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Characterization and coagulation of a polyaluminum chloride (PAC) coagulant with high Al13 content
Journal of Environmental Management,-0001,():
A polyaluminum chloride (PAC) coagulant was prepared from AlCl3•6H2O and Na2CO3. The Al13 species in PAC was separated and purified by the SO4 2-/Ba2+ deposition-replacement method, and characterized by 27Al-NMR and XRD. From 27Al-NMR spectroscopy, it was found that PAC obtained after separation and purification contained more Al13 (PAC-Al13, for short) than original PAC before separation and purification. In XRD spectra, a strong Al13 signal appeared in the range of 2θfrom 5°to 25°. Jar tests were performed to test the coagulation efficiency of AlCl3, PAC and PAC-Al13 in treating synthetic or actual water samples. Compared with PAC and AlCl3, PAC-Al13 gives the best results for turbidity, humic acid and color removal, and achieves the highest charge-neutralizing ability. Under the study conditions, PAC-Al13 gave about 90% humic acid removal and almost 100% dye reactive blue removal when its dosages were 4.0mg/L and 15mg/L as Al, respectively. Al13 species is a higher positive-charged and most effective polymeric Al species in water and wastewater treatment.
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