Synergistic introduction of oxygen vacancy and silver/silver iodide: Realizing deep structure regulation on bismuth oxybromide for robust carbon dioxide reduction and pollutant oxidation.
Saved in:
| Title: | Synergistic introduction of oxygen vacancy and silver/silver iodide: Realizing deep structure regulation on bismuth oxybromide for robust carbon dioxide reduction and pollutant oxidation. |
|---|---|
| Authors: | Jia, Xuemei1 (AUTHOR) xuemeijia@njust.edu.cn, Lin, Haili1 (AUTHOR), Cao, Jing1 (AUTHOR) caojing@chnu.edu.cn, Hu, Cheng1 (AUTHOR), Sun, Haoyu1 (AUTHOR), Chen, Shifu1 (AUTHOR) |
| Source: | Journal of Colloid & Interface Science. Oct2022, Vol. 624, p181-195. 15p. |
| Subjects: | Carbon dioxide reduction, Pollutants, Silver iodide, Bismuth, X-ray photoelectron spectroscopy, Silver, Carbon monoxide, Density functional theory |
| Abstract: | A bifunctional S-scheme BiOBr-based heterojunction with high effective CO 2 reduction and antibiotic TC removal under visible light was designed by the cooperative introduction of oxygen vacancies (OVs) and Ag/AgI, in which OVs acted as the charge transmission bridge to reduce the interface migration resistance of the charge meanwhile Ag/AgI served as cocatalyst to enhance the separation efficiency of carriers. [Display omitted] • Synergistic introduction of surface OVs and Ag/AgI realized deep structure regulation on BiOBr. • S-scheme Ag/AgI/BiO 1− x Br could preserve strong redox capacity of holes and electrons. • OVs as the charge transmission bridge reduced the interface migration resistance of the charge. • Ag/AgI as a cocatalyst enhanced the separation efficiency of carriers. • Ag/AgI/BiO 1− x Br displayed outstanding photoreactivity for CO 2 reduction and TC removal. To efficiently solve severe energy shortage and environmental pollution issues, step-scheme (S-scheme) photocatalytic system, as perfect photocatalyst with strong redox ability and swift separation efficiency of carriers, has been considered a feasible tactic. Herein, a novel S-scheme silver/silver iodide/bismuth oxybromide heterojunction with rich oxygen vacancies (OVs) (labeled as Ag/AgI/BiO 1− x Br) was in situ fabricated via a simple photodeposition-precipitation method. It was discovered that the obtained Ag/AgI/BiO 1− x Br heterojunction with the optimized molar ratio of silver/bismuth (Ag/Bi) at 0.4 presented excellent photocatalytic properties for carbon dioxide (CO 2) reduction (2.46 μmol g−1h−1 carbon monoxide (CO) and 1.25 μmol g−1h−1 methane (CH 4) generation) and antibiotic tetracycline (TC) removal (96.7%) even in actual waste water or in the presence of electrolytes. The enhanced performance of S-scheme Ag/AgI/BiO 1− x Br composite may be ascribed to the collaborative effect of OVs and silver/silver iodide (Ag/AgI), in which OVs acted as the charge transmission bridge for reducing the interface migration resistance of the charge and Ag/AgI served as a cocatalyst for enhancing the separation efficiency of carriers. Furthermore, a feasible photocatalytic mechanism was discussed via density functional theory calculation and in-situ X-ray photoelectron spectroscopy. This work not only demonstrated the synergistic application of OVs transmission bridge and Ag/AgI cocatalyst, but also provided a facile way to design high-efficiency and stable photocatalysts for energy production and environmental remediation. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Colloid & Interface Science is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
Be the first to leave a comment!
