Adsorption of thorium cation on modified clays MTTZ derivative

作者：Guerra Denis L^*; Viana Rubia R; Airoldi Claudio

来源：Journal of Hazardous Materials, 2009, 168(2-3): 1504-1511.

DOI：10.1016/j.jhazmat.2009.03.034

• Diquite
• Bentonite
• Thorium
• Adsorption
• Thermodynamic

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 x 10(-2) and 12.76 x 10(-2) mmol g(-1) for D(MTTZ) and B(MTTZ), respectively. The energetic effects (Delta(int)H degrees, Delta(int)G degrees and Delta(int)S degrees) caused by thorium cation adsorption were determined through calorimetric titrations.

• 出版日期2009-9-15