Morphology and electrical conductivity of PACS

Article type: Research Article

Authors: Gao, Bao-yu | Liu, Zong-gang | Yue, Qin-yan | Zhao, Hua-zhang

Affiliations: Department of Environmental Engineering, Shandong University, Jinan 250100, China | Environmental Monitoring Station of Huaiyin, Jinan 250022, China

Abstract: Polyaluminium chlorides with sulfate ion(PACS) were prepared by using AlCl_3· 6H_2O, Al(SO_4 )_3· 18H_2O and Na_2CO_3 as raw materials. The effects of basicity (r), Al^3 +/SO_4^2- molar ratio and aging time on the morphology of PACS were observed by transmission electrical microscope. The influence of aging time on charge neutralization and coagulation effect of PACS was studied.The effects of basicity (r), Al^3+/SO_4^2- molar ratio and aging time on the electrical conductivity of PACS solution were also investigated. The experimental results show that the degree of polymerization of polyaluminium chloride(PAC) increases when SO_4^2-ion is added. The higher the basicity(r) and the longer the aging time, the larger the size of polymer PACS. The ability of PACS neutralizing the charge on Kaolinite decreases with the increase of aging time. The electrical conductivity of PACS solution (the concentration of Al^3+ ion is 0.18 mol/L) with different aging time is the function of the basicity and Al^3 +/SO_4^2- molar ratios and has its maximum at r = 0.5 and Al^3+/SO_4^2 = 12.

Keywords: coagulant PACS, morphology, transmission electron microscope, electrical conductivity, coagulation

Journal: Journal of Environmental Sciences, vol. 12, no. 3, pp. 319-324, 2002