运用模板法制备介孔二氧化硅(m-SiO2),借助溶胶-凝胶法制备介孔二氧化硅载TiO2(m-SiO2-TiO2)纳米复合材料。通过透射电镜(TEM)和X射线衍射(XRD)等手段对复合材料的形貌和组成进行表征。以亚甲基蓝(MB)和罗丹明B(RhB)的脱色降解实验来表征复合材料的光催化性能,通过CFU平板计数对其抗菌性能进行研究。结果表明:m-SiO2纳米颗粒具有有序的介孔结构,二氧化钛(TiO2)为锐钛矿相;在可见光照射下,RhB的光催化降解反应遵循一级反应动力学;复合材料的光催化降解活性由复合材料的吸附能力和TiO2的光催化活性共同决定;复合材料对铜绿假单胞菌(PA)有更强的抗菌效果。
Mesoporous silica(m-SiO2) was prepared by template method,and mesoporous silica-supported titania (m-SiO2-TiO2) nanocomposites were prepared by sol-gel method.The morphology and composition of the composites were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD).The photocatalytic properties of different TiO2 samples were characterized by decolorization degradation of methylene blue (MB) and rhodamine B (RhB).The antibacterial properties of the samples were characterized by CFU plate counting method.The results shown that m-SiO2 nanoparticles had an ordered mesoporous structure.TiO2 was supported on the surface of m-SiO2 with anatase crystal form.The photocatalytic activities of m-SiO2-TiO2 were evaluated by the photocatalytic degradation of Rhodamine B.The degradation of Rhodamine B followed first-order reaction kinetics.The photocatalytic activities of the composites depended on their adsorption abilities and the activity of titania loaded into the m-SiO2 molecular sieves.Nanocomposite material had stronger antibacterial effect on Pseudomonas aeruginosa.
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