PBNP/g-Al2O3 como catalizador fenton-like: Influência do método de síntese

P. M. HAURE; L. I. DOUMIC; G. SALIERNO; C. P. RAMOS; M. A. AYUDE; M. CASSANELLO

Congreso; VIII Encontro sobre Aplicações Ambientais de Processos Oxidativos Avançados II Congresso Iberoamericano de Processos Oxidativos Avançados; 2015

Prussian Blue nanoparticles (PBNP) on -Al2O3 beads are prepared following different procedures. Two of the catalysts (B1 and B2) are synthesized by adsorbing the PBNP (ex-situ formed) onto the support and using different temperatures in the washing step.A third catalyst (B3) is prepared through a two-step impregnation process. The catalytic activity and stability of the samples are evaluated in Fenton-type oxidation of an azo dye at 343K, initial pH 3 and stoichiometric oxidant dose. The fresh and used catalysts are characterized by BET surface area, SEM, EDS, TEM, Mössbauer spectroscopy, total iron content and UV-vis spectrophotometry. The catalysts based on ?insoluble? Prussian Blue nanoparticles (B1 and B2) have shown better behavior in terms of stability.Moreover, washing the just-prepared catalysts at the reaction temperature (B2) avoids the release of non-desirable species into the treated solution. For all catalysts, complete discolouration is attained, azo dye molecules are partially oxidized and, for catalyst B2, 60% of TOC is removed. Reversible adsorption of reaction intermediates is demonstrated. Catalytic performance with the best synthesized catalyst (B2) is maintained upon thirteen successive 300min-cycles with 10% total iron leaching.