Purification and characterization of Al13 species in coagulant polyaluminum chloride

In order to investigate the characteristic of pure Nano-Al-13, Nano-Al-13 was separated and purified by four methods. The Nano-Al-13 was characterized by Al-Ferron timed complexation spectrophotometer, Al-27-NMR and transmission electron microscopy (TEM), respectively. Coagulation efficiency of Nano-Al-13, PAC, and AlCl3 in synthetic water was also investigated by Jar tests. And the dynamic process and aggregation state of kaolin suspensions coagulating with Nano-Al-13, PAC, and AlCl3 were investigated by using a photometric dispersion analyzer 2000 (PDA2000). The experimental results indicated that the efficiency of gel column chromatography method was the highest in low concentration, ethanol and acetone method was simple and could. separated PAC solution with different concentrations, while silicon alkylation white block column chromatography method could separate PAC solution with low concentration, and SO42-/Ba2+ displacement method could separated PAC solution with high concentration, but extra inorganic cation and anion could be introduced into the solution during separating. The coagulation efficiency and dynamic experimental results showed that Nano-Al-13 with a high positive-charged species was effective in remove turbidity and it was the main species of electric neutralization in coagulation process, and could increase greatly the effective collision rate between particles, and its coagulation speed and the particle size of coagulant formed were of greatest value the test conditions.