Unravelling the role of reactive oxygen species in ultrathin Z-scheme heterojunction with surface zinc vacancies for photocatalytic H2O2 generation and CTC degradation

被引：70

作者：

Liu, Hui-Yun ^{[1
]}

Niu, Cheng-Gang ^{[1
]}

Huang, Da-Wei ^{[2
]}

Liang, Chao ^{[3
]}

Guo, Hai ^{[4
]}

Yang, Ya-Ya ^{[1
]}

Li, Lu ^{[1
]}

机构：

[1] Hunan Univ, Coll Environm Sci & Engn, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Peoples R China

[2] Minist Ecol & Environm PRC, South China Inst Environm Sci, Guangzhou 510655, Peoples R China

[3] Yantai Univ, Sch Environm & Mat Engn, Yantai 264005, Shandong, Peoples R China

[4] Hunan Univ Technol & Business, Sch Resources & Environm, Changsha 410205, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 465卷

基金：

中国国家自然科学基金;

关键词：

Built-in electronic field; Ultrathin; 2D; 2D contact; ROS; Zn vacancies; GRAPHITIC CARBON NITRIDE; CHARGE-TRANSFER; SYSTEM; NANOSHEETS;

D O I：

10.1016/j.cej.2023.143007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Photo-induced reactive oxygen species (ROS) produced by molecular oxygen activation and oxidization of H2O/ OH- during photocatalytic reaction are extremely important in environmental remediation. Herein, a dual pathway to improve ROS formation was designed through establishing ultrathin 2D/2D Z-scheme heterojunction and defect engineering in O-doped g-C3N4/ZnIn2S4-Zn (ZIS-Z/OCN) composite. The results of experiment and density functional theory (DFT) calculation indicate that the charge-carriers are spatially separated in composite driven by different work functions and ultrathin 2D/2D interface, boosting charge-transfer efficiency from 42.05 % (ZnIn2S4-Zn) to 59.93 % (40ZIS-Z/OCN). Benefiting by this fact, improving molecular oxygen activation capacity can induce more ROS generation. In consequence, 40ZIS-Z/OCN reveals optimal chlortetracycline hydrochloride (CTC) removal efficiency (88.43 %) and hydrogen peroxide (H2O2) yield (168.67 mu mol/L) under visible light irradiation. The results of control experiments show that H2O2 is generated via two-step electron reduction route and singlet oxygen (1O2) conversion. This study provides new views on the construction of costeffective and reusable photocatalysts for environmental remediation and energy conversion.

引用

页数：19

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