External potential regulated biocathode for enhanced removal of gaseous chlorobenzene in bioelectrchemical system

Ying, Zanyun; Chen, Han; Gao, Jialing; Zhang, Shihan; Peng, Rui-Jian; You, Juping; Chen, Jianmeng; Zhao, Jingkai

doi:10.1016/j.chemosphere.2021.129990

Cited by 17 publications

(3 citation statements)

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“…KCl electrode (+0.197 V vs the standard hydrogen electrode, SHE) was inserted in the cathode compartment of each reactor as the reference. Cathode potential was controlled at −0.3 V (vs SHE) using a CHI 1040C multi-channel potentiostat (CH Instruments, Shanghai, China) according to the conclusion from our previous work . All potentials in this article refer to SHE.…”

Section: Methodsmentioning

confidence: 99%

“…Cathode potential was controlled at −0.3 V (vs SHE) using a CHI 1040C multi-channel potentiostat (CH Instruments, Shanghai, China) according to the conclusion from our previous work. 19 All potentials in this article refer to SHE.…”

Section: Reactor Setupmentioning

confidence: 99%

“…The catholyte containing Na 2 HPO 4 •12H 2 O (22.20 g), (NH 4 ) 2 SO 4 (0.66 g), MgSO 4 (0.11 g), NaH 2 PO 4 •2H 2 O (5.93 g), K 2 SO 4 (0.12 g), vitamins (0.62 mL), and trace elements (1.25 mL) per liter of deionized water was prepared before being fed to MECs, as previously described. 19 A similar solution, but without the vitamins and minerals, was added to the anode compartment. Prior to use, both catholyte and anolyte were sparged with pure nitrogen for approximately 30 min to remove oxygen from headspace and solution.…”

Section: Reactor Setupmentioning

confidence: 99%

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Structural Characteristics and Functional Genes of Biofilms in Microbial Electrolysis Cells for Chlorobenzene Abatement

Ying

Chen

et al. 2023

ACS EST Water

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Chlorobenzene (CB) is typically emitted during industry and waste incineration, posing hazards to the safety of humans and the ecosystem. Successful CB elimination has been achieved in microbial electrolysis cells (MECs), whereas little is known about elimination effectiveness in response to the structural and functional characteristics of biofilms. Herein, the bacterial viability and functional gene abundance of biofilms in MECs with carbon cloth (CC), reticulated vitreous carbon (RVC), and nickel foam (NF) as cathodes are emphasized. Experimental results reveal that bacterial viability on RVC is 62 and 92% higher than that of CC and NF, respectively, achieving 30 and 65% superior CB removal efficiency. Notably, the MEC with RVC outperforms that with the highly conductive NF due to low electron loss, causing a twice as much increase in coulombic efficiency. Metagenomic analysis indicates that the CB degrader (i.e., Pandoraea), electrochemically active bacteria (i.e., Chryseobacterium), and genes responsible for CB metabolism (i.e., todD and clcB) in RVC biofilms increase by over 30%, fourfold, and 10%, respectively, compared to CC and NF. Moreover, CB degradation is found to occur via two possible pathways: (1) thorough elimination by dechlorination, hydrolysis, and oxidation after conversion to 3-chlorocatechol, and (2) conversion into phenol and benzoate for complete degradation.

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Section: Methodsmentioning

confidence: 99%

Section: Reactor Setupmentioning

confidence: 99%

Section: Reactor Setupmentioning

confidence: 99%

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