| dc.description.abstract | Iron oxides and ferrite-supported zeolites have been successfully used in the cheap and environmentally
friendly removal of organic pollutants such as antibiotics. In this study, the adsorption of Oxytetracycline
hydrochloride (OTC-HCL) on zeolite/Fe3O4 particles synthesized from natural Manisa-Gördes clinoptilolite
by co-precipitation method was investigated in the batch system at 298–323 K. Various parameters
such as pH, initial antibiotic concentration, adsorbent dosage, contact time, stirring speed and temperature
were examined and optimum parameters were determined according to experimental data.
Adsorption isotherms were investigated with Langmuir, Freundlich, Dubinin-Radushkevich (D-R),
Temkin models. Kinetic constants were determined according to pseudo first order, pseudo second order,
intraparticle diffusion and Elovich models. OTC-HCL adsorption on zeolite/Fe3O4 best fitted to the
Langmuir isotherm and pseudo second order kinetic models. The maximum adsorption capacity of zeolite/
Fe3O4 was determined as 83.33 mg/g at 323 K. Adsorption of OTC-HCL on zeolite/Fe3O4 occurred
spontaneously and endothermic. Physicochemical characterization of zeolite/Fe3O4 was performed
before and after adsorption, by N2 adsorption-desorption, XRD, FTIR, SEM-EDX, XPS, TEM analyses.
Magnetic properties of zeolite/Fe3O4 were determined by VSM analysis. The BET specific surface area
of zeolite/Fe3O4 decreased after adsorption of OTC-HCL. VSM and SEM-EDX results showed that zeolite/Fe3O4 had superparamagnetic property and OTC-HCL adsorbed on zeolite/Fe3O4 successfully. | tr |
