硫酸根对羟基氯化铝羟桥聚合的影响

Effect of Sulfate Ions on the Olation Polymerization of Hydroxyaluminum Chloride

本文用试铁灵法和^(27)Al NMR谱研究了SO_4^(2-)对羟基氯化铝羟桥聚合的影响。试铁灵法表明增加SO_4^(2-)则球簇离子[AlO_4Al_(12)(OH)_(24)(H_2O)_(12)]^(7+)(Al_(23))含量减少,而NMR法进一步说明Al_(13)的减少是由于Al_(13)中的AlO_4被SO_4^(2-)所取代而形成新的球簇离子[SO_4Al_(12)(OH)_(24)(H_2O)_(12)]^(10+)所造成的。比较两种方法的结果表明Al_(13)含量随SO_4^(2-)增加而减少的速率与制备聚羟基氯化铝方法密切相关。

In this paper, the ferron method and ^(27)Al NMR spectroscopy were used toinvestigate the effect of SO_4^(2-) on the olation polymerization of hydroxyalu-minum chloride. The ferron method shows that the content of[AlO_4Al_(12)(OH)_(24)(H_2O)_(12)]^(7+)(Al_(13)) decreases with increasing SO_4^(2-) while ^(27)Al NMRspectra demonstrate further that the decrease of Al_(13) is due to the substitutionof AlO_4 in the spherical cluster polyion Al_(13) by SO_4^(2-), resulting in a newcluster polyion [SO_4Al_(12)(OH)_(24)(H_2O)_(12)]^(10+). In comparison of the results of thesetwo methods it was found that the rate of decrease of Al_(13) with the increaeof SO_4^(2-) is related closely to the method of preparation of polyhydroxyaluminumchloride.