| 离子液体微乳液合成纳米AgCl及AgCl/poly(MMA-co-St)杂化膜性能调控 |
| Synthesis of AgCl Nanoparticles in Ionic Liquid Microemulsion and Regulation of AgCl/poly(MMA-co-St) Hybrid Membranes |
|
| 摘要: 在以离子液体氯化-1-十二烷基甲基咪唑（C12mimCl）为表面活性剂，甲基丙烯酸甲酯（MMA）与苯乙烯（St）混合物为油相介质的反相微乳液中合成AgCl纳米粒子，进而采用微乳液原位聚合法制备AgCl/poly（MMA-co-St）杂化膜。通过紫外可见光谱和透射电镜分析了微乳液组成（油相介质组成和增容水量ω）对纳米AgCl粒子形貌的影响。结合扫描电镜和苯、环已烷的溶胀实验探讨了微乳液组成对杂化膜性能的调控作用。结果发现，微乳液油相介质中St/MMA体积比增大有利于在微乳液和杂化膜中获得更多纳米AgCl粒子，增加了杂化膜的苯平衡溶胀吸附量（A∞，b）与苯/环已烷的平衡溶胀吸附选择性（αs，b/c）。在St/MMA体积比为1：3时杂化膜的A∞，b和αs，b/c分别达到330mg·g-1和19.21；但过多苯乙烯加入油相介质，其苯环中π键会破坏水核中AgCl粒子的稳定性而引起粒子团聚，从而降低了杂化膜的A∞，b和αs，b/c。反相微乳液中合成的纳米AgCl粒子量随ω增大而增多、粒径增大，杂化膜的A∞，b和αs，b/c随ω的增加而增大。但过高的ω导致微乳液中出现AgCl大粒子，从而引起杂化膜的A∞，b和αs，b/c下降。 |
| 关键词: 氯化-1-十二烷基甲基咪唑 微乳液 纳米AgCl粒子 杂化膜 溶胀吸附性能 |
| 基金项目: 国家自然科学基金（No.20876144，21076190and21376218）资助项目。 |
| Abstract: To obtain high performance membranes of polymer-silver salt complexes for the separation of aromatic/aliphatic hydrocarbons, a novel preparation method of AgCl/polymer hybrid membranes has been reported. AgCl nanoparticles were first synthesized in a water-in-oil (W/O) microemulsion, AgCl/polymer hybrid membranes are subsequently prepared via microemulsion in-situ polymerization. In the preparation of AgCl/polymer hybrid membranes, the composition of the microemulsion could not only affect the morphology of AgCl nanoparticles, but also regulate the performance of the hybrid membranes. In this paper, AgCl nanoparticles were synthesized in W/Omicroemulsion using the ionic liquid 1-dodecyl-3-methyl imidazoium chloride (C12mimCl) as the surfactant and methyl methacrylate-styrene (MMA-St) mixture as the oil phase. Aqueous AgNO3 solution was added to the microemulsion as the source of Ag+ ions. Then, AgCl/poly(MMA-co-St) hybrid membranes were prepared by microemulsion in situ polymerization. The influence of the ratio of St to MMAin the oil phase and molar ratio of water to surfactant (ω) on the morphology of AgCl nanoparticles in the microemulsion were characterized by UV-visible spectroscopy (UV-Vis) and transmission electron microscopy (TEM). The scanning electron microscopy (SEM) and the swelling-sorption experiments of the hybrid membranes were employed to explore the relationship between the composition of the microemulsion and the membrane performance. The results showed that the increase in the ratio of St to MMAin the oil phase depressed the polarity of the oil phase, which led to the formation of more AgCl nanoparticles with good dispersion in the hybrid membrane. And these increased significantly the equilibrium swelling-sorption degree in benzene (A∞,b) and the swelling-sorption selectivity of benzene to cyclohexane (αs,b/c) of AgCl/poly(MMA-co-St) hybrid membranes. While the ratio of St to MMAin the oil phase was 1:3, A∞,b and αs,b/c reached 330 mg·g-1 and 19.21. When excess styrene was added to the oil phase, the stability of W/Omicroemulsion was reduced and large AgCl particles generated in the microemulsion, which significantly decreased A∞,b and αs,b/c of AgCl/poly(MMA-co-St) hybrid membranes. The increase of ω resulted in the formation of more AgCl nanoparticles in the microemulsion, which enhanced A∞,b and αs,b/c of AgCl/poly(MMA-co-St) hybrid membranes. When ω was more than5, A∞,b and αs,b/c of AgCl/poly(MMA-co-St) hybrid membranes decreased because of the aggregation of AgCl particles. |
| Keywords: C12mimCl ionic liquid microemulsion AgCl nanoparticles hybrid membrane swelling-sorption performance |
| 投稿时间：2013-06-18 修订日期：2013-09-25 |
| 摘要点击次数: 1573 |
| 全文下载次数: 1932 |
| 丁龙飞,王挺,吴礼光.离子液体微乳液合成纳米AgCl及AgCl/poly(MMA-co-St)杂化膜性能调控[J].无机化学学报,2014,30(2):323-330. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
