. Besides, increasing the number of BPE from one to three led to the increase in coagulant production by 2.1 times. Moreover, to maximize the voltage drop and minimize the material used, the BPE was designed into different geometrical shapes. The “H-shaped” BPE could achieve almost the same iron concentration as the unmodified BPE even the relative cathode/anode surface area was as low as 0.36. This accounted for efficient coagulant production by saving as great as 40% of the electrode material and cost. The wireless operation can not only solve the problems caused by electrode connection, but also allow arbitrary number of sacrificial BPEs working simultaneously in a very simple setup. In addition, the WEC performance can be easily controlled by the geometrical configuration of BPE. All these factors will be expected to make the electrocoagulation process much easier, more economical and more reliable in water treatment.