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Adsorption of thorium cation on modified clays MTTZ derivative by Denis L. Guerra; Rúbia R. Viana; Claudio Airoldi is a Environmental Science article available to read on EtoBox.

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Diquite (D) and bentonite (B) mineral samples from the Amazon region, Brazil, were modified by MTTZ derivative (5-mercapto-1-methyltetrazole) using heterogeneous route. These materials were characterized by textural and elemental analysis, transmission electron microscopy (TEM), power X-ray diffraction and 13 C NMR spectroscopy. The chemically modified clay (D MTTZ and B MTTZ ) samples showed modification of its physical-chemical properties including: specific area 41.4 (B) to 398.5 m 2 g -1 (B MTTZ ) and 25.0 (D) to 178.8 m 2 g -1 (D MTTZ ). The adsorption experiments performed under batch process with Th(IV) concentration, pH and contact time as variables. The ability of these materials to remove thorium from aqueous solution was followed by a series of adsorption isotherms adjusted to a Sips equation at room temperature and pH 2.0, with variable concentration of Th(IV). The maximum number of moles adsorbed was determined to be 10.45 × 10 -2 and 12.76 × 10 -2 mmol g -1 for D MTTZ and B MTTZ , respectively. The energetic effects ( int H • , int G • and int S • ) caused by thorium cation adsorption were determined through calorimetric titrations.

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Author

Denis L. Guerra; Rúbia R. Viana; Claudio Airoldi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)