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A Study of adsorption Isotherms in Photodegradation of Methyl Orange using Synthesized ZnO Nanoparticles

International Journal of Applied Chemistry
© 2017 by SSRG - IJAC Journal
Volume 4 Issue 3
Year of Publication : 2017
Authors : Lucy J. Chebor, Lusweti Kituyi, Dickson Andala
10.14445/23939133/IJAC-V4I5P103
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How to Cite?

Lucy J. Chebor, Lusweti Kituyi, Dickson Andala, "A Study of adsorption Isotherms in Photodegradation of Methyl Orange using Synthesized ZnO Nanoparticles," SSRG International Journal of Applied Chemistry, vol. 4,  no. 3, pp. 15-19, 2017. Crossref, https://doi.org/10.14445/23939133/IJAC-V4I5P103

Abstract:

Adsorption of the dye over different adsorbents can be monitored through Langmuir and Freundlich adsorption isotherm models and feasibility of the process predicted in both cases. This study aimed at assessing the nature of adsorption isotherms resulting from photo degradation of methyl orange dye using ZnO nanoparticles. Precipitation technique was used to synthesize ZnO nanoparticles for two samples L1 and L2 and characterized using power X-ray diffraction (PXRD), fourier transform infra-Red (FTIR), scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX) methods of analysis. The EDX results showed elemental composition of ZnO nanoparticles which showed 54% Zn, 44.07% O and 1.93% Mn impurities for L1 and 55.34% Zn, 42.3% O and 2.37% Mn impurities for L2. The coefficients of correlation for ZnO nanoparticles for both sunlight and fluorescent irradiation for Langmuir expression (R2) were all high. Thus the Langmiur expression provided better fit for the experimental data of photocatalytic degradation of methyl orange using ZnO nanoparticles than Freundlich expression implying surface monolayer mechanism. The values obtained for Lagergren second order plot of methyl orange adsorption under sunlight and fluorescent conditions were greater than those of first order. This suggests that the process followed the pseudo second order kinetics. Future studies should focus on the nature of adsorption isotherms in case where stabilizers are used to enhance the efficiency of nano ZnO in the removal of dyes from water waters.

Keywords:

Adsorption Isotherms, Photodegradation, nanoparticles, organic dyes.

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