石墨烯/聚苯胺修饰阴极对反硝化MFC性能影响  

Effect of graphene/polyaniline composite modified cathode on performance of MFC with denitrification biocathode

作　　者：赵婷 钱子牛 易越[1] 谢倍珍[1] 刘红[1] ZHAO Ting;QIAN Zi-niu;YI Yue;XIE Bei-zhen;LIU Hong(Institute of Environmental Biology and Life Support Technology,School of Biological Science and Medical Engineering,Beihang University,Beijing 100083,China)

机构地区：[1]北京航空航天大学生物与医学工程学院,环境生物学与生命保障技术研究所,北京100083

出　　处：《中国环境科学》2020年第12期5290-5298,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(31770135)。

摘　　要：反硝化生物阴极微生物燃料电池(MFC)以电极为电子供体,在自养条件下完成硝酸盐去除过程.本研究以碳布(CC)为基底材料,分别制备获得还原氧化石墨烯修饰(rGO-CC),聚苯胺修饰(PANI-CC)及二者复合修饰的CC电极(rGO/PANI-CC),并考察其作为阴极材料对反硝化生物阴极MFC产电脱氮性能的影响.扫描电镜结果显示,rGO-CC和PANI-CC的碳纤维分别被片层状rGO和网状PANI覆盖,而rGO/PANI-CC表面呈现PANI在附着rGO的碳纤维上团聚的形貌,均增大了碳布的比表面积.循环伏安测试显示,rGO/PANI-CC具有最高的电化学活性.以rGO-CC,PANI-CC和rGO/PANI-CC为阴极构建MFC的产电能力分别提高了82%,24%和41%,其阴极对NO3--N的去除能力增强了23%,9%和13%.16S rDNA测序结果揭示修饰后电极表面微生物的多样性下降,Stappia和Pacacoccus属微生物的丰度增加.In denitrifying microbial fuel cells(MFCs),the biocathode is the electron donor and nitrate is removed in autotrophic conditions.Reduced graphene oxide modified carbon cloth(rGO-CC),polyaniline modified CC(PANI-CC),and rGO/PANI composite modified CC(rGO/PANI-CC)were prepared,and the electricity and the denitrification performances of MFCs with modified CC as cathodes were evaluated.Scanning electron microscopy analysis revealed that the carbon fibers of rGO-CC and PANI-CC were covered by lamellar rGO and reticular PANI,respectively,while PANI agglomerated on the rGO-covered carbon fibers for rGO/PANI-CC;both of which increased the specific surface area of CC.Cyclic voltammetry tests showed the rGO/PANI-CC had the highest electrochemical activity.The electricity performances of MFCs with rGO-CC,PANI-CC and rGO/PANI-CC as cathodes were improved by 82%,24%and 41%,and the cathodic denitrification rates were enhanced by 23%,9%and 13%,respectively.The 16S rDNA sequencing results demonstrated the α-diversity index of electrode-attached microorganisms on modified CC decreased,and the relative abundances of Stappia and Pacacoccus increased.

关 键 词：微生物燃料电池 生物阴极 反硝化 石墨烯 聚苯胺 

分 类 号：X703.5[环境科学与工程—环境工程]