| 羧甲基纤维素钠对纳米Fe_3O_4在石英砂中迁移的影响 |
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| 引用本文： | 钟华,,崔朋,董浩然,张俊涛,张丽娜,田亚灵,曾光明. 羧甲基纤维素钠对纳米Fe_3O_4在石英砂中迁移的影响[J]. 湖南大学学报(自然科学版), 2017, 44(12): 121-126 |
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| 作者姓名： | 钟华 崔朋 董浩然 张俊涛 张丽娜 田亚灵 曾光明 |
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| 作者单位： | (1.湖南大学 环境科学与工程学院，湖南 长沙 410082;2.环境生物与控制教育部重点实验室(湖南大学)，湖南 长沙 410082) |
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| 摘 要： | 为提高纳米四氧化三铁(MNPs)在悬浊液中的稳定性,强化其在多孔介质中的迁移能力,实验选用羧甲基纤维素钠(CMC)修饰MNPs,通过zeta电位、颗粒粒径和沉降曲线的变化考察了修饰前后的MNPs在模拟地下水溶液中的稳定性,并通过一维柱实验考察了修饰前后的MNPs在石英砂介质中的迁移性能.结果表明:由于CMC对MNPs的修饰增大了MNPs表面的负电荷电量,有效抑制了MNPs的团聚,从而使得MNPs在CMC溶液中的稳定性远高于其在背景模拟地下水溶液的稳定性,相应作用也使得CMC修饰下的MNPs在石英砂介质中的迁移性能大大增强.
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| 关 键 词： | 纳米四氧化三铁 羧基纤维素钠 多孔介质 稳定性 迁移 |
Influence of Carboxymethyl Cellulose on Transport of Magnetite Nanoparticles in Quartz Sand |
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| Affiliation: | (1.College of Environmental Science and Engineering,Hunan University,Changsha 410082,China;2.Key Laboratory of Environmental Biology and Pollution Control (Hunan University),Ministry ofEducation,Changsha 410082,China) |
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| Abstract: | In order to increase the stability of magnetite nanoparticles (MNPs) in suspensions and enhance their transport in the porous media,carboxymethyl cellulose (CMC) was used to modify MNPs.Batch experiments were conducted to investigate the stability of bare MNPs and CMC-modified MNPs in the artificial groundwater (AGW).Influence of CMC on MNPs transport in the quartz sand was also studied by using 1-D column experiments.The increase of surface charge due to CMC modification inhibited agglomeration of MNPs,and thus increased the stability of MNPs in the CMC solution.Such effects also greatly promoted the transport of MNPs in the quartz sand. |
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