Bohang Zhang, Canxiang Fang, Jing Ning, Rong Dai, Yang Liu, Qiao Wu, Fuchun Zhang, Weibin Zhang, Shixue Dou, Xinghui Liu
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引用次数: 0
摘要
由于γ - bi2moo6 (BMO)具有独特的层状钙钛矿结构和优异的导电性,引起了人们的广泛关注。然而,电子-空穴对的简单重组限制了它的实际应用。为了解决这一问题,我们成功地用简单的水热法制备了价cd2 +掺杂的BMO (Cd‐BMO),用于降解磺胺甲恶唑(SMZ)和罗丹明B (RhB)。结果发现,虽然Cd - BMO的带隙增大,但Cd - BMO的降解效率明显高于BMO。8% Cd - BMO具有更小的粒径和更大的比表面积,其优异的降解效率可归因于其快速的电荷分离效率、低的电荷转移电阻和低的电子-空穴对复合速率。重复实验和离子溢出实验证明,8% Cd - BMO具有良好的稳定性和环保性。理论模拟表明,由于BMO的结合能降低,Cd向BMO体系提供了电子。8%的Cd - BMO样品可以在降解过程中提供合适的电带边缘,以产生主要的活性自由基。这项工作不仅为实际降解提供了8% Cd - BMO的潜在候选材料,而且为设计更好的光催化剂提供了思路。
Unusual aliovalent Cd doped γ-Bi2MoO6 nanomaterial for efficient photocatalytic degradation of sulfamethoxazole and rhodamine B under visible light irradiation
Due to γ-Bi2MoO6 (BMO) has attracted considerable attention because of its unique layered perovskite structure and excellent electrical conductivity. However, the easy recombination of electron–hole pairs limits its practical application. To address this issue, we successfully prepared aliovalent Cd2+ doped BMO (Cd-BMO) by using a simple hydrothermal method for the degradation of the sulfamethoxazole (SMZ) and Rhodamine B (RhB). The result found that the degradation efficiency of Cd-BMO is significantly higher than that of BMO, despite an increase in the bandgap after the introduction of Cd2+. The superior degradation efficiency of 8% Cd-BMO, with a smaller particle size and larger specific surface area, can be attributed to its fast charge separation efficiency, low charge transfer resistance, and low rate of electron–hole pair recombination. Repeated and ion spillover experiments prove that 8% Cd-BMO shows good stability and environmental protection. Theoretical simulation demonstrates that Cd offers electrons to the BMO system due to the decreased binding energy of BMO. The 8% Cd-BMO sample can provide a suitable electric band edge for generating dominant active radicals during degradation. This work not only provides a potential candidate of 8% Cd-BMO for practical degradation but also sheds light on the design of superior photocatalysts.