Destruction of Organic Compounds in Water Using Supported Photocatalysts

[+] Author and Article Information
Yin Zhang, J. C. Crittenden, D. W. Hand, D. L. Perram

Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI 49931

J. Sol. Energy Eng 118(2), 123-129 (May 01, 1996) (7 pages) doi:10.1115/1.2847984 History: Received February 01, 1995; Revised August 01, 1995; Online February 14, 2008


Photocatalytic destruction of organic compounds in water is investigated using tanning lamps and fixed-bed photoreactors. Platinized titanium dioxide (Pt-TiO2 ) supported on silica gel is used as a photocatalyst. Complete mineralization of influent concentrations of 4.98 mg/L tetrachloroethylene and 2.35 mg/L p -dichlorobenzene requires a reactor residence time less than 1.3 minutes. While for influent concentrations of 3.58 mg/L 2-chlorobiphenyl, 2.50 mg/L methyl ethyl ketone and 0.49 mg/L carbon tetrachloride, complete mineralization requires reactor residence times of 1.6, 10.5, and 16.8, minutes, respectively. A reactor model is developed using Langmuir-Hinshelwood kinetics and the model parameters are determined using a reference compound, trichloroethylene. Based on the results of experiments with trichloroethylene, the model predicts the mineralization of the aforementioned compounds from ultraviolet (UV) irradiance, influent concentration, hydroxyl radical rate constants, and the known physical properties of the compounds. The model is also able to predict organic destruction using solar insolation (which has a different spectral distribution from the tanning lamps) based on the UV absorption characteristics of titanium dioxide.

Copyright © 1996 by The American Society of Mechanical Engineers
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