Journals / Eskişehir Technical University Journal of Science and Technology A - Applied Sciences and Engineering / 2016 / Cilt: 17 - Sayı: 4
ADSORPTION KINETICS OF Cd2+ IONS ONTO MgPz THIN FILM
- Pages
- 622–632
- DOI
- —
Abstract
A (2,3,7,8,12,13,17,18-Octakis(4-tert-butylbenzylthio)-porphyrazinato)Mg(II) functionalized quartz crystal microbalance sensor has been developed for the detection of trace Cd2+ions in water samples. The quartz crystal microbalance results indicated that the MgPz coated sensor exhibited high sensitivity, stability and selectivity for the detection of Cd2+ in aqueous solution. The lowest detection limit can reach 10 mg/ml Cd2+ in aqueous solution, which resulted in the frequency shift of ~ 150 Hz. The observed adsorption data were analyzed using four adsorption kinetic models; the Elovich equation, Ritchie’s equation, pseudo first- and second-order equations. Results show that the linear regression analysis with respect to pseudo-second-order rate equation generates a straight line that best fit to the data of adsorption of Cd2+ on Pz film.