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

Author(s): Şerife Parlayıcı, Kübra Tuna Sezer, Erol Pehlivan*

Journal Name: Current Analytical Chemistry

Volume 16 , Issue 7 , 2020

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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.

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Article Details

VOLUME: 16
ISSUE: 7
Year: 2020
Page: [880 - 892]
Pages: 13
DOI: 10.2174/1573411015666191114143128
Price: $65

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