화학공학소재연구정보센터
Journal of Colloid and Interface Science, Vol.506, 197-206, 2017
Fabrication of In2S3/Zn2GeO4 composite photocatalyst for degradation of acetaminophen under visible light
A novel indium trisulfide/zinc germinate (In2S3/Zn2GeO4) composite was developed via a co-precipitation hydrothermal method. The as-prepared composite was characterized in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectroscopy (DRS). Zn2GeO4 nanorods work as the main photocatalyst while In2S3 nanoparticles deposited on them acts as the photosensitizer. The resulting In2S3/Zn2GeO4 heterogeneous photocatalyst not only has enhanced visible light absorption, but also improved photo-generated charge transfer efficiency with remarkably high efficiency in decomposing acetaminophen (APAP). The composite photocatalyst with the mass ratio of 30% In2S3 showed the best activity for APAP degradation under visible light, with performance far superior to that of In2S3, nitrogen-doped titanium dioxide (N-TiO2), Degussa P25, and Zn2GeO4. The influences of various parameters (i.e., catalyst dosage, solution pH, and initial concentration of APAP) and background interference (humic acid (HA) and bicarbonate (HCO3-)) on the photodegradation efficiency for APAP were also discussed. The mechanistic studies revealed that holes and superoxide radicals are mainly involved in the photodegradation of APAP by In2S3/Zn2GeO4 composite. A probable reaction mechanism of APAP degradation under visible light over In2S3/Zn2GeO4 heterojunction was proposed. (C) 2017 Published by Elsevier Inc.