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

•Nanoscale magnetic nanoparticles were prepared by co-precipitation route.•MNPs were characterized by TEM,XRD and EDAX.•SDS was used as coating agent to prepare reusable modified nanoadsorbent.•Crystal violet dye removal efficiency of SDS coated MNPs was studied.•CV adsorption follows pseudo 2nd order kinetics and fitted with Freundlich isotherm.•SDS modified nanosorbents showed Langmuir adsorption capacity of 166.6 mg g−1.

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 (R2 = 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.

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