广西师范大学学报（自然科学版） ›› 2018, Vol. 36 ›› Issue (2): 78-86.doi: 10.16088/j.issn.1001-6600.2018.02.011

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羧酸盐型Gemini表面活性剂的表面性能研究

吴娟,邹华*,梅平   

  1. 长江大学化学与环境工程学院,湖北荆州 434023
  • 收稿日期:2017-07-04 出版日期:2018-05-10 发布日期:2018-07-18
  • 通讯作者: 邹华(1977—),女,湖北荆州人,长江大学讲师。E-mail:70401773@qq.com
  • 基金资助:
    国家自然科学基金(21403017);中国石油科技创新基金(2011D-5006-0211)

Surface Properties of Carboxylate Gemini Surfactant

WU Juan,ZOU Hua*,MEI Ping   

  1. College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou Hubei 434023,China
  • Received:2017-07-04 Online:2018-05-10 Published:2018-07-18

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摘要： 采用铂金板法测定羧酸盐型Gemini表面活性剂(CGS-12)的表面张力曲线,考察了溶液pH、无机盐以及醇的加入对CGS-12表面性能的影响规律,采用滴体积法测定CGS-12 的动态表面张力曲线,并探讨其动态吸附机理。结果表明,CGS-12的临界胶束浓度(cmc)和临界表面张力(γcmc)分别为80 μmol/L和26.37 mN/m;当溶液pH值为6时,CGS-12的表面张力值最低,且其表面张力随溶液pH的变化具有可逆性;CGS-12的表面张力随NaCl浓度的增大先减小后增大,CGS-12的表面张力随着CaCl2浓度的增大先增大后基本不变;CGS-12的表面活性随着正丁醇浓度的增大而增加,随着醇碳链长度的增加,cmc的变化并不明显,但γcmc却明显降低;动态表面张力结果表明,CGS-12浓度较低时,吸附初期为扩散控制,吸附后期为混合动力学控制,浓度较高时,吸附初期曲线难以模拟,吸附后期为混合动力学控制。

关键词: 羧酸盐型Gemini表面活性剂, 表面活性, 表面张力, 抗盐性能, 动态吸附

Abstract: The surface tension curve of carboxylate Gemini surfactant (CGS-12) was measured using the platinum plate method. The effects of pH value, the addition of inorganic salts and alcohols on the surface properties of CGS-12 were investigated. In addition,the dynamic surface tension curve of CGS-12 was measured using drop volume method,and the dynamic adsorption mechanism was also explored. The results show that the cmc and γcmc of CGS-12 are 80 μmol/L and 26.37 mN/m, respectively. The adjustment of pH value of solution leads to a reversible change of the surface tension of CGS-12 which reaches the minimal at the pH value of 6. Increasing the concentration of NaCl, the surface tension of CGS-12 decreases first and then increases. However, the surface tension of CGS-12 undergoes an increase before reaching a plateau as the concentration of CaCl2 is increased. The surface activity of CGS-12 increases with the increasing concentration of n-butanol. Increasing the carbon chain lengths of the alcohol, γcmc decreases significantly with no obvious variation for cmc. The results of the dynamic surface tension show that the adsorption at low concentration of CGS-12 is controlled by diffusion at the beginning and then a mixed kinetic-diffusion adsorption mechanism toward the end. At higher concentration of CGS-12, the adsorption process is controlled by the mixed kinetic-diffusion adsorption mechanism for the later stage although it can’t be simulated at the initial stage.

Key words: carboxylate Gemini surfactant, surface activity, surface tension, salt resistance, dynamic adsorption

中图分类号: 

  • TQ423
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