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-C_(3)N_(4)(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。
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-C_(3)N_(4)(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.
作者
祁君
李嘉乐
胡珊
于小凤
廖薇星
黄世文
徐秀泉
QI Jun;LI Jiale;HU Shan;YU Xiaofeng;LIAO Weixing;HUANG Shiwen;XU Xiuquan(School of Pharmacy,Jiangsu University,Zhenjiang 212013,China;School of Environment and Safety Engineering,Jiangsu University,Zhenjiang 212013,China;School of Traditional Chinese Medicine,Bozhou University,Bozhou 236800,China)
出处
《人工晶体学报》
CAS
北大核心
2024年第6期1034-1041,共8页
Journal of Synthetic Crystals
基金
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)。
