Antimony reduction by a non-conventional sulfate reducer with simultaneous bioenergy production in microbial fuel cells
| Autor: | Weimin Sun, Tangfu Xiao, Hongguo Zhang, Chen Zhenxin, Jia Yan, Samuel Raj Babu Arulmani, Junxi Dai, Sabariswaran Kandasamy, Han Li |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Antimony
Environmental Engineering Microbial fuel cell Sulfide Bioelectric Energy Sources Health Toxicology and Mutagenesis chemistry.chemical_element chemistry.chemical_compound Electricity Humans Environmental Chemistry Sulfate-reducing bacteria Sulfate Electrodes Ecosystem chemistry.chemical_classification Sulfates Precipitation (chemistry) Public Health Environmental and Occupational Health General Medicine General Chemistry Pollution Dielectric spectroscopy chemistry Stibnite Nuclear chemistry |
| Zdroj: | Chemosphere. 291:132754 |
| ISSN: | 0045-6535 |
| Popis: | Environmental toxicity of antimony (Sb) is significantly increased through the widespread industrial application. The extended release of Sb above the regulatory level became a risk to humans habituated in the ecosystem. Conventional methods to remediate Sb demand high energy or resource input, which further leads to secondary pollution. The bio-electrochemical system offers a promising bioremediation strategy to remove or reduce toxic heavy metals. Thus, this research explores the possibilities of simultaneous metal sulfide (MeS) precipitation and electricity production using a full biological Microbial fuel cell (MFC). A non-conventional sulfate-reducing bacteria (SRB) Citrobacter freundii SR10 was used for this investigation, where the MFC was operated for lactate utilization in the bio-anode and Sb reduction at the bio-cathode. This study observed 81% of coulombic efficiency (bio-anode) and 97% of sulfate reduction with 99.3% Sb (V) reduction (bio-cathode), and it was concluded that the MeS precipitation entirely depends on sulfide concentration via SR10 sulfate reduction. The MFC-SR10 offers a maximum power density of 1652.9 ± 32.1 mW/m3, and their performance was depicted using cyclic voltammetry and electrochemical impedance spectroscopy. The Sb reduction was evaluated through fluorescence spectroscopy, and the Sb (V) MeS precipitation was confirmed as stibnite (Sb2S3) by Raman spectroscopy and X-ray photoelectron spectroscopy. Furthermore, the matured anodic and cathodic biofilm formation was confirmed by Scanning electron microscopy with Energy-dispersive X-ray spectroscopy. Thus the MFC with SRB bio-cathode can be used as an alternative to simultaneously remove sulfate and Sb from the wastewater with electricity production. |
| Databáze: | OpenAIRE |
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