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Carbon quantum dots-decorated TiO2/g-C3N4 film electrode as a photoanode with improved photoelectrocatalytic performance for 1,4-dioxane degradation.
Chemosphere. 2020 Jul; 251:126381.C

Abstract

In this study, carbon quantum dots (CQDs) were used to decorate a TiO2/g-C3N4 (TCN) film electrode. The morphological, optical, and electrochemical properties of the TiO2/g-C3N4/CQDs nanorod arrays (TCNC NRAs) film were investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), and electrochemical impedance spectroscopy (EIS). The improved optical properties, photoelectrochemical properties and photoelectrocatalytic (PEC) performance of photoanode can be observed by doping CQDs onto the TCN NRAs film. Compared with TiO2 NRAs and TCN NRAs, the narrower band gap of 2.47 eV and longer lifetime of photoinduced electron-hole pairs were observed in the TCNC NRAs. Under visible light irradiation and a bias voltage of 1.2 V, the photocurrent density and 1,4-dioxane (1,4-D) removal rate of PEC process with TCNC NRAs electrode reached 0.16 mA/cm2 and 77.9%, respectively, which was 2.5 times and 1.5 times of that with TCN NRAs electrode. TCNC NRAs electrode could keep >75% of the 1,4-D removal rate during five cycles tests. High PEC performance with TCNC NRAs electrode could be attributed to the enhanced charge separation and the change of electron transfer mechanism from typical heterojunction to Z-scheme, which may increase the active species production and change the dominant reactive species from O2·- to ·OH. Our experimental results should be useful for studying the degradation of 1,4-D and developing efficient PEC materials.

Authors+Show Affiliations

Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China. Electronic address: zengcp@mail.sysu.edu.cn.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China. Electronic address: luyaobin@mail.sysu.edu.cn.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32443232

Citation

Su, Yuehan, et al. "Carbon Quantum Dots-decorated TiO2/g-C3N4 Film Electrode as a Photoanode With Improved Photoelectrocatalytic Performance for 1,4-dioxane Degradation." Chemosphere, vol. 251, 2020, p. 126381.
Su Y, Liu G, Zeng C, et al. Carbon quantum dots-decorated TiO2/g-C3N4 film electrode as a photoanode with improved photoelectrocatalytic performance for 1,4-dioxane degradation. Chemosphere. 2020;251:126381.
Su, Y., Liu, G., Zeng, C., Lu, Y., Luo, H., & Zhang, R. (2020). Carbon quantum dots-decorated TiO2/g-C3N4 film electrode as a photoanode with improved photoelectrocatalytic performance for 1,4-dioxane degradation. Chemosphere, 251, 126381. https://doi.org/10.1016/j.chemosphere.2020.126381
Su Y, et al. Carbon Quantum Dots-decorated TiO2/g-C3N4 Film Electrode as a Photoanode With Improved Photoelectrocatalytic Performance for 1,4-dioxane Degradation. Chemosphere. 2020;251:126381. PubMed PMID: 32443232.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Carbon quantum dots-decorated TiO2/g-C3N4 film electrode as a photoanode with improved photoelectrocatalytic performance for 1,4-dioxane degradation. AU - Su,Yuehan, AU - Liu,Guangli, AU - Zeng,Cuiping, AU - Lu,Yaobin, AU - Luo,Haiping, AU - Zhang,Renduo, Y1 - 2020/02/29/ PY - 2019/11/25/received PY - 2020/02/13/revised PY - 2020/02/28/accepted PY - 2020/5/24/entrez PY - 2020/5/24/pubmed PY - 2020/6/19/medline KW - 1,4-Dioxane KW - Carbon quantum dots KW - Graphite carbon nitride KW - Photoelectrocatalysis KW - TiO(2) nanorods SP - 126381 EP - 126381 JF - Chemosphere JO - Chemosphere VL - 251 N2 - In this study, carbon quantum dots (CQDs) were used to decorate a TiO2/g-C3N4 (TCN) film electrode. The morphological, optical, and electrochemical properties of the TiO2/g-C3N4/CQDs nanorod arrays (TCNC NRAs) film were investigated using transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), and electrochemical impedance spectroscopy (EIS). The improved optical properties, photoelectrochemical properties and photoelectrocatalytic (PEC) performance of photoanode can be observed by doping CQDs onto the TCN NRAs film. Compared with TiO2 NRAs and TCN NRAs, the narrower band gap of 2.47 eV and longer lifetime of photoinduced electron-hole pairs were observed in the TCNC NRAs. Under visible light irradiation and a bias voltage of 1.2 V, the photocurrent density and 1,4-dioxane (1,4-D) removal rate of PEC process with TCNC NRAs electrode reached 0.16 mA/cm2 and 77.9%, respectively, which was 2.5 times and 1.5 times of that with TCN NRAs electrode. TCNC NRAs electrode could keep >75% of the 1,4-D removal rate during five cycles tests. High PEC performance with TCNC NRAs electrode could be attributed to the enhanced charge separation and the change of electron transfer mechanism from typical heterojunction to Z-scheme, which may increase the active species production and change the dominant reactive species from O2·- to ·OH. Our experimental results should be useful for studying the degradation of 1,4-D and developing efficient PEC materials. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/32443232/Carbon_quantum_dots-decorated_TiO2/g-C3N4_film_electrode_as_a_photoanode_with_improved_photoelectrocatalytic_performance_for_1,4-dioxane_degradation L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(20)30574-9 DB - PRIME DP - Unbound Medicine ER -