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

Lu Li, Liyan Jiang, Liu Yang, Ju Li, Nan Lu and Jiao Qu
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Lu Li: School of Environment, Northeast Normal University, Changchun 130117, China
Liyan Jiang: School of Environment, Northeast Normal University, Changchun 130117, China
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

Sustainability, 2019, vol. 11, issue 13, 1-12

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.

Keywords: degradation kinetic; photoelectrocatalytic system; H 3 PW 12 O 40 /TiO 2 composite film; o-chlorophenol; impressed voltage (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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