Liquid phase heterogeneous photocatalytic ozonation of phenol in liquid–solid fluidized bed: Simplified kinetic modeling--颗粒学报PARTICUOLOGY

Dong, S., Zhou, D., & Bi, X. (2010). Liquid phase heterogeneous photocatalytic ozonation of phenol in liquid–solid fluidized bed: Simplified kinetic modeling. Particuology, 8(1), 60–66. https://doi.org/10.1016/j.partic.2009.04.011

Liquid phase heterogeneous photocatalytic ozonation of phenol in liquid–solid fluidized bed: Simplified kinetic modeling

Shuangshi Dong ^a, Dandan Zhou ^a, Xiaotao Bi ^b *

a College of Environment and Resources, Jilin University, Changchun, China
b Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, Canada V6T 1Z3

10.1016/j.partic.2009.04.011

Volume 8, Issue 1, February 2010, Pages 60-66

Received 6 November 2008, Accepted 16 April 2009, Available online 22 September 2009.

E-mail: xbi@chbe.ubc.ca

Highlights

Abstract

The isotherms of original AC (activated carbon) and photocatalysts (TiO₂-AC) calcined at 500 °C for phenol were measured. The results showed a reversible adsorption of phenol onto both kinds of particles at 25 °C, and could be fitted well to the Freundlich adsorption equation for the dilute solution. Five oxidation processes, namely O₃, O₃/UV, O₃/UV/AC, O₂/UV/TiO₂ and O₃/UV/TiO₂, for phenol degradation in fluidized bed were evaluated and compared, and the photocatalytic ozonation was found to give the highest phenol conversion because of the combined actions of homogenous ozonation in the liquid phase, heterogeneous ozonation on the surface of the catalyst support, i.e. activated carbon, and heterogeneous photocatalytic oxidation on the TiO₂ catalyst surface. With the simplified kinetic model, photolytic ozonation was confirmed to predominantly take place on the particle surface in comparison with the heterogeneous and homogeneous photolytic ozonation. Additionally, the heterogeneous photocatalytic oxidation constant was found to be enhanced by 3.73 times in photocatlaytic ozonation process with ozone as the scavenger compared to the photocatalytic oxidation process with oxygen as the scavenger.

Graphical abstract

Keywords

Titanium dioxide; Activated carbon; Ozone; Photocatalytic ozonation; Phenol

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