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.

为了解决环境污染和能源短缺的问题，实现太阳能的高效利用已引起越来越多的关注。本文中，采用两步剥落-堆积法构建比表面积增大的超薄Z型二维（2D）/ 2D N掺杂HTiNbO ₅纳米片/ gC ₃ N ₄（RTCN）异质结复合材料。在可见光照射下增强了若丹明B（RhB）降解和氢（H ₂）生成的光催化性能。在N掺杂的H ⁺堆积的HTiNbO ₅纳米片之间形成2D / 2D异质结结构（N -RTNS）和gC ₃ N ₄，这对光生电荷载流子的有效空间分离是有益的。改善的光催化活性可以归因于增加的比表面积，N-掺杂和2D / 2D异质结构的协同效应。孔的活性种（H ⁺），羟基（OH•）和超（•Ø ₂ ^- ）基团促进了罗丹明B光降解。提出了一种在RTCN-2复合材料上的Z型光催化机理，显示出高氧化还原能力和有效载流子分离的双重优势。