Visible light photocatalytic degradation of tetracycline with porous Ag/graphite carbon nitride plasmonic composite: Degradation pathways and mechanism

被引:121
作者
Xu, Weicheng [1 ]
Lai, Shufeng [2 ]
Pillai, Suresh C. [3 ,4 ]
Chu, Wei [5 ]
Hu, Yun [6 ]
Jiang, Xueding [1 ]
Fu, Mingli [6 ]
Wu, Xiaolian [1 ]
Li, Fuhua [1 ]
Wang, Hailong [1 ,7 ]
机构
[1] Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Peoples R China
[2] Foshan Univ, Sch Transportat & Civil Engn, Foshan 528000, Peoples R China
[3] Inst Technol Sligo, Dept Environm Sci, Nanotechnol & Bioengn Res Grp, Sligo, Ireland
[4] Inst Technol Sligo, Ctr Precis Engn Mat & Mfg Res PEM, Sligo, Ireland
[5] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China
[6] South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Peoples R China
[7] Zhejiang A&F Univ, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Peoples R China
基金
中国国家自然科学基金;
关键词
G-C3N4; Antibiotic; Ag; Photocatalysis; Porous structure; Degradation pathway; Z-SCHEME PHOTOCATALYST; HETEROJUNCTION PHOTOCATALYSTS; G-C3N4; NANOSHEETS; FACILE SYNTHESIS; CHARGE-CARRIERS; PERFORMANCE; EFFICIENT; CONSTRUCTION; FABRICATION; PHOTODEGRADATION;
D O I
10.1016/j.jcis.2020.04.038
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ag/g-C3N4 plasmonic photocatalysts with porous structure (Ag/PCN) were successfully synthesized via a thermal exfoliation strategy and photo-reduction method. Owing to the combined merits of porous structure and surface plasmon resonance effect of silver nanoparticles, the Ag/PCN catalysts exhibited excellent photocatalytic performance for the degradation of antibiotic agents. With the optimal Ag loading, the Ag/PCN-2 catalyst exhibited the optimal catalytic activity for TC degradation under visible light, which shows about 11.8 times enhancement in the photocatalytic removal efficiency as compared to pure g-C3N4, respectively. This phenomenon can be attributed to the increased specific surface area, broadened visible light absorption and improved charge separation. The radical quenching results confirmed that h(+ ) and center dot O-2 radicals were the major active species during removal of TC. The degradation of TC is increased with the increment of Ag/PCN-2 catalysts, and the optimum catalyst was found to be 1.67 g/L. The hindering effect of selected of anions (Cl, CO3, H2PO4) was found to follow the order H2PO4 > CO3 > Cl. Ag/PCN-2 sample also possessed high stability after six cycles of reuses. Furthermore, the possible degradation pathways of TC and photocatalytic mechanism over Ag/PCN-2 were proposed in detail. (C) 2020 Elsevier Inc. All rights reserved.
引用
收藏
页码:110 / 121
页数:12
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