Abstract
A study on the decolorization of azo dye wastewater by sponge iron was carried out in order to establish a model of decolorization kinetics, and to investigate the effects of particle size of sponge iron, the initial pH of azo dye wastewater and reaction temperature on the reaction rate constant. The results showed that the decolorization processes of azo dye wastewater by sponge iron was first order kinetic reaction, and reaction rate constant presented high value on the condition of small particle size of sponge iron, low initial pH of azo dye wastewater and high reaction temperature.
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