Unveiling the origin of high-efficiency charge transport effect of C3N5/C3N4 homojunction for activating peroxymonosulfate to degrade atrazine under visible light

被引：65

作者：

Deng, Yaocheng ^{[1
]}

Li, Ling ^{[1
]}

Zeng, Hao ^{[1
]}

Tang, Rongdi ^{[1
]}

Zhou, Zhanpeng ^{[1
]}

Sun, Yuchen ^{[1
]}

Feng, Chengyang ^{[2
]}

Gong, Daoxin ^{[1
]}

Wang, Jiajia ^{[3
]}

Huang, Ying ^{[1
]}

机构：

[1] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China

[2] King Abdullah Univ Sci & Technol, KAUST Catalysis Ctr, Phys Sci & Engn Div, Thuwal 239556900, Saudi Arabia

[3] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 457卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Carbon nitride homojunction; Peroxymonosulfate activation; DFT calculation; Atrazine; Photocatalysis; GRAPHITIC CARBON NITRIDE; PHOTOCATALYTIC ACTIVITY; COMPOSITES; OXIDE; NANOSHEETS; OXIDATION; HYDROXYL;

D O I：

10.1016/j.cej.2022.141261

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Photocatalytic activation of PMS is a potential advanced oxidation process in refractory wastewater purification. Herein, a C3N5/C3N4 homojunction (AT-CN) catalyst as an efficient photocatalyst for PMS activation is reported, which owns interlaced band structure, high-efficiency charge transfer, and PMS activation capability. This homojunction structure is demonstrated to be highly efficient in charge transfer and separation. As experimental result, the reaction rate constants of atrazine in AT-CN/PMS/Vis system increased to 2.9-fold and 7.4-fold, compared with C3N4/PMS/Vis and C3N5/PMS/Vis system. The photocatalytic activation of PMS for atrazine removal efficiency reached 97 % within 60 min (under pH = 3). The band structure, the charge density dif-ference, the PMS adsorption behavior of AT-CN, and the activation pathways of PMS have been studied through the DFT calculation. According to experimental and DFT simulation, the AT-CN homojunction not only suppress the charge recombination via built-in electric field, but also exhibited a better PMS activation capability. In brief, this study through the combination of experiment and simulation is providing more inspiration for designing appropriate nonmetal homojunction in the photo-activated PMS process.

引用

页数：14

共 62 条

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