Author(s): Mrabet, Imane El ; Santos, Bebiana L. C. ; Tanji, Karim ; Rombi, Elisabetta ; Parpot, Pier ; Fonseca, A. M. ; Zaitan, Hicham ; Neves, Isabel C.
Date: 2025
Persistent ID: https://hdl.handle.net/1822/94942
Origin: RepositóriUM - Universidade do Minho
Subject(s): Bimetallic-zeolite nanocatalysts; Fenton-like oxidation; Azorubine dye; Response surface methodology
Solutions containing equal concentrations of each metal ion pair (Zn/Fe, Co/Fe, Ni/Fe) were simultaneously added to the zeolite NaY using the ion-exchange method. The resulting bimetallic-zeolites were used as heterogeneous catalysts for the Fenton-like reaction for azorubine dye degradation. The optimization of the reaction parameters was assessed using the Box-Behnken design by studying the influence of H2O2 concentration, catalyst mass, and temperature. For each catalyst, the reaction kinetic was well fitted to the pseudo-first-order model. The best result was obtained with the (ZnFe) NaY catalyst obtaining 98 % of degradation within 60 min, with a rate constant of 0.0424 min1, followed by (CoFe)NaY and (NiFe)NaY, which achieved 89 % and 81 % of removal after 90 min, with rate constants of 0.0246 min1 and 0.0162 min1, respectively. Finally, the highest efficiency of (ZnFe)NaY opens up its applicability for large-scale wastewater treatment, using low-cost materials which further underscores its commercial potential.
