Electrically enhanced photocatalysis for gas-phase benzaldehyde degradation by ordered mesoporous titania/conductive carbon felts. (20th October 2016)

• Record Type: Journal Article
• Authors: Li, Ming; Li, Youjing; Chen, Feitai; Lin, Xiao; Feng, Qiuju
• Is Part Of: Electrochimica acta. Volume 216(2016)
• Page Start: 517
• Page End: 527
• Publication Date: 2016-10-20
• Subjects: gas-phase benzaldehyde -- composite electrode -- liquid-crystal template -- electron microscopy -- electrically enhanced photocatalysis; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.08.054
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: An ordered mesoporous titania/conductive carbon felt (OMT/CCF) composite electrode has been assembled by a liquid-crystal-template method with the assistance of ultrasonic deposition for the first time. This OMT/CCF electrode was then used for the electrically enhanced photocatalytic (EEP) degradation of gas-phase benzaldehyde (GPB). Analytical characterization of the obtained OMT/CCF showed that it had an ordered mesostructure with small crystallite size and high surface area. It exhibited the highest gas-phase EEP activity for GPB degradation, exceeding those of nanoparticle titania/CCF (NPT/CCF), OMT/indium-tin oxide (OMT/ITO), and P-25/ITO by factors of 2.1, 2.4, and 2.8, respectively. Furthermore, the OMT/CCF exhibited highly stable gas-phase EEP degradation efficiency over many cycles. The mechanism underpinning the significantly enhanced gas-phase EEP efficiency has been analyzed. A kinetic model has been established using response surface methodology to describe the relationship between the rate constant and the affecting parameters. Optimized parameters were found to be a light intensity of 72 mW cm −2 with a bias voltage of 40 V. On the basis of the identified intermediates of GPB in the EEP degradation process, a degradation mechanism is proposed.