Şerife Parlayıcı, Kübra Tuna Sezer and Erol Pehlivan* Pages 880 - 892 ( 13 )
Background: In this work, Cr (VI) adsorption on nano-ZrO2๏TiO2 impregnated orange wood sawdust (Zr๏Ti/OWS) and nano-ZrO2๏TiO2 impregnated peach stone shell (Zr๏Ti/PSS) was investigated by applying different adsorption parameters such as Cr (VI) concentrations, contact time, adsorbent dose, and pH for all adsorbents.
Methods: The adsorbents were characterized by SEM and FT-IR. The equilibrium status was achieved after 120 min of contact time and optimum pH value around 2 were determined for Cr (VI) adsorption. Adsorption data in the equilibrium is well-assembled by the Langmuir model during the adsorption process.
Results: Langmuir isotherm model showed a maximum adsorption value of OWS: 21.65 mg/g and Zr๏Ti/OWS: 27.25 mg/g. The same isotherm displayed a maximum adsorption value of PSS: 17.64 mg/g, and Zr๏Ti/PSS: 31.15 mg/g. Pseudo-second-order kinetic models (R2=0.99) were found to be the best models for describing the Cr (VI) adsorption reactions.
Conclusion: Thermodynamic parameters such as changes in ΔG°, ΔH°, and ΔS° have been estimated, and the process was found to be spontaneous.
Cr (VI) removal, kinetics, orange wood sawdust, peach stone shell, ZrO2-TiO2 nanoparticles, adsorption process.
Department of Chemical Engineering, Konya Technical University, Campus, 42079 Konya, Department of Chemical Engineering, Konya Technical University, Campus, 42079 Konya, Department of Chemical Engineering, Konya Technical University, Campus, 42079 Konya