摘要
将TiO_(2)加入NH_(2)-MIL-101(Fe)前驱体中,采用溶剂热法制备TiO_(2)/NH_(2)-MIL-101(Fe),进一步经高温热处理得到TiO_(2)/C、N掺杂Fe_(2)O_(3)复合材料(TiO_(2)/C、N-Fe_(2)O_(3))。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Fe_(2)O_(3)中,TiO_(2)复合C、N掺杂Fe_(2)O_(3)后禁带宽度减小,模拟太阳光照射2.5 h后,在0.1 g/L TiO_(2)/C、N-Fe_(2)O_(3)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TiO_(2)和C、N-Fe_(2)O_(3)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Fe_(2)O_(3)与TiO_(2)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。
TiO_(2)was added to NH_(2)-MIL-101(F_(e))precursor,and TiO_(2)/NH_(2)-MIL-101(F_(e))was prepared by solvothermal method.TiO_(2)/C、N-doped Fe_(2)O_(3)composites(TiO_(2)/C、N-Fe_(2)O_(3))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 TiO_(2)doped with C and N in Fe_(2)O_(3)decreases after TiO_(2)mixed with C and N doped with Fe_(2)O_(3).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/LTiO_(2)/C、N-Fe_(2)O_(3)composite.The rate is 0.0192 min^(-1),and the effect is significantly higher than that of TiO_(2)and C,N-Fe_(2)O_(3).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 Fe_(2)O_(3)and TiO_(2)derived from MOFs,and the separation of holes and electrons is strengthened,thus the visible light catalytic activity is improved.
作者
谢倩祎
程爱华
Xie Qianyi;Cheng Aihua(College of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2024年第1期47-55,共9页
Acta Energiae Solaris Sinica
基金
国家自然科学基金青年项目(51808442)。
