The chemical species distribution and transformation of polyaluminum silicate chloride coagulant

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• 作者：Gao ; Baoyu ; Yue ; Qinyan ; Wang ; Bingjian
• 关键词：Al&ndash ; Ferron complexation timed spectrophotometric method ; ²⁷Al-NMR method ; Basicity (B) ; Al/Si molar ratio
• 刊名：Chemosphere
• 出版年：2002
• 期刊代码：15_00456535
• 类别：env
• 出版时间：February, 2002
• 卷：46
• 期：6
• 页码：809-813
• 文件大小：69.1 K

摘要

The chemical species distributions of polyaluminum silicate chloride (PASC) and polyaluminum chloride (PACl) determined by Al–Ferron complexation timed spectrophotometric and ²⁷Al-NMR methods, respectively, have been compared and analyzed. The experimental results show that the species distribution and transformation of PASC are different from those of PACl, due to the interaction of polysilicic acid and hydrolyzed aluminum species. At the same basicity (B), the contents of, Al_b, Al₁₃ and the monomer species Al_mono (also determined by ²⁷Al-NMR) in PASC are lower than those in PACl, while the contents of Al_c and the Al_other determined by ²⁷Al-NMR in PASC are higher than those in PACl. The differences between PASC and PACl with respect to these species enlarge as the molar ratio of Al/Si in PASC decreases. Further, in PACl the ratio of Al₁₃ to Al_b closes to 1.0, indicating that the amount of the two fractions are similar. In PASC, however, such an agreement does not exist at the lower B values and Al/Si molar ratios. When the B value and Al/Si molar ratios increase, however, the amount of Al₁₃ and Al_b species tends to close. The study findings indicate that polysilicic acid can react with hydrolyzed aluminum species to form an aluminum silicate polymer composite and result in the change in species distribution of PASC.