Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Selective Selenate Adsorption on Cationated Amino-Functionalized MCM-41
Toshiyuki YokoiTakashi TatsumiHideaki Yoshitake
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2003 Volume 76 Issue 11 Pages 2225-2232

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Abstract

A large distribution coefficient and large sorption capacity were observed during selenate adsorption by cation (Fe3+, Cu2+, and H+)-anchored diamino-functionalized MCM-41. Moreover, these synthetic adsorption media showed excellent selectivity for selenate sorption in the presence of other anions. In a pure potassium selenate solution, the distribution coefficients, Kd, exceeded 200000 when [selenate] < 25 mg in 1 g of these adsorbents (i.e., when the coverage of selenate < 0.4). The adsorption capacities of these three adsorption media were 117, 83.0, and 123 mg (g-adsorbent)−1, respectively, with the Fe and Cu centers having the capacity to bind 1.5 and 1.1 selenate anions on average. Tests on mono- (N-), di- (NN-), and triamino- (NNN-) functionalized MCM-41 showed that the diamino-functionalized varieties exhibited the largest value for Kd when cationated by Fe3+ and Cu2+. In the case of Fe/NN-MCM-41, diamino-functionalized MCM-41 cationated by Fe3+, the degree of inhibition caused by coexisting SO42− was much lower than the value reported for aluminum oxide. Cu/NN-MCM-41 showed the largest resistance to inhibition by Cl. For the adsorbents that we tested, the effects of coexisting nitrate were smallest for these three anions. The local structure of the adsorption center in Fe/NN-MCM-41 was analyzed by EXAFS spectroscopy.

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© 2003 The Chemical Society of Japan
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