Comparison Between Sorption and Sono-Sorption Efficiencies, Equilibriums and Kinetics in the Uptake of Direct Red 23 from the Aqueous Solutions


Oğuz E., Bire M., Nuhoğlu Y.

WATER AIR AND SOIL POLLUTION, cilt.227, 2016 (SCI İndekslerine Giren Dergi)

Özet

Using ZnO nanoparticles, comparisons between sorption and sono-sorption efficiencies, equilibrium and kinetics in Direct Red 23 have been researched under the various experimental conditions. Pseudo-second-order model was practiced for the experimental data. The mechanism of the dye uptake was clarified based on the analyses of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Brunauer-Emmett-Teller (BET) surface area and total pore volume of the nanoparticles were obtained. The highest Direct Red 23 (DR23) removal efficiencies by sorption and sono-sorption processes were determined as 78.6 and 96.8 %, respectively. Experimental data have been evaluated according to Langmuir, Freundlich and Dubinin-Radushkevich. The mean energies of sorption and sono-sorption processes were calculated to be 16.22 and 25.41 kJ/mol, respectively. Arrhenius equation was used to calculate the activation energies. Delta H degrees and Delta G degrees values indicated that sorption and sonosorption processes were endothermic processes. But, negative free energy values of Delta G degrees indicated that sorption and sono-sorption processes were favoured at high temperatures.