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土壤圈(英文版). 1998, (02)

Magnesium （II） Adsorption from Aqueous Solutions on China Clay and the Stability Constants for Complex FormationEnglish Full Text

S. BEGUM and F. U. KHAN Pakistan Council of Scientific and Industrial Research Labs, Peshawar (Pakistan)

Abstract: China clay was employed as an adsorbent for the removal of Mg 2+ 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 H + rel /Mg 2+ ads ratio changed from a fractional value to 2.5. Strong chemical bondings took place between oxygen atom of the surface and Mg 2+ , resulting in a surface complex species. Temperature had a significant effect on H + rel , and the stability constants also increased with increasing temperature.
Keywords：

H + releasing; Mg 2+ adsorption; stability constants; temperature;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S153

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