标题: Persulfate promoted visible photocatalytic elimination of bisphenol A by g-C3N4-CeO2 S-scheme heterojunction: The dominant role of photo-induced holes

作者: Xu, Y (Xu, Yin); Tang, X (Tang, Xin); Xiao, Y (Xiao, Yan); Tang, HL (Tang, Huiling); Lin, H (Lin, Heng); Lv, YJ (Lv, Yujuan); Zhang, H (Zhang, Hui)

来源出版物: CHEMOSPHERE 卷: 331 文献号: 138765 DOI: 10.1016/j.chemosphere.2023.138765 提前访问日期: MAY 2023 出版年: AUG 2023

摘要: In the last few years, coupling heterogeneous photocatalysis with persulfate (PDS) activation process is an efficient approach to generate abundant reactive oxidative species towards organic contaminant removal in water, however, the key role of PDS in photocatalytic process remains ambiguous. Herein, a novel g-C3N4-CeO2 (CN-CeO2) step-scheme (S-scheme) composite was constructed to photo-degrade bisphenol A (BPA) with the presence of PDS under visible irradiation. At 2.0 mM PDS, 0.7 g/L CN-CeO2 and natural pH 6.2, 94.2% of BPA could be eliminated in 60 min under visible light (Vis) illumination. Aside from the previous view of free radical generation, it tends to assume that most of PDS molecules acted as electron sacrificial agents for capturing photoinduced e(-) to form sulfate ions, greatly improving the charge carrier separation and thus enhancing the oxidation capacity of nonradical hole (h(+)) for the removal of BPA. Good correlations are further found between the rate constant and descriptor variables (i.e., Hammett constant sigma(-)/sigma(+) and half-wave potential E1/2), exhibiting selective oxidation for organic pollutants in the Vis/CN-CeO2/PDS system. The study brings more insights into mechanistic understanding of persulfate-enhanced photocatalytic process for addressing water decontamination.

作者关键词: Photocatalysis; Persulfate; Visible light; S-scheme heterojunction; Photogenerated holes; Mechanism

地址: [Xu, Yin; Tang, Xin; Xiao, Yan; Tang, Huiling; Lin, Heng; Zhang, Hui] Wuhan Univ, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

[Xu, Yin] Hubei Univ, Fac Resources & Environm Sci, Hubei Key Lab Reg Dev & Environm Response, Wuhan 430062, Peoples R China.

[Lv, Yujuan] Shangdong Elect Power Engn Consulting Inst Corp LT, Jinan 250013, Peoples R China.

通讯作者地址: Zhang, H (通讯作者)，Wuhan Univ, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

电子邮件地址: eeng@whu.edu.cn

影响因子：8.88