摘要
分别以乙二醇/去离子水为溶剂,通过溶剂热/水热法分别制备了具有不同主导晶面的BiOIO_(3)/{110}BiOCl和BiOIO_(3)/{001}BiOCl异质结。采用X射线衍射、扫描电子显微镜、能量色散谱和紫外可见漫反射光谱对制备的BiOIO_(3)/BiOCl光催化剂进行了表征。在可见光照射下,通过对罗丹明B和苯酚水溶液的光催化降解,考察了BiOIO_(3)/BiOCl异质结的光催化活性。结果显示25%BiOIO_(3)/{110}BiOCl异质结具有最高的光催化效率。BiOIO_(3)/{110}BiOCl较好的光催化性能是由于其在可见光区较强的光吸收,以及异质结结构和BiOCl所具有的(110)主导晶面有利于光生载流子的分离。超氧自由基(·O2-)和空穴(h^(+))是光催化过程中的主要活性物质。此外,根据实验结果探讨了光催化性能增强的机理。
The BiOIO_(3)/BiOCl heterojunctions with different dominated facet,BiOIO_(3)/{110}BiOCl and BiOIO_(3)/{001}BiOCl,were prepared through facile solvothermal/hydrothermal methods with ethylene glycol/deionized water as solvents.As-prepared BiOIO_(3)/BiOCl photocatalysts were characterized by X-ray diffraction,scanning electron microscope,energy-dispersive spectroscopy,and UV-Vis diffuse reflectance spectra.The photocatalytic activity of BiOIO_(3)/BiOCl heterojunctions was evaluated by photo-catalytically decomposing rhodamine B and phenol in an aqueous solution under visible light irradiation.The results showed that 25%BiOIO_(3)/{110}BiOCl heterojunctions exhibited the highest photocatalytic efficiency.The degradation of RhB over 25%BiOIO_(3)/{110}BiOCl was 98.7%after 15 min of light irradiation.And 100%phenol can be degraded after irradiation for 150 min.The better photocatalytic performance of BiOIO_(3)/{110}BiOCl may be attributed to the strong absorption of the visible light,the heterojunction structure,and the efficient separation of photo-generated carriers benefiting from the dominated(110)facet of BiOCl.The superoxide radicals(·O2-)and holes(h^(+))are the main active species in the photocatalytic process.Moreover,a reasonable mechanism for enhanced photocatalytic performance was also discussed based on the experimental results.
作者
黄宗益
郑遗凡
杨娥
宋旭春
HUANG Zong-Yi;ZHENG Yi-Fan;YANG E;SONG Xu-Chun(College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China;Research Center of Analysis and Measurement,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2023年第2期263-271,共9页
Chinese Journal of Inorganic Chemistry
基金
福建省自然科学基金(No.2019J01260)资助。
