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Effects of surfactants on the combined toxicity of TiO_2 nanoparticles and cadmium to Escherichia coli

查看全文 作　　者：Mei [1]Li;Jianchuan [1]Pei;Xiaomeng [1]Tang;Xiaoli [1]Guo 高影响力作者 机构地区：[1]School of Environmental and Resource Sciences, Zhejiang A & F University高影响力机构 出　　处：《Journal of Environmental Sciences》索引2018年第30卷第12期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(No.21607132);the Natural Science Foundation of Zhejiang Province(No.LQ14B070007) 摘　　要：The combined ecological toxicity of TiO_2 nanoparticles(nano-TiO_2) and heavy metals has been paid more attention. As the common pollutants in water environment, surfactants could affect the properties of nanoparticles and heavy metals, and thus further influence the combined toxicity of nano-TiO_2 and heavy metals. In this study, the effects of sodium dodecyl benzene sulfonate(SDBS) and Tween 80 on the single and combined toxicities of Cd^(2+) and nano-TiO_2 to Escherichia coli(E. coli) were examined, and the underlying influence mechanism was further discussed. The results showed both SDBS and Tween 80 enhanced the toxicity of Cd^(2+) to E. coli in varying degrees. The reaction of SDBS and Cd^(2+) could increase the outer membrane permeability and the bioavailability of Cd, while Tween 80 itself could enhance the outer membrane permeability. The combined toxicity of nano-TiO_2 and Cd^(2+) to E. coli in absence of surfactant was antagonistic because of the adsorption of Cd^(2+) to nanoTiO_2 particles. However, in the presence of SDBS, both SDBS and nano-TiO_2 influenced the toxicity of Cd^(2+) , and also SDBS could adsorb to nano-TiO_2 by binding to Cd^(2+) . The combined toxicity was reduced at Cd^(2+) lower than 4 mg/L and enhanced at Cd^(2+) higher than 4 mg/L under multiple interactions. Tween 80 enhanced the combined toxicity of nano-TiO_2 and Cd^(2+) by increasing the outer membrane permeability. Our study firstly elucidated the effects of surfactants on the combined toxicity of nano-TiO_2 and Cd^(2+) to bacteria, and the underlying influencing mechanism was proposed. 关 键 词：NANO-TIO2 表面活化剂 联合毒性 TWEEN SDBS 重金属 膜渗透 污染物质
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