Photocatalytic degradation of model textile dyes in wastewater using ZnO as semiconductor catalyst

Sampa Chakrabarti; Binay K Dutta

doi:10.1016/j.jhazmat.2004.05.013

Photocatalytic degradation of model textile dyes in wastewater using ZnO as semiconductor catalyst

J Hazard Mater. 2004 Aug 30;112(3):269-78. doi: 10.1016/j.jhazmat.2004.05.013.

Authors

Sampa Chakrabarti¹, Binay K Dutta

Affiliation

¹ Department of Chemical Engineering, University of Calcutta, 92, Acharya P. C. Road, Kolkata 700 009, India.

PMID: 15302448
DOI: 10.1016/j.jhazmat.2004.05.013

Abstract

Semiconductor photocatalysis often leads to partial or complete mineralization of organic pollutants. Upon irradiation with UV/visible light, semiconductors catalyze redox reactions in presence of air/O2 and water. Here, the potential of a common semiconductor, ZnO, has been explored as an effective catalyst for the photodegradation of two model dyes: Methylene Blue and Eosin Y. A 16 W lamp was the source of UV-radiation in a batch reactor. The effects of process parameters like, catalyst loading, initial dye concentration, airflow rate, UV-radiation intensity, and pH on the extent of photo degradation have been investigated. Substantial reduction of COD, besides removal of colour, was also achieved. A rate equation for the degradation based on Langmuir-Hinshelwood model has been proposed.

Publication types

Comparative Study
Evaluation Study
Research Support, Non-U.S. Gov't

MeSH terms

Catalysis
Coloring Agents / chemistry*
Hydrogen-Ion Concentration
Kinetics
Osmolar Concentration
Photochemistry / methods*
Semiconductors
Textile Industry / methods*
Water Pollutants, Chemical / analysis*
Water Pollution, Chemical / prevention & control*
Zinc Oxide / chemistry*

Substances

Coloring Agents
Water Pollutants, Chemical
Zinc Oxide