Add time:08/07/2019         Source:sciencedirect.com

In the present work, the performance of photocatalytic removal of reactive blue 203 (RB203) using three different additive as photocatalyst: ZnO nanoparticles (ZnO (NPs)), multi wall carbon nanotubes and ZnO (NPs) stabilized on Functionalized multi wall carbon nanotubes (ZnO (NPs)/MWCNTs) was investigated. For this purpose, firstly the surface of multi wall carbon nanotubes (MWCNTs) were acidified using sulfuric acid and nitric oxide and then ZnO (NPs) was stabilized on the MWCNTs surface to form ZnO (NPs)/MWCNTs. The structural properties of the ZnO (NPs)/MWCNTs were studied by using the results of Scanning Electron Microscope analysis (SEM). In addition, the effects of various influencing factors such as pH, temperature, dye concentration, UV radiation time, UV intensity and photocatalysts dosage were investigated on photocatalytic removal of RB203. The maximum dye removal was obtained at optimum condition which was pH = 10, 20 min radiation time, 50 mm lamp distance from catalyst level, and the UV radiation intensity of 23 mW/cm2. This condition was created in 100 ml of synthetic wastewater having dye concentration of 20 mg/L and catalyst mass of 5 mg/L. This experiment was carried out for all three additives and the removal efficiencies of 19%, 85.4% and 99.1% were attained for the additives of MWCNTs, ZnO (NPs) and ZnO (NPs)/MWCNT, respectively.

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