ZIF-8粒子已成功嵌入Bi2S3纳米棒表面,产生异质结构的Bi2S3@ ZIF-8光催化剂。
摘要:可见光驱动的有机转换以其低成本、相对安全、环境友好等优点受到人们的广泛关注。在本论文中,研究了一系列使用简单有效的自组装方法来制备Bi2S3 @ ZIF-8核壳异质结构。在可见光照射下使用罗丹明B(RhB)光催化降解来评价其光催化活性,结果表明,与原始的Bi2S3纳米棒相比,核壳Bi2S3 @ ZIF-8异质结构能够显着提高室温下的光催化效率。此外,Bi:Zn摩尔比为1:10的Bi2S3 @ ZIF-8复合材料在降解实验后表现出良好的结构稳定性,并且其光催化活性经过5次循环测试仍保持在95%左右。由于Bi2S3和ZIF-8的组合作用,改进的光催化性能可归因于更大的比表面积,更高的光吸收以及更高效的光生电子空穴对分离。此外,还研究了协同光催化机理。
关键词: 核壳异质结构;光催化活性;纳米棒;协同光催化机理
A visible-light driven Bi2S3@ZIF-8 core–shell heterostructure and synergistic photocatalysis mechanism
Abstract: Visible light-driven organic conversion has attracted widespread attention due to its low cost, relative safety, and environmental friendliness. In this paper, a series of simple and effective self-assembly processes were used to prepare Bi2S3 @ ZIF-8 core-shell heterostructures. The photocatalytic activity of RhB was evaluated by photocatalytic degradation under visible light irradiation. The results show that the core-shell Bi2S3 @ ZIF-8 heterostructure can significantly increase the room temperature temperature compared with the original Bi2S3 nanorods. Photocatalytic efficiency. In addition, the Bi2S3 @ ZIF-8 composite with a Bi:Zn molar ratio of 1:10 showed good structural stability after the degradation experiment, and its photocatalytic activity remained at about 95% after five cycles of testing. Due to the combined action of Bi2S3 and ZIF-8, the improved photocatalytic performance can be attributed to greater specific surface area, higher light absorption and more efficient photogenerated electron hole pair separation. In addition, a synergistic photocatalytic mechanism has also been studied.
KeyWords:Core-shell Heterostructures; Photocatalytic Activity; Nanorods; Synergistic Photocatalytic Mechanism
目 录
摘要 IV
Abstract IV
1 文献综述 1
1.1 引言 1
1.2 骨架类材料的发展 1
1.2.1 沸石分子筛 1
1.2.2 金属有机骨架材料 2
1.2.3 沸石眯唑骨架材料 3
1.3 半导体纳米材料 5
1.4 纳米硫化物 6
1.4.1 纳米硫化物半导体的研究现状 6
1.4.2 纳米硫化铋概述 7
1.4.3 纳米硫化铋的光谱匹配 8
1.5 Bi2S3@ZIF-8异质结构 8
1.6 本课题的研究意义 9
2 实验部分 10
2.1 实验原料及实验仪器设备 10
2.1.1 化学试剂及原料 10
2.1.2 仪器设备 10
2.2 实验过程 11
2.2.1 硫化铋纳米棒的合成(Bi2S3) 11
2.2.2 Bi2S3@ZIF-8核壳异质结构的合成 11
2.3 表征手段 12
2.3.1 X射线衍射技术(XRD) 12
2.3.2 傅里叶红外光谱仪(FT-IR) 12
2.3.3 扫描电镜(SEM) 12
2.3.4 X射线光电子能谱分析(XPS) 12
2.3.5 N2吸附-脱附曲线测试(BET) 13
2.3.6 紫外-可见漫反射光谱(UV-vis-DRS) 13
2.3.7 荧光光谱测试(PL) 13
2.4 光催化性能测试 13
3 结果与讨论 15
3.1 XRD分析 15
3.2 FT-IR分析 15
3.3 SEM分析 16
3.4 XPS分析 18
3.5 N2吸附-解吸附等温线分析 19
3.6 光催化活性分析 20
3.7 UV-VIS光谱分析 22
3.8 光催化机理 23
4 结论 25
致 谢 26
参考文献 27
1 文献综述
1.1 引言