Photocatalytic degradation of azo dye in TiO2 suspended solution.
Water Sci Technol
; 43(2): 313-20, 2001.
Article
em En
| MEDLINE
| ID: mdl-11380196
ABSTRACT
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 TiO2 present during the reaction. The reaction rates were proportional to TiO2 concentration and light intensity with the power order of 0.726 and 0.734, respectively.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Compostos Azo
/
Titânio
/
Eliminação de Resíduos Líquidos
/
Corantes
Idioma:
En
Revista:
Water Sci Technol
Assunto da revista:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Taiwan