The photocatalysis of azo dye, Orange G, by P-25 anatase TiO2 was investigated in this research. The experiments were conducted in a batch reactor with TiO2 powder suspension. Four near-UV lamps were used as the light source. The experimental variables included solution pH level, amount of TiO2, illumination light intensity, and reaction time. A pseudo-first order reaction kinetic was proposed to simulate the photocatalytic degradation of Orange G in the batch reactor. More than 80% of 10 mg/L Orange G decomposition in 60-minute reaction time was observed in this study and fast decomposition of Orange G only occurred in the presence of both TiO2 and suitable light energy. Faster degradation of Orange G was achieved under acid conditions. The degradation rates of Orange G at pH = 3.0 were about two times faster than those at pH = 7.0. Faster degradation of azo dye was observed for greater irradiated light intensity and more TiO present during the reaction. The reaction rates were proportional to TiO2concentration and light intensity with the power order of 0.726 and 0.734, respectively.
Skip Nav Destination
Article navigation
Research Article|
January 01 2001
Photocatalytic degradation of azo dye in TiO2 suspended solution Available to Purchase
C.-H. Hung;
C.-H. Hung
1Department of Environmental Engineering, Foo-Yin Institute of Technology, 151 Chung-Hsueh Road, Taliao 831, Kaoshiung Hsien, Taiwan
Search for other works by this author on:
P.-C. Chiang;
P.-C. Chiang
2Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan
Search for other works by this author on:
C. Yuan;
C. Yuan
3Department of Civil Engineering, I-Shou University, Kaoshiung Hsien, Taiwan Current address: Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Yanchau, Kaohsiung 824, Taiwan
Search for other works by this author on:
C.-Y. Chou
C.-Y. Chou
1Department of Environmental Engineering, Foo-Yin Institute of Technology, 151 Chung-Hsueh Road, Taliao 831, Kaoshiung Hsien, Taiwan
Search for other works by this author on:
Water Sci Technol (2001) 43 (2): 313–320.
Citation
C.-H. Hung, P.-C. Chiang, C. Yuan, C.-Y. Chou; Photocatalytic degradation of azo dye in TiO2 suspended solution. Water Sci Technol 1 January 2001; 43 (2): 313–320. doi: https://doi.org/10.2166/wst.2001.0105
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
eBook
Pay-Per-View Access
$38.00