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Nano-ZrO2/TiO2 Impregnated Orange Wood Sawdust and Peach Stone Shell Adsorbents for Cr (VI) Removal

[ Vol. 16 , Issue. 7 ]

Author(s):

Şerife Parlayıcı, Kübra Tuna Sezer and Erol Pehlivan*   Pages 880 - 892 ( 13 )

Abstract:


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.

Keywords:

Cr (VI) removal, kinetics, orange wood sawdust, peach stone shell, ZrO2-TiO2 nanoparticles, adsorption process.

Affiliation:

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



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