Synthesis and Application of Amin-modified Fe3O4@MCM-41 Core-shell Magnetic Mesoporous for Effective Removal of pb2+ ions from Aqueous Solutions and Optimization with Response Surface Methodology

In this study, a selective, fast and novel magnetic mesoporous silica sorbent Fe3O4@MCM-41-NH2,was synthesized, functionalized and has been used for the removal of Pb+2 ions from aqueous solution.The characteristics of the Fe3O4@MCM-41-NH2 sorbent was investigated by XRD, VSM, SEM, TEM,BET, and FT-IR. The response surface methodology (RSM) based on central composite design (CCD)was utilized for estimating the effects of parameters, namely contact time (min), pH, the quantity ofadsorbent (g) and initial concentration of Pb+2. The quadratic model was used as the best model forguessing variables. The results of the analysis of variance for this model were obtained with a highF-value (50.28), very low P-value (<0.0001) and non-significant lack of fit (0.2251). The maximumadsorption capacity was obtained at 46.08 mg/L. Fitting equilibrium data with different isothermmodels shows that Freundlich isotherm was the best-fitted model. The pseudo-second-order modelwas the best model for fitting experimental data.

Keywords:

Adsorption , Central Composite Design , Magnetic Mesoporous Silica Sorbent , Pb+2 , Removal