Abstract
The present study investigates the effect of different catalyst preparation methods (namely, co-precipitation, COP; sol gel, SG; urea gelation, UG; and solution combustion, SC) on the characteristics and performance of a non-noble metal based supported heterogeneous catalyst (CuO/CeO2) for the treatment of synthetic wastewater. To test their efficacy, two wastewater solutions were selected, i.e. inorganic: sulfide-laden wastewater, S2− concentration = 250 mg/L and organic: phenolic wastewater (phenol and o-cresol with total phenolic concentration = 1500 mg/L). The fresh catalyst samples were characterized for particle size distribution using sieves (25–125 µm), transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, BET surface area and ICP-AES. The recovered catalysts were also subjected to different analyses to understand the changes in the catalyst during reaction. Maximum oxidation of sulfide and phenolic compounds occurred with H2O2 in the presence of the catalyst prepared by SC method. This method also resulted in the most stable catalyst showing low amount of active metal leaching (Cu = 2% and Ce = 0.2%) as compared to COP (25.8, 7.0%), SG (38.3, 31.3%) and UG (39.6, 26.5%) methods, for which Cu and Ce leaching were ~ 26–40 and 7–31%, respectively.
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Acknowledgements
The authors acknowledge the support of the Sophisticated Analytical Instrument Facility (SAIF), Indian Institute of Technology Bombay (IIT Bombay), Central Facility, Department of Chemistry, IIT Bombay and Metallurgical Engineering & Materials Science Department, IIT Bombay, for helping us in the catalyst characterization.
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Gupta, D., Garg, A. Effect of the preparation method on the catalytic activity of the heterogeneous catalyst CuO/CeO2 for the oxidative degradation of sulfide and phenolic compounds. Reac Kinet Mech Cat 124, 101–121 (2018). https://doi.org/10.1007/s11144-017-1318-4
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DOI: https://doi.org/10.1007/s11144-017-1318-4