Comparison of the photoactivities of two commercial titanium dioxide powders in the degradation of 1,4-dioxane

M Mehrvar,W A Anderson,M Moo-Young

doi:10.1155/s1110662x02000168

M Mehrvar, W A Anderson + Show 1 more

Open Access

https://doi.org/10.1155/s1110662x02000168

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Abstract

Two different commercial photocatalysts, Degussa P25 and Hombikat UV 100, were used to degrade 1,4-dioxane photocatalytically in an annular slurry photoreactor. The optimum photocatalyst loading for Degussa P25 was found to be1.5gL-1while for Hombikat UV 100 was between3.0−4.0gL-1. The photoactivity of Degussa P25 is higher than that of Hombikat at lower photocatalyst loadings whereas it is lower at higher photocatalyst loadings. This was found both experimentally and also by mathematical modeling of the radiation within the photoreactor zone. The photoactivity of UV 100 titanium dioxide was found to be twice that of Degussa P25 at optimum loadings.

Highlights

N-type titanium dioxide is the most commonly used photocatalyst in photocatalytic treatment of water and wastewater because of its superior photoactivity and low toxicity [1]
The photoactivity of Degussa P25 was higher at low photocatalyst loadings ([TiO2]
Mathematical modeling of the radiation within the photoreactor zone showed similar results, which indicates Hombikat UV 100 was superior at higher titanium dioxide loadings, while Degussa P25 was superior at lower titanium dioxide loadings

Summary

INTRODUCTION

N-type titanium dioxide is the most commonly used photocatalyst in photocatalytic treatment of water and wastewater because of its superior photoactivity and low toxicity [1]. There are many different sources of titanium dioxide, Degussa P25 TiO2 has effectively become a research standard because of its well-defined nature. Degussa P25 TiO2 has a substantially higher photocatalytic activity than most of the other available samples of TiO2 [1]. Photocatalytic destruction of 1,4-dioxane using two commercially available titanium dioxide photocatalysts, Degussa P25 and Hombikat UV 100, has been studied to compare their photoactivities as a function of concentration in a slurry photoreactor. It has been previously shown that 1,4-dioxane is photocatalytically degradable, and kinetic studies are reported thoroughly in the literature [2,3,4,5]

MATERIALS AND METHODS

RESULTS AND DISCUSSION

Degussa P25 Titanium Dioxide

Hombikat UV 100 Titanium Dioxide

Comparison between Degussa P25 and Hombikat UV 100 Titanium Dioxides

CONCLUSION