Magnetic Solid Phase Extraction Based on Multiwalled Carbon Nanotubes for Water Remediation from Bismarck Brown-Y: Isotherm Study

Abstract

This study utilized enhanced magnetic derivatives of multi-walled carbon nanotubes, specifically MWCNT-Tris@Fe₃O₄, MWCNT-H@Fe₃O₄, MWCNT-Tetra@Fe₃O₄, and MWCNT-G@Fe₃O₄, to extract and eliminate Bismarck Brown-Y (BB-Y) using the solid phase extraction technique. The solid phases were studied by Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESE), Transmission Electron Microscopy (TEM), zeta potential measurement, and X-ray Diffraction (XRD). The optimal extraction conditions were attained with a sorbet weight of 0.01gm and an initial concentration of 600 mg/l of BB-y for every phase. The pH of MWCNT-Tris@Fe3O4 was 6, whereas it was 10 for the other phases. Additionally, the volume of dye utilized in this study was 25 ml. The optimal flow rate for the eluting solvent was determined to be 1.5 mL.min-1 also, this study tested different eluents and their volumes. DMSO was shown to be the most effective eluent, with 2.5 ml giving the highest percentage of recovery. The current study focused on determining adsorption capacity using Langmuir and Freundlich isotherm models under ideal conditions. The Langmuir model showed that the maximum adsorption capacities (qmax) were 1724.138, 1818.182, 1886.793, and 1960.784 mg/g for MWCNT-tris@Fe3O4, MWCNT-H@Fe₃O₄, MWCNT-Tetra@Fe₃O₄, and MWCNT-G@Fe₃O₄, respectively. The study's results indicate that the adsorption of BB-y employing magnetic derivatives of multi-walled carbon nanotubes as an adsorbent is chemisorption.