CRCU

Chemical Research in Chinese Universities ›› 1999, Vol. 15 ›› Issue (1): 58-62.

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Studies on ζ-Potential of Positive Sol of Magnesium Aluminum Hydroxide

HAN Shu-hua, HOU Wan-guo, DONG Qian, SUN De-jun, HUANG Xi-rong, ZHANG Chun-guang   

  1. Key Laboratory for Colloid, Interface Chemistry of State Education Commission, Institute of Colloid, Interface Chemistry, Shandong University, Jinan, 250100
  • Received:1998-02-25 Online:1999-01-24 Published:2011-08-17
  • Supported by:

    Supported by the National Natural Science Foundation of Shangdong Province and the Youth Science Foundation of Shandong University .

PDF (PC)

Abstract: The IEP of magnesium aluminum hydroxide was predicted with the modified Yoon's equation, and the effect of electrolyte on the ζ-potential of the sol was studied by electrophoresis method. The results showed that the calculated IEP values with the modified Yoon's equation agreed well with the experimental ones. With the increase of the ionic radius of monovalent anions (Cl-, Br-, I-) the ζ-potential decreased. The same was true for CO32-, SO42- but the sign of the ζ-potential reversed from positive to negative. For Al3+, Ca2+, Mg2+, however, the ζ-potential increased with the increase of the concentration of Al3+, Ca2+, Mg2+.

Key words: ζ-Potential, Isoelectric point, Magnesium aluminum hydroxide, Prediction