Comparison between the photocatalytic degradation of single and binary azo dyes in TiO2 suspensions under solar light irradiation

Journal of Water Reuse and Desalination

Ho, Li-Ngee¹  Min, Ohm-Mar²  Ong, Soon-An²  Wong, Yee-Shian² 

[1] School of Materials Engineering, University Malaysia Perlis, 02600 Arau, Perlis, Malaysia;Water Research Group (WAREG), School of Environmental Engineering, University Malaysia Perlis, 02600 Arau, Perlis, Malaysia

关键词: adsorption capacity;    azo dyes;    mineralization;    photocatalytic degradation;    solar light;    titanium dioxide;   

DOI  :  10.2166/wrd.2015.022

学科分类：工程和技术（综合）

来源: IWA Publishing

【 摘 要 】

Textile industries discharge a large quantity of colored wastewater which is harmful to the ecosystem. In this study, two kinds of dyes were investigated: the mono azo Acid Orange 7 (AO7) and diazo Reactive Green 19 (RG19). The photocatalytic degradation of single (AO7, RG19) azo dye and binary (AO7 and RG19 mixture) azo dye aqueous solutions was photocatalyzed by commercial titanium dioxide (TiO2, P25) under solar light irradiation. The objectives of this study are to compare the photocatalytic degradation between single and binary azo dye aqueous solution and to study the various parameters such as the effect of different initial azo dye concentrations, different initial azo dye pH values, and compare the adsorption capacity of azo dyes with and without solar light irradiation, which influences the photocatalytic activities of single and binary azo dye aqueous solutions in a TiO2 suspension. The results showed that photocatalytic degradation of AO7 and RG19 in a single azo dye aqueous solution was faster than a binary azo dye solution under the solar light irradiation process. Chemical oxygen demand results revealed that complete mineralization could be achieved for both AO7 and RG19 azo dyes under solar light irradiation within 22 hours.

【 授权许可】

CC BY-NC-ND