Al,Fe,Ni-pillared bentonite in catalytic wet peroxide oxidation of textile dye Acid Yellow 99

In this work catalytic performance of Al,Fe and Al,Fe,Ni-pillared bentonite was studied in the heterogeneous catalytic wet peroxide oxidation (CWPO) of textile dye Acid Yellow 99 used as a model compound. Pillared bentonites were synthesized using the bentonite from Mečji Do, Serbia and the pillaring solutions contained the different molar ratios of Al3+, Fe3+ and Ni2+ cations: a) 90 % Al, 10% Fe (AlFe10-PILC), b) 85% Al, 10% Fe, 5% Ni (AlFe10Ni5-PILC), and c) 90 % Al, 5% Fe, 5% Ni (AlFe5Ni5-PILC). The XRD, chemical and FTIR analysis and nitrogen physisorption at -196ºC were used for the characterization of the obtained samples. All results of the characterization confirmed successful pillaring. Degree of decolorization of dye containing aqueous solution was monitored using UV-Vis spectroscopy. The experiments were performed using solution with initial concentration of 50 mg dm-3 at 60 °C with respect to the catalyst and H2O2 amount. The catalytic degradation for all investigated catalysts followed the first order kinetics. Among the investigated materials AlFe10Ni5-PILC was found to be the most promising one for CWPO of AY99. These investigation are proof of concept that Al,Fe,Ni-pillared bentonite are applicable in CWPO