物理化学学报 >> 2016, Vol. 32 >> Issue (11): 2794-2802.doi: 10.3866/PKU.WHXB201609073

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埃洛石纳米管稳定的Pickering高内相乳液模板制备大孔聚合泡沫吸附分离三氟氯氰菊酯

陈香,潘建明*(),闫永胜   

  • 收稿日期:2016-08-02 发布日期:2016-11-08
  • 通讯作者: 潘建明 E-mail:pjm@ujs.edu.cn
  • 基金资助:
    国家自然科学基金(21574091);国家自然科学基金(21576120);国家博士后基金(2013M540423)

Adsorption of λ-Cyhalothrin onto Macroporous Polymer Foams Derived from Pickering High Internal Phase Emulsions Stabilized by Halloysite Nanotube Nanoparticles

Xiang CHEN,Jian-Ming PAN*(),Yong-Sheng YAN   

  • Received:2016-08-02 Published:2016-11-08
  • Contact: Jian-Ming PAN E-mail:pjm@ujs.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21574091);the National Natural Science Foundation of China(21576120);National Postdoctoral Science Foundation, China(2013M540423)

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摘要：

利用天然粘土埃洛石纳米管和少量非离子表面活性剂吐温80为乳化剂构建了水包油（O/W）型Pickering高内相乳液（HIPEs），并以其为模板制备了大孔聚合泡沫（MPFs）。MPFs具有开口的大孔结构、丰富的内部交联孔道和亲水的表面，且在水中呈悬浮状态，这些特点均有利于吸附水体系中的菊酯类农药。结合静态吸附实验研究了MPFs吸附三氟氯氰菊酯的平衡与动力学行为。结果表明，准一级动力学方程与Langmuir等温方程分别较好地拟合了吸附动力学与平衡数据（相关性系数（R2）>0.99），证明了吸附过程是一个单分子层的化学吸附过程。298 K时MPFs对三氟氯氰菊酯的吸附平衡时间和饱和吸附容量分别为240 min和23.98 μmol·g-1，且吸附容量随着温度与三氟氯氰菊酯初始浓度的升高而逐渐增大。研究证明了水中呈悬浮状态的MPFs是理想和稳定的吸附剂，可有效去除水溶液中疏水性有机污染物。

关键词: 吸附, 大孔聚合泡沫, 埃洛石纳米管, 动力学, Pickering高内相乳液

Abstract:

Macroporous polymer foams (MPFs) were prepared through oil-in-water (O/W) Pickering high internal phase emulsions (HIPEs) stabilized by the natural clay halloysite nanotube (HNT) nanoparticles with the addition of small amounts of the nonionic surfactant Tween 85. The resulting MPFs were characterized, and the results showed an open cell structure with interconnected pores and a hydrophilic surface with a suspended state in aqueous solution. These features were beneficial for the adsorption of pyrethroids. Moreover, the adsorption of λ-cyhalothrin on MPFs was examined to determine the kinetic and equilibrium data of the adsorption process. The findings of the kinetic and equilibrium studies revealed that a pseudo-second-order kinetic model and the Langmuir isotherm were the best fitted models (R2>0.99), implying that the process of adsorption is a monolayer and chemically reactive. In addition, the maximum adsorption capacity and equilibrium time for λ-cyhalothrin on MPFs were estimated to be 23.98 μmol·g-1 and 240 min at 298 K. Increasing the temperature led to an increase in adsorption capacity. Increasing the initial concentration of λ-cyhalothrin led to an increase in clear adsorption capacity. Finally, the suspended MPFs represent a promising and reliable adsorbent for the removal of hydrophobic organic pollutants from aqueous solutions.

Key words: Adsorption, Macroporous polymer foam, Halloysite nanotube, Kinetics, Pickering high internal phase emulsion