Distribution of aluminum species and the characteristics of structure of poly-aluminum-chloride-sulfate (PACS)

Article type: Research Article

Authors: Gao, Bao-yu | Yue, Qin-yan | Yu, Hui | Wang, Yan

Affiliations: Department of Environmental Engineering, Shandong University,Jinan 250100, China. E-mail: [email protected]

Abstract: A series of poly-aluminum-chloride-sulfate (PACS), which have different basicities (γ) and Al³^+/SO_4²^- molar ratio, have prepared and dried at 105°C and 65°C, respectively. The distribution of aluminum species of PACS was examined, and the effect of γ value, Al³^+/SO_4²^- molar ratio, dilution on the distribution of aluminum species of PACS was also investigated by using Al-ferron timed complex calorimetric method. The IR spectroscopy and X-ray diffraction were used to study the effect of γ value, Al³^+/SO_4²^- molar ratio and the drying temperature on the structure of PACS. The experimental results show that Al³^+/SO_4²^-molar ratio has a great effect on the distribution of aluminum species, but the dilution has a little effect on the distribution of aluminum species. The lower the Al³^+/SO_4²^-molar ratio, the higher the proportions of the polymer and colloidal species in PACS. The polymeric degree of PACS was related to value and Al³^+/SO_4²^-molar ratio. Drying temperature has an influence on the structure and thesolubility of solid PACS products.

Keywords: flocculant PACS, species, structure, Al-ferron timed complex calorimetric method, X-ray diffraction, IR spectroscopy

Journal: Journal of Environmental Sciences, vol. 13, no. 1, pp. 108-114, 2001