Zhang Panyue, Hahn Hermann H, Hoffmann Erhard, Zeng Guangming
Department of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
Chemosphere. 2004 Dec;57(10):1489-94. doi: 10.1016/j.chemosphere.2004.08.066.
Aluminium ions hydrolyse and polymerise into different species in water. Main aluminium species in aluminium coagulant solutions are monomeric Al species (Al1) and polymeric Al species Al13O4(OH)24(7+) (Al13). The aluminium species distribution in coagulant solutions can be influenced by many parameters. This paper studies influences of concentrations of total aluminium species (Al(t)) and other species--OH-, polysilicic acid and ferric species, which were added in aluminium coagulant solutions, on the aluminium species distribution through 27Al nuclear magnetic resonance (NMR) analysis. Results show that only Al1 and no Al13 exist in coagulant solutions at higher Al(t) concentrations (over 1 mol l(-1)), while both species exist at lower Al(t) concentrations (0.1 mol l(-1)). The increase of OH/Al value (molar ratio) increases the concentration of Al13 in coagulant solutions, while the addition of polysilicic acid and ferric species decreases the concentration of Al13.
铝离子在水中水解并聚合成不同的形态。铝混凝剂溶液中的主要铝形态是单体铝形态（Al1）和聚合铝形态Al13O4(OH)24(7+)（Al13）。混凝剂溶液中铝形态的分布会受到许多参数的影响。本文通过27Al核磁共振（NMR）分析研究了总铝形态（Al(t)）浓度以及添加到铝混凝剂溶液中的其他形态——OH-、聚硅酸和铁形态对铝形态分布的影响。结果表明，在较高的Al(t)浓度（超过1 mol l(-1)）下，混凝剂溶液中只存在Al1而不存在Al13，而在较低的Al(t)浓度（0.1 mol l(-1)）下两种形态都存在。OH/Al值（摩尔比）的增加会提高混凝剂溶液中Al13的浓度，而聚硅酸和铁形态的添加会降低Al13的浓度。
