Li Jianfeng, Hu Jingping, Yang Changzhu, Pu Wenhong, Hou Huijie, Xu Jikun, Liu Bingchuan, Yang Jiakuan
School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST) Wuhan 430074 PR China
Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling 1037 Luoyu Road Wuhan Hubei 430074 China.
RSC Adv. 2019 Mar 15;9(15):8700-8706. doi: 10.1039/c8ra10337b. eCollection 2019 Mar 12.
As the biological recognition element of microbial fuel cell (MFC) toxicity "shock" sensors, the electrode biofilm is perceived to be the crucial issue that determines the sensing performance. A carbon felt and indium tin oxide (ITO) film anode were utilized to examine the effects of anodic biofilm microstructure on MFC toxicity sensor performance, with Pb as the target toxicant. The carbon felt anode based MFC (CF-MFC) established a linear relationship of Pb concentration ( ) voltage inhibition ratio (IR) at a range of 0.1 mg L to 1.2 mg L. The highest IR was only 38% for CF-MFC. An ITO anode based MFC (ITO-MFC) also revealed a linear relationship between and IR at of 0.1 mg L to 1.5 mg L but better sensing sensitivity compared with the CF-MFC. The IR of ITO-MFC gradually approached 100% as further increased. The enhanced sensing sensitivity for the ITO anode possibly originated from the thin biofilm that resulted in the efficient exposure of exoelectrogens to Pb. The employment of 2D conductive metal oxide with a smooth surface as the anode was able to increase the MFC sensing reliability in real wastewater.
作为微生物燃料电池（MFC）毒性“冲击”传感器的生物识别元件，电极生物膜被认为是决定传感性能的关键问题。以碳毡和氧化铟锡（ITO）薄膜作为阳极，以铅作为目标毒物，研究阳极生物膜微观结构对MFC毒性传感器性能的影响。基于碳毡阳极的MFC（CF-MFC）在0.1 mg/L至1.2 mg/L的铅浓度范围内建立了铅浓度与电压抑制率（IR）的线性关系。CF-MFC的最高IR仅为38%。基于ITO阳极的MFC（ITO-MFC）在0.1 mg/L至1.5 mg/L的铅浓度范围内也显示出铅浓度与IR之间的线性关系，但与CF-MFC相比具有更好的传感灵敏度。随着铅浓度进一步增加，ITO-MFC的IR逐渐接近100%。ITO阳极传感灵敏度的提高可能源于较薄的生物膜，这使得产电微生物能够有效地暴露于铅。采用表面光滑的二维导电金属氧化物作为阳极能够提高MFC在实际废水中的传感可靠性。
