4.8 Article

Coordinated response of Au-NPs/rGO modified electroactive biofilms under phenolic compounds shock: Comprehensive analysis from architecture, composition, and activity

期刊

WATER RESEARCH
卷 189, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2020.116589

关键词

Electroactive biofilms (EABs); Phenolic compounds shock; Au-NPs/rGO; Extracellular electron transfer (EET); Extracellular polymeric substances (EPS)

资金

  1. Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture
  2. National Key Research and Development Program of China [2019YFC1906602]
  3. Key Research and Development Technology of Shanxi [201903D211013]
  4. Key Research and Development Technology of Ningxia Hui Autonomous Region [2019BFH02008]
  5. National Natural Science Foundation of China [21777069]
  6. CAS Key Laboratory of Environmental and Applied Microbiology & Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences [KLCAS-2019-3]

向作者/读者索取更多资源

Nanocatalyst-decorated EABs showed significantly enhanced power density under different environmental stresses, leading to differential alterations in their structure, composition, and viability. EABs with higher maturity exhibited better antishock ability and actively responded to strike a balance between self-protection and extracellular electron transfer under environmental pressure. These findings contribute to a broader understanding of microbe-electrode interactions and enhance their performance in sustainable remediation and new-energy development.
Electroactive biofilms (EABs) can be integrated with conductive nanomaterials to boost extracellular electron transfer (EET) for achieving efficient waste treatment and energy conversion in bioelectrochemical systems. However, the in situ nanomaterial-modified EABs of mixed-culture, and their response under environmental stress are rarely revealed. Here, two nanocatalyst-decorated EABs were established by self-assembled Au nanoparticles-reduced graphene oxide (Au-NPs/rGO) in mixed-biofilms with different maturities, then their multi-property were analyzed under long-term phenolic shock. Results showed that the power density of Au-NPs/rGO decorated EABs was significantly enhanced by 28.66-42.82% due to the intensified EET pathways inside biofilms. Meanwhile, the electrochemical and catalytic performance of EABs were controllably regulated by 0.3-3.0 g/L phenolic compounds, which, however, resulted in differential alterations in their architecture, composition, and viability. EABs originated with higher maturity displayed more compact structure, lower thickness (110 mu m), higher biomass (8.67 mg/cm(2)) and viability (0.85-0.91), endowing it better antishock ability to phenolic compounds. Phenolic-shock also induced the heterogeneous distribution of extracellular polymeric substances in terms of both spatial and bonding degrees of the decorated EABs, which could be regarded as an active response to strike a balance between self-protection and EET under environmental pressure. Our findings provide a broader understanding of microbe-electrode interactions in the micro-ecology interface and improve their performance in the removal of complex contaminants for sustainable remediation and new-energy development. (C) 2020 Elsevier Ltd. All rights reserved.

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