Degradation of polychlorinated dibenzo-p-dioxins and dibenzofurans in real-field soil by an integrated visible-light photocatalysis and solvent migration system with p-n heterojunction BiVO4/Bi2O3
- Authors
- Lee, Yonghyeon; Cui, Mingcan; Choi, Jongbok; Kim, Jeonggwan; Son, Younggyu; Khim, Jeehyeong
- Issue Date
- 15-2월-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- PCDD/F; p-n Heterojunction photocatalyst; Visible-light photocatalysis; Solvent; Real-field soil
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.344, pp.1116 - 1125
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 344
- Start Page
- 1116
- End Page
- 1125
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/77350
- DOI
- 10.1016/j.jhazmat.2017.12.002
- ISSN
- 0304-3894
- Abstract
- Degradation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in real-field soil was conducted using an integrated photocatalysis-solvent migration system of BiVO4/Bi2O3 and n-hexane. The photocatalyst BiVO4/Bi2O3 was synthesized, and its performance was found to be affected by the BiVO4 content, with 20 wt% BiVO4 showing the best performance owing to its p-n heterojunction being well formed. Migration was affected by the amount of n-hexane, with 15% n-hexane giving the most effective transportation of PCDD/Fs. 37.2% of 17 PCDD/Fs was removed in 60h by the integrated photocatalysis-solvent migration system, although the reaction zone covered 8.5% of the volume of the soil. The result showed that migration via n-hexane fulfilled the aim of carrying contaminants from inside of the soil to the surface. Electron-scavenging experiments with BiVO4/Bi2O3 showed an 18.4% of performance in removal compared to no-scavenging condition, which showed that the main reactions driving BiVO4/Bi2O3 visible light photocatalysis for aryl-chloride were found to be reduction-based. Owing to the hindering effect of Cl atoms, degradation by hydroxyl radical could proceed after initial dechlorination. This study establishes the applicability of integrated photocatalysis-solvent migration systems in real-field settings, and is the first report of a visible-light photocatalyst, BiVO4/Bi2O3, for the degradation of PCDD/Fs in soil. (C) 2017 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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