Degradation of refractory organics in dual-cathode electro-Fenton using air-cathode for H₂O₂ electrogeneration and microbial fuel cell cathode for Fe²⁺ regeneration

TY - JOUR

T1 - Degradation of refractory organics in dual-cathode electro-Fenton using air-cathode for H2O2 electrogeneration and microbial fuel cell cathode for Fe2+ regeneration

AU - Wang, Dongliang

AU - Hu, Jingping

AU - Liu, Bingchuan

AU - Hou, Huijie

AU - Yang, Jiakuan

AU - Li, Yuxiao

AU - Zhu, Yi

AU - liang, Sha

AU - Xiao, Keke

N1 - Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/6/15

Y1 - 2021/6/15

N2 - The electrogeneration of H2O2 and electro-regeneration of ferrous are conflicting matters in electro-Fenton system. In this research, the degradation of Rhodamine B, methyl orange (MO) and 4-chlorophenol (4-CP) was investigated using a novel dual-cathode microbial fuel cell (MFC) electro-Fenton (EF) hybrid system. An air-cathode of an EF system was used for H2O2 electrogeneration and a carbon felt cathode of a MFC was used to accelerate Fe2+ regeneration. Synergistic improvement of MFC power generation and the degradation of the above refractory organics through EF reaction was achieved. The EF air-cathode was fabricated by adopting activated carbon/graphite powder mixture and PVDF binder, which showed higher H2O2 generation but slower Fe3+ reduction rate than MFC carbon felt cathode. The Rhodamine B removal rate constant and mineralization current efficiency of the MFC coupled EF were 64% and 42% higher than that of uncoupled EF, respectively. The MFC-EF coupled system also exhibited significantly higher removal efficiency for MO and 4-CP than that of un-coupled EF system. Moreover, the power density of MFC was greatly enhanced by coupling EF due to higher Fe3+/Fe2+ redox potential than oxygen reduction.

AB - The electrogeneration of H2O2 and electro-regeneration of ferrous are conflicting matters in electro-Fenton system. In this research, the degradation of Rhodamine B, methyl orange (MO) and 4-chlorophenol (4-CP) was investigated using a novel dual-cathode microbial fuel cell (MFC) electro-Fenton (EF) hybrid system. An air-cathode of an EF system was used for H2O2 electrogeneration and a carbon felt cathode of a MFC was used to accelerate Fe2+ regeneration. Synergistic improvement of MFC power generation and the degradation of the above refractory organics through EF reaction was achieved. The EF air-cathode was fabricated by adopting activated carbon/graphite powder mixture and PVDF binder, which showed higher H2O2 generation but slower Fe3+ reduction rate than MFC carbon felt cathode. The Rhodamine B removal rate constant and mineralization current efficiency of the MFC coupled EF were 64% and 42% higher than that of uncoupled EF, respectively. The MFC-EF coupled system also exhibited significantly higher removal efficiency for MO and 4-CP than that of un-coupled EF system. Moreover, the power density of MFC was greatly enhanced by coupling EF due to higher Fe3+/Fe2+ redox potential than oxygen reduction.

KW - Degradation

KW - Dual-cathode

KW - Electro-Fenton

KW - Microbial fuel cell

KW - Power generation

UR - http://www.scopus.com/inward/record.url?scp=85100404126&partnerID=8YFLogxK

U2 - 10.1016/j.jhazmat.2021.125269

DO - 10.1016/j.jhazmat.2021.125269

M3 - 文章

C2 - 33550124

AN - SCOPUS:85100404126

SN - 0304-3894

VL - 412

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

M1 - 125269

ER -