ZIF-8/TiO2复合介观晶体的制备及光催化活性

doi:10.15541/jim20240043

无机材料学报

ZIF-8/TiO₂复合介观晶体的制备及光催化活性

马彬彬¹, 钟婉菱², 韩涧¹, 陈椋煜¹, 孙婧婧¹, 雷彩霞^1,2

1.厦门理工学院材料科学与工程学院,福建省功能材料及应用重点实验室, 厦门 361024;
2.广西大学资源环境与材料学院, 南宁 530004

收稿日期:2024-01-22 修回日期:2024-03-13 出版日期:2024-03-30 网络出版日期:2024-03-30
作者简介:马彬彬（1997-)，男，硕士研究生.E-mail: 949843122@qq.com
基金资助:
福建省自然科学基金项目(2022J011265);厦门理工学院科学技术研究项目(303021002)

Preparation and Photocatalytic Activity of ZIF-8/TiO₂ Composite Mesocrystals

MA Binbin¹, ZHONG Wanling², HAN Jian¹, CHEN Liangyu¹, SUN Jingjing¹, LEI Caixia^1,2

1. School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China;
2. School of Resources, Environment, and Materials, Guangxi University, Nanning 530004, China

Received:2024-01-22 Revised:2024-03-13 Published:2024-03-30 Online:2024-03-30
About author:MA Binbin(1997-), male, Master candidate.E-mail: 949843122@qq.com
Supported by:
Natural Science Foundation ofFujian Porvince(2022J011265);Sci& Tech Research Foundation of Xiamen University of Technology (303021002)

摘要/Abstract

摘要： TiO₂的微观形貌、颗粒尺寸及比表面积是影响其光催化活性的重要因素,介观晶体是一类由无机纳米粒子沿着相同的结晶轴方向有序排列的超结构材料,在光催化领域中具有重要的研究价值。本工作以六氟钛酸铵和硼酸为钛源和氟离子捕获剂,以无水乙醇和去离子水的混合溶液为溶剂,采用简单绿色的方法制备了NH₄TiOF₃介观晶体前驱体,然后通过硼酸溶液酸洗,使NH₄TiOF₃介观晶体通过拓扑转变为TiO₂介观晶体。最后采用沸石咪唑骨架材料ZIF-8纳米粒子对TiO₂介观晶体进行修饰,制备了ZIF-8/TiO₂复合介观晶体材料,并研究了其光催化降解亚甲基蓝的活性。实验结果表明,ZIF-8纳米粒子能够均匀生长在TiO₂介观晶体表面,形成比较致密的包覆层。ZIF-8/TiO₂复合介观晶体光催化剂具有较低的比表面积和较窄的禁带宽度,其光生电子和空穴的分离效率也得到一定程度的提高。其中,样品M-TiZIF-2(加入4 mmol硝酸锌的复合介观晶体)展现出最高的光催化活性,其一级反应速率是介观晶体TiO₂的42倍,ZIF-8单元材料的16倍。总之,在ZIF-8纳米粒子和TiO₂介观晶体的协同作用下,ZIF-8/TiO₂复合介观晶体材料显示出更优异的光催化性能。

关键词: TiO₂介观晶体, ZIF-8纳米粒子, 光催化, 复合介观晶体

Abstract: The microstructure, particle size and specific surface area of TiO₂ are crucial factors influencing its photocatalytic activity. Mesocrystals represent a type of superstructural material formed by inorganic nanoparticles aligned along a common crystallographic axis, holding significant research potential in photocatalysis. This study employed ammonium hexafluorotitanate and boric acid as titanium precursors and fluorine ion scavengers, respectively, using a blend of anhydrous ethanol and deionized water as the reaction medium. NH₄TiOF₃ mesocrystals precursors were prepared by a facile green method. Subsequently, washing with boric acid solution enabled the transformation of NH₄TiOF₃ mesocrystals into TiO₂ mesocrysals through topotaxial conversion. Ultimately, the TiO₂ mesocrystals were functionalized with ZIF-8 nanoparticles, and the photocatalytic degradation activity of the resulting ZIF-8/TiO₂ composite mesocrystals was studied. Experimental finding showed that ZIF-8 nanoparticles can uniformly nucleate on the surface of TiO₂ mesocrystals, resulting in a relatively dense coating layer. The ZIF-8/TiO₂ composite photocatalyst exhibits a reduced specific surface area and a narrower band gap, and the separation efficiency of photogenerated electrons and holes is also improved to a certain extent. Notably, the sample M-TiZIF-2(with addition of 4 mmol Zn(NO₃)₂) demonstrated superior photocatalytic activity, achieving a first-order reaction rate 42-fold that of TiO₂mesocrystals and 16-fold that of pristine ZIF-8 nanoparticles. In conclusion, the synergistic effect of ZIF-8 nanoparticles and TiO₂ mesocrystals significantly augments the photocatalytic performance of the ZIF-8/TiO₂ composite mesocrystal materials.

Key words: TiO₂ mesocrystals, ZIF-8 nanoparticles, photocatalysis, composite mesocrystals

中图分类号:

TB332

马彬彬, 钟婉菱, 韩涧, 陈椋煜, 孙婧婧, 雷彩霞. ZIF-8/TiO₂复合介观晶体的制备及光催化活性[J]. 无机材料学报, DOI: 10.15541/jim20240043.

MA Binbin, ZHONG Wanling, HAN Jian, CHEN Liangyu, SUN Jingjing, LEI Caixia. Preparation and Photocatalytic Activity of ZIF-8/TiO₂ Composite Mesocrystals[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20240043.

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ZIF-8/TiO₂复合介观晶体的制备及光催化活性

Preparation and Photocatalytic Activity of ZIF-8/TiO₂ Composite Mesocrystals

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