Using Ag/Ag2O/SnO2 Nanocomposites to Remove Malachite Green by a Photocatalytic Process

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

数学;化学;物理学

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

Departemen Fisika, Fakultas MIPA-Universitas Indonesia, Depok

16424, Indonesia^1

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

16424, Indonesia^2

关键词: Microwave-assisted methods;    Photocatalytic activities;    Photocatalytic performance;    Photocatalytic process;    Pseudo-first order kinetics;    Tetragonal structure;    UV-vis spectroscopy;    Visible-light irradiation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/820/1/012017/pdf
DOI  :  10.1088/1742-6596/820/1/012017

来源: IOP

【 摘 要 】

Silver/silver oxide/tin oxide nanocomposites of various weight ratios were synthesized using a microwave-assisted method. The Ag/Ag2O:SnO2nanoparticle weight ratios used were 25:75, 50:50, and 75:25. All samples were characterized using X-ray diffraction, UV-Vis spectroscopy, Differential Scanning Calorimetry and Thermogravimetric Analysis (TGA). The Ag/Ag2O/SnO2nanocomposites contained cubic structures provided by the Ag and Ag2O and tetragonal structures provided by the SnO2. The silver resulted in surface plasmon resonance (SPR) at a wavelength of about 435 nm. The silver oxide material was transformed into pure Ag at a temperature of about 370 °C The photocatalytic activity was tested on the degradation of malachite green (MG) from an aqueous solution. The results showed that Ag/Ag2O/SnO2at a ratio of 50:50 exhibited the best photocatalytic performance for degrading MG under visible-light irradiation. The degradation of MG using Ag/Ag2O/SnO2nanocomposites followed pseudo first-order kinetic reactions, and electron holes were found to be the main species acting on the degradation process.