Citation: Sili Qing, Xuanzhao Lu, Yujing Jiang, Charitha Thambiliyagodage, Bing Song, Ao Xia, Jian-Rong Zhang, Wenlei Zhu, Li-Ping Jiang, Xiaoge Wu, Jun-Jie Zhu. ZIF-8 confined carbon dots/bilirubin oxidase on microalgal cells to boost oxygen reduction reaction in photo-biocatalytic fuel cells for pollutants removal[J]. Chinese Chemical Letters, ;2026, 37(1): 110576. doi: 10.1016/j.cclet.2024.110576 shu

ZIF-8 confined carbon dots/bilirubin oxidase on microalgal cells to boost oxygen reduction reaction in photo-biocatalytic fuel cells for pollutants removal

Sili Qing ^a ,
Xuanzhao Lu ^a ,
Yujing Jiang ^b ,
Charitha Thambiliyagodage ^d ,
Bing Song ^e ,
Ao Xia ^{f, g} ,
Jian-Rong Zhang ^a ,
Wenlei Zhu ^b ,
Li-Ping Jiang ^a ,
Xiaoge Wu ^{c, *,} ,
Jun-Jie Zhu ^{a, *,}

a.
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
b.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, the Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, China
c.
Environment Science and Engineering College, Yangzhou University, Yangzhou 225009, China
d.
Faculty of Humanities and Sciences, Sri Lanka Institute of Information Technology, Malabe, Sri Lanka
e.
Scion, Te Papa Tipu Innovation Park, 49 Sala Street, Private Bag 3020, Rotorua 3046, New Zealand
f.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China
g.
Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China

xgwu@yzu.edu.cn

jjzhu@nju.edu.cn

Received Date: 10 September 2024
Revised Date: 4 October 2024
Accepted Date: 22 October 2024
Available Online: 24 October 2024

Figures(5)

Photocatalytic fuel cells provide promising opportunities for sustainable wastewater treatment and energy conversion. However, their applications are challenged by the sluggish oxygen reducton reaction (ORR) kinetics at cathodes owning to the low O₂ solubility and diffusion rate. Herein, we proposed a photo-biocatalytic fuel cell (PBFC) with a novel hybrid biocathode based on artificially engineered algal cells coated by ZIF-8 confined carbon dots/bilirubin oxidase (ZIF-8/CDs/BOD@algae). Microalgae absorbed CO₂ and provided O₂ in situ for BOD catalysts. Due to effective absorption of O₂ by imidazole and confinement of hydrophobic porous ZIF-8, oxygen diffusion has been accelerated in MOF/enzyme systems. Importantly, the introduction of CDs alleviated the poor conductivity of ZIF-8 and improved the electron transfer rate of BOD. Thus, the biocathode exhibited a high current density of 1767 µA/cm², a 2.26-fold increase compared with that of CDs/BOD/algae biocathode. Also, it displayed enduring operational stability for up to 60 h since the firmly wrapped ZIF-8 shells could encapsulate proteins and protect algae from the external stimulation. When coupled with Mo: BiVO₄ photoanodes, the PBFC exhibited a remarkable power output of 131.8 µW/cm² using tetracycline hydrochloride (TCH) as a fuel and an increased degradation rate of TCH. Therefore, this work not only establishs an effective confinement strategy for enzyme to enrich oxygen, but also unveils new possibilities for modified microalgal cells aiding photoelectrocatalytic systems to recover energy from wastewater treatment.
- Microalgal cells,
- ZIF-8,
- Carbon dots,
- ORR,
- Photo-biocatalytic fuel cell,
- Degradation
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