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以Mg(NO3)2·6H2O, 无水Na2CO3, 无水Na2SO4, 尿素和氨水为原料, 采用不同方法制备了不同粒径的纳米 MgO. 用所合成的纳米 MgO 对 B. niger (枯草杆菌黑色变种芽孢)进行了杀菌实验并与常见的光催化杀菌材料 TiO2进行比较. 通过 XRD, TEM, BET 和 FT-IR 手段对样品进行测试和表征, 结果表明, MgO 的杀菌能力随粒径减小而增大. 与纳米 TiO2相比, 纳米 MgO 及以纳米 MgO 改性的内墙涂料,无论实验过程光照与否, 对 B. niger 均表现出更好的杀灭活性. 对 MgO 杀菌机理进行初步探讨, 表明MgO极易水合, 使粉体表面包覆一层OH?, 利于高浓度O2的存在, 而强氧化性的O2离子破坏了B. niger ? ?细胞壁的肽键, 从而起到杀菌作用.
Mg (NO 3) 2 · 6H 2 O, anhydrous Na 2 CO 3, anhydrous Na 2 SO 4, urea and ammonia were used as raw materials to prepare nano-MgO with different particle sizes by using different methods.The results showed that B. niger (B. subtilis var. Bacillus subtilis) was compared with that of common photocatalytic bactericidal material TiO2.The samples were tested and characterized by XRD, TEM, BET and FT-IR. The results showed that the bactericidal ability of MgO increased with the decrease of particle size Large.Compared with the nano-TiO2, nano-MgO and nano-MgO-modified interior paint, regardless of the experimental process of light or not, to B. niger showed better killing activity.Studying the bactericidal mechanism of MgO preliminary, It is indicated that MgO can be easily hydrated, so that the surface of the powder is covered with OH?, Which is favorable for the presence of high concentration of O2. The strongly oxidizing O2 ion destroys the peptide bond of the B. niger? Cell wall, thereby playing a bactericidal effect.