Photocatalytic decolouration of 2, 4-dinitrophenol by modified metal oxides/β-CD nanocomposites under UV-A light irradiation Online publication date: Thu, 25-Aug-2016
by P. Velusamy; S. Rajalakshmi
International Journal of Environment and Waste Management (IJEWM), Vol. 17, No. 3/4, 2016
Abstract: The photocatalytic decolouration of 2, 4-dinitrophenol (DNP) in aqueous solution by modified metal oxides (MOs = TiO2 and ZnO)/β-cyclodextrin (β-CD) has been investigated under visible light irradiation and the results are compared with bare MOs. The MOs and their modified forms are characterised by UV-DRS, PXRD and FE-SEM analyses. The obtained results show that β-CD does not affect the crystalline phase of MOs. The photocatalytic decolouration depends on various processing parameters like initial concentration of DNP, irradiation time, the amount of the catalysts used and pH of the medium. The rate of photocatalytic decolouration of DNP follows the pseudo-first order kinetics. COD results show that the DNP molecules are mineralised in acidic pH. From the results, it has been concluded that β-CD forms inclusion complex with DNP and adsorbed on metal oxide surfaces to enhance the photocatalytic decolouration of DNP.
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