阳极微生物还原氧化石墨烯促进微生物燃料电池在米粉废水中的能量回收  

Harvesting energy from Rice-flour wastewater treatment by microbial fuel cell: role of Bio-reduced graphene oxide as the anode material

作　　者：王凯 邹定辉 王冠雯 黄海澜 冯春华 WANG Kai;ZOU Dinghui;WANG Guanwen;HUANG Hailan;FENG Chunhua(College of Environment And Energy, South China University of Technology, Guangzhou, 510006, China;The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, China)

机构地区：[1]华南理工大学环境与能源学院,广州510006 [2]工业聚集区污染控制与生态修复教育部重点实验室,广州510006

出　　处：《环境化学》2017年第11期2479-2487,共9页Environmental Chemistry

基　　金：国家自然科学基金(51378216)资助~~

摘　　要：米粉废水是一种含有高浓度有机质的工农业产物.本文以氧化石墨烯(GO)修饰石墨刷作为微生物燃料电池(microbial fuel cell,MFC)阳极实现米粉废水的产电以及能量回收.当米粉废水的COD浓度为1200 mg·L^(-1)时,MFC的最大功率密度可达1273.89 m W·m^(-2),此时从废水中回收的能量高达0.97 k Wh·kg^(-1)-COD,其远高于目前文献报道值,例如,MFC体系下市政废水中回收的能量仅为0.18 k Wh·kg^(-1)-COD.利用扫描电子显微镜(scanning electron microscopy,SEM)和激光共聚焦(confocal laser scanning microscopy,CLSM)观测电极表面形貌,傅里叶变换红外光谱仪(fourier transform infrared,FTIR)以及拉曼光谱(raman)测定阳极电极的化学结构,循环伏安曲线(cyclic voltammetry,CV)以及电化学阻抗图谱(electrochemical impedance spectra,EIS)测定反映电极电化学性能,结果表明:阳极表面GO负载量随GO修饰浓度的增加而增加;当混合产电菌驯化6个月后,石墨刷表面GO被还原为r GO;与以空白石墨刷为阳极构建的MFC相比,GO修饰石墨刷构建的MFC具有更好的电容特性且传质电阻更低,从而可回收更高的能量.Rice-flour wastewater released from industrial and agricultural production usually contains high-concentration organic compounds. Here,a microbial fuel cell（ MFC） with graphere oxide（ GO）-modified graphite brush as the anode material was employed to achieve electricity generation and energy recovery from the rice-flour wastewater. The MFC exhibited a maximum power density（ 1273.89 mW·m^-2） when the COD concentration of rice-flour wastewater was 1200 mg·L^-1.Meanwhile,energy as high as 0.97 kWh·kg^-1-COD was recovered from the wastewater,which was much more efficient compared to the energy（ 0. 18 kWh·kg^-1-COD） recovered from municipal wastewater as shown previously. The scanning electron microscopy（ SEM） and confocal laser scanning microscopy（ CLSM） tests were utilized to observe bacteria morphology on the surface of electrode; the Fourier transform infrared spectroscopy（ FTIR） and Raman spectra measurements were employed to investigate the structure of anode materials; and the cyclic voltammetry（ CV） and electrochemical impedance spectra（ EIS） tests were used to probe electrochemical information. It was shown that the loadings of GO on the anode increased with the increase in the concentration of GO used for anode modification. After acclimation of anode for six months,GO on the surface of graphite brush was successfully reduced. In comparison with the control MFC reactor assembled with the bare graphite brush anode,GO-modified anode exhibited superior capacitive property and lower charge transfer resistance, which contributed to higher performance of MFC and more energy recovery.

关 键 词：微生物燃料电池 氧化石墨烯 米粉废水 能量回收 

分 类 号：TM911.45[电气工程—电力电子与电力传动]