喷雾热解法制备非晶型TiO<sub>2</sub>@Ag/AgBr复合光催化剂的性能

伍锐; 鲍瑞; 刘鹏; 易健宏; 曲俊励

doi:10.19591/j.cnki.cn11-1974/tf.2021070010

喷雾热解法制备非晶型TiO₂@Ag/AgBr复合光催化剂的性能

doi: 10.19591/j.cnki.cn11-1974/tf.2021070010

昆明理工大学材料科学与工程学院, 昆明 650093

基金项目: 国家自然科学基金资助项目（52064032, 52174345）；云南省科技厅重大科技资助项目（202202AG050004）

详细信息

通讯作者:
E-mail: baorui@kmust.edu.cn (鲍瑞)

yijianhong@kmust.edu.cn (易健宏)

中图分类号: TB331; O643.36
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出版历程
- 收稿日期: 2021-09-06
- 刊出日期: 2023-06-28

Performance of amorphous TiO₂@Ag/AgBr composite photocatalyst prepared by spray pyrolysis

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

More Information

Corresponding author: E-mail: baorui@kmust.edu.cn (BAO R); yijianhong@kmust.edu.cn (YI J H)

摘要

摘要: 以TiCl₄为前体，通过喷雾热解法制备出非晶型TiO₂；以AgNO₃为银源，采用水包油自组装法合成TiO₂@Ag/AgBr复合光催化剂。利用X射线衍射仪和X射线光电子能谱仪分析了样品的微观结构和价态，采用扫描电镜和透射电镜观察了样品的表面形貌，使用紫外可见漫反射光谱仪、荧光光谱仪和电化学阻抗谱对样品的光吸收范围和电子复合行为进行表征。通过在自然光照条件下降解甲基橙的实验研究了复合材料的光催化性能，并探讨了不同Ag/AgBr负载量对光催化性能的影响。结果表明：制备的TiO₂为直径小于500 nm的非晶型纳米级球形颗粒，Ag/AgBr均匀的负载在其表面。制备的TiO₂@Ag/AgBr复合光催化剂均表现出良好的光催化活性，其中最佳负载量的TiO₂@Ag/AgBr复合光催化剂对甲基橙降解效率可达到91%。
- 喷雾热解 /
- 非晶二氧化钛 /
- 光催化 /
- 溴化银 /
- 复合材料
Abstract: Amorphous titanium dioxide was prepared by spray pyrolysis using TiCl₄ as the precursor, and the TiO₂@Ag/AgBr composite photocatalyst was synthesized by the oil-in-water self-assembly method with AgNO₃ as the silver source. The microstructure and valence state of the samples were analyzed by X-ray diffraction and X-ray photoelectron spectroscopy. The surface morphology of the samples was observed by scanning electron microscope and transmission electron microscope. The light absorption range and electronic recombination behavior of the samples were characterized by UV-Vis diffuse reflection spectrometer, fluorescence spectrophotometer, and electrochemical impedance spectroscopy. The photocatalytic performance was studied by degrading methyl orange under the natural light conditions, and the effect of Ag/AgBr loading capacity on the photocatalytic performance was discussed. The results show that, the prepared titanium dioxide is an amorphous nano-scale spherical particle with the diameter of less than 500 nm. Ag/AgBr is uniformly loaded on the TiO₂ surface. The prepared TiO₂@Ag/AgBr composite photocatalysts all show the good photocatalytic activity. The degradation efficiency of methyl orange by the TiO₂@Ag/AgBr composite photocatalyst with the best loading capacity can reach 91%.
- spray pyrolysis /
- amorphous titanium dioxide /
- photocatalysis /
- silver bromide /
- composites

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图 1 非晶型TiO₂和实验制备的复合光催化剂X射线衍射图谱

Figure 1. XRD patterns of ATD with the different AgNO₃ dosage

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图 2 ATD-40的X射线光电子能谱：（a）全谱；（b）Ag-3d

Figure 2. XPS spectra of ATD-40: (a) survey; (b) Ag-3d

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图 3 不同放大倍数下的非晶型TiO₂扫描电子显微形貌

Figure 3. SEM images of ATD at different magnification

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图 4 TiO₂@Ag/AgBr透射电镜显微形貌：（a）ATD-20；（b）ATD-40；（c）ATD-60；（d）ATD-40局部放大；（e）ATD-40局部放大

Figure 4. TEM images of TiO₂@Ag/AgBr: (a) ATD-20; (b) ATD-40; (c) ATD-60; (d) enlarged view of ATD-40; (e) enlarged view of ATD-40

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图 5 TiO₂@Ag/AgBr复合材料光学性能：（a）ATD和ATD-40紫外可见漫反射图谱；（b）ATD和ATD-40光致发光光谱；（c）ATD和ATD-40电化学阻抗谱；（d）不同样品在模拟太阳光照射下甲基橙光降解曲线；（e）不同样品甲基橙降解动力学曲线；（f）ATD-40重复降解甲基橙光催化实验

Figure 5. Optical properties of the TiO₂@Ag/AgBr composites: (a) UV-Vis DRS of ATD and ATD-40; (b) PL spectra of ATD and ATD-40; (c) EIS of ATD and ATD-40; (d) the photodegradation curves of MO in different samples under the simulated sunlight; (e) the kinetic curves of MO degradation in the different samples; (f) the photocatalytic tests of the repeated degradation of MO by ATD-40

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图 6 光催化反应机理示意图

Figure 6. Schematic diagram of the photocatalytic reaction mechanism

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