| 不同官能团多壁碳纳米管对镉的吸附及细菌毒性 |
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| 引用本文： | 李思艳,刘俊蕃,李梅.不同官能团多壁碳纳米管对镉的吸附及细菌毒性[J].浙江农林大学学报,2021,38(2):355-361. |
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| 作者姓名： | 李思艳 刘俊蕃 李梅 |
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| 作者单位： | 浙江农林大学 环境与资源学院， 浙江 杭州 311300 |
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| 基金项目： | 浙江农林大学大学生科研训练项目(KX20180093);国家自然科学基金资助项目(21607132,42076038)。 |
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| 摘 要： | 目的 探讨不同官能团多壁碳纳米管对镉离子(Cd2+)的吸附作用，揭示多壁碳纳米管影响镉细菌毒性的机制。 方法 通过批量吸附平衡实验研究不同官能团(羟基化、羧基化、氨基化、未经修饰)多壁碳纳米管(MWCNTs)对Cd2+的吸附性能，通过细菌毒性实验评估不同官能团多壁碳纳米管和Cd2+对大肠埃希菌Escherichia coli的毒性效应。 结果 4种多壁碳纳米管对Cd2+的吸附能力从大到小依次为羧基化多壁碳纳米管、羟基化多壁碳纳米管、多壁碳纳米管、氨基化多壁碳纳米管，吸附性能与碳纳米管含氧量相关。多壁碳纳米管- Cd2+复合物细菌毒性低于游离Cd2+，随纳米管质量浓度增加(0~200 mg·L?1)，羧基化多壁碳纳米管-Cd2+复合物作用下细菌存活率从67%提高到81%。 结论 不同官能团多壁碳纳米管对Cd2+的吸附量与碳纳米管含氧量呈正相关；多壁碳纳米管-Cd2+复合物细菌毒性低于游离Cd2+，认为多壁碳纳米管可降低游离Cd2+的细菌毒性。图4表2参26
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| 关 键 词： | 多壁碳纳米管 表面官能团 镉 吸附 大肠埃希菌 毒性效应 |
| 收稿时间： | 2020-04-28 |
Adsorption of cadmium on multi-walled carbon nanotubes with different functional groups and their bacterial toxicity |
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| LI Siyan,LIU Junfan,LI Mei.Adsorption of cadmium on multi-walled carbon nanotubes with different functional groups and their bacterial toxicity[J].Journal of Zhejiang A&F University,2021,38(2):355-361. |
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| Authors: | LI Siyan LIU Junfan LI Mei |
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| Affiliation: | College of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China |
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| Abstract: | Objective]This study attempted to explore the adsorption properties of multi-walled carbon nanotubes(MWCNTs)with different functional groups for cadmium,and to reveal the influence mechanism on the bacterial toxicity of cadmium.Method]The adsorption abilities of Cd2+on MWCNTs with different functional groups(hydroxylated,carboxylated,aminated and unmodified)were studied by batch adsorption equilibrium test.The effects of MWCNTs with different functional groups on the toxicity of Cd2+to Escherichia coli(E.coli)were evaluated by the bacterial toxicity test.Result]The order of Cd2+adsorption capacity on the four MWCNTs were carboxylated MWCNTs,hydroxylated MWCNTs,MWCNTs,finally aminated MWCNTs,which was related to the oxygen content.The combined bacterial toxicity of MWCNTs and Cd2+was lower than that of free Cd2+,and the bacterial survival rate increased from 67%to 81%with the increasing carboxylated MWCNTs concentration(0-200 mg·L-1).Conclusion]The adsorption of Cd2+by MWCNTs with different functional groups was positively correlated with their oxygen content.The combined bacterial toxicity of MWCNTs and Cd2+was lower than that of free Cd2+,and it was concluded that MWCNTs could reduce the bacterial toxicity of free Cd2+. |
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| Keywords: | multi-walled carbon nanotubes functional groups cadmium adsorption Escherichia coli toxicity |
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