Adsorptive CuO/CuAl2O4 nanoparticles for the separation of aqueous methyl orange

Menon, Samvit G and Choudhari, KS and Kulkarni, Suresh D and Santhosh, C (2017) Adsorptive CuO/CuAl2O4 nanoparticles for the separation of aqueous methyl orange. Nano Hybrids and Composites, 12. pp. 21-32. ISSN 2297-3400

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A simple method for the separation of aqueous methyl orange, an azo dye, is reported, where CuO/CuAl2O4 nanoparticles synthesised by co-precipitation method were 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 was determined by BET nitrogen adsorption method. To study the nature of surface charge, the isoelectric point of the material was determined using the pH drift method following which the rate of decolouration was studied for pH 5 and pH 7. The experiments in the absence of light show that adsorption of the dye is prevalent even up to 6h leading to 86% decolouration. A methanolic extraction was effective for quantitative separation of adsorbed dye from CuO/CuAl2O4 nanoparticles regenerating them for reuse. The presence of methyl orange in the extracted solution and on the nanoparticles at various stages was verified by UV- Visible and FT-IR spectroscopic methods. The extent of adsorption was quantified and found to be as high as 86%. The catalyst after complete extraction of methyl orange (MO), could be reused for the decolouration. Stability of the nanoparticles after reuse was verified by the close match of XRD patterns of the pure and reused CAO which show no significant changes in its crystal structure. The separation method shown here can be extended for the removal of other azo dyes from textile effluents.

Item Type: Article
Uncontrolled Keywords: Methyl orange; Adsorption; Azo-dyes; CuO; CuAl2O4; Nanoparticles.
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Library
Date Deposited: 20 Apr 2017 03:43
Last Modified: 20 Apr 2017 03:43

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