Removal of Methyl Violet 2B and Direct Black 22 From Single and Binary System Using a Magnetic Zeolite/MgO/Starch/Fe3O4 Nanocomposite

Abstract

In this study, magnetic zeolite (FSM-Zeo) was prepared using starch, magnesium oxide and Fe₃O₄. It was characterized by BET, FTIR, SEM, EDS, XRD, Zeta potential and VSM analyses. FSM-Zeo was used to remove methyl violet (MV-2B) and direct black 22 (DB-22) in single and binary dye solutions. In single system, the removal of DB-22 and MV-2B was 72% and 73% respectively using a FSM-Zeo amount of 0.4g/100mL, an initial dye concentration of 10mg/L, a contact time of 90min and a temperature of 22°C. The results indicated that DB-22 and MV-2B adsorption followed the pseudo second order model, while isotherm studies confirmed Freundlich and Langmuir models for MV-2B and DB-22 adsorption on FSM-Zeo, respectively. In binary system, DB-22 removal was found to be 85.6%, 97.9% and 80.5% at initial 10/10, 10/20 and 20/10 (DB-22/MV-2B) concentrations, while MV-2B removal was found to be 59.9%, 61.4% and 67.3%.The adsorption of DB-22 was enhanced in the presence of MV-2B, and higher DB-22 removal was obtained compared to the single dye solution. There was a synergistic effect due to the interaction between DB-22 and MV-2B, which promoted the adsorption of DB-22 on FSM-Zeo.