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.

中文翻译：

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基于双极电化学的水处理无线电凝

本研究报告了基于双极电化学的无线电凝（WEC），其中铁片用作牺牲双极电极（BPE），两个石墨板用作驱动电极。在溶液中电场引起的界面电位差的驱动下，铁的溶解从阳极开始，实现了铁凝结剂的产生，从而去除了浊度。发现产生的总铁浓度更多地取决于BPE的几何构型而不是电化学参数。也就是说，将BPE的长度与电场平行放置会比垂直放置的铁浓度高84.6％。此外，将BPE的数量从一增加到三导致凝结剂产量增加了2.1倍。而且，为了最大程度地降低电压并最大程度地减少使用的材料，BPE被设计成不同的几何形状。“ H形” BPE可以达到与未改性BPE几乎相同的铁浓度，即使阴极/阳极的相对表面积低至0.36。通过节省多达40％的电极材料和成本，这可以有效地生产凝结剂。无线操作不仅可以解决由电极连接引起的问题，而且还允许以非常简单的设置同时工作任意数量的牺牲BPE。此外，可以通过BPE的几何构造轻松控制WEC性能。所有这些因素将使电凝过程在水处理中变得更加容易，更经济和更可靠。