Enhanced Charge Separation of α-Bi2O3-BiOI Hollow Nanotube for Photodegradation Antibiotic Under Visible Light

doi:10.1007/s40242-020-0170-7

高等学校化学研究 ›› 2020, Vol. 36 ›› Issue (6): 1227-1233.doi: 10.1007/s40242-020-0170-7

Enhanced Charge Separation of α-Bi₂O₃-BiOI Hollow Nanotube for Photodegradation Antibiotic Under Visible Light

ZHANG Pengfei^1,2, LIU Huan^1,2, LIANG Haiou^1,2, BAI Jie^1,2, LI Chunping^1,2

1. Chemical Engineering College, Inner Mongolia University of Technology, Hohhot 010051, P. R. China;
2. Inner Mongolia Key Laboratory of Industrial Catalysis, Hohhot 010051, P. R. China

收稿日期:2020-06-04 修回日期:2020-07-14 出版日期:2020-12-01 发布日期:2020-12-03
通讯作者: LIU Huan, LI Chunping E-mail:huanliu@imut.edu.cn;cp_li@imut.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China(No.21766022).

Enhanced Charge Separation of α-Bi₂O₃-BiOI Hollow Nanotube for Photodegradation Antibiotic Under Visible Light

ZHANG Pengfei^1,2, LIU Huan^1,2, LIANG Haiou^1,2, BAI Jie^1,2, LI Chunping^1,2

1. Chemical Engineering College, Inner Mongolia University of Technology, Hohhot 010051, P. R. China;
2. Inner Mongolia Key Laboratory of Industrial Catalysis, Hohhot 010051, P. R. China

Received:2020-06-04 Revised:2020-07-14 Online:2020-12-01 Published:2020-12-03
Contact: LIU Huan, LI Chunping E-mail:huanliu@imut.edu.cn;cp_li@imut.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21766022).

摘要/Abstract

摘要： It is highly desirable to exploit semiconductor materials with high photocatalytic degradation activity, especially bismuth oxyhalide semiconductor photocatalysts with special layered structure and suitable bandgap width. The low utilization rate of visible light and high recombination rate of photogenerated electron-hole of BiOI photocatalyst severely restrict its development. Herein, a heterojunction photocatalyst of α-Bi₂O₃-BiOI hollow nanotube was prepared by electrospinning method, solvothermal method and ion-exchange method. The α-Bi₂O₃-BiOI(BB-4, the stirring time of Bi₂O₃ in KI solution was 4 h) exhibited the best photocatalytic performance towards degrading the tetracycline hydrochloride(TC) solution, which could remove 85% of TC(10 mg/L) in 2 h under visible light irradiation. The estimated k_TC of α-Bi₂O₃-BiOI(BB-4) was ca. 3.9 and 1.8 times as much as that of α-Bi₂O₃ and pure BiOI, respectively. It indicated that the formation of α-Bi₂O₃-BiOI heterojunction can significantly improve the separation efficiency of photogenerated electron-hole pairs, therefore the photocatalytic ability was enhanced. Furthermore, a corresponding photocatalytic mechanism was proposed that ^·O₂^- radical and holes are the main active components in the photodegradation through trapping experiment.

关键词: BiOI, Bi₂O₃, Heterojunction, Electrons-holes separation, Photodegradation

Abstract: It is highly desirable to exploit semiconductor materials with high photocatalytic degradation activity, especially bismuth oxyhalide semiconductor photocatalysts with special layered structure and suitable bandgap width. The low utilization rate of visible light and high recombination rate of photogenerated electron-hole of BiOI photocatalyst severely restrict its development. Herein, a heterojunction photocatalyst of α-Bi₂O₃-BiOI hollow nanotube was prepared by electrospinning method, solvothermal method and ion-exchange method. The α-Bi₂O₃-BiOI(BB-4, the stirring time of Bi₂O₃ in KI solution was 4 h) exhibited the best photocatalytic performance towards degrading the tetracycline hydrochloride(TC) solution, which could remove 85% of TC(10 mg/L) in 2 h under visible light irradiation. The estimated k_TC of α-Bi₂O₃-BiOI(BB-4) was ca. 3.9 and 1.8 times as much as that of α-Bi₂O₃ and pure BiOI, respectively. It indicated that the formation of α-Bi₂O₃-BiOI heterojunction can significantly improve the separation efficiency of photogenerated electron-hole pairs, therefore the photocatalytic ability was enhanced. Furthermore, a corresponding photocatalytic mechanism was proposed that ^·O₂^- radical and holes are the main active components in the photodegradation through trapping experiment.

Key words: BiOI, Bi₂O₃, Heterojunction, Electrons-holes separation, Photodegradation

ZHANG Pengfei, LIU Huan, LIANG Haiou, BAI Jie, LI Chunping. Enhanced Charge Separation of α-Bi₂O₃-BiOI Hollow Nanotube for Photodegradation Antibiotic Under Visible Light[J]. 高等学校化学研究, 2020, 36(6): 1227-1233.

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Enhanced Charge Separation of α-Bi₂O₃-BiOI Hollow Nanotube for Photodegradation Antibiotic Under Visible Light

Enhanced Charge Separation of α-Bi₂O₃-BiOI Hollow Nanotube for Photodegradation Antibiotic Under Visible Light

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