物理化学学报 >> 1990, Vol. 6 >> Issue (03): 323-328.doi: 10.3866/PKU.WHXB19900314

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亚砜类非离子型表面活性剂在固/液界面上的吸附(III)碳黑/水溶液界面上的吸附

朱王步瑶; 赵小麟   

  1. 北京大学物理化学研究所
  • 收稿日期:1989-03-21 修回日期:1989-09-14 发布日期:1990-06-15
  • 通讯作者: 朱王步瑶

Adsorption of Sulfoxides on Solid From Aqueous Solutions III. The Adsorption on Carbon Black

Zhu Bu-Yao; Zhao Xiao-Lin   

  1. Institute of Physical Chemistry, Peking University, Beijing
  • Received:1989-03-21 Revised:1989-09-14 Published:1990-06-15
  • Contact: Zhu Bu-Yao

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摘要： 研究了癸基甲基亚砜在水溶液/炭黑界面上的吸附及温度、加盐(Nacl)、加酸(HCl)对吸附的影响.吸附等温线呈完整的双平台形式. 第一平台吸附量～6 μmol·m~(-2); 第二平台吸附量,即极限吸附量, 为42—48 μmol·m~(-2). 随着吸附增加, 炭黑/水溶液接触角下降, 润湿性, 悬浮性改善.应用两阶段吸附模型和吸附等温线通用公式可以对实验结果作定性和定量的解释. 提供了吸附热力学数据. 指示吸附第二阶段是与体相中表面活性剂胶团化作用相似的熵驱动过程。

Abstract: The adsorption amounts of decylmethylsulfoxide (DEMS) at aqueous solution/carbon black interface and the contact angles of DEMS aqueous solutions on graphite plate have been measured. The influences of temperature, salt (NaCl) and acid(HCl) have been investigated. Typical two plateaux (LS) type adsorption isotherms have been shown. The adsorption ammounts at the first plateau are about 5.7—6.4 μmol·m~(-2) and those at the second one are 42—48 μmol·m~(-2). As the adsorption increasing, the wettability and suspensibility of carbon black in aqueous solution of DEMS were improved obviously. Applying the two-step model of surfactant adsorption on solid/liquid in terface and the general isotherm equation for adsorption of surfactant at solid/liquid in terface (eqn(1))~[5], the experimental results have been interpreted qualitatively and quantitatively.