利用拉曼光谱对硼酸镁在蒸发、稀释和结晶过程中的动力学及机理进行研究。
Investigations on Mg-borate kinetics and mechanisms during evaporation, dilution and crystallization by Raman spectroscopy.
作者信息
Peng Jiaoyu, Chen Jing, Dong Yaping, Li Wu
机构信息
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China; Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, China.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China; Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, China; University of Chinese Academy of Sciences, Beijing 10049, China.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Jun 15;199:367-375. doi: 10.1016/j.saa.2018.03.063. Epub 2018 Mar 27.
Raman spectra of boron-concentrated, diluted, and corresponding mother solutions of brine were recorded at 298.15 K. The main polyborate anions present and their interactions in brine during evaporation and dilution were proposed according to the Raman spectra. The polyborate anions B(OH), BO(OH), BO(OH), and BO(OH) were found to be the main forms in boron-concentrated brine with BO(OH) ion being the principal form. Diluting brines with water accelerated depolymerization of BO(OH) and BO(OH) anions into B(OH) and BO(OH) ions and generated OH ions, causing the pH of the solutions to increase from 4.2 to almost 8.0. Mg-borates precipitated from all diluted solutions could be classified as either hexaborates or triborates. A mechanism of solid phase transformation was also proposed and discussed based on Raman spectra analysis and solid species and solution pH data.
在298.15 K下记录了富硼、稀释后的卤水及其相应母液的拉曼光谱。根据拉曼光谱，提出了蒸发和稀释过程中卤水中存在的主要多硼酸根阴离子及其相互作用。发现多硼酸根阴离子B(OH)₄⁻、BO(OH)₃⁻、BO(OH)₂⁻和BO(OH)₃²⁻是富硼卤水中的主要存在形式，其中BO(OH)₃⁻离子是主要形式。用水稀释卤水会加速BO(OH)₃⁻和BO(OH)₂⁻阴离子解聚为B(OH)₄⁻和BO(OH)₃⁻离子，并产生OH⁻离子，导致溶液的pH值从4.2增加到近8.0。从所有稀释溶液中沉淀出的镁硼酸盐可分为六硼酸盐或三硼酸盐。还基于拉曼光谱分析以及固相物质和溶液pH数据，提出并讨论了固相转变机理。
Zotero 插件