Advisor(s)
Abstract(s)
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-1, CH2O2 = 17.8
g L-1, Ccat = 2.5 g L-1, 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.
Description
Keywords
4-nitrophenol Advanced oxidation process Clay-based catalyst CWPO Kinetic modeling Wastewater treatment
Citation
Kalmakhanova, Marzhan Seitovna; Diaz de Tuesta, Jose Luis; Massalimova, Bakytgul Kabykenovna; Gomes, Helder Teixeira (2020). Pillared clays from natural resources as catalysts for catalytic wet peroxide oxidation: characterization and kinetic insights. Environmental Engineering Research. ISSN 1226-1025. 25:2, p. 186-196