Broad-spectrum response NCQDs/Bi2O2CO3 heterojunction nanosheets for ciprofloxacin photodegradation: Unraveling the unique roles of NCQDs upon different light irradiation

被引:47
作者
Hu, Xin [1 ]
Zhao, Huiping [1 ]
Liang, Ying [2 ]
Chen, Fengxi [1 ]
Li, Jun [3 ]
Chen, Rong [1 ,3 ]
机构
[1] Wuhan Inst Technol, Sch Chem & Environm Engn, Hubei Key Lab Novel Reactor & Green Chem Technol, Wuhan 430205, Peoples R China
[2] Hubei Univ Arts & Sci, Sch Chem Engn, Xiangyang 441053, Peoples R China
[3] Zhengzhou Univ, Henan Inst Adv Technol, Zhengzhou 450002, Peoples R China
基金
中国国家自然科学基金;
关键词
Carbon quantum dots; Bi2O2CO3; Near infrared light; Electron transfer pathways; Ciprofloxacin; CARBON QUANTUM DOTS; ENHANCED PHOTOCATALYTIC ACTIVITY; OXYGEN VACANCY; ELECTRON MEDIATOR; FACILE SYNTHESIS; CHARGE-TRANSFER; DEGRADATION; PERFORMANCE; MECHANISM; BI2O2CO3;
D O I
10.1016/j.chemosphere.2020.128434
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
N-doped carbon quantum dots (NCQDs) decorated Bi2O2CO3 heterojunction nanosheets have been successfully constructed by a facile hydrothermal method. The obtained NCQDs/Bi2O2CO3 heterojunction exhibits a wide-spectrum absorption ability and remarkably enhanced photocatalytic activities for ciprofloxacin photodegradation from ultraviolet to near-infrared region. The critical roles of NCQDs and two different charge separation and transfer processes of NCQDs/Bi2O2CO3 heterojunction under different light irradiations have been elucidated. Upon UV light irradiation, NCQDs act as electron reservoirs and a Z-scheme charge transfer process between Bi2O2CO3 and NCQDs promotes electrons transfer and center dot O-2(-) reactive species generation. Under visible and NIR light irradiation, NCQDs act as photosensitizer (hole reservoirs) to harvest solar light and a type-II heterojunction leads to an efficient charge carrier separation and thus high catalytic ability. The mechanisms and pathways of ciprofloxacin degradation driven by different lights are discussed accordingly. This work provides a versatile pathway to well design an efficient wide-spectrum response photocatalyst. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:12
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