Journal of Industrial and Engineering Chemistry, Vol.25, 199-206, May, 2015
Degradation kinetics for photocatalytic reaction of methyl orange over Al-doped ZnO nanoparticles
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Al-doped ZnO nanoparticles with different Al concentrations were prepared and employed as photocatalysts for the degradation of methyl orange. The samples were characterized by XRD, FE-SEM, XPS, BET, UV-vis DRS and photoluminescence techniques. The kinetic behavior could be described in terms of the Langmuir-Hinshelwood model. The adsorption equilibrium constant increased with increasing Al concentration and the reaction rate constant showed a maximum at 3% Al. It can be deduced that the enhancement of photocatalytic activity of ZnO by addition of Al could be attributed not to increase of surface area but to effective suppression of photoinduced electrons and holes.
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