聚合氯化铝中纳米Al_(13)的层析法分离及其水解过程研究

PURIFICATION OF NANO Al_(13) SPECIES USING GEL-FILTRATION CHROMATOGRAPHY AND ITS HYDROLYZE PROCESS INVESTIGATION

采用聚丙烯酰胺凝胶层析法分离纯化聚合氯化铝(PAC)中的Al13形态,并采用Al-Ferron逐时络合比色法和27Al-NMR对Al13形态进行分析和表征;结果表明,在层析法分离中,随着洗脱时间的延长各种铝形态按分子的大小依次被洗脱下来,因此,截取中间组分即可得到最高含量为99%以上的纳米Al13形态;通过对水解过程的研究可以推断,各种铝形态最终水解产物的粒径多集中在20μm和100μm附近,不同的铝形态到达最终水解产物的速度各不相同,具有最高Alb含量的纳米Al13形态具有较高的水解稳定性.

The polynuclear Keggin species, Al12AlO4 （ OH）24 （H2O）12^7＋（Al13）, was separated and purified from polyaluminum chloride （PAC） by column chromatography method, and characterized by Al-Ferron timed complexation spectrophotometry and 27 Al-NMR methods. The hydrolyze process, the size and the distribution of its hydrolysate were investigated compared with PAC and AlCl3. The results showed that the sample purified by the column chromatography method influenced by the size of the species, the bigger molecules were eluted first, then the smaller ones. The output containing above 99% Al13 species would be obtained by taking out the middle fraction. The results of the hydrolyze process investigation show that the size of the hydrolysates of the different Al species are centralized at 20μm and 100μm. Different Al species has the different hydrolyze speed and the Al13 species is much more steady in hydrolyze process.