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磁性氧化铁纳米颗粒在不同性质分散剂作用下的聚合状态

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徐其静, Ghosh Saikat, 王朋, 郭秉林, 郭倩月, 郭进. 磁性氧化铁纳米颗粒在不同性质分散剂作用下的聚合状态[J]. 环境化学, 2018, 37(2): 327-334. doi: 10.7524/j.issn.0254-6108.2017071202
引用本文: 徐其静, Ghosh Saikat, 王朋, 郭秉林, 郭倩月, 郭进. 磁性氧化铁纳米颗粒在不同性质分散剂作用下的聚合状态[J]. 环境化学, 2018, 37(2): 327-334. doi: 10.7524/j.issn.0254-6108.2017071202
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XU Qijing, GHOSH Saikat, WANG Peng, GUO Binglin, GUO Qianyue, GUO Jin. Aggregation of magnetic iron oxide nanoparticles under dispersants with differentproperties[J]. Environmental Chemistry, 2018, 37(2): 327-334. doi: 10.7524/j.issn.0254-6108.2017071202
Citation: XU Qijing, GHOSH Saikat, WANG Peng, GUO Binglin, GUO Qianyue, GUO Jin. Aggregation of magnetic iron oxide nanoparticles under dispersants with differentproperties[J]. Environmental Chemistry, 2018, 37(2): 327-334. doi: 10.7524/j.issn.0254-6108.2017071202
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磁性氧化铁纳米颗粒在不同性质分散剂作用下的聚合状态

  • 1.

    昆明理工大学, 环境科学与工程学院, 昆明, 650500;

  • 2.

    云南省红河哈尼族彝族自治州环境保护局, 红河, 661100

  • 基金项目:

    国家自然科学基金（41573100）资助.

Aggregation of magnetic iron oxide nanoparticles under dispersants with differentproperties

  • 1.

    Faculty of Environmental Science and Engineering, Kunming University of Science & Technology, Kunming, 650500, China;

  • 2.

    Yunnan Honghe environmental protection agency, Honghe, 661100, China

  • Fund Project: Supported by the National Natural Science Foundation of China(41573100).

  • 摘要: 磁性氧化铁（γFe2O3）纳米颗粒广泛应用导致其进入环境中引起环境风险.由于本身固有的磁极力作用，γFe2O3纳米颗粒在水相环境中极易聚合沉降.然而，自然环境中广泛存在的有机物，包括胡敏酸（HA）和球状蛋白质如牛血清蛋白（BSA），能够极大地加强其胶体稳定性，使之易于在环境中迁移转化，进而增加了环境风险.本研究考察在pH=4时，HA和BSA分别作用下，γFe2O3纳米颗粒胶体稳定性的相对变化.运用动态光散射原理（DLS）分析颗粒的平均水合直径（DH）变化，原位原子力显微镜（AFM）及非原位透射电镜（TEM）等手段考察颗粒的分散情况.结果证实：此pH条件下，两种物质均能在不同程度上使γFe2O3分散.然而，相比于BSA，环境中广泛存在具有低pKa且吸附亲和力较强的HA，能够使γFe2O3纳米颗粒的分散性更好，其产生的环境风险也更大.
    Abstract: Magnetic iron oxide nanoparticles(γFe2O3) have inevitably entered the environment and may couse environmental risk due to their widespread applications in different disciplines. These nanoparticles can easily to aggregate and settle because of their intrinsic magnetic dipolar force in the aqueous environment. However,their colloidal stability can be greatly enhanced by interactions with naturally ubiquitous organic matter including humic acid (HA) and globular proteins such as bovine serum albumin (BSA). The dispersed nanoparticles migrate were easily in the environment and increase environmental risk. In this study,the relative variation of γFe2O3 colloidal stabilization by the interaction with HA and BSA at pH 4 was investigated. Dynamic light scattering (DLS) was used to analyze the change of the average hydration diameter (DH) of the particles. The dispersion state of the nanoparticles was investigated by in-situ atomic force microscopy (AFM) and ex-situ transmission electron microscopy (TEM). Results confirmed that γFe2O3 cluster were dispersed to different extent through adsorption with HA and BSA at pH 4. The results show the higher environmental risk from HA with a lower pKa and stronger adsorption affinity which can make γFe2O3 better dispersion than that of BSA.
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  • 收稿日期:  2017-07-12
  • 刊出日期:  2018-02-15

磁性氧化铁纳米颗粒在不同性质分散剂作用下的聚合状态

  • 1.  昆明理工大学, 环境科学与工程学院, 昆明, 650500;
  • 2.  云南省红河哈尼族彝族自治州环境保护局, 红河, 661100
  • 收稿日期:  2017-07-12
基金项目:

国家自然科学基金（41573100）资助.

摘要: 磁性氧化铁（γFe2O3）纳米颗粒广泛应用导致其进入环境中引起环境风险.由于本身固有的磁极力作用，γFe2O3纳米颗粒在水相环境中极易聚合沉降.然而，自然环境中广泛存在的有机物，包括胡敏酸（HA）和球状蛋白质如牛血清蛋白（BSA），能够极大地加强其胶体稳定性，使之易于在环境中迁移转化，进而增加了环境风险.本研究考察在pH=4时，HA和BSA分别作用下，γFe2O3纳米颗粒胶体稳定性的相对变化.运用动态光散射原理（DLS）分析颗粒的平均水合直径（DH）变化，原位原子力显微镜（AFM）及非原位透射电镜（TEM）等手段考察颗粒的分散情况.结果证实：此pH条件下，两种物质均能在不同程度上使γFe2O3分散.然而，相比于BSA，环境中广泛存在具有低pKa且吸附亲和力较强的HA，能够使γFe2O3纳米颗粒的分散性更好，其产生的环境风险也更大.

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