MOFs衍生多孔TiO2/C、N掺杂Fe2O3复合材料的制备及其光催化性能
PREPARATION AND PHOTOCATAILTIC PROPERTIES OF MOFS-DERIVED POROUS TiO2/C AND N-DOPED Fe2O3 COMPOSITES
谢倩祎 1程爱华1
作者信息
- 1. 西安科技大学地质与环境学院,西安 710054
- 折叠
摘要
将TiO2加入NH2-MIL-101(Fe)前驱体中,采用溶剂热法制备TiO2/NH2-MIL-101(Fe),进一步经高温热处理得到TiO2/C、N掺杂Fe2O3复合材料(TiO2/C、N-Fe2O3).采用X射线衍射(XRD)、扫描电子显微镜(SEM)、光电子能谱(XPS)、紫外-可见分光漫反射(UV-Vis DRS)和荧光光谱(PL)等方法对所得样品的晶体结构、形貌特征、组成及光谱特性进行表征.在模拟太阳光照射下对罗丹明B(RhB)溶液进行降解,评价其光催化活性.结果表明,C、N均匀掺杂在Fe2O3中,TiO2复合C、N掺杂Fe2O3后禁带宽度减小,模拟太阳光照射2.5 h后,在0.1 g/L TiO2/C、N-Fe2O3复合材料的光催化作用下,10 mg/L罗丹明B的去除率达到95%,速率常速为0.0192 min-1,效果较TiO2和C、N-Fe2O3有明显提高.所得复合材料稳定性好、可重复利用.MOFs衍生多孔C、N掺杂Fe2O3与TiO2的复合缩短了带隙,强化了空穴与电子的分离从而提高可见光催化活性.
Abstract
TiO2 was added to NH2-MIL-101(Fe)precursor,and TiO2/NH2-MIL-101(Fe)was prepared by solvothermal method.TiO2/C、N-doped Fe2O3 composites(TiO2/C、N-Fe2O3)were further obtained by high-temperature heat treatment.The crystal structure,morphology,composition and spectral characteristics of the obtained samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),photoelectron spectroscopy(XPS),UV-Vis diffuse reflection(UV-vis DRS)and fluorescence spectroscopy(PL).The photocatalytic activity of Rhodamine B(RhB)was evaluated by degradation of RhB solution under simulated sunlight irradiation.The results show that the band gap width of TiO2 doped with C and N in Fe2O3 decreases after TiO2 mixed with C and N doped with Fe2O3.After 2.5 h of simulated sunlight irradiation,the removal rate of 10 mg/L RhB reaches 95%under the photocatalytic action of 0.1 g/LTiO2/C、N-Fe2O3 composite.The rate is 0.0192 min-1,and the effect is significantly higher than that of TiO2 and C,N-Fe2O3.The composite material has good stability and can be used repeatedly.The band gap is shortened mainly through the composite of porous C and N-doped Fe2O3 and TiO2 derived from MOFs,and the separation of holes and electrons is strengthened,thus the visible light catalytic activity is improved.
关键词
Fe基-MOFs/光催化/TiO2/C、N掺杂Fe2O3/罗丹明BKey words
Fe-based-MOFs/photocatalysis/TiO2/C,N doped Fe2O3/RhB引用本文复制引用
基金项目
国家自然科学基金青年项目(51808442)
出版年
2024
NETL
NSTL
万方数据