Unexpected discovery of superoxide radical generation by oxygen vacancies containing biomass derived granular activated carbon
- Authors
- Choong, Choe Earn; Wong, Kien Tiek; Kim, Hyeseong; Jang, Seok Byum; Yoon, So Yeon; Nah, In Wook; Kim, Wooyul; Kim, Sang-Hyoun; Jeon, Byong-Hun; Yoon, Yeomin; Jang, Min
- Issue Date
- 15-Feb-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Granular palm shell activated carbon; Oxygen vacancies; Superoxide radical; Adsorption; Photocatalyst
- Citation
- WATER RESEARCH, v.190, pp 1 - 11
- Pages
- 11
- Journal Title
- WATER RESEARCH
- Volume
- 190
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/153158
- DOI
- 10.1016/j.watres.2020.116757
- ISSN
- 0043-1354
1879-2448
- Abstract
- l Herein, we discovered and reported oxygen vacancies in silicon oxycarbide containing granular palm shell activated carbon (Si-PSAC) as a photocatalyst under UV irradiation. A strong correlation between the atomic content of Si1+, oxygen vacancies and photocatalytic performance of Si-PSAC was obtained. Based on the electron paramagnetic resonance and photoluminescence analyses, Si-PSAC under UVA(365) irradiation exhibited a higher donor density, better charge transfer and lower electron-hole recombination than that under the other light sources, leading to a higher O-2(center dot-) production efficiency. Si-PSAC exhibited effective removal performance for various anionic dyes and endocrine-disrupting chemicals under UVA(365) irradiation. Continuous-flow column tests revealed the life span of Si-PSAC under UVA(365) irradiation was extended by more than 16-fold compared to adsorption column. Since the oxygen vacancies can be created from the naturally present Si in the biomass derived Si-PSAC during the activation, this unexpected discovery of O-2(center dot-) production can extend commercially-available Si-PSAC into the full-scale photocatalysis. (c) 2020 Elsevier Ltd. All rights reserved.
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