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

Authors :
Ivar Zekker
Juris Burlakovs
Rozina Khattak
Anna Kallistova
Gul Shahzada Khan
Salma Jabeen
Sergio Rubin
Makarand M. Ghangrekar
Muhammad Sufaid Khan
Nikolai V. Pimenov
Muhammad Zahoor
Source :
Water, Vol 13, Iss 1522, p 1522 (2021), Water, Volume 13, Issue 11
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

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.

Details

Language :
English
ISSN :
20734441
Volume :
13
Issue :
1522
Database :
OpenAIRE
Journal :
Water
Accession number :
edsair.doi.dedup.....2a1226d3965bc28a0c0006da456b3816