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As the uptake of cationic drugs, such as tetracycline (TC), was attributed to cation exchange, the stability of adsorbed TC on a Ca-montmorillonite SAz-2 was studied using cationic solutions of different valence charges under different pH conditions. At the initial loading of 356 mg g−1, the amounts of TC desorbed by 0.05 M AlCl3, CaCl2, and NaCl were 133 ± 4, 83 ± 6, and 50 ± 4 mg g−1, respectively,...
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