Enhancing the extracellular electron transfer ability via Polydopamine@S. oneidensis MR-1 for Cr(VI) reduction

Boyu Jia; Tianbao Liu; Juanjuan Wan; Andrei Ivanets; Yujia Xiang; Lijuan Zhang; Xintai Su

doi:10.1016/j.envres.2022.114914

Enhancing the extracellular electron transfer ability via Polydopamine@S. oneidensis MR-1 for Cr(VI) reduction

Environ Res. 2023 Jan 15:217:114914. doi: 10.1016/j.envres.2022.114914. Epub 2022 Nov 23.

Authors

Boyu Jia¹, Tianbao Liu¹, Juanjuan Wan¹, Andrei Ivanets², Yujia Xiang¹, Lijuan Zhang³, Xintai Su¹

Affiliations

¹ School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China.
² Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus, Surganova St., 9/1, 220072, Minsk, Belarus.
³ School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China; SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou, 510006, China; School of Environment, South China Normal University, University Town, Guangzhou, 510006, China. Electronic address: zhanglj112@163.com.

PMID: 36427635
DOI: 10.1016/j.envres.2022.114914

Abstract

Microbial reduction of hexavalent chromium (Cr (VI)) shows better efficiency and cost-effectiveness. However, immobilization of Cr (III) remains a challenge as there is a limited supply of electron donors. A greener and cleaner option for donating external electrons was using bioelectrochemical systems to perform the microbial reduction of Cr(VI). In this system, we constructed a polydopamine (PDA) decorated Shewanella oneidensis MR-1 (S. oneidensis MR-1) bioelectrode with bidirectional electron transport, abbreviated as PDA@S. oneidensis MR-1. The conjugated PDA distributed on the intracellular and extracellular of individual S. oneidensis MR-1 has been shown to accelerate electron transfer by outer membrane C-type cytochromes and flavin-bound MtrC/OmcA pathway by various electrochemical analyses. As expected, the PDA@S. oneidensis MR-1 biofilm achieved 88.1% Cr (VI) removal efficiency (RE) and 58.1% Cr (III) immobilization efficiency (IE) within 24 h under the autotrophic conditions at the optimal voltage (-150 mV) compared with the control potential (0 mV). The PDA@S. oneidensis MR-1 biofilm showed increased RE activity was attributed to the shortening of the distance between individual bacteria by PDA. This research provides a viable strategy for in situ bioremediation of Cr(VI) polluted aquatic environment.

Keywords: Bidirectional electron transport; Bioelectrochemical system; Chromate remediation; Outer membrane C-Type cytochromes; Polydopamine; S. oneidensis MR-1.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Electron Transport
Electrons*
Oxidation-Reduction
Shewanella* / metabolism

Substances

chromium hexavalent ion
polydopamine

Supplementary concepts

Shewanella oneidensis