2D/2D p-n Heterojunctions of CaSb2O6/g-C3N4for Visible Light-Driven Photocatalytic Degradation of Tetracycline

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 CaSb2O6/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 CaSb2O6. 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 CaSb2O6, 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(center dot)OH,(center dot)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.