Simple one-step synthesis process of novel MoS2@bentonite magnetic nanocomposite for efficient adsorption of crystal violet from aqueous solution

Abstract

Toxic dye effluents from textile wastewater can cause hazardous effects on human health. Hence, the removal of these effluents is crucial. In this study, a novel MoS2@bentonite magnetic nanocomposite (M-MoS2@bentoniteNC) was synthesized using a new, simple, and one-step process to remove crystal violet (CV). The samples of the M-MoS2@bentoniteNC were characterized using field emission scanning electron microscopy, elemental mapping with energy-dispersive X-ray analysis, transmission electron microscopy, selected area diffraction, Fourier transform infra-red spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, Barrett-Joyner-Halenda and Brunauere-Emmette-Teller surface area analysis, thermogravimetric analysis, and vibrating-sample magnetometry techniques. The synthetic M-MoS2@bentoniteNC exhibited a sufficiently large Langmuir maximum adsorption capacity towards CV (384.61 mg g−1) and remarkable reusability (92.55 % CV removal in the third adsorption–desorption cycle). The adsorption isotherm results were best fitted using the Freundlich model, which refers to multilayer adsorption of CV onto the M-MoS2@bentoniteNC.