Ti3C2辅助的Mo掺杂Zn0.5Cd0.5S双功能催化剂的制备及其光催化性能研究

牛杰; 王亮; 李春虎

doi:10.19906/j.cnki.JFCT.2023021

Ti₃C₂辅助的Mo掺杂Zn_0.5Cd_0.5S双功能催化剂的制备及其光催化性能研究

doi: 10.19906/j.cnki.JFCT.2023021

中国海洋大学化学化工学院, 山东青岛 266100

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E-mail: wangliang_good@163.com

中图分类号: X703
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- 被引次数: 0
出版历程
- 收稿日期: 2023-01-16
- 修回日期: 2023-02-28
- 录用日期: 2023-03-10
- 网络出版日期: 2023-03-24
- 刊出日期: 2023-10-10

Preparation and bifunctional photocatalytic properties of Mo-doped Zn_0.5Cd_0.5S assisted by Ti₃C₂

College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

摘要

摘要: 采用水热法制备了Mo掺杂的Zn_0.5Cd_0.5S并使其与Ti₃C₂纳米片复合，通过XRD、SEM、TEM、XPS、UV-vis DRS、荧光光谱和瞬态光电流表征方法分析了光催化剂的晶体结构、表面组成、微观形貌和光电性能。结果表明，Mo的掺杂改变了Zn_0.5Cd_0.5S的晶格和能带结构，Ti₃C₂的负载增加了光催化活性位点并加快了电子转移速率。在可见光照射下，通过降解四环素溶液同时产氢考察了光催化剂的活性。在Mo掺杂与负载Ti₃C₂的协同作用下，60 min内，四环素(TC)的降解率可达70%，氢气产量达883 μmol/(g·h)。自由基捕获实验证明，光催化降解过程的主要活性物质为光生空穴，产氢过程为光生电子。
- Zn_0.5Cd_0.5S /
- Mo掺杂 /
- Ti₃C₂ /
- 双功能光催化剂
Abstract: Mo-doped Zn_0.5Cd_0.5S was prepared and compounded with Ti₃C₂ nanosheets by hydrothermal method. The crystal structure, surface composition, microscopic morphology, and photoelectric properties of the photocatalysts were analyzed by XRD, SEM, TEM, XPS, UV-vis DRS, fluorescence spectroscopy, transient photocurrent methods. The results showed that the doping of Mo caused changes in the lattice structure of Zn_0.5Cd_0.5S, while the loading of Ti₃C₂ increased the photocatalytic active site and accelerated the electron transfer rate. The photocatalytic activity was investigated by degrading the tetracycline solution under visible light irradiation with simultaneous H₂ production. The results showed that with the synergistic effect of Mo doping and loaded Ti₃C₂, the degradation rate of tetracycline (TC) reached more than 70% within 60 min, while the H₂ yield reached 883 μmol/(g·h). The radical capture experiments proved that the main active substance for degradation was holes and for H₂ production was electrons.
- Zn_0.5Cd_0.5S /
- Mo doping /
- Ti₃C₂ /
- bifunctional photocatalyst

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FIG. 2708. FIG. 2708.

FIG. 2708. FIG. 2708.

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图 1 ZCS、ZCM₄S、ZCM₄ST₁₅的(a)XRD谱图和(b)局部放大图

Figure 1 (a) XRD patterns and (b) the magnified view of ZCS, ZCM₄S, ZCM₄ST₁₅

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图 2 (a) ZCS, (b) ZCM₄S的SEM照片, (c) Ti₃C₂, (d) ZCM₄ST₁₅的TEM照片, (e)ZCS, (f) ZCM₄ST₁₅的HRTEM照片

Figure 2 SEM images of (a) ZCS, (b) ZCM₄S, TEM image of (c) Ti₃C₂, (d) ZCM₄S T₁₅, HRTEM image of (e) ZCS, (f) ZCM₄ST₁₅

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图 3 ZCM₄ST₁₅的XPS能谱：(a)全谱, (b) Mo 3d, (c) Zn 2p, (d) Cd 3d, (e) S 2p, (f) Ti 2p

Figure 3 (a) XPS survey spectra, high-resolution of (b) Mo 3d, (c) Zn 2p, (d) Cd 3d, (e) S 2p, (f) Ti 2p of ZCM₄ST₁₅

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图 4 (a) ZCS、ZCM₄S和ZCM₄ST₁₅的紫外-可见漫反射吸收光谱, ZCS和ZCM₄S的(b)(αhν)^1/2与hν的关系图, (c)Mott Schottky曲线, (d)能带结构图

Figure 4 (a) UV-vis DRS spectras of ZCS, ZCM₄S and ZCM₄ST₁₅, (b) Plots of (αhν)^1/2 versus hν, (c) Mott Schottky plots, (d) band gap structure of ZCS and ZCM₄S

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图 5 ZCS、ZCM₄S和ZCM₄ST₁₅的(a)荧光发光光谱和(b)瞬态光电流图

Figure 5 (a) PL spectra and (b) transient photocurrent response of ZCS, ZCM₄S和ZCM₄ST₁₅

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图 6 三种催化剂的(a)光催化产氢效率和(b)光催化降解效率

Figure 6 (a) H₂ evolution and (b) degradation efficiency of three different photocatalysts

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图 7 ZCM₄ST₁₅的(a)产氢重复性实验和(b)降解重复性实验

Figure 7 (a) H₂ evolution and (b) degradation cycle experiment by ZCM₄ST₁₅

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图 8 ZCM₄ST₁₅的(a)光催化降解TC自由基捕获实验和(b)光催化产氢自由基捕获实验

Figure 8 (a) Photocatalytic degradation of TC and (b) photocatalytic H₂ evolution by ZCM₄ST₁₅ in the presence of various scavengers

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