Abstract
Experiments on Zn2+ sorption-desorption by Ca-kaolinite using a wide range of Zn2+ concentrations and two acid pH values allowed us to reach the following conclusions: (1) For Zn2+ surface coverages below the kaolinite C.E.C., Zn2+ was sorbed mainly via ion exchange; (2) At Zn2− sorption values above the C.E.C., Zn2+ was sorbed with higher affinity by a mechanism stronger than ion exchange, involving a strong association of Zn ions with silicate solid phases; and (3) Use of C.E.C. values and/or Langmuir's calculated maxima would greatly underestimate Zn2+ sorption capacity by kaolinite, even at acid pH values.
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García-miragaya, J., Dávalos, M. Sorption and desorption of Zn on Ca-Kaolinite. Water Air Soil Pollut 27, 217–224 (1986). https://doi.org/10.1007/BF00649402
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DOI: https://doi.org/10.1007/BF00649402