Redox mediator as cathode modifier for enhanced degradation of azo dye in a sequential dual chamber microbial fuel cell-aerobic treatment process
Redox mediator as cathode modifier for enhanced degradation of azo dye in a sequential dual chamber microbial fuel cell-aerobic treatment process
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DOI：
10.1016/j.ijhydene.2021.09.151
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发表时间：
2021-10
影响因子：
7.2
通讯作者：
Mohammad Danish Khan;Ravikumar Thimmappa;A. Anwer;Nishat Khan;S. Tabraiz;Da Li;M. Z. Khan;E. Yu
中科院分区：
文献类型：
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作者：
Mohammad Danish Khan;Ravikumar Thimmappa;A. Anwer;Nishat Khan;S. Tabraiz;Da Li;M. Z. Khan;E. Yu
在双室微生物燃料电池（DCMFCs）中，研究了以噻吩（TH）和蒽醌-2-磺酸（AQS）为氧化还原介质的阴极电子向偶氮染料酸性蓝29（AB 29）的转移.使用电聚合TH（192 h）和AQS（264 h）阴极去除超过90%的颜色。TH-MFC、AQS-MFC和未改性MFC阴极室厌氧处理后的COD去除率分别为76.6 ± 1.7、70.8 ± 2.5和18.3 ± 2.9%，好氧后处理后分别提高到85.4 ± 1.5、79.8 ± 3和20.6 ± 2.1%。气相色谱-质谱（GC-MS）的研究表明，形成的芳香胺的DCMFCs进一步降解成低分子量的产品在有氧后处理。电化学阻抗谱（EIS）分析表明，TH阴极的电荷转移电阻最低，从而提高了电化学反应和电子转移速率。这些结果表明，利用基于改性阴极的DCMFC-好氧后处理工艺沿着生物发电可以有效地降解AB 29。
The electron transfer from cathode to azo dye Acid Blue 29 (AB29) using thionine (TH) and anthraquinone-2-sulfonate (AQS) redox mediators were investigated in dual chamber microbial fuel cells (DCMFCs). More than 90% of color was removed using electropolymerized TH (192 h) and AQS (264 h) cathodes. Chemical oxygen demand (COD) removal after anaerobic treatment in cathode chamber of TH-MFC, AQS-MFC and unmodified-MFC were 76.6 ± 1.7, 70.8 ± 2.5 and 18.3 ± 2.9%, respectively, which increased to 85.4 ± 1.5, 79.8 ± 3 and 20.6 ± 2.1%, respectively, after aerobic post treatment. Gas chromatography–mass spectrometry (GC–MS) investigations revealed the formation of aromatic amines in DCMFCs which were further degraded into low molecular-weight products in the aerobic post treatment. Electrochemical impedance spectroscopic (EIS) analysis showed lowest charge transfer resistance of TH-cathode which increased the electrochemical reactions and electron transfer rates. These results indicated that AB29 can be efficiently degraded by utilizing modified cathode based DCMFC-aerobic post treatment process along with bioelectricity generation.