School of Water Resources, Indian Institute of Technology, Kharagpur 721302, India.
Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India.
Bioresour Technol. 2015 Sep;191:110-6. doi: 10.1016/j.biortech.2015.04.109. Epub 2015 May 4.
Catalytic effect of goethite recovered from iron-ore mining mud was studied in microbial fuel cells (MFCs). Characterization of material recovered from mining mud confirms the recovery of iron oxide as goethite. Heat treated goethite (550 °C) and untreated raw goethite were coated on stainless-steel anode of MFC-1 and MFC-2, respectively; whereas, unmodified stainless-steel anode was used in MFC-3 (control). Fivefold increment in power was obtained in MFC-1 (17.1 W/m(3) at 20 Ω) than MFC-3 (3.5 W/m(3)). MFC with raw goethite coated anode also showed enhanced power (11 W/m(3)). Higher Coulombic efficiency (34%) was achieved in MFC-1 than control MFC-3 (13%). Decrease in mass-transport losses and higher redox current during electrochemical analyses support improved electron transfer with the use of goethite on anode. Cheaper goethite coating kinetically accelerates the electron transfer between bacteria and anode, proving to be a novel approach for enhancing the electricity generation along with organic matter removal in MFC.
从铁矿采矿泥浆中回收的针铁矿在微生物燃料电池 (MFC) 中的催化作用进行了研究。从泥浆中回收的材料的特性证实了氧化铁作为针铁矿的回收。热处理的针铁矿（550°C）和未处理的原始针铁矿分别涂覆在 MFC-1 和 MFC-2 的不锈钢阳极上；而未修饰的不锈钢阳极则用于 MFC-3（对照）。与 MFC-3（3.5 W/m3）相比，MFC-1（在 20 Ω 时为 17.1 W/m3）的功率增加了五倍。涂覆有原始针铁矿的阳极的 MFC 也显示出增强的功率（11 W/m3）。与对照 MFC-3（13%）相比，MFC-1 的库仑效率（34%）更高。电化学分析中质量传输损失的降低和更高的氧化还原电流支持了在阳极上使用针铁矿改善电子转移。更便宜的针铁矿涂层在动力学上加速了细菌和阳极之间的电子转移，这被证明是一种在 MFC 中增强发电和去除有机物的新方法。
