Palladium-Supported Zirconia-Based Catalytic Degradation of Rhodamine-B Dye from Wastewater

Palladium-Supported Zirconia-Based Catalytic Degradation of Rhodamine-B Dye from Wastewater

The catalytic activity of Pd/ZrO2 was studied in terms of the degradation of rhodamine-B dye in the presence of hydrogen peroxide. Pd/ZrO2 was prepared by impregnation method, calcined at 750 °C and characterized by XRD, SEM and EDX. The catalyst showed good catalytic activity for dye degradation at...

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Bibliographic Details
Published in:Water (Basel) 2021-06, Vol.13 (11), p.1522
Main Authors: Jabeen, Salma, Sufaid Khan, Muhammad, Khattak, Rozina, Zekker, Ivar, Burlakovs, Juris, Rubin, Sergio S. dC, Ghangrekar, Makarand Madhao, Kallistova, Anna, Pimenov, Nikolai, Zahoor, Muhammad, Khan, Gul Shahzada
Format: Article
Language:eng
Subjects:
Aqueous solutions
Catalysts
Catalytic activity
Color removal
Degradation
dye
Dyes
Exothermic reactions
Free energy
Gibbs free energy
heterogeneous catalyst
Hydrogen peroxide
Isotherms
Kinetics
Metal oxides
Palladium
Pollutants
Reaction kinetics
Rhodamine
rhodamine-B
Scanning electron microscopy
thermodynamics
Wastewater
Water treatment
X-rays
Zirconia
Zirconium dioxide
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Summary:The catalytic activity of Pd/ZrO2 was studied in terms of the degradation of rhodamine-B dye in the presence of hydrogen peroxide. Pd/ZrO2 was prepared by impregnation method, calcined at 750 °C and characterized by XRD, SEM and EDX. The catalyst showed good catalytic activity for dye degradation at 333 K, using 0.05 g of the catalyst during 5 h. The reaction kinetics followed the pseudo-first order kinetics. The Freundlich, Langmuir and Temkin isotherms were applied to the data and the best fit was obtained with Freundlich isotherm. Thermodynamic parameters, like ΔH, ΔG and ΔS were also calculated. The negative values of ΔH (−291.406 KJ/mol) and Gibbs free energy (ΔG) showed the exothermic and spontaneous nature of the process. The positive ΔS (0.04832 KJ/mol K) value showed suitable affinity of catalyst for dye degradation. The catalyst was very stable, active and was easily separated from the reaction mixture by filtration. It can be concluded from the results that the prepared catalyst could be effectively used in dyes degradation/removal from water subjected to further validation and use for various dyes.
ISSN:2073-4441
2073-4441