Immobilization of Cr-MIL-101 over the NiO/13X zeolite nanocomposite towards ultrasound-assisted destruction of organic dyes in aqueous media

Abstract

The present research focuses on the fabrication and application of the Cr-MIL-101@NiO/13X as a novel sonocatalyst nanocomposite. The characterization study of the prepared samples was carried out by employing techniques including FTIR, XRD, FESEM, AFM, EDAX, and X-ray dot-mapping. The fabricated nanocomposite was applied for the sonodestruction of organic dyes in the aqueous media. All of the dependent reactions were performed under the optimized conditions following by the UV–vis analysis to monitor the destruction progress. The extent of sonocatalytic potency of the Cr-MIL-101@NiO/13X nanocomposite was investigated versus the H2O2-associated destruction of methylene blue (MB), rhodamine B (RhB), and methyl orange (MO) as prevalent organic dyes under the ultrasonic irradiation. In addition, several influential parameters such as contact time, initial dye concentration, catalyst amount, H2O2 concentration, scavenger type, and process type and their impact on the destruction of the MB, RhB and MO were evaluated. Also employing the first order model, the reaction kinetic was surveyed. The values of 0.0323 min−1 and 21.4551 min were attained for the rate constant (k) and the half-life (t1/2) for the destruction of MB in the Cr-MIL-101@NiO/13X/US/H2O2 system. Moreover, considering the gathered details, the significant performance of OH as a radical scavenger emanated from H2O2 during sonocatalytic destruction procedure is vividly proved. Besides, to challenge the destruction potential of the new nanocomposite and to show the effective combination of its components, the sonocatalytic function of the bare 13X and NiO/13X were studied under the equivalent conditions and the subsequent results were precisely reported.