The influence of narrow optical gap silver oxide on zinc oxide nanoparticles produced by microwave-assisted colloidal synthesis: photocatalytic studies

8th International Conference on Physics and its Applications

Prakoso, S.P.^1 ; Paramarta, V.^1,2 ; Tju, H.^1,2 ; Taufik, A.^1,2 ; Saleh, R.^1,2

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

16424, Indonesia^1

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

16424, Indonesia^2

关键词: Colloidal synthesis;    Concentration ratio;    Degradation of organic dyes;    Diffuse reflectance spectroscopy;    Microwave assisted;    P-n heterojunctions;    Photocatalytic activities;    UV-light irradiation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/776/1/012051/pdf
DOI  :  10.1088/1742-6596/776/1/012051

来源: IOP

【 摘 要 】

This paper reports a photocatalytic study on wide band gap zinc oxide (ZnO) incorporated by narrow band gap silver oxide (Ag2O), namely Ag2O/ZnO nanocomposites, which were prepared by colloidal synthesis with microwave supports. The Ag2O/ZnO nanocomposites were prepared with three different molar ratios (MR) of Ag2O to ZnO (MR: 0.25, 0.5 and 0.75). In order to confirm qualitatively the concentration ratio of Ag2O in ZnO, crystal phase intensity ratio was executed by peak indexing from x-ray diffraction. The Ag2O/ZnO nanocomposites properties were further investigated using diffuse reflectance spectroscopy. The nanocomposites were tested for the degradation of organic dyes solutions under visible and UV light irradiations. The photocatalytic activity of Ag2O/ZnO nanocomposites under visible light increased with increasing molar ratio of Ag2O to ZnO, while the opposite trends observed under UV light irradiation. The improvement of photoabsorption together with photocatalytic activities might be suspected due to the p-n heterojunction structure in Ag2O/ZnO nanocomposites. The corresponding mechanism will be discussed in detail.