Adsorption of Pyridine onto Activated Montmorillonite Clays: Effect Factors, Adsorption Behavior and Mechanism Study

Abstract

Activated Montmorillonite was applied for the sorption of pyridine as a health-toxic substance. Fourier-transform Infrared spectroscopy (FTIR), zeta potential analysis, thermogravimetric analysis (TGA), N 2 physisorption analysis and X-ray diffraction (XRD) method were used to investigate the structure and composition of Montmorillonite. The batch sorption system was used to study the effect of different parameters on the adsorption. Results had shown that neutral pH had a significant effect on the sorption of pyridine; thermodynamic calculations indicated that the adsorption of pyridine over Montmorillonite was exothermic reaction and the equilibrium capacity was slightly increased by using H 2 SO 4 as activating agent by comparison with that obtained by using HCl and H 3 PO 4. Fitting the experimental data to isotherms models indicated that the experimental data were well fitted by Fowler Guggenheim isotherm models. Finally the results obtained by FTIR and TGA proved that the relative affinity of the pyridine toward the Montmorillonite was related to the electron donor-acceptor complexes that were formed between the basic sites (nitrogen or oxygen) and hydrogens (acidic site).

Synthesis and Characterization of Magnetic Nickel Ferrite-Modified Montmorillonite Nanocomposite For Cu (II) and Zn (II) Ions Removal From Wastewater

“…1e) in the spectrum of adsorbent after Cu (II) and Zn (II) ions are, respectively, assigned to Cu-O and Zn-O stretching vibrations. Moreover, the intensity and location of the Si-O vibrations of MMT tetrahedral layers that appeared in the fresh adsorbent at 1015 cm -1 and 1055 cm -1 were changed after ions adsorption indicating the binding of ions to the oxygen atoms present on the MMT surface as reported in [72]. The change in absorption intensity and the shift in wavenumber of functional groups could be attributed to the complexation between metal ions and binding sites (O of -OH group and O of Si-O groups) [73].…”