Retention of Cu2+, Ca2+, Mg2+, and Mn2+ by Amorphous Alumina1
- Murray B. McBride2
The adsorption of Cu2+ at low pH on amorphous alumina gels was studied using electron spin resonance and specific ion electrode techniques. The results, when compared with the inability of alumina to retain Mn2+, Ca2+, and Mg2+, indicated that Cu2+ demonstrated a specific preference for alumina. Both Cu2+ and Mg2+ were found to coprecipitate readily with alumina; however, these ions opened the structure, increasing the noncrystallinity and adsorptive capacity of the alumina. The data indicated that the sites of adsorbed and coprecipitated Cu2+ in alumina were similar, suggesting that adsorption of metals capable of occupying octahedral sites in the structure involves the same mechanism as substitution of the metals into the structure during coprecipitation. In both cases, the Cu2+ ions appeared to be nonexchangeable and immobile as they entered structural positions.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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