Ag/Ag_(3)PO_(4)/CNTs复合材料的光催化杀菌性能及机理  

Photocatalytic sterilization performance and mechanism of Ag/Ag_(3)PO_(4)/CNTs composites

作　　者：尹艳菲 霍敬豪 李海帅 史慧贤[1] YIN Yanfei;HUO Jinghao;LI Haishuai;SHI Huixian(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024

出　　处：《功能材料》2024年第10期10121-10126,共6页Journal of Functional Materials

基　　金：山西医科大学分子影像精准诊疗省部共建协同创新中心开放基金(2020-ZD01、2023-ZD01)。

摘　　要：工农业污水排放是引起水污染的重要因素之一,污水中的致病性微生物对生态环境和人类健康有极大危害。因此,研究新型复合光催化材料实现清除水中病原微生物具有重要意义。采用沉积-原位还原联合的方法制备了具有优异光催化性能的Ag/Ag_(3)PO_(4)/CNTs复合材料,采用多种表征手段对复合材料的形貌特征、晶体结构、元素组成以及光电性能等进行详细分析表征。通过平板涂布法评估了Ag/Ag_(3)PO_(4)/CNTs复合材料在可见光下的杀菌性能。Ag/Ag_(3)PO_(4)/CNTs复合材料在可见光照射下,20 min内可将10^(7)cfu/mL的大肠杆菌全部灭活,且对金黄色葡萄球菌(10^(7)cfu/mL)灭活率达到92.0%。SEM结果显示,经Ag/Ag_(3)PO_(4)/CNTs-光照体系中处理的金黄色葡萄球菌表面出现明显塌陷皱缩。对细胞内的遗传物质(DNA)含量进行了分析,结果表明,经过Ag/Ag_(3)PO_(4)/CNTs和光照处理后的金黄色葡萄球菌内的DNA含量显著降低,说明Ag/Ag_(3)PO_(4)/CNTs在光照下产生的活性氧可有效破坏细菌DNA。Ag/Ag_(3)PO_(4)/CNTs复合材料的构建为可见光下有效清除病原微生物提供了新思路。Industrial and agricultural sewage discharge is one of the important factors causing water pollution,and the pathogenic microorganisms in sewage are extremely harmful to the ecological environment and human health.Therefore,it is significant to study novel comprehensive photocatalytic materials to achieve the removal of pathogenic microorganisms in water.In this paper,Ag/Ag_(3)PO_(4)/CNTs composites with brilliant photocatalytic performance were prepared by a combination of deposition-in-situ reduction process,and the composites were analyzed and characterized in detail using a variety of characterization tools,such as morphological features,crystal structure,elemental composition,and photoelectric properties.The bactericidal efficiency of Ag/Ag 3PO 4/CNTs composites in visible light was evaluated by plate spreading method.The Ag/Ag 3PO 4/CNTs composites were able to deactivate all 10^(7)cfu/mL of E.coli and 92%of S.aureus(10^(7)cfu/mL)in 20 min under visible light irradiation.SEM results indicated that the surface of S.aureus treated with Ag/Ag_(3)PO_(4)/CNTs and Light appeared to be obviously collapsed and wrinkled.The content of genetic material(DNA)in the cells was analyzed,and the results showed that the DNA content in S.aureus treated with Ag/Ag_(3)PO_(4)/CNTs and Light was significantly reduced,suggesting that the reactive oxygen species(ROS)produced by Ag/Ag_(3)PO_(4)/CNTs under light can effectively damage bacterial DNA.The construction of Ag/Ag_(3)PO_(4)/CNTs composites provides a new idea for effective removal of pathogenic microorganisms under visible light.

关 键 词：磷酸银 碳纳米管 表面等离子效应 可见光催化 抗菌 

分 类 号：TB34[一般工业技术—材料科学与工程]