Zhou Linglin, Liu Li, Qiao Wenyan, Gao Yikui, Zhao Zhihao, Liu Di, Bian Zhenfeng, Wang Jie, Wang Zhong Lin
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China.
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China.
ACS Nano. 2021 Dec 28;15(12):19684-19691. doi: 10.1021/acsnano.1c06988. Epub 2021 Dec 3.
Although electrocoagulation technology has been widely researched in wastewater treatment, high energy consumption and electrode passivation are still the main challenges for its widespread applications. Here, we propose a self-powered electrocoagulation system based on a triboelectric nanogenerator (TENG) with alternating current (AC) outputs to solve these two issues, and thus enhance the removal efficiency of organic pollutants. Compared with the direct current source, the AC power source can reduce the electrode passivation, produce more aluminum hydroxide compounds after consuming an equal amount of charges, and thus improve the degradation efficiency. Moreover, the removal efficiency can be further enhanced by decreasing the frequency AC, in which a 5.7-fold improvement was achieved at 0.2 Hz compared to DC at 1.8 Hz. Inspired by the low frequency of ocean wave water, we developed a self-powered AC-electrocoagulation system to directly drive the electrocoagulation reaction by harvesting water wave energy, which can effectively remove 94.8% of xylenol orange and 98.8% of water-oil emulsion, and thus completely address the problem of energy consumption. This study further promotes the application of self-powered electrochemical systems in treating environmental pollution.
尽管电凝技术在废水处理方面已得到广泛研究，但高能耗和电极钝化仍是其广泛应用的主要挑战。在此，我们提出一种基于具有交流（AC）输出的摩擦纳米发电机（TENG）的自供电电凝系统，以解决这两个问题，从而提高有机污染物的去除效率。与直流电源相比，交流电源可减少电极钝化，在消耗等量电荷后产生更多氢氧化铝化合物，进而提高降解效率。此外，通过降低交流频率可进一步提高去除效率，其中在0.2 Hz时与1.8 Hz的直流相比提高了5.7倍。受海浪低频的启发，我们开发了一种自供电交流电凝系统，通过收集水波能量直接驱动电凝反应，该系统可有效去除94.8%的二甲酚橙和98.8%的水 - 油乳液，从而彻底解决能耗问题。本研究进一步推动了自供电电化学系统在环境污染治理中的应用。
