Adsorption of Methyl Violet 2B and Direct Red 28 From Single and Binary Solution Using a Magnetic Zeolite/TiO2/Fe3O4 Nanocomposite

Abstract

In this research, a magnetic adsorbent called ZTF was synthesized by combining zeolite and TiO2. Various analytical techniques including SEM, EDS, BET, FTIR, XRD, Zeta potential, and VSM were utilized to characterize the structure of ZTF. In order to understand the pollutant removal performance of the ZTF, Methyl violet 2B (MV-2B) and Direct red 28 (DR-28) were chosen as target pollutants in adsorption experiments. The effects of the contact time, initial dye concentration, ZTF amount, temperature, ionic strength and initial pH of the solution on the adsorption of MV-2B and DR-28 were studied. The removal of MV-2B and DR-28 were found to be 94.5% and 96.8% at the original pH, with a ZTF amount of 1.5 g/L, an initial dye concentration of 20 mg/L, a contact time of 60 min, and at a temperature of 23 °C respectively. The experimental data indicated that Freundlich isotherm and pseudo second order model were suitable for the adsorption of MV-2B and DR-28. Moreover, the adsorption of DR-28 and MV-2B were found to be exothermic and spontaneous at the studied temperature range. Furthermore, the study also explored the removal of MV-2B and DR-28 in a binary system. The results showed that ZTF exhibited suitable performance for the removal of both dyes in the binary system.