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Optimization of Degradation Kinetics towards O-CP in H 3 PW 12 O 40 /TiO 2 Photoelectrocatalytic System

Author

Listed:
  • Lu Li

    (School of Environment, Northeast Normal University, Changchun 130117, China
    These authors contributed equally.)

  • Liyan Jiang

    (School of Environment, Northeast Normal University, Changchun 130117, China
    These authors contributed equally.)

  • Liu Yang

    (School of Environment, Northeast Normal University, Changchun 130117, China)

  • Ju Li

    (School of Environment, Northeast Normal University, Changchun 130117, China)

  • Nan Lu

    (School of Environment, Northeast Normal University, Changchun 130117, China)

  • Jiao Qu

    (School of Environment, Northeast Normal University, Changchun 130117, China)

Abstract

Kinetics is crucial for photoelectrocatalytic degradation of organic contaminants. A 12-tungstophosphoric acid/titania (H 3 PW 12 O 40 /TiO 2 ) composite film was prepared by the sol-gel-hydrothermal route to investigate the optimal conditions and degradation kinetics of o-chlorophenol (o-CP). The photoelectrocatalytic degradation efficiency of o-CP was 96.6% after 180 min under optimum conditions (impressed voltage: 0.5 V, solution pH: 6.3, and initial concentration: 5 mg·L −1 ), and the apparent kinetics constant ( K’ ) was a 6.0-fold increase compared to the photocatalytic system. Furthermore, the photoeletrocatalytic reaction rate of o-CP by H 3 PW 12 O 40 /TiO 2 and TiO 2 film was 0.090 and 0.020 mg·L −1 ·min −1 , respectively, and a higher apparent quantum yield (Φ = 32.14%) of H 3 PW 12 O 40 /TiO 2 composite film was attained compared to TiO 2 film (Φ = 10.00%), owing to the fact that more photo-generated carriers were produced and effectively separated. Intermediate products identified during o-CP degradation by liquid chromatography-mass spectrometer (LC-MS) were 2-Chlorohydroquinone (CHQ), catechol (CT), and hydroxyl-hydroquinone (H-HQ). The H 3 PW 12 O 40 /TiO 2 photoelectrocatalytic system exhibited outstanding potential for the removal of chlorinated organic contaminants in wastewater.

Suggested Citation

  • Lu Li & Liyan Jiang & Liu Yang & Ju Li & Nan Lu & Jiao Qu, 2019. "Optimization of Degradation Kinetics towards O-CP in H 3 PW 12 O 40 /TiO 2 Photoelectrocatalytic System," Sustainability, MDPI, vol. 11(13), pages 1-12, June.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:13:p:3551-:d:243654
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