Photodegradation of Methylene Blue by LaFeO3/ZnO Nanocomposites under Visible and UV Light Irradiation

5th International Conference on Science & Engineering in Mathematics, Chemistry and Physics 2017

数学;化学;物理学

Afifah, Nur^1,2 ; Saleh, Rosari^1,2

Departemen Fisika, Fakultas MIPA, Universitas Indonesia, Kampus UI Depok, Depok

16424, Indonesia^1

Integrated Laboratory of Energy and Environment, Fakultas MIPA, Universitas Indonesia, Kampus UI Depok, Depok

16424, Indonesia^2

关键词: Hexagonal wurtzite structure;    Initial concentration;    Orthorhombic structures;    Photocatalytic performance;    Photocatalytic process;    Photodegradation of methylene blue;    UV-light irradiation;    X-ray fluorescence spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/820/1/012022/pdf
DOI  :  10.1088/1742-6596/820/1/012022

来源: IOP

【 摘 要 】

In this study, LaFeO3/ZnO nanocomposites with different molar ratios of ZnO (0.1, 0.3, 0.5, and 1) have been prepared using the sol-gel method. The structural and elemental analyses of the samples were measured by X-ray diffraction (XRD) and X-ray fluorescence (XRF) spectroscopy. XRD results showed that the synthesized samples exhibited an orthorhombic structure of LaFeO3and a hexagonal wurtzite structure of ZnO. However, the ZnO hexagonal wurtzite structure could not be detected below the ZnO molar ratio of 0.5. The presence of ZnO on the nanocomposites was confirmed using XRF measurements. The results revealed that the XRF spectra of the samples consisted of La, Fe, and Zn atoms. The photodegradation of methylene blue (MB) using LaFeO3/ZnO nanocomposites was then monitored under visible and UV light irradiation. The photodegradation results showed that the presence of LaFeO3/ZnO nanocomposites could degrade the MB solution. The highest MB degradation was found in the presence of ZnO at a molar ratio of 0.5. All of the LaFeO3/ZnO nanocomposites showed better photocatalytic performance than did LaFeO3nanoparticles alone. Furthermore, several parameters, such as the effect of catalyst dose, initial concentration of MB, and various radical scavengers, were also measured to obtain the maximum condition and the main active species involved in the photocatalytic process.