Gübbük, İlkay HilalGürfidan, LeylaErdemir, SerkanYılmaz, Mustafa2020-03-262020-03-2620120049-69791573-2932https://dx.doi.org/10.1007/s11270-011-1054-8https://hdl.handle.net/20.500.12395/28442In this study, p-tert-butylcalix[4]-aza-crown (CAC) immobilized sporopollenin (Sp) was used as a sorbent for the removal of Cu(II), Pb(II) and Zn(II) from aqueous media. Sporopollenin was firstly functionalized with 3-chloropropyltrimethoxysilane (CPTS) in order to obtain chloro-sporopollenin (Sp-Cl). The Sp-Cl was reacted subsequently with CAC yielding CAC-bonded sporopollenin (Sp-Cl-CAC). The new sorbent was characterized by infrared spectroscopy (FTIR), thermal analysis (TG/DTG) and scanning electron microscopy (SEM). The sorption properties of modified sorbent (Sp-Cl-CAC) are also investigated. The optimum pH values for the separation of metal ions from aqueous solution onto Sp-Cl-CAC were 5.0 for Pb(II) and Cu(II) and 5.5 for Zn(II). The maximum sorption capacities for Cu(II), Pb(II) and Zn(II) were 0.07 (4.44 mg g(-1)), 0.07 (4.58 mg g(-1)) and 0.14 (29.00 mg g(-1)) mmol g(-1), respectively. Sorption thermodynamic parameters of such as free energy (a dagger G (o)), enthalpy (a dagger H (o)), and entropy (a dagger S (o)) were evaluated.en10.1007/s11270-011-1054-8info:eu-repo/semantics/closedAccessSurface immobilizationThermodynamicCalixareneSorptionArticle223526232632Q2WOS:000304467000057Q2