Assessing the effects of surface-bound humic acid on the phototoxicity of anatase and rutile TiO2 nanoparticles in vitro

被引:6
|
作者
Xiaojia He [1 ]
Sabrieon Sanders [2 ]
Winfred G.Aker [3 ]
Yunfeng Lin [4 ]
Jessica Douglas [5 ]
Huey-min Hwang [1 ]
机构
[1] Department of Biology,Jackson State University
[2] Department of Biological Sciences,Alcorn State University
[3] Environmental Science Ph.D.Program,Jackson State University
[4] Department of Chemistry and Biochemistry,Jackson State University
[5] School of Polymers and High Performance Materials,The University of Southern Mississippi
基金
美国国家科学基金会;
关键词
TiO2nanoparticles; Escherichia coli; Humic acid; Crystallinity; Surface coating;
D O I
暂无
中图分类号
X171.5 [污染生态学];
学科分类号
071012 ; 0713 ;
摘要
In this study,the cytotoxicity of two different crystal phases of TiO2nanoparticles,with surface modification by humic acid(HA),to Escherichia coli,was assessed.The physicochemical properties of TiO2nanoparticles were thoroughly characterized.Three different initial concentrations,namely 50,100,and 200 ppm,of HA were used for synthesis of HA coated TiO2nanoparticles(denoted as A/RHA50,A/RHA100,and A/RHA200,respectively).Results indicate that rutile(LC50(concentration that causes 50%mortality compared the control group)=6.5)was more toxic than anatase(LC50=278.8)under simulated sunlight(SSL)irradiation,possibly due to an extremely narrow band gap.It is noted that HA coating increased the toxicity of anatase,but decreased that of rutile.Additionally,AHA50 and RHA50had the biggest differences compared to uncoated anatase and rutile with LC50of 201.9 and21.6,respectively.We then investigated the formation of reactive oxygen species(ROS)by TiO2nanoparticles in terms of hydroxyl radicals(OH)and superoxide anions(O2-).Data suggested that O2-was the main ROS that accounted for the higher toxicity of rutile upon SSL irradiation.We also observed that HA coating decreased the generation of OH and O2-on rutile,but increased O2-formation on anatase.Results from TEM analysis also indicated that HA coated rutile tended to be attached to the surface of E.coli more than anatase.
引用
收藏
页码:50 / 60
页数:11
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