In this study, decoloration of reactive dyes with different structures has been discussed by using Multiwalled Carbon Nanotubes (MWCNTs) and hydrogen peroxide under UV radiation. Adsorption rate was investigated under various parameters (initial dye concentration, salt and pH). The dye removal results has been significantly decreased by increasing of dye concentration with the optimal value of carbon nanotubes (0.2 g/l) and pH=4. Also, by raising the salt dosage, the dye removal is gradually reduced. The COD removal results indicated that the hydrogen peroxide under UV radiation causes degradation color and producing pollutant. The results of coefficient constant R2 showed that the dye adsorption of this reactive dyes were correlated reasonably well by Langmuir isotherm. Moreover, the kinetic of this dyes according to their coefficient constant followed the second-order pseudo model.
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