高等学校化学学报

高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (4): 532.

• 研究简报 • 上一篇    

硫脲和二苯基硫脲在汞电极上的吸附

周作祥, 曹金兰   

  1. 南开大学化学系
  • 收稿日期:1981-09-17 出版日期:1983-08-24 发布日期:1983-08-24

THE ADSORPTION OF THIOUREA AND DIPHENYTHIOUREA ON MERCURY- ELECTROLYTE INTERFACE

Zhou Zhuoxiang, Chao Jinlan   

  1. Department of Chemistry, Nankai University, Tianjin
  • Received:1981-09-17 Online:1983-08-24 Published:1983-08-24

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被引次数

3

摘要： <正> 硫脲在汞电极上吸附行为的研究,近年来仍有报导[1],至于其衍生物在汞电极上的吸附数据,见诸于文献报导的还不多。我们用毛细管静电计[2]测定了硫脲在0.5NH2SO4的水溶液和混合溶剂溶液(0.5NH2SO4水溶液加甲醇,其体积比为23.4:26.6)中及二苯基硫脲在混合溶剂溶液中的电毛细曲线。我们使用的毛细管静电计测出的电毛细曲线的重现性,最高点为±0.16达因·厘米-1。正、负半支分别为±0.32达因·厘米-1。图1和图2列出测得的部分结果。通过对这些数据的分析,揭示了硫脲和二苯基硫脲在汞电极上的吸附行为。我们还测定了尿素在0.5N H2SO4中的电毛细曲线。

Abstract: The a.dsorption of thiourea . (TU) and diphenythiourea (DPTU) on mercury has been investigated by interfacial tension measurements in aqueous solution and aqueous methanol. The maximum potential of electro-capillary curve shifts toward negative as TU or DPTU concentration increases. It is assumed that the negative parts (S atom) of the molecules facing the mercury surface are adsorbed resulting in a linear relation between Δφs=0 and lgC. If the mercury stirface charge density equals to ε, the adsorption isotherm of TU. can be calculated by the follwing equation. Γ=-1.44×10-10lgC + (4.45 + 0.19ε) × 10-10

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