期刊论文详细信息
Journal of the Brazilian Chemical Society | |
Adsorption of thorium(IV) on chemically modified Amazon clays | |
Denis L. Guerra2  Rúbia R. Viana2  Claudio Airoldi1  | |
[1],Universidade Federal de Mato Grosso Centro de Recursos Minerais Cuiabá MT ,Brazil | |
关键词: kaolinite; smectite; thorium; adsorption; thermodynamic; | |
DOI : 10.1590/S0103-50532009000600023 | |
来源: SciELO | |
【 摘 要 】
Kaolinite and smectite clay samples from the Amazon region, Brazil, were modified with 2-mercaptobenzimidazole (MBI) using homogeneous and heterogeneous routes. The modified clay samples (K HOM, S HOM, K HET and S HET) were characterized by textural analysis, SEM and 13C NMR spectroscopy. The chemically modified clay samples showed modifications of their physical-chemical properties including: specific area 48.0 (S) to 869.8 m² g-1 (S HET). The ability of these materials to remove thorium(IV) from aqueous solution was followed by a series of adsorption isotherms adjusted to a Sips equation at room temperature, and pH 2.0. The maximum number of moles adsorbed was determined to be 8.29, 8.86, 9.57 and 9.89 10-1 mmol g-1 for K HOM, K HET, S HOM and S HET, respectively. The energetic effects (ΔintH, ΔintG and ΔintS) caused by thorium(IV) cation adsorption were determined through calorimetry.【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
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