| Mg(BO2)2在MgCl2水溶液中的相平衡与化学平衡 | |
| Phase Equilibria and Chemical Equilibrium of Mg(BO2)2 in MgCl2 Aqueous Solution | |
| 摘要: 借助拉曼光谱和X射线衍射（XRD）检测手段，对Mg（BO2）2在MgCl2水溶液中水解的固液相平衡与物种化学平衡规律进行了研究。结果表明，MgCl2对Mg（BO2）2的溶解转化、多硼氧配阴离子的物种分布有很大影响：（1）随着MgCl2浓度从0达到饱和，Mg（BO2）2的表观饱和浓度从0.79%增加到1.96%，pH值从9.96降到6.27；（2）Mg（BO2）2在纯水中水解形成固相Mg2B6O11·15H2O和Mg（OH）2，在MgCl2溶液中形成固相Mg2B6O11·15H2O和Mg3Cl2（OH）4·4H2O；（3）Mg（BO2）2在纯水中水解，硼的物种主要为B4O5（OH）42-和B3O3（OH）4-，分别占液相总硼含量的49.81%和19.54%。在MgCl2饱和溶液中，主要为B3O3（OH）4-和B5O6OH）4-，分别占液相总硼含量的44.57%和40.00%。 | |
| 关键词: Mg(BO2)2 MgCl2 拉曼光谱 化学平衡 溶液结构 | |
| 基金项目: 国家自然科学基金（No.U1407204，U1707602）、天津市教委创新研究团队（No.TD12-5004）和天津市海洋资源与化学重点实验室开放基金（No.201602）资助。 | |
| Abstract: The solid liquid phase equilibria and species chemical equilibrium of Mg(BO2)2 dissociated in MgCl2 aqueous solution were studied by means of Raman spectroscopy and X ray diffraction (XRD). The results indicate that the MgCl2 concentration has a great influence Mg(BO2)2 dissociation. (1) With the increasing of MgCl2 concentration from 0 to saturated state, the apparent solubility of Mg(BO2)2 increased from 0.79% to 1.96%, and pH value decreased from 9.96 to 6.27; (2) Solid species are changed gradually from Mg2B6O11·15H2O and Mg(OH)2, to Mg2B6O11·15H2O and Mg3Cl2(OH)4·4H2O; (3) Main species of polylobate anions change from B4O5(OH)42- and B3O3(OH)4- with the accounts of 49.81% and 19.54%, to B3O3(OH)4- and B5O6OH)4- with accounts of 44.57% and 40.00%, respectively. | |
| Keywords: magnesium metaborate magnesium chloride Raman spectroscopy chemical equilibrium solution structure | |
| 投稿时间：2019-10-19 修订日期：2020-04-13 | |
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| 李瑶瑶,周桓,王星帆,吴鹏,张敏,李文轩,阎波.Mg(BO2)2在MgCl2水溶液中的相平衡与化学平衡[J].无机化学学报,2020,36(8):1421-1429. | |
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