摘要
Nano-MgO with various particle sizes, synthe- sized by different methods using Mg(NO3)2·6H2O, Na2CO3, Na2SO4, urea and ammonia solution as reactants, was used to carry out bactericidal experiments on Bacillus subtilis var. niger. The results were compared with the effect of TiO2, a common kind of photocatalytic material. The materials were characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), low temperature N2 adsorp- tion-desorption measurements and FT-IR, and the results showed that the bactericidal ability of MgO increases with decreasing particle size. Nano-MgO and an interior wall-paint containing the material have better bactericidal effects than nono-TiO2 in both presence and absence of light. The bactericidal mechanism is discussed. The surface of MgO can generate high concentrations of O?2 which is highly active and can react with the peptide linkages in the coating walls of the spores. The spores are destroyed by the resulting damage to their structure.
Abstract Nano-MgO with various particle sizes, synthesized by differentmethods using Mg(NO_3)_2 centre dot 6H_2O, Na_2CO_3, Na_2SO_4, urea and ammonia solution asreactants, was used to carry out bactericidal experiments on Bacillus subtilis var. niger. Theresults were compared with the effect of TiO_2, a common kind of photocatalytic material. Thematerials were characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), lowtemperature N_2 adsorp-tion-desorption measurements and FT-IR, and the results showed that thebactericidal ability of MgO increases with decreasing particle size. Nano-MgO and an interiorwall-paint containing the material have better bactericidal effects than nono-TiO_2 in both presenceand absence of light. The bactericidal mechanism is discussed. The surface of MgO can generate highconcentrations of O_2 which is highly active and can react with the peptide linkages in the coatingwalls of the spores. The spores are destroyed by the resulting damage to their structure.
基金
This work was supported by the National Natural Science Foundation of China(Grant No.90306012).
