School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Road, Shanghai, 200444, China.
Shaoxing Environmental Industry co., LTD, Intersection of Yuedong Road and Qunxian Road, Yuecheng District, Shaoxing, Zhejiang, 312000, China.
Environ Sci Pollut Res Int. 2019 Jul;26(19):19540-19548. doi: 10.1007/s11356-019-05291-y. Epub 2019 May 10.
Ferrous chelates (FeEDTA) can effectively absorb NO, but the regeneration of them usually consumes large amounts of organic matter or energy. In this study, a new approach to regenerate NO absorbed ferrous chelates with simultaneous electricity generation was investigated by a microbial fuel cell (MFC). The performance and mechanisms of FeEDTA regeneration were evaluated in the cathode of MFC reactor with and without the presence of microorganisms (referring to biocathode and abiotic cathode), respectively. It was found that FeEDTA-NO and FeEDTA could be used as the cathode electron acceptors in MFC. Low pH (pH = 5) was beneficial to electricity generation and FeEDTA/FeEDTA-NO reduction by the abiotic cathode. The biocathode performed better in electricity generation and FeEDTA regeneration, and achieved a FeEDTA reducing rate of 0.34 h and a FeEDTA-NO reducing rate of 0.97 L mmol h, which are much higher that than those for the abiotic cathode (0.23 h for FeEDTA, 0.44 L mmol h for FeEDTA-NO). This was likely because the activation polarization loss and over cathode potential were reduced as a result of the catalytic activity of NO and iron reducing bacteria.
亚铁螯合物（FeEDTA）可以有效地吸收 NO，但它们的再生通常需要消耗大量的有机物或能量。在这项研究中，通过微生物燃料电池（MFC）研究了一种用同时发电来再生吸收的亚铁螯合物 NO 的新方法。分别在有和没有微生物存在的情况下（分别称为生物阴极和非生物阴极）评估了 MFC 反应器中阴极的 FeEDTA 再生性能和机制。结果表明，FeEDTA-NO 和 FeEDTA 可以作为 MFC 中的阴极电子受体。低 pH 值（pH = 5）有利于非生物阴极的发电和 FeEDTA/FeEDTA-NO 还原。生物阴极在发电和 FeEDTA 再生方面表现更好，FeEDTA 的还原率为 0.34 h，FeEDTA-NO 的还原率为 0.97 L mmol h，明显高于非生物阴极（FeEDTA 的还原率为 0.23 h，FeEDTA-NO 的还原率为 0.44 L mmol h）。这可能是因为 NO 和铁还原菌的催化活性降低了活化极化损失和过阴极电位。
