Engineering continuous charge steps in multiple 2D-semiconductor hetero-interface for rapidly photocatalytic dye-degradation and disinfection
Engineering continuous charge steps in multiple 2D-semiconductor hetero-interface for rapidly photocatalytic dye-degradation and disinfection
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用于快速光催化降解和消毒的多个2D-半导体异质界面的工程连续电荷步骤
DOI：
10.1016/j.apsusc.2022.153348
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发表时间：
2022-04
影响因子：
6.7
通讯作者：
W. Lu;Tianhua Ding;Na Lu;Jiaming Zhang;Kui Yun;P. Zhang;Zhenyi Zhang
中科院分区：
文献类型：
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作者：
W. Lu;Tianhua Ding;Na Lu;Jiaming Zhang;Kui Yun;P. Zhang;Zhenyi Zhang
开发廉价、高效的半导体光催化剂对于实现环境修复的目标具有重要意义。然而，半导体光催化剂中光生载流子的快速复合仍然是一个巨大的障碍。在这方面的贡献，我们铺平了“连续的电荷步骤”在多个二维半导体异质界面通过有序组装的二维半导体的g-C3 N4，SnS 2，和TiO 2纳米片（NS）通过使用一个简易的超声分散和随后的热处理。这三种二维纳米结构之间的能带结构匹配使得它们的有序复合物（g-C3 N4/SnS 2/TiO 2NS）具有两种宽的二维异质界面构型（g-C3 N4/SnS 2/TiO 2和TiO 2/g-C3 N4/SnS 2），并具有更大的光捕获范围。时间分辨光致发光谱结果表明，上述两种异质界面结构都能诱导形成“连续电荷台阶”，加速界面电子转移.因此，在紫外可见光照射下，合成的g-C3 N4/SnS 2/TiO 2NSs对罗丹明B的光催化降解表现出4.2-7.5倍的增强作用。在模拟太阳光照射30 min后，g-C3 N4/SnS 2/TiO 2NS对大肠杆菌的光催化杀菌效率可达99.99%以上。该研究为合理设计三元异质结构光催化剂开辟了一条新的途径。
The development of inexpensive and high-efficient semiconductor photocatalysts is of great significance for achieving the goal of environmental remediation. However, the fast recombination of the photoinduced charge-carriers in semiconductor photocatalysts still poses a huge obstacle. In this contribution, we pave “continuous charge steps” in multiple 2D-semiconductor hetero-interface through an orderly assembly of 2D semiconductors of g-C3N4, SnS2, and TiO2nanosheets (NSs) by using a facile ultrasonic dispersion and subsequent heat treatment. The matchable energy band structures between the above three 2D NSs allows their orderly composite (g-C3N4/SnS2/TiO2NSs) to possess two kinds of broad 2D hetero-interface configurations (g-C3N4/SnS2/TiO2and TiO2/g-C3N4/SnS2) with the extended light-harvesting range. The time-resolved photoluminescence spectroscopy results prove that both of the above hetero-interface configurations could induce the formation of “continuous charge steps” to accelerate the interfacial electron transfer. Thus, upon UV–visible light irradiation, the as-synthesized g-C3N4/SnS2/TiO2NSs exhibited 4.2–7.5 fold enhancement for the photocatalytic degradation of Rhodamine B. Notably, the photocatalytic disinfection efficiency of the g-C3N4/SnS2/TiO2NSs forEscherichia colicould be over 99.99% after simulated sunlight irradiation for only 30 min. This study opens up a new path for sensible design of ternary heterostructure photocatalyst with continuous charge steps towards an extraordinary photocatalytic activity.