银原位改性HMS材料的结构及抗菌性能

Structure and antibacterial ability of in situ silver-modified hexagonal mesoporous silica

采用溶胶凝胶法,以银氨离子为银源,原位合成了含Ag六方介孔硅(Ag-HMS)无机抗菌材料,探讨了其抗菌性能,并利用XRD、FT-IR、TG-DTA、UV-Vis、ESEM、EDS及N2的吸附/脱附等方法对材料进行了表征。结果表明,材料保持了良好的介孔结构和热稳定性,具有良好的紫外线吸收性能,银物种以骨架态和非骨架态形式存在并且分散均匀;相对于HMS,Ag-HMS材料脱模时的热化学过程、孔体积、介孔有序度、比表面积及粒子形貌均发生了显著改变。在抑菌实验中,Ag-HMS对枯草杆菌(B.subtilis)、大肠杆菌(E.coil)、芽孢杆菌(G.bacillus)及金黄色葡萄球菌(S.aureus)均显示出良好的抗菌性能,其中对枯草杆菌和大肠杆菌尤为显著,当Ag-HMS用量为1.00mg·L-1,12h后即可将两者彻底杀灭。

Silver-modified hexagonal mesoporous silica （Ag-HMS） was in situ synthesized with the sol-gel method and by using [Ag （NH3）2]^＋ as the silver source. The structure and properties were characterized by XRD, FT-IR, TG-DTA, UV-Vis, ESEM, EDS and N2 adsorption/desorption, and the antibacterial ability was investigated. The results indicated that Ag-HMS had favorable mesoporous structure, thermal stability and absorption ability of ultraviolet radiation, the silver species were evenly distributed in the material and existed in the form of framework/non-framework. As compared with HMS, Ag-HMS changed significantly in terms of demoulding thermochemical process, pore volume, mesoporous degree of orderliness, specific surface area, and particle shape. The results of antibacterial experiments showed that Ag-HMS had strong inhibition on B. subtilis, E. coil, G. bacillus and S. aureus. Especially for B. subtilis and E. coil, at the dose of Ag-HMS up to 1.00 mg · L^-1 , these two bacteria were entirely killed after incubation for 12 h.