Comparison between milk constituents of local goat strain and some imported strains rearing under El-jabel Al-Akhdar conditions

Abstract

Kaolinite clay is considered as a good adsorbent material since it is easily available at low cost and high capacity . Clay samples were taken from Dernah (Libya) and thermally treated in 200 and 500 ºC in addition to room temperature . Equilibrium isotherms have been determined for the adsorption of some heavy metal ions, namely, Cu²⁺, Ni²⁺ and Zn²⁺ from aqueous solutions onto clays treated at different temperatures . The obtained results show that the maximum adsorption capacity for Cu²⁺, Ni²⁺ and Zn²⁺,  were 672, 620 and 589 ppm (for Clay-R), 672, 500 and 459 ppm (for Clay-200) and 427, 401 and 333 ppm (for Clay-500). Also, the untreated sample exposes higher adsorption than other calcined samples . Moreover, the order of the capacity is Cu²⁺> Ni²⁺ > Zn²⁺. The experimental results have been fitted with Langmuir and  Frendlich isotherms . The Langmuir isotherm better fitted the experimental data since the average percent deviations were lower than with Frendlich isotherm .