Geobacter sulfurreducens promoted the biosynthesis of reduced graphene oxide and coupled it for nitrobenzene reduction  

作　　者：Shoujuan Zhang Qi Liu Linrui Zhong Jianhong Jiang Xiaozhe Luo Xingxin Hu Qian Liu Yue Lu 

机构地区：[1]College of Environmental Science and Engineering,Hunan University,Changsha 410082,China [2]Shenzhen Research Institute,Hunan University,Shenzhen 510082,China [3]Key Laboratory of Environment Biology and Pollution Control,Hunan University,Ministry of Education,Changsha 410082,China [4]China Machinery International Engineering Design&Research Institute Co.,Ltd,Changsha 410007,China [5]Hunan Engineering Research Center for Water Treatment Process&Equipment,Changsha 410007,China

出　　处：《Journal of Environmental Sciences》2024年第4期458-469,共12页环境科学学报（英文版）

基　　金：supported by the Science and Technology Innovation Program of Hunan Province(No.2022RC1026);Shenzhen Science and Technology Program(No.JCYJ20220530160412027);Guangdong Basic and Applied Basic Research Foundation(No.2023A1515011807);the Project of the National Key Research and Development Program of China(No.2021YFC1910400);the Technical Innovation Leading Plan Project for Hunan High-tech Industry(Nos.2020SK2042 and 2022GK4062);the Key R&D Project of Hunan Province of China(No.2022SK2067)。

摘　　要：In order to explore an efficient and green method to deal with nitrobenzene(NB)pollutant,reduced graphene oxide(r GO)as an electron shuttle was applied to enhance the extracellular electron transfer(EET)process of Geobacter sulfurreducens,which was a typical electrochemically active bacteria(EAB).In this study,r GO biosynthesis was achieved via the reduction of graphene oxide(GO)by G.sulfurreducens PCA within 3 days.Also,the r GOPCA combining system completely reduced 50-200μmol/L of NB to aniline as end product within one day.SEM characterization revealed that PCA cells were partly wrapped by rGO,and therefore the distance of electron transfer between strain PCA and r GO material was reduced.Beside,the ID/IGof GO,r GO,and r GO-PCA combining system were 0.990,1.293 and 1.31,respectively.Moreover,highest currents were observed in r GO-PCA-NB as 12.950μA/-12.560μA at -408 m V/156 m V,attributing to the faster electron transfer efficiency in EET process.Therefore,the NB reduction was mainly due to:(I)direct EET process from G.sulfurreducens PCA to NB;(II)r GO served as electron shuttle and accelerated electron transfer to NB,which was the main degradation pathway.Overall,the biosynthesis of r GO via GO reduction by Geobacter promoted the NB removal process,which provided a facile strategy to alleviate the problematic nitroaromatic pollution in the environment.

关 键 词：Reduced graphene oxide GEOBACTER NITROBENZENE REMOVAL Extracellular electron transfer 

分 类 号：X505[环境科学与工程—环境工程] X172