| 聚合氯化铝中纳米Al13形态的分离纯化及形态表征 |
| 摘要点击 874 全文点击 1227 投稿时间：2003-10-30 修订日期：2004-01-09 |
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| 中文关键词 Al13形态 分离纯化 聚合氯化铝(PAC) 形态表征 |
| 英文关键词 Al13 species separation and purification polyaluminum chloride(PAC) characterization of morphology |
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| 中文摘要 |
| 采用超滤法和层析法分离纯化聚合氯化铝(PAC)中的Al13形态,并采用Al-Ferron逐时络合比色法、27Al-NMR、TEM和粒度测定仪对分离纯化所得的Al13形态进行了分析和表征.研究结果表明,超滤法分离纯化的效果受超滤膜的孔径及PAC浓度的影响,选择合适孔径的膜和PAC溶液浓度即可以获得高纯度的Al13,在层析法中则随着洗脱时间延长按分子的大小依次洗脱下来,因此截取中间组分即可得到Al13;Al-Ferron逐时络合比色法和27Al-NMR的分析结果表明,采用上述2种方法分离提纯得到的样品中Al13的含量分别可达到90%以上和100%.TEM和粒度测定结果表明,在B=2.5的PAC溶液中,Al13极少以Al12AlO4(OH)24(H2O)7+12的单体形态存在,而是呈两维结构的线性和枝状的聚集体,Al12AlO4(OH)24(H2O)7+12的聚集体尺寸通常在几十至几百nm.
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| 英文摘要 |
| The polynuclear Keggin species, Al12AlO4(OH)24(H2O)7+12 (Al 13 ), was firstly separated and purified from polyaluminum chloride (PAC) by the ultra filtration and column chromatography method. The Al13 yield was characterized by Al Ferron timed complexation spectrophotometry, 27Al-NMR,TEM and ZATESIZER 3000HSA.The results showed that the purified sample by the ultra filtration method influenced by membrane pore radius and the concentration of PAC solution. High purity Al13 would be obtained by choosing appropriate membrane and concentration of PAC. When using the column chromatography method, the bigger molecules were eluated first, then the smaller ones. Al13 would be obtained by taking out the middle educt. From Al Ferron timed complexation spectrophotometry, it was found that the obtained sample contained more than 90% and 100% of Al13 by using the two methods mentioned above respectively. The TEM and ZATESIZER 3000HSA results showed that Al13 was mainly aggregated as line type and branch type in B=2.5 solution, and the size was about several decade and several hundred nm. |
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