Liu C, Han Z, Feng Y, Dai H, Zhao Y, Han N, Zhang Q, Zou Z. Ultrathin Z-scheme 2D/2D N-doped HTiNbO
5 nanosheets/g-C
3N
4 porous composites for efficient photocatalytic degradation and H
2 generation under visible light.
J Colloid Interface Sci 2021;
583:58-70. [PMID:
32977193 DOI:
10.1016/j.jcis.2020.09.018]
[Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 08/22/2020] [Accepted: 09/06/2020] [Indexed: 12/29/2022]
Abstract
To realize highly efficient utilization of solar energy for solving problems of environmental pollution and energy shortage has attracted increasing attention. Herein, a two-step exfoliation-restacking process was employed to construct ultrathin Z-scheme two-dimensional (2D)/2D N-doped HTiNbO5 nanosheets/g-C3N4 (RTCN) heterojunction composites with the increased specific surface areas, showing the enhanced photocatalytic performance for rhodamine B (RhB) degradation and hydrogen (H2) generation under visible light irradiation. A 2D/2D heterojunction structure was formed between N-doped H+-restacked HTiNbO5 nanosheets (N-RTNS) and g-C3N4, which was beneficial for the effectively spatial separation of photogenerated charge carriers. The improved photocatalytic activities may be attributed to the synergistic effects of the increased specific surface area, N-doping and 2D/2D heterostructure. The active species of holes (h+), hydroxyl (•OH) and superoxide (•O2-) radicals contributed to RhB photodegradation. A Z-scheme photocatalytic mechanism was proposed over RTCN-2 composite, showing dual advantages of the highly redox ability and efficient charge carrier separation.
Collapse