拟薄水铝石制备条件对其表面羟基性质的影响

The influence of preparation conditions on the surface hydroxyl properties of pseudo boehmite

采用连续法制备拟薄水铝石,考察拟薄水铝石制备条件对其表面羟基性质的影响,并采用红外光谱等分析样品的表面羟基类型及含量。结果表明,合成条件对羟基的比例影响较大,尤其是Ⅲ型羟基(中性)的范围变化较大,最高为N-4样品的94.61%,最低为N-16样品的31.84%。羟基峰面积的改变导致羟基峰的位置也发生了不同程度的偏移,且基本表现为3680 cm^(-1)峰位和/或3730 cm^(-1)峰位减小,3730 cm^(-1)峰位和/或3790 cm^(-1)峰位增加的趋势。

A continuous method was used to prepare pseudo boehmite,and corresponding orthogonal experiments were designed to investigate the effect of preparation conditions on the surface hydroxyl properties of pseudo boehmite.The types and contents of surface hydroxyl groups in the obtained samples were analyzed by infrared spectroscopy and other methods.The results show that the synthesis conditions have a significant impact on the proportion of hydroxyl groups,especially the range of typeⅢhydroxyl groups(neutral)with the highest value 94.61%of N-4 and the lowest 31.84%of N-16.The change in hydroxyl peak area leads to varying degrees of shift in the position of the hydroxyl peak,which is generally manifested as a decrease in the 3680 cm^(-1)peak and/or 3730 cm^(-1)peak,and an increase in the 3730 cm^(-1)peak and/or 3790 cm^(-1)peak.