Addressing such limitations of traditional photocatalysts as poor visible light absorption, substantial electron-hole recombination, and inefficient reactive oxygen species (ROS) generation is crucial. In this paper, oxygen vacancies (OVs) rich Bi 2 MoO 6 (BMO)/ZnSe S-scheme heterojunction was successfully prepared using a simple and mild solvothermal method. The introduction of OVs effectively shortened the band gap and increased the visible light absorption range. The mechanism of inducing OVs into BMO by adapting the concentration of surfactants was uncovered using both experimental and DFT simulation results. OVs-BMO/ZnSe exhibited an enhanced charge transfer capacity because OVs facilitated the formation of a rapid electron transfer pathway at the heterojunction interface. The synergistic effect of OVs and S-scheme heterojunction could effectively inhibit the recombination of photogenerated carriers. Its degradation efficiency and turnover frequency per wattage of light (TOF/P) reached 92.1% and 854.98 × 10 -10 (mol·g −1 ·J -1 ), respectively, during the low power LED white light-driven photocatalytic degradation of 50mg/L TC. The high value of TOF/P demonstrated its practical application potential in comparison with some other reported photocatalysts. Liquid Chromatography-Mass Spectrometry (LC-MS) characterization and ECOSAR simulation results indicated that OVs promoted the generation of ROS, in which ·O–2, 1 O 2 and h + significantly reduced the toxicity of intermediate products.
Jun Li,Chaofeng Wang,Shuilin Wu,Zhenduo Cui,Yufeng Zheng,Zhaoyang Li,Hui Jiang,Shengli Zhu,Xiangmei Liu
Currently, the global COVID-19 pandemic has significantly increased the public attention toward the spread of pathogenic viruses and bacteria on various high-frequency touch surfaces. Developing a self-disinfecting coating on a touchscreen is an urgent and meaningful task. Superlattice materials are among the most promising photocatalysts owing to their efficient charge transfer in abundant heterointerfaces. However, excess electronic defects at the heterointerfaces result in the loss of substantial amounts of photogenerated charge carrier. In this study, a ZnO Fe 2 O 3 superlattice nanofilm is designed via atomic layer deposition for photocatalytic bactericidal and virucidal touchscreen. Additionally, electronic defects in the superlattice heterointerface are engineered. Photogenerated electrons and holes will be rapidly separated and transferred into ZnO and Fe 2 O 3 across the heterointerfaces owing to the formation of Zn O, Fe O, and Zn Fe covalent bonds at the heterointerfaces, where ZnO and Fe 2 O 3 function as electronic donors and receptors, respectively. The high generation capacity of reactive oxygen species results in a high antibacterial and antiviral efficacy (>90%) even against drug-resistant bacteria and H1N1 viruses under simulated solar or low-power LED light irradiation. Meanwhile, this superlattice nanofilm on a touchscreen shows excellent light transmission (>90%), abrasion resistance (10 6 times the round-trip friction), and biocompatibility.
危险品化学品经营许可证（带存储）