【摘要】 以相同Al1 3含量、不同浓度的PAC为原料,利用乙醇 丙酮混合溶剂法、SO2 - 4 Ba2 + 沉淀置换法以及柱层析法分离提纯纳米Al1 3形态,同时利用Al Ferron逐时络合比色法、2 7Al NMR等多种现代分析手段进行分析鉴定,比较其分离效果,并采用烧杯实验法和透光率脉动检测技术对Al1 3形态以及PAC、AlCl3的絮凝效果及絮凝过程中絮集物形成和增长的变化差异作了对比性研究.实验结果表明,乙醇 丙酮混合溶剂法对Al1 3分离纯化效果最好,分离所得Al1 3平均粒径大,聚合程度高.柱层析法受柱体积的影响只对低浓度的PAC有较好的分离效果;SO2 - 4 Ba2 + 沉淀置换法虽具有较好的分离效果,但分离过程有其他杂质离子的加入,影响到产品品质.混凝效果和动态实验结果表明,Al1 3形态是在絮凝过程中起电中和作用的主要形态,具有较强的除浊及脱色能力,在混凝过程中当絮体受到剪切力的破坏时Al1 3形态比PAC和AlCl3具有更强重新絮凝的能力更多还原

【Abstract】 The Al 13 species were separated and purified from a series of poly-aluminum chloride（PAC） solutions, which had the same Al 13 percentage and different total Al concentration, by using column chromatography method, ethanol-acetone resolving method, and SO 2-₄/Ba 2+ displacement method. The Al 13 species yield was characterized by Al-Ferron timed complexation spectrophotometry, 27Al-NMR and ZATESIZER 3000HSA. Coagulation efficiency of Al 13, PAC and AlCl₃ in synthetic water was also compareed by Jar tests. And the dynamic process and aggregation state of Kaolin suspensions coagulating with the three coagulants were investigated by using a photometric dispersion analyzer （PDA）. The experimental results indicated that, the precipitation with ethanol-acetone resolving method gave the best Al 13 separation results comparing with the other two methods. And the mean particle diameter of Al 13 species was the biggest, and the polymerization degree was the highest. Moreover, column chromatography method could give better separation efficiency only for low concentration of PAC. Impurity ions could be inducted by SO 2-₄/Ba 2+ displacement method. The coagulation effects and dynamic experimental results showed that the Al 13 was a high positive-charged species and was good at turbidity and color removal. The dynamic process results showed that the Al 13 species also had the best recovery capability from shear-broken than PAC and AlCl₃, because its conformation could take more effective in charge neutralization.更多还原