The construction of g-C3N4/Sm2+ doped Bi2WO6 2D/2D Z-scheme heterojunction for improved visible-light excited photocatalytic efficiency
The construction of g-C3N4/Sm2+ doped Bi2WO6 2D/2D Z-scheme heterojunction for improved visible-light excited photocatalytic efficiency
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DOI：
10.1016/j.seppur.2019.05.006
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发表时间：
2019-10-01
影响因子：
8.6
通讯作者：
Zhu, Tong
中科院分区：
文献类型：
--
作者：
Jin, Chongyue;Li, Zhilin;Zhu, Tong
为了进一步提高Bi2WO6的光催化效率，采用简单的溶剂热法制备了Sm掺杂的Bi2WO62D/2D Z型异质结(CN/Sm-BWO)复合g-C3N4。详细考察了g-C3N4偶联剂和Sm掺杂量对Bi2WO6光催化性能的影响。结果表明，g-C3N4偶联和Sm2+掺杂可以明显提高Bi2WO6的光催化性能。优化的15CN/0.1Sm-BWO样品在50min内光降解约90%的罗丹明B(RhB)，几乎是纯Bi2WO6的4.1倍。15CN/0.1Sm-BWO也表现出较高的稳定性。15CN/0.1Sm-BWO光催化性能的显著提高主要归因于g-C3N4和Bi2WO6之间的Z型异质结构和Bi2WO6中Sm2+掺杂的协同作用，从而保持了较高的氧化还原能力，并明显促进了电子-空穴对的分离。
To further promote the photocatalytic efficiency of Bi2WO6, g-C3N4 coupling with Sm doped Bi2WO6 2D/2D Z-scheme heterojunction (CN/Sm-BWO) composites were successfully constructed via a facile solvothermal method. The influences of the contents of g-C3N4 coupling and Sm dopants on the photocatalytic performance of Bi2WO6 were investigated in detail. The results showed that g-C3N4 coupling and Sm2+ doping can apparently improve the photocatalytic performance of Bi2WO6. There are about 90% of Rhodamine B (RhB) in 50 min being photodegraded over the optimal 15CN/0.1Sm-BWO sample, being almost 4.1 times higher than that of pure Bi2WO6. The 15CN/0.1Sm-BWO also exhibited high stability. The largely enhanced photocatalytic performance of 15CN/0.1Sm-BWO was mainly ascribed to the synergistic effect of the Z-scheme heterostructure between g-C3N4 and Bi2WO6, and Sm2+ doping in Bi2WO6, thus retaining the high redox capacity and apparently accelerating the separation of electron-hole pairs.