Preparation and investigation of M-MWCNT nanocomposite by hydrothermal method for Pb(II) ions adsorption

In this present work, MWCNTs modifed NiFe2O4 NPs (M-MWCNT) were successfully fabricated based on a hydrothermal route, and then utilized to Pb(II) sorption from an aqueous solution. Te M-MWCNT was characterized and analyzed by SEM, TEM, FTIR, XRD, and VSM techniques. TEM image demonstrated that the size of NiFe2O4 nanoparticles in the structure of MWCNT was 20 nm. VSM results indicated that the M-MWCNT with saturation magnetization (Ms) value of 7 emu/g would have a fast magnetic response. According to X-ray data the average crystal sizes of the pure NiFe2O4 and M-MWCNT are 21.62 and 7.25 nm, respectively. Te sorption kinetics, isotherms, thermodynamic and regeneration performance for lead ((Pb(II)) ions were evaluated. Te M-MWCNT can efectively remove Pb(II) from aqueous solution at optimum pH of 5.5. Based on the Langmuir model, the maximum saturated adsorbed amount (qmax) of Pb(II) was up to 85.12 mg/g. Te kinetic characteristic was appropriate for pseudo 1st order model expression, and the isothermal characteristic can be described via Longmuir model. Te data obtained from the thermodynamic study show that the Pb(II) sorption using M-MWCNT nanocomposite was a spontaneous, exothermic and physisorption process with a good regeneration performance.