Citation: Li Yongjie, Xiang Wei, Zhou Tao, Huang Mingjie, Wang Chen, Wu Xiaohui, Mao Juan, Wang Penghua. Visible light induced efficient activation of persulfate by a carbon quantum dots (CQDs) modified γ-Fe₂O₃ catalyst[J]. Chinese Chemical Letters, ;2020, 31(10): 2757-2761. doi: 10.1016/j.cclet.2020.01.032 shu

Visible light induced efficient activation of persulfate by a carbon quantum dots (CQDs) modified γ-Fe₂O₃ catalyst

Li Yongjie ^a,b,1 ,
Xiang Wei ^a,b,1 ,
Zhou Tao ^a,*, ,
Huang Mingjie ^a,*, ,
Wang Chen ^a,b ,
Wu Xiaohui ^a,b ,
Mao Juan ^a,b ,
Wang Penghua ^c

a.
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
b.
Key Laboratory of Water and Wastewater Treatment(HUST), Ministry of Housing and Urban-Rural Development(MOHURD), Wuhan 430074, China
c.
Nanyang Environment & Water Research Institute(NEWRI), Nanyang Technological University, Singapore 637141, Singapore

zhoutao@hust.edu.cn

huangmingjie@hust.edu.cn

Received Date: 11 December 2019
Revised Date: 24 December 2019
Accepted Date: 15 January 2020
Available Online: 22 January 2020

Figures(4)

In this study, a carbon quantum dots modified maghemite catalyst (CQDs@γ-Fe₂O₃) has been synthesized by a one-step solvothermal method for efficient persulfate (PDS) activation under visible light irradiation. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV–vis diffuse reflectance spectroscopy (UV–vis DRS) characterization indicated that the formation of heterojunction structure between CQDs and γ-Fe₂O₃ effectively reduced the catalyst band gap (E_g), favoring the separation rate of electrons and holes, leading to remarkable efficient sulfamethoxazole (SMX) degradation as compared to the dark-CQDs@γ-Fe₂O₃/PDS and vis-γ-Fe₂O₃/PDS systems. The evolution of dissolved irons also demonstrated that CQDs could accelerate the in-situ reduction of surface-bounded Fe³⁺. Electron paramagnetic resonance (EPR) and radical scavenging experiments demonstrated that both ^·OH and SO₄^·- were generated in the reaction system, while ^·OH was relatively more dominant than SO₄^·- for SMX degradation. Finally, the reaction mechanism in the vis-CQDs@γ-Fe₂O₃/PDS system was proposed involving an effective and accelerated heterogeneous-homogeneous iron cycle. CQDs would enrich the photo-generated electrons from γ-Fe₂O₃, causing efficient interfacial generation of surface-bond Fe²⁺ and reduction of adsorbed Fe³⁺. This visible light induced iron cycle would eventually lead to effective activation of PDS as well as the efficient degradation of SMX.
- Carbon quantum dots,
- Iron cycle,
- Photocatalysis,
- Persulfate
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沈阳化工大学材料科学与工程学院沈阳 110142

Visible light induced efficient activation of persulfate by a carbon quantum dots (CQDs) modified γ-Fe2O3 catalyst

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通讯作者: 陈斌, bchen63@163.com

Visible light induced efficient activation of persulfate by a carbon quantum dots (CQDs) modified γ-Fe₂O₃ catalyst