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Central composite design for the optimization of removal of the azo dye, methyl orange, from waste water using fenton reaction

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Author(s): Azami Mahsa | Bahram Morteza | Nouri Sirous | Naseri Abdolhosein

Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139

Volume: 77;
Issue: 2;
Start page: 235;
Date: 2012;
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Keywords: design of experiments | decolorization | Fenton reaction | methylorange

ABSTRACT
In this study the degradation of Methyl Orange, using Fenton reaction was studied and optimized using central composite design as a response surface methodology. The effects of various experimental parameters in this reaction were investigated using central composite design. 28 experiments, with 4 factors and 5 levels for each factor were designed. These factors (or variables) were: initial concentration of Fe (II), initial concentration of H2O2, initial concentration of oxalate and the reaction time. A full-quadratic polynomial equation between the percentage of dye degradation (as a response) and the studied parameters was established. After removing the non-significant variables from the model, response surface method was used to obtain the optimum conditions. The optimum ranges of variables were: 0.25 - 0.35 mM for initial concentration of Fe (II), 5-17 mM for initial concentration of H2O2, 4-9 mM for initial concentration of oxalate, and 50-80 min for the reaction time. Also the results of extra experiments showed that these optimized values can be used for real samples and yield to a high value for the response.
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