化工学报 ›› 2022, Vol. 73 ›› Issue (7): 3038-3044.DOI: 10.11949/0438-1157.20220219

• 催化、动力学与反应器 • 上一篇    下一篇

水热生长碱式硫酸镁纳米线结晶动力学研究

乃学瑛1,2(),吴鹏1,2,3,程远1,2,3,肖剑飞1,2,3,刘鑫1,2,董亚萍1,2   

  1. 1.中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008
    2.青海盐湖资源综合利用技术研究开发中心,青海 西宁 810008
    3.中国科学院大学,北京 100049
  • 收稿日期:2022-02-23 修回日期:2022-05-30 出版日期:2022-07-05 发布日期:2022-08-01
  • 通讯作者: 乃学瑛
  • 作者简介:乃学瑛(1973—),女,博士,副研究员, naixy@isl.ac.cn
  • 基金资助:
    青海省科技厅项目(2019-ZJ-7029);国家自然科学基金柴达木盐湖化工科学研究联合基金项目(U1607101)

Study on hydrothermal crystallization kinetics of magnesium oxysulfate nanowires

Xueying NAI1,2(),Peng WU1,2,3,Yuan CHENG1,2,3,Jianfei XIAO1,2,3,Xin LIU1,2,Yaping DONG1,2   

  1. 1.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, Qinghai, China
    2.Qinghai Technology Research and Development Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, Qinghai, China
    3.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-02-23 Revised:2022-05-30 Online:2022-07-05 Published:2022-08-01
  • Contact: Xueying NAI

摘要:

以硫酸镁和氢氧化钠为原料,邻苯二甲酸氢钾为络合剂,采用络合-水热法制备了碱式硫酸镁纳米线;采用宏观动力学方法结合微观结构分析,进行碱式硫酸镁结晶机理研究。通过分析Mg浓度与时间的变化关系曲线,建立结晶动力学方程;然后根据晶体缺陷分析碱式硫酸镁纳米线表面成核机制。实验结果表明:碱式硫酸镁纳米线在140和160℃结晶机理为多核控制表面生长;在180和200℃时结晶机理发生了变化,转变为线性控制表面生长;碱式硫酸镁纳米线的晶格中存在着较多的刃型位错与螺型位错,可以促进其表面成核、快速生长。

关键词: 碱式硫酸镁, 纳米线, 水热, 结晶, 动力学, 成核

Abstract:

Using magnesium sulfate and sodium hydroxide as raw materials and potassium hydrogen phthalate as complexing agent, basic magnesium sulfate nanowires were prepared by complexation-hydrothermal method. The crystallization mechanism of magnesium oxysulfate (MOS) nanowire was investigated, and the crystallization kinetic equations were established by analyzing the concentration of Mg via the hydrothermal synthesis process. Then, the surface nucleation mode of the nanowire was confirmed. The results illustrated the crystallization of the nanowire was controlled by multi-core surface growth mode at 140℃ and 160℃. However, it changed to linear surface growth mode at 180℃ and 200℃. The microstructures of MOS nanowires were investigated by transmission electron microscopy. There are many edge dislocations and screw dislocations in the crystals, their effects in MOS nanowires on growth kinetics are to decrease the two-dimensional nucleation barrier and act as a self-perpetuating step sources.

Key words: magnesium oxysulfate, nanowires, hydrothermal, crystallization, kinetics, nucleation

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