构建具有双通道电荷转移路径的 Bi2MoO6/CoOx/Au 系统以增强四环素降解,Catalysis Science & Technology

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构建具有双通道电荷转移路径的 Bi2MoO6/CoOx/Au 系统以增强四环素降解
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2022-08-16 , DOI: 10.1039/d2cy01224c
Tongyu Han ₁ , Yigang Chen ₂ , Haifeng Shi _{1,

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Affiliation

在发展环境友好型光催化技术的过程中，提高光生电子-空穴对的分离效率是一项艰巨的挑战。在此，通过光沉积法成功地将不同类型的助催化剂Au和CoO _x负载在Bi ₂ MoO ₆ (BMO)纳米片的表面。三元BMO/CoO _x /1.5Au复合材料显示出增强的四环素（TC）降解率，是纯BMO的2.75倍。光催化性能的显着提高可归因于两种助催化剂的协同作用。在 Au 和 CoO _{x的帮助下}，光催化体系增强了可见光吸收能力，并构建了双通道加速电子和空穴的转移，从而抑制了光生载流子的复合。值得注意的是，该光催化剂具有优异的稳定性，经过五次循环后仍能保持较高的活性。同时，光致发光分析（PL）和时间分辨光致发光光谱（TRPL）表明该系统促进了电荷转移并延长了载流子的寿命。该研究为设计实用且高效的光催化剂以去除有机污染物提供了见解，并为构建电荷转移双通道以促进电荷分离提供了新的思路。

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Construction of a Bi2MoO6/CoOx/Au system with a dual-channel charge transfer path for enhanced tetracycline degradation

In the development of environment-friendly photocatalytic technology, improving the separation efficiency of photogenerated electron–hole pairs is an arduous challenge. Herein, different types of cocatalysts Au and CoO_x were successfully loaded on the surface of Bi₂MoO₆ (BMO) nanosheets through the photodeposition method. The ternary BMO/CoO_x/1.5Au composite displayed an enhanced degradation rate of tetracycline (TC), which was 2.75 times higher than that of pure BMO. The significantly improved photocatalytic performance could be attributed to the synergistic effect of the two cocatalysts. With the assistance of Au and CoO_x, the photocatalytic system enhanced the visible light absorption capacity and constructed dual channels to accelerate the transfer of electrons and holes, thus suppressing the recombination of photogenerated carriers. Noticeably, the photocatalyst possessed excellent stability, and could still maintain a high activity after five cycles. Meanwhile, photoluminescence analysis (PL) and time-resolved photoluminescence spectroscopy (TRPL) demonstrated that the system promoted charge transfer and prolonged the lifetime of carriers. This research provides insights into designing practical and efficient photocatalysts to remove organic pollutants and sheds new light on constructing charge transfer dual-channel for boosting charge separation.

更新日期：2022-08-16

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