Modified Zeolite with Transition Metals Cu and Fe for Removal of Methylene Blue from Aqueous Medium: Mass Spectrometry Study

Abstract

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 NaY 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.

Effect of copper on textural and acidic properties of hierarchical nanocrystalline ZSM‐5

“…It is due to the lower dispersion of copper in the structure when loaded with higher concentration, whereas these particular diffraction peaks of crystalline phases associated with copper were found to be indistinct in HCu(0.2 M)NZ. This observation is due to lower concentration of the copper and/or high dispersion of cations on the surface and/or in the pore walls of zeolites, which would not be easily observed by XRD analysis 29 . The diffraction peaks indicate that the size distribution of the zeolite samples is given in Table 1, which is calculated using Scherrer equation.…”

Catalytic Oxidation of Methylene Blue by Use of Natural Zeolite-Based Silver and Magnetite Nanocomposites

“…Lopes et al studied different zeolites as catalysts for MB decolorization and used numerous transitional metals to modify them. For instance, NaY and Naβ zeolites were modified into Y-Fe and Y-Cu, β-Fe and β-Cu, respectively [32]. The main finding was that despite the fact that the surface area was higher for Y-Fe and Y-Cu than for β-Fe and β-Cu, the cavity size being microporous for the former prevented the diffusion of MB molecules within the pores, which lowered the efficiency of the oxidation, whereas the cavity size for the latter, being mesoporous, enhanced the catalytic oxidation.…”

Synthesis and Characterization of Cu Decorated Zeolite A@void@Et-PMO Nanocomposites for Removal of Methylene Blue by a Heterogeneous Fenton Reaction

“…-1 related to the symmetric stretch vibrational modes of Si-O-Si and Si-O-Al groups[28], indicating the remain of zeolite A. Furthermore, additional several peaks, of which the spectra region in 2925-2850cm -1 and at 1410cm -1 and at 1160cm -1 , are attributed to the C-H vibrations, -CH2CH2-, respectively.…”