Adsorptive interaction of 4-aminobiphenyl with mesoporous MCM-41

摘要

In this work, mesoporous silica-based MCM-41 was synthesised, and its adsorptive interaction with carcinogenic aromatic amine 4-aminobiphenyl (4-ABP) was studied. pH, MCM-41 dose, 4-ABP concentration, adsorption time and temperature were selected as process parameters for this purpose. Kinetic experimental data were fitted to pseudo-first-order and pseudo-second-order kinetic models to evaluate the adsorption kinetics. Further, adsorption rate controlling mechanism was investigated using intra-particle diffusion model. Langmuir, Freundlich, Temkin and D-R isotherm (Dubinin-Radushkevich) models were used to represent the adsorption equilibrium data. Gibbs free energy, entropy and enthalpy have also been determined to interpret the adsorption mechanism. MCM-41 exhibited 525 m(2) g(-1) BET surface area with pore volume of 0.85 cm(3) g(-1) and pore diameter of 3.21 nm. Kinetic data were best represented by the pseudo-second-order kinetic model. The adsorption equilibrium data were best fitted by Freundlich and Dubinin-Radushkevich (D-R) isotherms.