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Abstract: The effect of heat attachment method parameters such as: sonication time, dosage of catalyst, immobilization temperature and type of solvent were investigated for enhancement of photocatalytic activity of immobilized ZnO nanoparticles on glass plate. Photocatalytic activity of immobilized ZnO was tested in the removal of C.I. Acid Red 88 (AR88) as a model contaminant from textile industry. Results indicated that sonication time, dosage of catalyst and immobilization temperature were very effective on photocatalytic activity of immobilized ZnO on glass plate and using ethanol instead of water at preparation of immobilized ZnO did not show any considerable effect. In another step, the effect of operational parameters such as light intensity and initial concentration of AR88 on the removal of AR88 were investigated with immobilized ZnO on glass plate. Results indicated that removal rate decreased with increasing initial concentration of AR88 but increased with increasing UV light intensity. [Copyright &y& Elsevier]

Abstract: The kinetics of decolorization of Malachite Green (MG) as a model cationic dye from textile industry, by US/UV/H2O2 process, was investigated with nonlinear regression analysis. The experimental results indicated that the decolorization kinetics of MG in this process fit well by pseudo-first order kinetics. With nonlinear regression analysis a model was developed for pseudo-first order constant (k ap) as a function of operational parameters such as initial concentrations of H2O2 (25–600mgl−1) and MG (1.82–9.87mgl−1), temperature (294–307K) and power density (0.049–0.16Wml−1) as following: For electrical energy cost evaluation, the figure-of-merit electrical energy per order (E EO) was estimated from experimental and theoretical data. The results show that E EO is very sensitive to the mentioned operational parameters. [Copyright &y& Elsevier]