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刘志, 邱立平, 王嘉斌, 张守彬, 谢康. 超声对磷酸铵镁结晶特性的影响[J]. 环境工程学报, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
引用本文: 刘志, 邱立平, 王嘉斌, 张守彬, 谢康. 超声对磷酸铵镁结晶特性的影响[J]. 环境工程学报, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
shu
Liu Zhi, Qiu Liping, Wang Jiabin, Zhang Shoubin, Xie Kang. Effect of ultrasound on crystallization characteristics of magnesium ammonium phosphate (MAP)[J]. Chinese Journal of Environmental Engineering, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
Citation: Liu Zhi, Qiu Liping, Wang Jiabin, Zhang Shoubin, Xie Kang. Effect of ultrasound on crystallization characteristics of magnesium ammonium phosphate (MAP)[J]. Chinese Journal of Environmental Engineering, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
shu

超声对磷酸铵镁结晶特性的影响

  • 1.

    济南大学土木建筑学院, 济南 250022

  • 2.

    北京工业大学建筑工程学院, 北京 100022

  • 基金项目:

    国家自然科学基金资助项目(51278225)

    山东省科技发展项目(2013GSF11704)

    济南市科技发展计划项目(201302079)

  • 中图分类号: X703

Effect of ultrasound on crystallization characteristics of magnesium ammonium phosphate (MAP)

  • 1.

    School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China

  • 2.

    College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China

  • Fund Project:

  • 摘要: 利用自制实验装置考察了功率超声对磷酸铵镁(MAP)溶液的结晶介稳区、诱导期、结晶反应速率和晶型等结晶反应特性的影响作用规律。结果表明,对于浓度为4 mmol/L的MAP溶液,分别施加150、250和350 W的功率超声,其达到超饱和状态的临界pH值分别比自然反应条件的临界pH值降低0.14、0.21和0.38,结晶介稳区也随超声功率的增加逐渐变窄;施加150~200 W的功率超声,可将MAP的结晶诱导期从340 s缩短至50~100 s以下,但是继续提高超声功率,结晶诱导期变化不大;超声作用下的MAP结晶反应速率明显加快,随着超声功率的增加,结晶反应速率曲线的缓慢平台期几近消失;扫描电镜观测结果表明,超声作用下MAP结晶产物更加均匀,晶体形貌完整,晶体增长较快。
    Abstract: A specialized experimental device was utilized to investigate the influence of ultrasound on the crystallization characteristics of magnesium ammonium phosphate (MAP); the crystallization metastable zone width, induction period, reaction rate, and the crystal shape of MAP were analyzed in detail. The results showed that the critical pH value of the supersaturated MAP solution would decrease by 0.14, 0.21, and 0.38 with ultrasonication of 4 mmol/L MAP reaction solutions at 150, 250, and 350 W, respectively. Moreover, the metastable zone width gradually narrowed with increasing ultrasonic power, and the induction period of MAP solutions could be shortened from 340 s to the range from 50 to 100 s while increasing the ultrasound power to the range from 150 to 200 W. However, there was a slight change in the induction period as the increase in ultrasonic power continued. It was also observed that the crystallization reaction rate of MAP could be accelerated significantly by ultrasonication, and the plateaus of the MAP crystallization reaction rate curve nearly vanished as the ultrasonic power increased. Furthermore, more uniform, more complete, and fast growth of the produced MAP crystal as the ultrasound power increased was observed from scanning electron microscopy (SEM) images.
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  • 收稿日期:  2015-01-03
  • 刊出日期:  2016-03-18
刘志, 邱立平, 王嘉斌, 张守彬, 谢康. 超声对磷酸铵镁结晶特性的影响[J]. 环境工程学报, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
引用本文: 刘志, 邱立平, 王嘉斌, 张守彬, 谢康. 超声对磷酸铵镁结晶特性的影响[J]. 环境工程学报, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
shu
Liu Zhi, Qiu Liping, Wang Jiabin, Zhang Shoubin, Xie Kang. Effect of ultrasound on crystallization characteristics of magnesium ammonium phosphate (MAP)[J]. Chinese Journal of Environmental Engineering, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
Citation: Liu Zhi, Qiu Liping, Wang Jiabin, Zhang Shoubin, Xie Kang. Effect of ultrasound on crystallization characteristics of magnesium ammonium phosphate (MAP)[J]. Chinese Journal of Environmental Engineering, 2016, 10(3): 1097-1102. doi: 10.12030/j.cjee.20160315
shu

超声对磷酸铵镁结晶特性的影响

  • 1.  济南大学土木建筑学院, 济南 250022
  • 2.  北京工业大学建筑工程学院, 北京 100022
  • 收稿日期:  2015-01-03
基金项目:

国家自然科学基金资助项目(51278225)

山东省科技发展项目(2013GSF11704)

济南市科技发展计划项目(201302079)

摘要: 利用自制实验装置考察了功率超声对磷酸铵镁(MAP)溶液的结晶介稳区、诱导期、结晶反应速率和晶型等结晶反应特性的影响作用规律。结果表明,对于浓度为4 mmol/L的MAP溶液,分别施加150、250和350 W的功率超声,其达到超饱和状态的临界pH值分别比自然反应条件的临界pH值降低0.14、0.21和0.38,结晶介稳区也随超声功率的增加逐渐变窄;施加150~200 W的功率超声,可将MAP的结晶诱导期从340 s缩短至50~100 s以下,但是继续提高超声功率,结晶诱导期变化不大;超声作用下的MAP结晶反应速率明显加快,随着超声功率的增加,结晶反应速率曲线的缓慢平台期几近消失;扫描电镜观测结果表明,超声作用下MAP结晶产物更加均匀,晶体形貌完整,晶体增长较快。

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