Adsorptive CuO/CuAl₂O₄ Nanoparticles for the Separation of Aqueous Methyl Orange

Abstract:

A simple method for the separation of aqueous methyl orange, an azo dye, is reported, where CuO/CuAl2O4 nanoparticles synthesisedby co-precipitation methodwere used as the adsorbent. The presence of cubic CuAl2O4 (CAO) and monoclinic CuO phase of this composite material was confirmed by X-Ray diffraction and its specific surface area wasdetermined by BET nitrogen adsorption method.To study the nature of surface charge, theisoelectric point of the material was determined using the pH drift methodfollowing which the rate of decolouration was studied forpH 5and pH 7. Theexperiments in the absence oflight show that adsorption of the dye is prevalent even up to 6h leading to 86% decolouration.A methanolic extraction was effectivefor quantitative separation ofadsorbed dye fromCuO/CuAl2O4 nanoparticles regenerating them for reuse. The presence of methyl orange in the extracted solution and on the nanoparticles at various stages was verified byUV-Visible and FT-IR spectroscopic methods.The extent of adsorption was quantified and found tobe as high as 86%. The catalyst aftercomplete extraction ofmethyl orange (MO),could be reused for the decolouration. Stability of the nanoparticles after reuse was verified by the closematch of XRD patterns ofthe pure and reused CAOwhich show no significant changes in itscrystal structure. The separation method shown here can be extended for the removal of other azo dyesfrom textile effluents.

• Periodical: Nano Hybrids and Composites (Volume 12)
• Pages: 21-32
• DOI: https://doi.org/10.4028/www.scientific.net/NHC.12.21
• Online since: November 2016
• Authors: Samvit G. Menon, K.S. Choudhari, Suresh Kulkarni*, C. Santhosh
• Keywords: Adsorption, Azo-Dyes, CuAl₂O₄, CuO, Methyl Orange, Nanoparticles

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