Ultrathin direct Z-scheme 2D/2D N-doped HTiNbO5 nanosheets/g-C3N4 porous composites for efficient photocatalytic degradation and H2 generation under visible light
Ultrathin direct Z-scheme 2D/2D N-doped HTiNbO5 nanosheets/g-C3N4 porous composites for efficient photocatalytic degradation and H2 generation under visible light
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超薄直接 Z 型 2D/2D N 掺杂 HTiNbO5 纳米片/g-C3N4 多孔复合材料，可在可见光下实现高效光催化降解和氢气生成
DOI：
10.1016/j.jcis.2020.09.018
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发表时间：
2021
影响因子：
9.9
通讯作者：
Zhigang Zou
中科院分区：
文献类型：
--
作者：
Chao Liu;Zitong Han;Yue Feng;Hailu Dai;Yefan Zhao;Ni Han;Qinfang Zhang;Zhigang Zou
实现太阳能的高效利用以解决环境污染和能源短缺问题已日益受到人们的重视。本文采用两步剥离-再堆积工艺，构建了比表面积增加的超薄Z-scheme二维(2D)/ 2dn掺杂htinbo5纳米片/g-C3N4（RTCN）异质结复合材料，在可见光照射下对罗丹明B （RhB）降解和氢（H2）生成的光催化性能增强。n掺杂H+叠合htinbo5纳米片（N-RTNS）与g-C3N4之间形成2D/2D异质结结构，有利于光生载流子的有效空间分离。光催化活性的提高可能是由于比表面积的增加、n掺杂和2D/2D异质结构的协同作用。活性的空穴（h+）、羟基（•OH）和超氧化物（•O2−）自由基有助于RhB的光降解。提出了RTCN-2复合材料的Z-scheme光催化机理，具有高氧化还原能力和高效载流子分离的双重优点。
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)/2DN-doped HTiNbO5nanosheets/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 betweenN-doped H+-restacked HTiNbO5nanosheets (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.