Optimization of Operating Parameters for Decolorization of Metal Complex Dyes by UV/H₂O₂ Process

Abstract:

In this paper, the effects of operating parameters such as UV light wavelength, initial pH, reaction temperature and hydrogen peroxide concentration on decolorization of metal complex dyes (Neutral Bordeaux GRL, Neutral Pink BL and Neutral Blue BNL) by UV/H₂O₂ process were studied in detail. The results showed that the decolorization rate constants were obviously enhanced with the increase of UV intensity. In UV (254nm)/H₂O₂ system, 94.4% decolorization of Neutral Bordeaux GRL, 99.2% decolorization of Neutral Pink BL and 65.4% decolorization of Neutral Blue BNL were achieved after 60 min reaction. The results also indicated that both suitable amount of H₂O₂ and initial pH were needed for effective decolorization of different metal complex dyes. The reaction activation energy of Neutral Bordeaux GRL, Neutral Pink BL and Neutral Blue BNL were 3.43, 14.4 and 23.39 KJ mol^-1, respectively.

• Periodical: Advanced Materials Research (Volumes 347-353)
• Pages: 2245-2248
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.347-353.2245
• Online since: October 2011
• Authors: Jing Jian Zhu, Long Lu, Jian Xin Chen
• Keywords: Hydroxyl Radical, Metal Complex Dye, UV/H₂O₂ Process, Wastewater Treatment

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