IJEP 42(5): 515-524 : Vol. 42 Issue. 5 (May 2022)
1. ERK Arts and Science College, Department of Chemistry, Dharmapuri – 636 905, Tamil Nadu, India
2. Shri Sakthikailassh Womens College, Department of Chemistry, Salem – 636 003, Tamil Nadu, India
3. Muthayammal Arts and Science College, Department of Physics, Rasipuram – 637 408, Tamil Nadu, India
4. ERK Arts and Science College, Department of Physics, Dharmapuri – 636 905, Tamil Nadu, India
Abstract
The ternary heterojunction composites have been prepared and evaluated from their activity in the degradation of reactive black 5 in the presence of UV-visible light. The mineralization of reactive dyes with triazine groups has been reported to be more difficult in most treatment methods. However, at higher concentrations, the dye solutions, especially chlorotriazine dye transmit only very small portion of photons to reach the photocatalyst surface. Hence, degradation of these dyes at higher concentration levels is more difficult by using single photocatalysts. However, in most cases combination of two or more photocatalyst are found to be more efficient than the individual photocatalyst for the degradation of higher concentration dyes. Hence, CdS/Fe2O3/TiO2 ternary composites (CFT) showed higher photocatalytic activity than that of CdS, TiO2, Fe2O3, CdS/TiO2 and CdS Fe2O3/TiO2. CFT ternary composites show favourable photocatalytic activity at pH 3. All the photocatalysts show anatase crystalline phase was confirmed by X-Ray diffraction analysis. The CFT ternary photocatalyst shows an absorption threshold extended into the visible region and also has smaller particle size compared to binary and bare photocatalytic systems.
Keywords
CdS/Fe2O3/TiO2 ternary composites, Reactive Black 5, Solar light irradiation, anatase phase, Reusability
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