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Physical Properties of Fe3+/TiO2 Nanoparticles and Photocatalytic Disinfection of Foodborne Microorganisms

文献类型： 外文期刊

作者： Long, Men 1 ; Zhan, Ge 2 ; Sun, Meng-Yun 2 ; Zhuang, Hong 3 ; Wang, Ran 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Jiangsu Key Lab Food Qual & Safety, State Key Lab Cultivat Base MOST,Minist Agr,Inst, Key Lab Control Technol & Stand Agroprod Safety &, Nanjing 210014, Jiangsu, Peoples R China

2.CHUZHOU Univ, Coll Biol & Food Engn, Chuzhou 239000, Peoples R China

3.USDA ARS, Qual & Safety Assessment Res Unit, Athens, GA 30605 USA

关键词： Fe3+; Foodborne pathogen; Nanocomposite; Photocatalytic activity; TiO2

期刊名称：CURRENT TOPICS IN NUTRACEUTICAL RESEARCH （ 影响因子：0.416； 五年影响因子：0.536 ）

ISSN： 1540-7535

年卷期： 2019 年 17 卷 3 期

页码：

收录情况： SCI

摘要： In this article, we studied the preparation of Fe3+/TiO2 nanoparticles and the photocatalytic disinfection effects of two typical foodborne microorganisms, a gram-negative bacterium (Salmonella typhimurium) and a gram-positive bacterium (Listeria monocytogenes), in meat products. The physical properties of Fe3+/TiO2 nanoparticles embedded with various levels of Fe3+ (0%-10%) and synthesized through an impregnation process were investigated using X-ray diffraction, transmission electron microscopy, and UV-vis spectrophotometer, and their photocatalytic activities were evaluated by measuring the degradation of methylene blue dye and the disinfection of foodborne pathogens S. typhimurium and L. monocytogenes under visible light and UV light. Fe3+ ions were found to be scattered across TiO2 surfaces or across TiO2 crystal lattices as microcrystals. However, the capacity for TiO2 nanoparticles to absorb visible light was significantly enhanced after they were embedded with. Fe3+/TiO2 nanoparticles with molar ratios (R) of Fe3+ to TiO2 of 0.001:1, 0.005:1, and 0.01:1 exhibited higher levels of methylene blue dye photocatalytic degradation and higher levels of foodborne pathogen photocatalytic disinfection than the TiO2 control. However, nanoparticles containing > 1% Fe3+ exhibited lower levels of photocatalytic activity than the TiO2 control. Salmonella typhimurium was more resistant to the nano-Fe3+/TiO2 treatment than L. monocytogenes under visible and UV light conditions. These experiments demonstrate that embedding Fe3+ in TiO2 nanoparticles does not remarkably influence the TiO2 nanoparticle size or structure. Embedding appropriate levels of Fe3+ content (0.1%-1%) can enhance the photocatalytic activity of TiO2 nanoparticles.

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