Extracellular electron transfer leading to the biological mediated production of reduced graphene oxide
Extracellular electron transfer leading to the biological mediated production of reduced graphene oxide
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细胞外电子转移导致生物介导的还原氧化石墨烯的生产
DOI：
10.1016/j.chemosphere.2020.127141
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发表时间：
2020-10-01
期刊：
影响因子：
8.8
通讯作者：
Fan, Changzheng
中科院分区：
文献类型：
--
作者：
Lu, Yue;Zhong, Linrui;Fan, Changzheng
为探索一种绿色、低成本、高效的还原氧化石墨烯（RGO）的合成方法，研究了一种电化学活性模式菌（EAB）--硫还原石墨烯菌（Gesulfurreducens PCA）对氧化石墨烯（GO）的还原过程和机理。在这项工作中，高达1.0 mg mL（-1）的GO被G。0.5-8天内发生硫还原。还原产物中的I-D/I-G比值与化学RGO相似。微生物还原后，对应于氧化石墨烯（001）反射的峰消失，而另一个被认为是石墨间距（002）的峰出现。与初始GO相比，细菌诱导的RGO中典型的氧官能团（如羧基C-O和>O（环氧化物）基团）的峰强度减小。此外，我们还观察到了细菌诱导的RGO中氮、磷元素的掺杂。与此一致，GO还原后观察到更好的电化学性能。差示脉冲伏安法（DPV）和循环伏安法（CV）分析证实，细菌诱导的RGO的峰电流的最大值显着高于GO。结果表明，微生物细胞/GO界面的电子转移促进了GO的还原，表明EAB在生物介导的RGO生产中具有更广泛的应用。(C)2020爱思唯尔有限公司保留所有权利。
To explore a green, low-cost, and efficient strategy to synthesis reduced graphene oxide (RGO), the process and mechanism of the graphene oxide (GO) reduction by a model electrochemically active bacteria (EAB), Geobacter sulfurreducens PCA, were studied. In this work, up to 1.0 mg mL(-1) of GO was reduced by G. sulfurreducens within 0.5-8 days. I-D/I-G ratio in reduced product was similar to chemically RGO. After microbial reduction, the peak which corresponded to the reflection of graphene oxide (001) disappeared, while another peak considered as graphite spacing (002) appeared. The peak intensity of typical oxygen function groups, such as carboxyl C-O and >O (epoxide) groups, diminished in bacterially induced RGO comparing to initial GO. Besides, we observed the doping of nitrogen and phosphorus elements in bacterially induced RGO. In a good agreement with that, better electrochemical performance was noticed after GO reduction. As confirmed with differential pulse voltammetry (DPV) and cyclic voltammetry (CV) analysis, the maximum value of peak currents of bacterially induced RGO were significantly higher than those of GO. Our results showed the electron transfer at microbial cell/GO interface promoted the GO reduction, suggesting a broader application of EAB in biological mediated production of RGO. (C) 2020 Elsevier Ltd. All rights reserved.