N掺杂改性P_(25)抑菌材料的制备及其可见光催化抑菌活性的研究

Preparation of N doping P_(25) antibacterial material and its visible-light photocatalytic antibacterial activity

为提高纳米Ti O2(P25)对光照的吸收能力并增强其可见光催化抑菌活性,采用研磨-煅烧法将脲掺入Ti O2(P25)中对其进行改性,以可见光条件下N-P25改性抑菌材料对大肠杆菌抑菌效果为考察指标,对N-P25改性抑菌材料的制备条件进行优化。结果表明:脲掺杂量8.70 g/g P25,煅烧温度548℃,煅烧时间为1.9 h时,改性P25-N材料在可见光条件下对大肠杆菌的抑菌率为90%,较未改性的P25材料抑菌率(79%)提高了11%,有效地提高P25材料的抑菌率。研究结果为Ti O2光催化技术应用于制备抑菌性水果包装膜提供了参考。

In order to improve the light absorption capacity of nanometer Ti O2（ P25） and to enhance its visiblelight photocatalytic antibacterial activity,Nanometer Ti O2（ P25） was modified by urea incorporation with grinding-calcining method. The preparation conditions were optimized,which was measured by the photocatalytic antibacterial effect of Escherichia coli under visible-light. When thiourea doping amount was 8. 70 g / g P25,calcining temperature was548 ℃,and calcining time was 1. 9 h,the best visible-light photocatalytic antibacterial rate of modified N-P25reached90%,which was 11% higher than unmodified P25 and effectively improved the visible-light photocatalytic antibacterial rate of P25 material. The results provided a reference for the Ti O2 photocatalytic technology which applied to fruit antimicrobial packaging films.