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

Yonghyeon Lee, Mingcan Cui, Jongbok Choi, Jeonggwan Kim, Younggyu Son, Jeehyeong Khim

Research output: Contribution to journalArticle

9 Citations (Scopus)

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 60 h 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.

Original languageEnglish
Pages (from-to)1116-1125
Number of pages10
JournalJournal of Hazardous Materials
Volume344
DOIs
Publication statusPublished - 2018 Feb 15

Fingerprint

Photocatalysis
dibenzofuran
Hexane
dioxin
Heterojunctions
Soil
Soils
Light
Degradation
degradation
Scavenging
Photocatalysts
soil
Dechlorination
PCDD
dechlorination
hydroxyl radical
Impurities
Atoms
chloride

Keywords

  • p-n Heterojunction photocatalyst
  • PCDD/F
  • Real-field soil
  • Solvent
  • Visible-light photocatalysis

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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 . / Lee, Yonghyeon; Cui, Mingcan; Choi, Jongbok; Kim, Jeonggwan; Son, Younggyu; Khim, Jeehyeong.

In: Journal of Hazardous Materials, Vol. 344, 15.02.2018, p. 1116-1125.

Research output: Contribution to journalArticle

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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 60 h 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.",
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AU - Cui, Mingcan

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AU - Son, Younggyu

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