Abstract
We studied the pH and temperature effects on copper ions adsorption on green and red clays from Tejera-Esghira in Medenine, Tunisia. Acid-activation was studied to improve the adsorption capacity. X-Ray Diffraction identified kaolinite and illite as major clay minerals. At 20 °C, pH5.5 and before acid-activation, the amount adsorbed by the green and red clays was 28.3 and 13.2 mg . g − 1 respectively and increased to 40.6 and 26.8 mg . g − 1 after acid-activation, and the adsorption isotherms could be described by the Langmuir model. Thermodynamic parameters showed that the adsorption process was spontaneous and exothermic. In comparison silica gel adsorbed 27.15 mg . g − 1 copper ions.
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