Pedosphere 8(2): 169--174, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Magnesium (Ⅱ) adsorption from aqueous solutions on China Clay and the stability constants for complex formation
S. BEGUM and F. U. KHAN
Pakistan Council of Scientific, Industrial Research Labs, Peshawar (Pakistan)
ABSTRACT
      China clay was employed as an adsorbent for the removal of Mg2+ from water at pH 7.0 within the temperature range of 303~328 K. The linearity of the plots indicated Langmuir-type isotherms. The reaction was exothermic. A maximum removal of 35% was obtained at 0.50 mmol L-1 metal concentration and a pH of 7.0 at 303 K. The Hrel+/Mgads2+ ratio changed from a fractional value to 2.5. Strong chemical bondings took place between oxygen atom of the surface and Mg2+, resulting in a surface com plex species. Tem perature had a significant effect on Hrel+, and the stability constants also increased with increasing temperature.
Key Words:  Hrel+ easing, Mg2+ adsorption, stability constants, temperature
Citation: Begum, S. and Khan, F. U. 1998. Magnesium (Ⅱ) adsorption from aqueous solutions on China Clay and the stability constants for complex formation. Pedosphere. 8(2): 169-174.
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