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

Biao Li, Jia-Dong Sun, Chen Tang, Jun Zhou, Xia-Yuan Wu, Hong-Hua Jia, Ping Wei, Yifeng Zhang, Xiao-Yu Yong*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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 μm), higher biomass (8.67 mg/cm2) 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.
Original languageEnglish
Article number116589
JournalWater Research
Volume189
Number of pages11
ISSN0043-1354
DOIs
Publication statusPublished - 2021

Keywords

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

Fingerprint Dive into the research topics of 'Coordinated response of Au-NPs/rGO modified electroactive biofilms under phenolic compounds shock: Comprehensive analysis from architecture, composition, and activity'. Together they form a unique fingerprint.

Cite this