Open AccessPhotocatalytic degradation of methylene blue dye solution using different amount of ZnO as a photocatalyst
Author(s) -
H. A. Rafaie,
Nur Fitrahana Mohd Yusop,
Nurathira Faqihah Azmi,
Nur Syakirah Abdullah,
Nurul Infaza Talalah Ramli
Publication year - 2021
Publication title -
science letters
Language(s) - English
Resource type - Journals
ISSN - 1675-7785
DOI - 10.24191/sl.v15i1.11789
Subject(s) - photocatalysis , methylene blue , photodegradation , zinc , materials science , degradation (telecommunications) , nuclear chemistry , scanning electron microscope , powder diffraction , visible spectrum , photochemistry , chemistry , catalysis , metallurgy , organic chemistry , composite material , crystallography , telecommunications , optoelectronics , computer science
Zinc oxide (ZnO) powder was used as a photocatalyst for the photocatalytic degradation of methylene blue (MB) dye solution. In this study, different amount of ZnO (10, 20 and 30 mg) as photocatalyst was used to investigate the performance of photocatalytic degradation of MB dye solution. The morphology and structural properties of ZnO powder were studied by X-ray diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) techniques. The photocatalytic activities of the ZnO powder were investigated by degrading the MB dye solution under UV light irradiation at different amounts of ZnO photocatalyst. The percentage degradation of MB dye solution in the presence of 10 mg ZnO powder was found to be the highest at 96.2 % within 60 min irradiation compared to 20 and 30 mg of ZnO powder. The photodegradation rate constants, k obtained in this study were 0.0661, 0.0558, and 0.0507 min-1 for 10, 20, and 30 mg ZnO powder, respectively that follow the pseudo first-order reaction kinetics.
Keywords: Methylene blue, photocatalytic degradation, photocatalyst, Zinc Oxide