光催化
异质结
材料科学
化学工程
可见光谱
降级(电信)
盐酸四环素
光化学
催化作用
光电子学
化学
有机化学
四环素
电信
工程类
生物化学
抗生素
计算机科学
作者
You Wu,Xiaoming Li,Hui Zhao,Fubing Yao,Jian Cao,Zhuo Chen,Dongbo Wang,Qi Yang
标识
DOI:10.1016/j.cej.2021.131255
摘要
Constructing heterojunction has been widely applied in optimizing photocatalysts for organic pollutant removal. However, incompact contact interface and inappropriate band alignment in the heterointerface of two materials increase interfacial recombination, lowering the degradation efficiency. Herein, a facile strategy without any other surfactants or modification pretreatment was employed to encapsulate cubic Cu2O using metal-organic frameworks (MOFs) to construct heterojunction photocatalysts. The oriented growth of Cu-MOFs (HKUST-1) around cubic Cu2O (Cu2[email protected]) with desired feedstock ratio for enhanced photocatalytic degradation performance was achieved. Compared with the individual components, the optimized Cu2[email protected] heterostructures exhibited enhanced tetracycline hydrochloride (TC-HCl) removal rate of 93.40% within 60 min under visible light irradiation. Obviously, mechanism exploration revealed that the combined effect between the core-shell structure with compact interfacial contact and an ideal type-II band alignment in Cu2[email protected] increased the carrier density and accelerated interfacial charge separation and transfer. Meanwhile, HKUST-1 shell protected Cu2O core from the photocorrosion well, assuring the robust stability of photocatalyst during the photocatalytic process. After the fourth cycle, the photocatalytic TC-HCl degradation efficiency and total organic carbon (TOC) removal rate by Cu2[email protected] remained at 90.02% and 49.64%, respectively. The radical trapping results and electron spin resonance (ESR) identified the h+ and O2− were main active species in this photocatalytic degradation system. Besides, the TC-HCl degradation pathway was investigated by three-dimensional excitation-emission matrix fluorescence spectra and liquid chromatography-mass spectrometry technology. This work provides a facile method towards creating efficient and stable photocatalyst for organic pollutant removal.
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