In this present study, a fluidized-bed crystallization (FBC) process as novel method was used to fabricate bimetallic Fe-Co catalyst supported on waste silica for the photo-Fenton-like (PFL) degradation of Methylene Blue (MB) and Reactive Red 195 (RR195) dye. Under the optimum conditions of initial pH of 3.0, 3.0 mM of H2O2, and 1.0 g L-1 of FBC-derived Fe-Co/SiO2 catalyst (fFCS), the maximum response for the decoloration and mineralization efficiencies of 20 mg L-1 of MB in 60 min were 100 and 65%, respectively. Compared to the impregnated Fe-Co/SiO2 catalyst, the fFCS catalyst exhibited comparable decoloration and mineralization efficiencies, and relatively lower metal leaching for both iron and cobalt. The catalysts were characterized by Fourier Transform Infrared spectroscopy, Energy Dispersive X-ray spectroscopy and Scanning Electron Microscopy. The results show the successful incorporation of iron and cobalt on the surface of the SiO2 support material. Additive ions greatly affected MB degradation due to scavenging effect. fFCS showed poor catalytic reusability toward MB degradation and mineralization. The catalytic reusability of fFCS was improved using NaOH as a desorption agent. On the other hand, the decoloration efficiency predicted by the Box-Behnken design (BBD) model was 88.3% under the optimized operation conditions. The actual RR195 decoloration efficiency was very close to the predicted value indicating that BBD can efficiently be utilized to optimize RR195 degradation with fFCS under the PFL system. Moreover, the main reactive oxygen species involved on MB and RR195 degradation under the PFL system were O21 and •OH radicals.

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