Preparation of Microcapsules Containing PC-88A with Interconnected Spherical Pores and Their Extraction Properties for Zn(II)
Preparation of Microcapsules Containing PC-88A with Interconnected Spherical Pores and Their Extraction Properties for Zn(II)
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DOI：
10.15261/serdj.18.123
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发表时间：
2011-01-01
影响因子：
0.7
通讯作者：
Shiomori, Koichiro
中科院分区：
文献类型：
--
作者：
Matsushita, Asuka;Sana, Takashi;Shiomori, Koichiro
2-采用W/O/W乳液体系原位聚合法对Zn（II）的有效萃取剂乙基己基膦酸单2-乙基己酯（PC-88 A）进行微胶囊化。以二乙烯基苯为壁材，采用自由基聚合法在有机相中进行聚合。成功制备了具有大连通球形孔的微胶囊。微胶囊的孔径和直径随着内水相中NaCl浓度的增加而增加。微胶囊的直径几乎恒定在230 μ m左右，并且与有机相中PC-88 A的浓度无关。在所有制备条件下，PC-88 A在微囊中的包封率均大于80%。使用含有PC-88 A的微胶囊的Zn（II）的提取在pH值大于2时急剧增加。在pH值小于2时，微胶囊中提取的Zn（II）被成功地反萃取。通过定量分析提取的Zn（II）的最大量与包封在微胶囊中的PC-88 A的量之间的关系，证实了两个分子的PC-88 A与一个Zn（II）离子反应。微胶囊内部形成的相互连接的球形孔加快了Zn（II）的萃取速率。
2-Ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A), which is an effective extractant of Zn(II), was microencapsulated by in situ polymerization in a W/O/W emulsion system. Divinylbenzene was used as the wall material and polymerized in the organic phase by free radical polymerization. Microcapsules with large interconnected-spherical pores were successfully prepared. The pore size and the diameter of the microcapsules increased with increasing NaCl concentration in the inner aqueous phase. The diameter of the microcapsules was almost constant at around 230 mu m and was independent of the concentration of PC-88A in the organic phase. The entrapment efficiency of PC-88A in the microcapsules was higher than 80% for all preparation conditions. The extraction of Zn(II) using the microcapsules containing PC-88A sharply increased at pH values greater than 2. Zn(II) extracted in the microcapsules was successfully back-extracted at pH values less than 2. It was confirmed that two molecules of PC-88A reacted with one Zn(II) ion by quantitative analysis of the relationship between the maximum amounts of Zn(II) extracted and the amount of PC-88A encapsulated in the microcapsules. The extraction rate of Zn(II) was accelerated by the formation of interconnected-spherical pores inside the microcapsules.