Rate of Adsorption of Uranium from Seawater with a Calix[6]arene Adsorbent

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Abstract
The rate of complex formation between calix[6]arene-p-hexasulfonate and uranyl ion is studied over a wide range of carbonate ion concentrations. The presence of carbonate ion decreases the complexation rate. The distribution of various uranyl species is calculated from a set of mass balances of participating ions with their stability constants. UO2(CO3)3 4− has the highest concentration, followed by UO2(OH)3 − and UO2(CO3)2 2−. Other uranyl species are negligible. The complexation rate is proportional to the 0.27–1.0 power of the total concentration of uranyl species other than UO2(CO3)3 4−. This implies that the rate-determining step of the complexation is the reaction between calix[6]arene-p-hexasulfonate and UO2(OH)3 − or UO2(CO3)2 2−.

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