Removal of Methylene Blue Dye Using Titanium Dioxide Photocatalyst
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Date
2018-06
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Addis Ababa University
Abstract
The application of dyes in different process industries will cause environmental impact. Thus, the need for
removal of dyes using an Advanced oxidation process is a vital issue to decrease the effect of dyes. An Advanced
oxidation process works based on the generation of hydroxyl radicals as an intermediate to takes place the
photocatalytic process under UV irradiation. Titanium dioxide was used in the photocatalytic decolorization
study of a dye i.e., methylene blue (MB). During Usage of this semiconductor as a photocatalyst for removal of
dye, physiochemical characteristics of the photocatalyst, the effect of the various process parameters like initial
dye concentration, catalyst loading, and UV irradiation time on the photodegradation of MB were investigated
using surface Response methodology. We obtain that the photocatalyst material has anatase composition of
100%, the specific surface area 55.64 m
2
/g and crystallite size of 39.93 nm respectively. In addition to this,
analysis on degradation of methylene blue (MB) as an organic dye pollutant upon photocatalytic oxidation of
TiO
2
nanoparticles under UV-light (393 nm) irradiation was optimized. According to analysis of variance
numerical optimization 94.89 % removal efficiency were predicted through adjusting the selected parameters
under specified or bounded conditions. Furthermore, the rate of dye degradation (reaction) kinetics were also
studied. The result indicates from first order Languier-Hinshewood kinetics model, is good fitting with regression
coefficient of 97.93 %.
Description
Keywords
Methylene Blue Dye, Titanium Dioxide Photocatalyst