Abstract: This work essentially involves the investigation of the adsorption of dibenzothiophene (DBT) using styrene based molecularly imprinted polymer (MIP) as adsorbent. Polymerization of the MIP was achieved by employing DBT as the template molecule, styrene as functional monomer, divinylbenzene as cross-linker, 1,1'-azobiscyclohexanecarbonitrile and benzene as the initiator and porogen, respectively. Structural and textural properties of the product were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetry, and nitrogen adsorption. The results indicated that the adsorption capacity increased from (10.44 to 33.65) mg/g for the MIP and from (5.68 to 10.34) mg/g for the non imprinted polymer (NIP) with an increase in initial DBT concentration from (100 to 500) mg/L. It was determined that the MIP exhibited high recognition selectivity and binding affinity to template DBT over benzothiophene (BT). Furthermore, the MIP could be reused five times without loss of performance. The mechanism of adsorption of DBT onto MIP was found to follow Langmuir isotherm, suggesting that adsorption takes place at specific homogeneous sites and no further adsorption takes place at the site which has been occupied by a template molecule.
Template and target information: dibenzothiophene, DBT
Author keywords: Desulfurization, dibenzothiophene, molecularly imprinted polymer, adsorption, Langmuir isotherm