(中南大学 化学化工学院，长沙 410083)
摘 要: 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( =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。
关键字: 铝酸钠溶液；自发分解；添加剂
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:Ultraviolet spectrum, infrared spectrum, Raman spectrum were used to investigate the structure change and the spontaneous decomposition of sodium aluminate solution ( =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.
Key words: sodium aluminate solution; spontaneous decomposition; additive
