Modified zeolite with transition metals Cu and Fe for removal of methylene blue from aqueous medium: Mass spectrometry study

Resumo

© 2015 BCREC UNDIP. All rights reserved.Textile industries are one of the main sources of water pollution. Wastewater containing dyes present a serious environmental problem because of its high toxicity and possible accumulation in the environment. In this work were explored the characteristics of removal of methylene blue dye employing zeolites modified with transition metals (Cu, Fe). The zeolites with iron or copper were prepared by using Naγ and Naβ zeolites as precursors, replacing part of ion sodium for copper or iron ions through the ion exchange method. All materials were characterized by several analytical techniques, in order to gain information about the structure and catalytic activity. Modified zeolites showed a remarkable activity in H2O2 decomposition and in the discoloration an organic dye in aqueous medium. ESI-MS studies of the methylene blue oxidation showed that the oxidation of the dye occurs via a Fenton type system in which∗OH radicals are formed in situ and added to the ring structure of the organic substrate. In addition, modification of the zeolite with transition metal proved to be an interesting pathway to produce efficient catalysts for the oxidation of organic molecules, i.e. dyes in aqueous media.

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