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- Title
Comparison Between Sorption and Sono-Sorption Efficiencies, Equilibriums and Kinetics in the Uptake of Direct Red 23 from the Aqueous Solutions.
- Authors
Oguz, Ensar; Bire, Murat; Nuhoglu, Yasar
- Abstract
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. Δ H° and Δ G° values indicated that sorption and sono-sorption processes were endothermic processes. But, negative free energy values of Δ G° indicated that sorption and sono-sorption processes were favoured at high temperatures.
- Subjects
DYES &; dyeing; SORPTION; AQUEOUS solutions; ZINC oxide; X-ray diffraction; SCANNING electron microscopy
- Publication
Water, Air & Soil Pollution, 2016, Vol 227, Issue 8, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-016-2970-4