Deciphering of electron transfer and microbial community of electrogenic oxygen reducing biofilms to sulfamethoxazole stress.
Qing Jiang, Xing Dong, Yang Liu, Xiaoyu Zhou +5
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75% confidenceThis study investigates the effects of sulfamethoxazole on oxygen-reducing biofilms in microbial fuel cells, revealing a dual role of SMX in modulating biofilm composition and function.
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Abstract
This study first evaluated the sulfamethoxazole (SMX) effects on oxygen-reducing biocathodes in microbial fuel cells (MFCs). Low SMX (0.5 mg L -1 ) enhanced current density by 20 % via increased direct electron transfer and lower charge transfer resistance. High SMX (10-30 mg L -1 ) suppressed electrochemical performance. SMX preferentially bound protein-like EPS components over fulvic-like fractions, inducing sequential structural changes (1054 > 970 > 3464 > 2921 > 1643 > 1350 cm -1 ). SMX exposure reshaped microbial communities, enriching antibiotic-resistant genera (Truepera, Nitrospira, Brevundimonas, etc.). Network analysis revealed low SMX enhanced community complexity/stability, while high doses simplified biofilm structure. Functional genes for electron transfer, carbon metabolism and oxidative phosphorylation increased at 0.5 mg L -1 SMX but decreased under high concentrations. Overall, this study elucidates the dual role of SMX in modulating oxygen-reducing biofilm composition, function, and capability, laying the groundwork for optimized application of MFC in treating SMX-contaminated wastewater.
Keywords
Identifiers
- PubMed
- 40306339
- Journal
- Bioresource technology
- Year
- 2025