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Nano-hydroxyapatite/carbon nanotube: An excellent anode modifying material for improving the power output and diclofenac sodium removal of microbial fuel cells.

Authors :
Guo, Wei
Chen, Yingying
Cui, Liang
Xu, Na
Wang, Mengmeng
Sun, Yahui
Yan, Yunhui
Source :
Bioelectrochemistry. Dec2023, Vol. 154, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

• Biocompatible and positively charged nanohydroxyapatite combined with carbon nanotube was used as anode modified material. • nHA/CNTs formed reticular porous structure and exhibited improved bacteria adsorption ability and electrochemical activity. • nHA/CNTs/CB anode facilitated the extracellular electron transfer and realized low electron transfer resistance. • nHA/CNTs modification promoted the anodic biofilm formation. • nHA/CNTs favored the enrichment of electroactive bacteria and dechlorinating bacteria during 322 days of operation. Anode material and surface properties have a crucial impact on the performance of MFCs. Designing and fabricating various modified carbon-based anodes with functional materials is an effective strategy to improve anode performance in MFCs. Anode materials with excellent bioaffinity can promote bacterial attachment, growth, and extracellular electron transfer. In this study, positively charged nano hydroxyapatite (nHA) with remarkable biocompatibility combined with carbon nanotubes (CNTs) with unique structure and high conductivity were used as anode modifying material. The nHA/CNTs modified carbon brush (CB) exhibited improved bacteria adsorption capacity, electrochemical activity and reticular porous structure, thus providing abundant sites and biocompatible microenvironment for the attachment and growth of functional microbial and accelerating extracellular electron transfer. Consequently, the nHA/CNTs/CB-MFCs achieved the maximum power density of 4.50 ± 0.23 mW m−2, which was 1.93 times higher than that of the CB-MFCs. Furthermore, diclofenac sodium (DS), which is a widely used anti-inflammatory drug and is also a persistent toxic organic pollutant constituting a serious threat to public health, was used as the model organic pollutant. After 322 days of long-term operation, enhanced diclofenac sodium removal efficiency and simultaneous bioelectricity generation were realized in nHA/CNTs/CB-MFCs, benefiting from the mature biofilm and the diverse functional microorganisms revealed by microbial community analysis. The nHA/CNTs/CB anode with outstanding bioaffinity, electrochemical activity and porous structure presents great potential for the fabrication of high-performance anodes in MFCs. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
15675394
Volume :
154
Database :
Academic Search Index
Journal :
Bioelectrochemistry
Publication Type :
Academic Journal
Accession number :
171901800
Full Text :
https://doi.org/10.1016/j.bioelechem.2023.108523