物理化学学报 >> 2001, Vol. 17 >> Issue (11): 1031-1035.doi: 10.3866/PKU.WHXB20011114

研究简报 上一篇    下一篇

两种不同类型的声场与声化学产额的关系

刘岩   

  1. 青海大学化工学院,西宁 810016
  • 收稿日期:2001-04-09 修回日期:2001-07-09 发布日期:2001-11-15
  • 通讯作者: 刘岩 E-mail:liuyanqh@263.net

Sonochemical Reaction in Pulsed Ultrasonic Field and Continuous Ultrasonic Field

Liu Yan   

  1. School of Chemical Engineering,Qinghai University,Xining 810016
  • Received:2001-04-09 Revised:2001-07-09 Published:2001-11-15
  • Contact: Liu Yan E-mail:liuyanqh@263.net

摘要: 采用声源频率为1.8 MHz的连续声波在声强0~5 W•cm-2间,研究了连续混响声场中声化学产领(以溶液的电导率改变、溶液pH值改变和KI溶液的I2析出量以及空化水中的水合负电子()表征)与声强和超声辐照时间之间的关系.理论推论与实验结果均表明,连续声场中声化学产额与声强、超声辐照时间之间呈线性关系.并证明了声场中声化学反应动力学方程具有简单线性关系,与Henglein等人对脉冲声场中声化学产额与声场参数之间呈非线性关系的研究结果比较,证明对实际工业化运行的声化学反应器,采用连续声波更利于目标反应生成物的控制。

关键词: 连续声波, 空化效应, 空化泡, 声化学产额, 声化学反应动力学方程

Abstract: Ultrasound of frequencey 1.8 MHz,sound intensity 1~5 W•cm-2 were used to induce sonochemical reaction in near field acoustical sonochemical reactor.It was found that the sonochemical yield (expressed by the electro-conductance,the pH value,I2 releasing from KI solution and generation in cavitation water) have linear relation with sound intensity and irradiation time.These results were compared with the sonochemical yield in pulsed ultrasonic field.The cavitational bubble′s amount in cavitational sound field is also presented.

Key words: Ultrasound, Cavitation, Cavitation bubble, Sonochemical yield, Reaction dynamic equation