Spectral Studies of Solar Radiation Induced Dye Decoloration in Aqueous Solution

  • Fahim Uddin
  • Rafia Azmat
  • Tehseen Ahmed


Currently extensive researches are in progress for the development of de-coloration techniques for the control of textile industries effluents. The dye waste water is hazardous to the environment and presence of many anions like Cl, Br, I and NO 3 is risk with dye effluent. This research is in continuation of first report which is based on the photolytic decoloration of methylene green (MG) with urea (which is commonly used in dye industry) as a powerful reductant by the natural light photon as a simulating source to ascertain the role of light for the cleaning of environment. The different concentrations of MG with urea as a reductant were placed under solar radiation for approximately 5 h with variable concentration of these ions and their spectra were recorded before and after irradiation with induced solar radiation. It was found that maximum de-coloration was observed with solar radiations using optimal operational parameters and radiations safely play an effective role in minimizing the color of dye industrial wastes. Results showed that an initial rate of decolorization depends strongly on incident photon energy when full sun rays emitted photon was used (at 12 noon). Thus it was concluded that natural solar light induced treatment may be helpful in cleaning the environment.


Solar Radiation Chemical Oxygen Demand Color Removal Advanced Oxidation Process Incident Photon Energy 
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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of KarachiKarachiPakistan

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