Degradation of bisphenol a using peroxymonosulfate activated by WO3@MoS2/Ag hollow nanotubes photocatalyst. (July 2019) - Zeng, Ying
Abstract: WO3 @MoS2 /Ag (HW@MA) hollow tubes were successfully engineered to photodegrade bisphenol A (BPA) combined with peroxymonosulfate (PMS) for the first time. XRD, XPS, TEM and SEM were conducted. The HW@MA tubes present excellent photocatalytic performance on the removal of BPA. The intermediate products of BPA were investigated by GC-MS analysis and the degradation pathway was proposed. To explore the transferred mechanism of photoproduced carriers, the electron paramagnetic resonance (EPR) technique was carried out. The results revealed that the superoxide radical (O2 − ), hydroxyl radical (OH), sulfate radical (SO4 − ) were the main active radicals. Moreover, the formed schottky junctions enhanced the separation efficiency of photoinduced electron-hole pairs. Besides, the effect of the photocatalysts' dosage, PMS concentration, pH of the initial solution and co-existing anions on the BPA degradation were investigated. Graphical abstract: WO3 @MoS2 /Ag hollow tubes were successfully engineered to photodegrade bisphenol A (BPA) combined with peroxymonosulfate (PMS) for the first time. Schottky junctions, formed at the interface of MoS2 nanosheets and Ag particles, enhanced the separation efficiency of photogenerated electron-hole pairs. O2 −, OH and SO4 − are the main active radicals. Image 1 Highlights: WO3 @MoS2 /Ag hollow tubes are synthesized by a facile hydrothermal and deposited method for the first time. WO3 @MoS2 /Ag hollow tubes possess large specific surface area. The formed Schottky junctions enhanced the separation efficiency of photoinduced carriers. PMS was activated by the WO3 @MoS2 /Ag hollow tubes to photodegrade BPA.