College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, People's Republic of China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, People's Republic of China.
College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, People's Republic of China.
Chemosphere. 2022 May;294:133803. doi: 10.1016/j.chemosphere.2022.133803. Epub 2022 Jan 29.
This work shows a strategy of reducing hexavalent chromium (Cr(VI)) by sodium hyposulfite (NaSO) with self-generated electricity via a dual-chamber non-biological fuel cell (D-nBFC). Therein, NaSO was electro-oxidized on graphite felt (GF) at anode and Cr(VI) in strong acidic solution was electro-reduced at GF/CCP cathode (GF decorated with conductive carbon paint (CCP)). Additionally, an agar salt bridge, consisting of saturated KCl solution, was introduced to form complete circuit by offering ions. The results showed that Cr(VI) was reduced to trivalent chromium (Cr(III)) and the D-nBFC system could produce electricity in this process. This system could obtain a high Cr(VI) removal efficiency (97.0%), 110 μA maximum current, and 13.4 mW m maximum power density in 4 h. In addition, the proposed system had high reusability after five cycles and the relative standard deviation was only 3.4% (n = 5). Thus, this D-nBFC system provides a promising and eco-friendly method for treatment of Cr(VI) pollution and generating electricity simultaneously, and also has potential application value for other heavy metals remediation.
这项工作展示了一种通过双室非生物燃料电池（D-nBFC）利用自发电还原亚硫酸氢钠（NaSO）以去除六价铬（Cr(VI)）的策略。在该策略中，亚硫酸氢钠在石墨毡（GF）阳极上发生电氧化，强酸性溶液中的六价铬在 GF/CCP 阴极（用导电碳漆（CCP）修饰的 GF）上发生电还原。此外，采用琼脂盐桥（由饱和 KCl 溶液组成）形成完整的电路，提供离子。结果表明，Cr(VI)被还原为三价铬（Cr(III)），并且在这个过程中，D-nBFC 系统可以产生电能。在 4 小时内，该系统可获得 97.0%的高 Cr(VI)去除效率、110 μA 的最大电流和 13.4 mW m 的最大功率密度。此外，该系统在经过五次循环后具有很高的可重复使用性，相对标准偏差仅为 3.4%（n = 5）。因此，该 D-nBFC 系统为同时处理 Cr(VI)污染和发电提供了一种有前途且环保的方法，并且对于其他重金属修复也具有潜在的应用价值。
