Adsorption and kinetic studies for removal of basic dyes using pillared bentonites

Abstract

The aim of this work is to synthesize, characterize, and evaluate the influence of two pillared bentonite (PILC) viz. Iron pillared bentonite (Fe-PILC) and Aluminium Pillared bentonite (Al-PILC) on cationic dye removal. The PILCs were investigated using X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FT-IR), Brunauer-Emmer Teller (BET) analysis, Thermogravimetric analysis (TGA), and Scanning Electron Microscopy (SEM). The parent clay and synthesized PILCs are used as adsorbents for Malachite Green (MG) and Chrysoidine-Y (CY) dyes. In Al-PILC, maximum dye adsorption capacities at equilibrium were 90.080 mg g-1 for MG and 76.369 mg g-1 for CY, Whereas, in Fe-PILC, it were 60.518 mg g-1 and 57.041 mg g-1 for MG and CY, respectively. Parent clay as well as the pillared clays followed Freundlich isotherm model and PSO model.