ZIF-8修饰同质异相结TiO2的光催化固氮性能研究

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摘要:

光照条件下合成了微量ZIF-8定向修饰同质异相结TiO2的ZIF-8/TiO2复合材料以提高TiO2的光催化固氮能力.利用X射线衍射(XRD)、场发射电子扫描显微镜(FESEM)、X射线光电子能谱(XPS)、UV-Vis漫反射谱、电化学阻抗谱等对合成材料的结构组成、形貌及光电性能等进行表征.结果表明,适量的ZIF-8修饰除了能显著增加TiO2复合材料的比表面积和改善孔径分布范围之外,还能增强对可见光的吸收能力以及光生电荷的分离能力.光催化测试结果表明,ZIF-8/TiO2-3复合材料的平均固氮速率达到了742μmol·L-1·g-1·h-1,约为同质异相结TiO2的3.78倍,ZIF-8的3.71倍.经5次光催化循环后其光催化性能几乎没有衰减,表现出较好的光催化固氮活性和高的稳定性.为光催化固氮材料的设计提供了参考.

In order to improve the photocatalytic nitrogen fixation performances of TiO2polymorphs,ZIF-8/TiO2,composed by TiO2with the trace of ZIF-8 directional modification,were synthesized under light irradiation conditions.The X-ray diffraction(XRD),field emission electron scanning microscopy(FESEM),X-ray photoelectron spectroscopy(XPS),UV-Vis diffuse reflection spectroscopy and electrochemical impedance spectroscopy were used to characterize the structure,morphology and photoelectric properties of the as-prepared materials.The results reveal that the appropriate amount of ZIF-8 modification can not only increase significantly the specific surface area and improve the pore size distribution of TiO2composites,but also enhance the visible light absorption capacity and separation capacity of photogeneration charge.The results of the photocatalytic nitrogen fixation performance demonstrate that the average rate of nitrogen fixation is 742μmol·L-1·g-1·h-1on ZIF-8/TiO2-3 composite,which is about 3.78 and 3.71 times that of homojunction TiO2and ZIF-8,respectively.After 5 cycles,the photocatalytic performances of ZIF-8/TiO2-3 composite have almost no decay,presenting the good photocatalytic nitrogen fixation activity and high stability.This work provides a reference for the design of photocatalytic nitrogen fixation materials.

作者:

梁慧君李德生张燚豪赵晓华韦小龙周慧然王晓兵

Liang Huijun;Li Desheng;Zhang Yihao;Zhao Xiaohua;Wei Xiaolong;Zhou Huiran;Wang Xiaobing(School of Chemistry and Materials Engineering,Xinxiang University,Xinxiang 453003,China;School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China)

机构地区:

新乡学院化学与材料工程学院

引用本文:

《betway官方app 学报(自然科学版)》 CAS 2024年第1期116-123,I0011,共9页

Journal of Henan Normal University(Natural Science Edition)

基金:

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河南省高等学校重点科研项目(21A150027,23A530004) 国家自然科学基金(22202062) 河南省自然科学基金(222300420511)。

关键词:

同质异相结TiO2 ZIF-8/TiO2复合材料光催化固氮

homojunction TiO2 ZIF-8/TiO2composites photocatalysis nitrogen fixation

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