氯柱硼镁石在氯化镁水溶液中相转化平衡液相的红外光谱分析

FTIR Spectral Analysis of Saturated Solution During Dissolution and Transformation of Chloropinnoite in Magnesium Chloride Solution

采用差示FTIR光谱技术,研究了氯柱硼镁石在30℃下浓度为0.5,12和18％MgCl_2水溶液中溶解及相转化平衡饱和水溶液中硼氧配阴离子的FTIR光谱。给出了溶液中硼氧配阴离子的FTIR光谱振动频率的归属,515cm^(-1)为单和二硼氧配阴离子特征峰,630cm^(-1)为三硼氧配阴离子特征峰,550cm^(-1)为四硼氧配阴离子特征峰。对饱和水溶液中硼氧配阴离子的存在形式及其相互作用以及与相转化析出固相的关系进行了讨论。

FTIR differential spectroscopy was used to identify the polyborate ions in saturated aqueous solutions during dissolution and transformation of 2MgO.2B(2)O(3).MgCl2.14H(2)O in 0.5%, 12%, and 18% MgCl2 solutions at 30degreesC, respectively. The recorded IR spectroscopic frequencies of the borate aqueous solution subtracted that of water as a blank value and their assignments were given. The bands at about 515, 630 and 550 cm(-1) are characteristics of B(OH)(4)(-)/B2O(OH)(6)(2-) ,B3O3(OH)(4)(-)/B3O3(OH)(5)(2-) , and B4O5(OH)(4)(2-) , respectively. The existing forms of polyborate anions in saturated aqueous solutions and their interaction have been discussed. The relations between the existing forms of polyborate anions and the crystallizing solid phases have been obtained.