高等学校化学学报

高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (2): 252.

• 论文 • 上一篇    下一篇

电解质和阳离子表面活性剂对MMH/粘土体系胶体性能的影响

孙德军, 侯万国, 韩书华, 宋淑娥, 张春光   

  1. 山东大学胶体与界面化学研究所, 胶体与界面化学开放研究实验室, 济南, 250100
  • 收稿日期:1997-05-19 出版日期:1998-02-24 发布日期:1998-02-24
  • 通讯作者: 孙德军,联系人:男,32岁,硕士,讲师.
  • 作者简介:孙德军,男,32岁,硕士,讲师.
  • 基金资助:

    山东大学跨世纪人才基金和中国石油天然气总公司资助课题.

Effects of Electrolytes and Cationic Surfactant on Colloidal Properties of MMH/Mt System

SUN De-Jun, HOU Wan-Guo, HAN Shu-Hua, SONG Shu-E, ZHANG Chun-Guang   

  1. Institute of Colloid and Interface Chemistry, Key Laboratory for Colloid and Interface Chemistry of State Education Commission, Shandong University, Jinan, 250100
  • Received:1997-05-19 Online:1998-02-24 Published:1998-02-24

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被引次数

19

摘要： 通过流变参数、电泳淌度和pH值的测定,研究了NaCl、MgCl2、Na2SO4等电解质和阳离子表面活性剂(十六烷基三甲基溴化铵)对铝镁混合金属氢氧化物(MMH)/钠土(Mt)悬浮体胶体性能的影响.发现所研究的电解质和表面活性剂都能使MMH/Mt悬浮体的Bingham屈服值降低,但不同处理剂影响pH值和滤失量的变化趋势却不同.认为电解质中的阳离子以影响粘土颗粒间的缔合为主,而阴离子以影响MMH的荷电性能为主,前者使滤失量上升,pH值下降;后者使滤失量下降,pH值上升.电解质对MMH/Mt悬浮体滤失量和pH值的影响取决于二者相对能力的大小.阳离子表面活性剂由于在粘土上吸附后不仅影响颗粒之问的缔合,也能使其润湿性反转,导致MMH/Mt悬浮体的滤失量和Bingham屈服值的变化幅度明显高于无机电解质.

关键词: 铝镁混合金属氢氧化物, 钠土悬浮液, 流变学

Abstract: The effects of electrolytes (NaCl, Na2SO4 and MgCl2) and cationic surfactant (cetyltrimethylammonium bromide) on colloidal properties of mixed metal hydroxide (MMH)/montmorillonite (Mt) suspension were studied through measurements of electrophoretic mobilities, rheology and pH. The results show that all the electrolytes and surfactant studied in this work decreased Bingham yield point (YP) of MMH/Mt system, but exerted different effects on fluid loss (FL) and pHof MMH/Mt system. The results are interpreted as means that the cationic ions of electrolytes mainly displace the charge-balancing ions of Mt particles, such as H+ and Na+, so enhance their aggregation, leading to the decrease of pH and the increase of FL, but the anionic ions of these electrolytes mainly displace the charge-balancing ions of MMH particles, such as OH- and Cl-, so weaken the aggregation effects of MMH on Mt particles, therefore, cause the increase of pH and the decrease of FL. In another word, the overall effects of electrolytes on MMH/Mt system depend on the relative ability of anionic and cationic ions to exert the opposite effects on FL and pH. As for cetyltrimethylammonium bromide (CTAB), the adsorption of CTAB on Mt particles does not only displace H+ and cause the aggregation of Mt particles but also reverses their wetting ability, therefore, CTABdecrease FL and YP of MMH/Mt system to a larger extent than inorganic electrolytes although it can only decrease pH slightly.

Key words: Al-Mg mixed metal hydroxide, Na-montmorillonite, Rheology

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