2D/2D p‐n Heterojunctions of CaSb 2 O 6 /g‐C 3 N 4 for Visible Light‐Driven Photocatalytic Degradation of Tetracycline

• Published in: European journal of inorganic chemistry Vol. 2020; no. 40; pp. 3852 - 3858
• Main Authors: Li, Yuanyuan, Shen, Jinfeng, Quan, Wenxuan, Diao, Yue, Wu, Meijun, Zhang, Bin, Wang, Yaoqiong, Yang, Dingfeng
• Format: Journal Article
• Language: English
• Published: 31.10.2020
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.202000635

Despite many attempts to build g‐C 3 N 4 based heterojunctions there are currently no systematic guidelines for designing such composites. Herein, we rationally designed and synthesized a novel CaSb 2 O 6 /g‐C 3 N 4 2D/2D heterojunction with ideal lattice matching. The as‐synthesized heterojunctions had superior visible light‐driven photodegradation toward tetracycline solution compared with those of pristine g‐C 3 N 4 and CaSb 2 O 6 . The corresponding maximum apparent kinetic rate constant was 0.01388 min –1 , which was approximately 2.4 and 53 times greater than those of g‐C 3 N 4 and CaSb 2 O 6 , respectively. Additionally, photoelectrochemical measurements indicated that the enhanced photocatalytic performance was attributed to generation of an internal electric field by the intimate contact p‐n heterojunction. The main reactive species were · OH, · O 2 – and h – are the dominate reactive species in the photocatalytic process. This study will inspire efforts to build 2D/2D heterojunction photocatalysts with efficient carrier separation and higher photocatalytic performance through structural chemistry or solid state chemistry analysis.