Fabrication of New Synthetic Routes for Functionalized Si-MCM-41 Materials as Effective Adsorbents for Water Remediation

Abstract

The removal of toxic dyes (Methyl Violet, MV; Congo Red, CR; and Malachite Green, MG, respectively) from water using Si-MCM-41 functionalized with aspartic acid (APA), polyethylenimine (PEI), and β-cyclodextrin (β-CD) developed through new facile synthetic routes is reported here. The successful functionalizations of Si-MCM-41 were examined by means of TGA, solid-state 13C CP MAS NMR spectra, FTIR, XRD, nitrogen sorption, FESEM, and TEM. Beside this, the sorption behavior of those sorbents using sorbates is determined by considering some factors like the pH of the medium, contact time, temperature of the medium, concentration of the dye medium, sorbent dose, and agitation speed. The kinetics data fitted a pseudo-second-order model. It is noticed that the Langmuir equation yields an accurate description of these sorption data, implying that monolayer adsorption took place in all sorption processes. The proficient sorption capacities of these adsorbents (qm = 374.89 mg g–1 for MV on Si-MCM-41–APA, qm = 458....