Photodegradation of benzene by TiO2 nanoparticles prepared by flame CVD process--颗粒学报PARTICUOLOGY

Xie, H., Zhu, L., Wang, L., Chen, S., Yang, D., Yang, L., Gao, G., & Yuan, H. (2011). Photodegradation of benzene by TiO2 nanoparticles prepared by flame CVD process. Particuology, 9(1), 75-79. https://doi.org/10.1016/j.partic.2010.05.010

Photodegradation of benzene by TiO₂ nanoparticles prepared by flame CVD process

Hongyong Xie^*, Luping Zhu, Lingling Wang, Shengwen Chen, Dandan Yang, Lijun Yang, Guilan Gao, Hao Yuan

School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, 2360 Jinhai Road, Pudong, Shanghai 201209, China

10.1016/j.partic.2010.05.010

Volume 9, Issue 1, February 2011, Pages 75-79

Received 8 October 2009, Revised 25 March 2010, Accepted 21 May 2010, Available online 4 August 2010.

E-mail: hyxie@eed.sspu.cn

Highlights

Abstract

Photodegradation of benzene at ppb levels by mixed-phase TiO₂ nanoparticles, synthesized by the oxidation of TiCl₄ in propane/air turbulent flame chemical vapor deposition (CVD) process, is investigated experimentally by using a tubular photoreactor with thin TiO₂ films coated on the reactor wall by sedimentation. Effects of inlet benzene concentration from 10 to 300 μg/m³, rutile mass fraction from about 20 to 50% and photoluminescence (PL) intensity of TiO₂ nanoparticles on degradation degree are examined under the conditions of 70% relative humidity, 38 μg/cm² catalyst loading, 24 mW/cm² UV irradiation of 254 nm and 5.7 s residence time in the reactor. Based on experimental results, separation of photo-induced electron (e⁻) and hole (h⁺) pairs by rutile phase is discussed as photo-induced electron (e⁻) in anatase phase will migrate to rutile surface due to that the potential of conductive band of rutile is lower than that of anatase, leading to more holes ready on anatase surface for oxidation reactions.

Graphical abstract

Keywords

Photodegradation; Benzene; TiO₂ nanoparticles; Flame CVD; Carrier separation; Rutile/anatase phases

文章导读