Issue 8, 2020

Integrated adsorption and photocatalytic degradation of VOCs using a TiO2/diatomite composite: effects of relative humidity and reaction atmosphere

Abstract

In this study, the adsorption and photocatalytic degradation performances of a TiO2/diatomite composite were investigated using ketones and alcohols with different carbon chain lengths as target pollutants. The effects of relative humidity and oxygen on the photocatalytic process of the composite and the different roles of water vapor and oxygen in this process were investigated. The adsorption capacity of VOCs over the composite decreased exponentially with the increase of relative humidity. During the degradation of the ketones and alcohols using the composite, the optimal relative humidity condition for VOC degradation was related to the length of the carbon chain. The optimal relative humidity for acetone, 2-butanone, and 2-heptanone degradation was 5%, 15%, and 30%, respectively. For the tested alcohols, the optimal relative humidity for degradation of isopropanol, isobutanol, and 1-heptanol was 5%, 15%, and 50%, respectively. When dry air was used, a high VOC degradation rate was observed. However, at the optimum relative humidity but in the absence of oxygen, VOC degradation hardly occurred. Compared with water vapor, oxygen played a more important role in the photocatalytic degradation of ketones and alcohols by the TiO2/diatomite composite.

Graphical abstract: Integrated adsorption and photocatalytic degradation of VOCs using a TiO2/diatomite composite: effects of relative humidity and reaction atmosphere

Article information

Article type
Paper
Submitted
26 Jan 2020
Accepted
21 Mar 2020
First published
23 Mar 2020

Catal. Sci. Technol., 2020,10, 2378-2388

Integrated adsorption and photocatalytic degradation of VOCs using a TiO2/diatomite composite: effects of relative humidity and reaction atmosphere

G. Zhang, A. Peyravi, Z. Hashisho, Z. Sun, Y. Liu, S. Zheng and L. Zhong, Catal. Sci. Technol., 2020, 10, 2378 DOI: 10.1039/D0CY00168F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements