Adsorption isotherms and kinetic studies of crystal violet dye removal from aqueous solution using surfactant modified magnetic nanoadsorbent

The adsorption studies of crystal violet (CV) dye from aqueous solution using magnetic nanoparticles (MNPs) modified with sodium dodecyl sulphate (SDS) was investigated. The synthesized MNPs were characterized by TEM, EDAX and XRD. In batch optimization studies, the maximum removal efficiency of 80.4% was obtained at the optimum levels of pH 6, contact time 10 min, adsorbent dosage 0.25 g/L and initial dye concentration 10 ppm. The adsorption data was best fitted with Freundlich isotherm (R-2 = 0.957) and maximum adsorption capacity of 166.67 mg/g was determined from Langmuir isotherm. The adsorption of CV by SDS coated MNPs follows the pseudo-second order kinetic model. The results of this study showed that the SDS coated MNPs were found to be cost effective and easily separable nanoadsorbent for efficient removal of crystal violet dye. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.