纳米Ag修饰S掺杂g-C3N4的制备及其光催化抗菌性能

人工晶体学报 ›› 2024, Vol. 53 ›› Issue (6): 1034-1041.

纳米Ag修饰S掺杂g-C₃N₄的制备及其光催化抗菌性能

祁君¹, 李嘉乐², 胡珊², 于小凤¹, 廖薇星¹, 黄世文³, 徐秀泉³

1.江苏大学药学院,镇江 212013;
2.江苏大学环境与安全工程学院,镇江 212013;
3.亳州学院中药学院,亳州 236800

收稿日期:2024-01-30 出版日期:2024-06-15 发布日期:2024-06-20
通信作者: 于小凤,博士,副教授。E-mail:24500197@qq.com; 徐秀泉,博士,副教授。E-mail:xxq781026@ujs.edu.cn
作者简介:祁君(1990—),女,江苏省人,硕士研究生。E-mail:719100885@qq.com
基金资助:
安徽省高等学校科学研究重大项目(2023AH040316);安徽省大学生创新训练项目(S202312926075);江苏大学大学生创新训练项目(202310299499X)

Preparation of Nano Ag Decorated Sulfur Doped g-C₃N₄ and Its Photocatalytic Antibacterial Performance

QI Jun¹, LI Jiale², HU Shan², YU Xiaofeng¹, LIAO Weixing¹, HUANG Shiwen³, XU Xiuquan³

1. School of Pharmacy, Jiangsu University, Zhenjiang 212013, China;
2. School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China;
3. School of Traditional Chinese Medicine, Bozhou University, Bozhou 236800, China

Received:2024-01-30 Online:2024-06-15 Published:2024-06-20

摘要/Abstract

摘要： 光催化灭活是公认的控制病原微生物最具前景手段之一。本文以尿素和硫代巴比妥酸为起始原料,通过热聚合反应制备S掺杂g-C₃N₄(SCN),随后采用光还原法将Ag纳米粒负载于SCN表面获得新颖的可见光响应型Ag/SCN抗菌材料。对所制备纳米材料进行XRD、SEM、TEM、XPS及UV-Vis DRS表征,并深入探讨其在可见光下灭活大肠杆菌(E. coli)的性能和机制。结果表明,Ag纳米粒均匀且牢固地负载在SCN表面,纳米材料表现出显著增强的可见光响应能力。当负载量为6%时,Ag/SCN-6呈现出最佳的光催化灭菌活性,60 min内能够将6.2 lg CFU·mL^-1 的E. coli全部灭活。自由基捕获实验结果表明,超氧自由基(·O^-₂)是灭活过程中最主要活性物种,它协同光生空穴(h⁺)和羟基自由基(·OH)主导了光催化抗菌的进程。

关键词: g-C₃N₄, S掺杂, 纳米Ag 修饰, 光催化, 灭活, 机理

Abstract: Photocatalytic inactivation has been proved to be one of the most promising strategies for controlling pathogenic microorganisms. Herein, a novel Ag nanoparticles (NPs) decorated sulfur doped g-C₃N₄ (Ag/SCN) composite was successfully prepared by combining thermal polymerization and photoreduction methods using urea and thiobarbituric acid as precursors. The as-prepared samples were characterized by XRD, SEM, TEM, XPS and UV-Vis DRS, the inactivation properties and mechanism against E. coli were investigated in depth. The results indicate that Ag NPs are uniformly and tightly decorated on the surface of SCN and the Ag/SCN composites exhibite significantly enhanced visible light response. When the decorating amount of Ag is 6%, the Ag/SCN-6 achieves the optimal photocatalytic antibacterial activity, which could completely inactivate 6.2 lg CFU·mL^-1 of E. coli within 60 min of visible light irradiation. Moreover, active species trapping experiments reveal that the generated superoxide radicals (·O^-₂) following with holes (h⁺) and hydroxyl radical (·OH) dominate the photocatalytic antibacterial process.

Key words: g-C₃N₄, S doping, nano Ag decoration, photocatalytic, inactivation, mechanism

中图分类号:

祁君, 李嘉乐, 胡珊, 于小凤, 廖薇星, 黄世文, 徐秀泉. 纳米Ag修饰S掺杂g-C₃N₄的制备及其光催化抗菌性能[J]. 人工晶体学报, 2024, 53(6): 1034-1041.

QI Jun, LI Jiale, HU Shan, YU Xiaofeng, LIAO Weixing, HUANG Shiwen, XU Xiuquan. Preparation of Nano Ag Decorated Sulfur Doped g-C₃N₄ and Its Photocatalytic Antibacterial Performance[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(6): 1034-1041.

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纳米Ag修饰S掺杂g-C₃N₄的制备及其光催化抗菌性能

Preparation of Nano Ag Decorated Sulfur Doped g-C₃N₄ and Its Photocatalytic Antibacterial Performance

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