Simultaneous visible-light-driven photocatalytic dye degradation and hydrogen production by zinc oxysulfide
Invited conference paper presented and published in conference proceedings



摘要Hydrogen (H2) is one of the most promising alternatives for fossil fuels due to its cleanness and high energy content. However, it is necessary to replace the recent fossil-based H2 production methods by sustainable ones. The discharge of dye-containing industrial wastewater, which leads to the negative ecological and health impacts on the natural environment and organisms, becomes a serious environmental issue. It is interesting to develop effective photocatalytic treatment to simultaneously degrade the massive dyes and produce H2.
In this study, zinc oxysulfide (ZnOS), was used for simultaneous visible-light-driven (VLD) photocatalytic dye degradation and H2 production. ZnOS was synthesized by co-precipitation and then calcination. The O:S ratio and calcination temperature were optimized to be 0.6:0.4 and 400 °C, respectively. The ZnO0.6S0.4 nanoparticles were found to be roughly spherical in size of 10-20 nm with band-gap energy of 2.03 eV. The activity of the ZnO0.6S0.4 was firstly determined by photocatalytic degradation of different reactive dyes under visible light irradiation. The highest decolorization rate was achieved for Reactive Violet 5 (RV5) among the tested dyes. Then, the VLD photocatalytic H2 production by ZnO0.6S0.4 was determined. In the presence of optimized sulfide/sulfite (S2-/SO32-) solution as the sacrificing agent, with 70.4 μmol g-1 of H2 was produced in 3 h.
Finally, the simultaneous VLD photocatalytic RV5 degradation and H2 production by ZnO0.6S0.4 were performed. The addition of RV5 to the system was found to facilitate a delayed enhancement of H2 production compared to that without RV5 addition, whereas the decolorization rate of RV5 was also enhanced. The enhancement in H2 production was dependent on the initial RV5 concentration. The delayed H2 enhancement was contributed by the organic intermediates from RV5 degaradtion. These results indicated the integrated ZnO0.6S0.4 system was stable and reliable for simultaneous dye degradation and H2 production.
著者Chu Ka Him, Wong Po Keung
會議名稱2019 International Symposium on Nanoscience and Nanotechnology in Environment
會議論文集題名2019 International Symposium on Nanoscience and Nanotechnology in Environment
出版社Shaanxi University of Science & Technology
頁次1 - 1
關鍵詞Photocatalysid, Dye degradation, Hydrogen production, Zinc oxysulfide

上次更新時間 2019-06-05 於 14:32