Acetate production from inorganic carbon (HCO3-) in photo-assisted biocathode microbial electrosynthesis systems using WO3/MoO3/g-C3N4 heterojunctions and Serratia marcescens species
journal contributionposted on 2020-02-04, 09:43 authored by Zhenghong Cai, Liping Huang, Xie Quan, Zongbin Zhao, Yong Shi, Gianluca Li-PumaGianluca Li-Puma
The efficient production of acetate from HCO3− is demonstrated in a photo-assisted microbial electrosynthesis system (MES) incorporating a WO3/MoO3/g-C3N4 heterojunction photo-assisted biocathode supporting Serratia marcescens Q1 electrotroph. The WO3/MoO3/g-C3N4 structured electrode consisting of a layer of g-C3N4 coated on graphite felt decorated with W/Mo oxides nanoparticles exhibited stable photocurrents, 4.8 times higher than the g-C3N4 electrode and acetate production of 3.12 ± 0.20 mM/d with a CEacetate of 73 ± 4 % and current of 2.5 ± 0.3 A/m2. Photo-induced electrons on the conduction bands of WO3/MoO3/g-C3N4 favoured hydrogen evolution, which was metabolized by S. marcescens with HCO3− to acetate, while the holes were refilled by the electrons travelling from the anode. Such mechanism reduced the interfacial resistances creating a supplementary driving force leading to higher acetate production. The biocompatible components of WO3/MoO3/g-C3N4 synergistically couple light-harvesting and further catalyze S. marcescens to acetate from HCO3−, providing a feasible strategy for achieving sustainable high rates of acetate production.
National Natural Science Foundation of China (Nos. 21777017 and 51578104)
- Aeronautical, Automotive, Chemical and Materials Engineering
- Chemical Engineering
Published inApplied Catalysis B: Environmental
- AM (Accepted Manuscript)
Rights holder© Elsevier B.V.
Publisher statementThis paper was accepted for publication in the journal Applied Catalysis B: Environmental and the definitive published version is available at https://doi.org/10.1016/j.apcatb.2020.118611.