Bulletin of Materials Science

, Volume 29, Issue 5, pp 433–438

Photocatalytic degradation of rhodamine B dye using hydrothermally synthesized ZnO

Authors

    • Department of GeologyUniversity of Mysore
  • A. K. Subramani
    • Department of GeologyUniversity of Mysore
  • S. Ananda
    • Department of GeologyUniversity of Mysore
    • Department of ChemistryUniversity of Mysore
  • K. M. Lokanatha Rai
    • Department of GeologyUniversity of Mysore
    • Department of ChemistryUniversity of Mysore
  • R. Dinesh
    • Department of GeologyUniversity of Mysore
    • Materials Structures Laboratory, Centre for Materials DesignTokyo Institute of Technology
  • M. Yoshimura
    • Department of GeologyUniversity of Mysore
    • Materials Structures Laboratory, Centre for Materials DesignTokyo Institute of Technology
Ceramics and Glasses

DOI: 10.1007/BF02914073

Cite this article as:
Byrappa, K., Subramani, A.K., Ananda, S. et al. Bull Mater Sci (2006) 29: 433. doi:10.1007/BF02914073

Abstract

The sunlight mediated photocatalytic degradation of rhodamine B (RB) dye was studied using hydrothermally prepared ZnO (T = 150°C andP ∼ 20–30 bars). Zinc chloride was used as the starting material along with sodium hydroxide as a solvent in the hydrothermal synthesis of ZnO. Different durations were tried to obtain pure ZnO phase, which was later confirmed through powder X-ray diffraction. The photocatalytic behaviour of the prepared ZnO was tested through the degradation of RB. The disappearance of organic molecules follows first-order kinetics. The effect of various parameters such as initial dye concentration, catalyst loading, pH of the medium, temperature of the dye solution, on the photo degradation of RB were investigated. The thermodynamic parameters of the photodegradation of RB, like energy of activation, enthalpy of activation, entropy of activation and free energy of activation revealed the efficiency of the process. An actual textile effluent containing RB as a major constituent along with other dyes and dyeing auxiliaries was treated using hydrothermally synthesized ZnO and the reduction in the chemical oxygen demand (COD) of the treated effluent revealed a complete destruction of the organic molecules along with colour removal.

Keywords

Photocatalysishydrothermalsynthetic ZnOdyesrhodamine Btextile effluent

Copyright information

© The Indian Academy of Sciences 2006