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Simultaneous Adsorption of Cadmium, Zinc, and Lead on Hydroxyaluminum- and Hydroxyaluminosilicate-Montmorillonite Complexes

^a Faculty of Agriculture, Kochi Univ., B 200 Monobe, Nankoku 783-8502, Kochi, Japan
^b United Graduate School of Agricultural Science, Ehime Univ., Matsuyama 790-8566, Japan

View larger version (31K): [in a new window]   Fig. 1. Metal adsorption patterns as a function of pH in different binary systems with 1 x10-6 M MeI. Experimental conditions: clay/solution ratio, 2.5 g L-1; temperature, 25°C; equlibration time, 24 h.

View larger version (32K): [in a new window]   Fig. 2. The pH-adsorption edges for Cd and Zn in different binary systems with 1 x 10-6 M MeI.

View larger version (36K): [in a new window]   Fig. 3. Metal adsorption patterns as a function of pH in ternary systems with different levels of MeI. Experimental conditions: clay/solution ratio, 2.5 g L-1; temperature, 25°C; equilibration time, 24 h.

View larger version (27K): [in a new window]   Fig. 4. Competitive adsorption of the metals as a function of pH in Cd-Zn-Pb system, 5 x 10-5 M MeI.

View larger version (37K): [in a new window]   Fig. 5. The amounts of total, strongly, and weakly adsorbed (TA, SA, and WA, respectively) metals on the clays as a function of pH in Cd-Pb-Zn system with 5 x 10-5 M MeI.

View larger version (21K): [in a new window]   Fig. 6. Diagram of the ratio of ion activity product (relative to metal hydroxide) [IAPMe(OH)2] to Ksp[Me(OH)2] for the metal adsorption systems. The Ksp[Me(OH)2] represents solubility product constants for the respective metal hydroxides according to Baes and Mesmer (1976).