纳米碳管在胡敏酸中的分级悬浮

魏超贤; 张凰; 张迪; 杨晓磊

纳米碳管在胡敏酸中的分级悬浮

1.
昆明理工大学, 环境科学与工程学院, 云南昆明 650500;
2.
昆明理工大学, 云南省食品安全研究院, 云南昆明 650500

基金项目: 国家自然科学基金（41663014， 41303093）；云南省自然科学基金面上项目（2014FB121）；昆明理工大学人才启动经费（14118762）.

详细信息

作者简介:
魏超贤,硕士.E-mail:690647076@qq.com

通讯作者:
张迪,副教授,博士.E-mail:zhangdi2002113@sina.com

中图分类号: TQ127.1⁺1
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- 文章访问数: 469
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- 被引次数: 0
出版历程
- 收稿日期: 2017-01-20
- 录用日期: 2017-06-28
- 修回日期: 2017-04-02
- 刊出日期: 2017-06-28

Suspension of carbon nanotubes in natural humic acid water

1.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
2.
Yunnan Institute of Food Safety, Kunming University of Science & Technology, Kunming 650500, China

Funds: National Natural Science Foundation of China (41663014,41303093);Scientific Foundation of Yunnan Province (2014FB121);Scientific Foundation of Kunming University of Science and Technology (14118762).

摘要

摘要: 随着纳米碳管（CNTs）的广泛应用，其不可避免地进入环境中，天然有机质与CNTs的相互作用增大了CNTs的分散性，可能带来更大的环境风险。本研究系统考察了溶解胡敏酸（HA）对CNTs的悬浮效果，发现随着悬浮次数的增加，HA的累积吸附量不断增大，而CNTs的悬浮量先增加后减少，表明CNTs确实存在分级悬浮的现象。通过透射电子显微镜和热重分析对高悬浮量和低悬浮量的CNTs进行表征发现，高悬浮量的CNTs相比低悬浮量的CNTs短且碎，说明具有较多缺陷的CNTs可能是易悬浮的部分；尽管高悬浮量的CNTs对HA的累积吸附量较低，但其较早的出现了明显的失重平台，具有较差的热稳定性。两方面的证据可以证实CNTs自身性质的差异是其分级悬浮的控制性因素。
- 纳米碳管 /
- 分级悬浮 /
- 透射电镜 /
- 热重分析
Abstract: The widespread use of carbon nanotubes (CNTs) may cause them to be released into the environment.Their interaction with natural organic matter enhances their dispersion in water,leading to a severe environmental threat.In this study,the effect of dissolved humic acid (HA) on the dispersion of graphitized or hydroxylated CNTs in water was investigated by repeated dispersion of both CNTs in HA water with a concentration of 100 mg/L for 19 times.Results showed that the cumulative adsorption amounts of HA on the graphitized CNTs increased and leveled off,but those on the hydroxylated ones increased continually with the number of dispersions.The amounts of graphitized CNTs suspended in HA water were always lower than those of the hydroxylated ones,which reached a maximum after 4 of 5 dispersions.TEM images showed that hydroxylated CNTs were shorter than the graphitized ones and the suspended CNTs were shorter than the un-suspended ones for both types of CNTs,indicating that CNTs with more defects are easily suspended.
- Carbon nanotubes /
- Classified suspension /
- Transmission electron microscopy /
- Thermogravimetric analysis

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参考文献(21)

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