硝酸氧铋基三相异质结制备及光降解性能  

Preparation and photodegradation performance of Bi_(5)O_(7)NO_(3)-based triphase heterojunction

作　　者：于涵 丁帮福 辛见弟 杨艳民[3] 郑树凯[1] YU Han;DING Bang-fu;XIN Jian-di;YANG Yan-min;ZHENG Shu-kai(College of Electron and Information Engineering,Key Laboratory of Brain-Like Neuromorphic Devices and Systems of Hebei Province,Hebei University,Baoding 071002,China;College of Engineering and Architecture,Hebei University,Baoding 071002,China;College of Physics Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学电子信息工程学院河北省类脑神经器件与系统重点实验室,河北保定071002 [2]河北大学建筑工程学院,河北保定071002 [3]河北大学物理科学与技术学院,河北保定071002

出　　处：《应用化工》2022年第6期1614-1618,共5页Applied Chemical Industry

基　　金：国家自然科学基金(11974097);河北大学高层次人才基金(521000981118)。

摘　　要：为了探究异质结对光催化活性作用,以五水硝酸铋为原料,水热法合成纯相硝酸氧铋、单斜α氧化铋和三相异质结样品。X射线衍射、拉曼光谱、高分辨透射电镜和X射线光电子能谱表征其晶体结构和相组成。结果表明,在250 W汞灯照射下,三相异质结和硝酸氧铋降解罗丹明B效率为98.1%和89.9%,高于α氧化铋25%和四方β氧化铋45%。这两个样品对甲基橙降解效率大于90%,高于α相77%和β相86%。通过带隙和莫特肖特基曲线分析,硝酸氧铋、α相和β相形成交错能带构型。光生电子依次从硝酸氧铋导带向α相和β相导带转移,加快电子空穴分离,因而增强光催化活性。扫描电镜和漫反射光谱分析得到形貌和双吸收对光催化活性起到进一步改进作用。因此采用原位生长法可获得高活性硝酸氧铋基光催化剂。To explore the effect of heterojunction on photocatalytic activity,pure Bi_(5)O_(7)NO_(3),α-Bi 2O 3,and triphase heterojunction were synthesized using hydrothermal method with Bi(NO_(3))_(3)·5H_(2)O as raw material.X-ray diffraction(XRD),Raman spectroscopy,high resolution transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS)were used to characterize the crystal structures and phase compositions.The result showed that after 90 min light irradiation of 250 W mercury lamps,the Rhodamine B degradation efficiency of heterojunction and Bi_(5)O_(7)NO_(3) are 98.1%and 89.9%.The values are far higher thanα-Bi_(2)O_(3) 25%andβ-Bi_(2)O_(3) 45%.The methyl orange degradation efficiency of these two samples are about 90%,faster than 77%ofα-Bi_(2)O_(3) and 86%ofβ-Bi_(2)O_(3).According to band gap and Mott-Schottky curve,Bi_(5)O_(7) NO_(3),α-andβ-Bi_(2)O_(3) form a staggered energy band configuration.Photogenerated electrons transfer from the conduction band of Bi_(5) O_(7) NO_(3) to theα-Bi_(2) O_(3) andβ-Bi_(2) O_(3) conduction bands in turn.The electron and hole is separated to improve the photocatalytic activity.Scanning electron microscopy(SEM)and diffuse reflectance spectroscopy show that the morphology and double absorption further enhance the photocatalytic activity.Therefore high activity Bi_(5)O_(7)NO_(3)-based photocatalyzer is in situ grown.

关 键 词：硝酸氧铋 三相异质结 双吸收 光降解 

分 类 号：TQ426.8[化学工程]