甘露醇对铝酸钠溶液自发分解过程影响的r光谱法研究

摘要

Ultraviolet spectrum, infrared spectrum, Raman spectrum were used to investigate the structure change and the spontaneous decomposition of sodium aluminate solution ( kα =1.55, c(Na2O)=100 g/L) by adding different concentrations of mannitol. The results show that the UV absorption peak at 260 nm (Al2O(OH)62-) changes obviously in the decomposition process of sodium aluminate solution with mannitol. The intensities of the Raman scattering peaks at 620, 540 and 720 cm-1 referring to Al(OH)4- and Al2O(OH)62- and that of the IR absorption peak at 720 cm-1 referring to Al(OH)4- are reduced. Combing with quantum chemical calculation, it can be concluded that mannitol is interacted with Al(OH)4- and Al2O(OH)62- through hydrogen bonding, so as to inhibit the decomposition of sodium aluminate solution.%利用紫外光谱、红外光谱、拉曼光谱分析方法,研究添加不同浓度甘露醇的铝酸钠溶液(kα=1.55,c(Na2O)=100 g/L)结构变化及自发分解过程.结果表明:添加甘露醇后,铝酸钠溶液分解过程中,位于260 nm处(Al2O(OH)62-)的紫外吸收峰变化明显;位于620、540和720 cm-1处(Al(OH)4-、Al2O(OH)62-)的拉曼散射峰和位于720 cm-1处(Al(OH)4-)红外吸收峰强度均减弱.结合量子化学计算,发现甘露醇通过氢键与Al(OH)4-、Al2O(OH)62-相互作用,从而抑制铝酸钠溶液分解.