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Marzhan Seitovna Kalmakhanova,Jose Luis Diaz de Tuesta,Bakytgul Kabykenovna Massalimo,Helder Teixeira Gomes 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.2
Pillared clays with Zr and Fe/Cu/Zr polycations have been prepared from natural clays found in large deposits of Kazakhstan and assessed as catalysts for the catalytic wet peroxide oxidation (CWPO), using 4-nitrophenol (4-NP) as model compound. The performance of the catalysts was followed by measuring the concentration of 4-NP, H₂O₂ and the total organic carbon (TOC), considering C4-NP = 5 g L<SUP>-1</SUP>, CH₂O₂ = 17.8 g L<SUP>-1</SUP>, Ccat = 2.5 g L<SUP>-1</SUP>, initial pH = 3.0 and T = 50°C. At those selected conditions, the pillared clays showed higher activity than natural clays in the CWPO of 4-NP. The conversion of the model pollutant was complete when Fe/Cu/Zr-PILCs were used, with the TOC removal reaching 78.4% after 24 h with the best Fe/Cu/Zr-PILC. The H₂O₂, 4-NP and TOC time-evolution was well described by a kinetic model based on TOC lumps in three blocks, considering the initial TOC (corresponding to 4-NP), the production of oxidizable intermediates and the formation of refractory products.