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

[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.

[发布机构] Departemen Fisika, Fakultas MIPA-Universitas Indonesia, Depok; 16424, Indonesia^1;Integrated Laboratory of Energy and Environment, Fakultas MIPA-Universitas Indonesia, Depok; 16424, Indonesia^2

[效力级别] 化学

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