锌盐种类对纳米ZnO-玉米秸穰复合滤柱抗菌性能的影响  

Effects of Zinc Salts on Antibacterial Properties of Nano ZnO-Corn Stalk Core Composite Filter

作　　者：李孟 高欣[1] 唐晓宁[1] 张恒[1] 段会超 陈毅龙 Li Meng;Gao Xin;Tang Xiaoning;Zhang Heng;Duan Huichao;Chen Yilong(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500

出　　处：《稀有金属材料与工程》2021年第11期4037-4044,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51963012);国家级大学生创新创业训练计划(202010674039);昆明理工大学学生课外学术科技创新基金(2020BA157)。

摘　　要：玉米秸穰(CSC)是一种低成本、可持续的生物质资源,由于天然的多孔结构,可用作过滤材料。利用简易的化学沉淀法在秸穰上负载ZnO纳米粒子(ZnO NPs),用于水体的净化杀菌。不同锌源对ZnO NPs的生长形态和化学特性有显著影响,从而产生多种抗菌活性。以乙酸锌为锌源制备的复合滤柱显示出较优异的抗菌效果,在过滤5 min后对大肠杆菌和金黄色葡萄球菌的抗菌率分别达到了94.5%和90.5%。分析其抗菌机理推测为CSC的分级多孔结构对细菌有一定的截留作用,继而使细菌与纳米粒子发生物理摩擦以及与活性氧(ROS)和水合锌离子产生化学反应,使其细胞膜受损、细胞内成分渗漏最终导致细菌死亡。Corn stalk core(CSC)is low-cost and sustainable biomaterials,which can be used as a filtration material due to its nat urally porous structure.A simple method of chemical precipitation was applied to load ZnO nanoparticles(ZnO NPs)into the core,wh ich was used for water purification and sterilization.The different zinc sources ha ve an obvious effect on morphology and chemical characteristics of ZnO immobilized in CSC,leading to a variety of antibacterial activities.The composite biofilter prepared from zinc acetate show s the excellent antibacterial effect,and the antibacterial rates of escherichia coli and staphylococcus aureus reach 94.5%and 90.5%,respectively,after filtration for 5 min.The antibacterial mechanism of the hybrid column might be ascribed to the interception of bacteria by hierarchical porous structure of CSC,resulting in an increase of the physical friction with nanoparticles and chemical reactions with reactive oxygen species(ROS)and hydrated zinc ions.Consequently,the cell membranes of bacteria are damaged and the components in cells are leaked,finally leading to the death of bacteria.

关 键 词：玉米桔穰 ZNO纳米粒子 水体杀菌 抗菌机理 

分 类 号：TB39[一般工业技术—材料科学与工程]