Adsorption of arsenic(V) into modified lamellar Kenyaite

作者：Guerra Denis Lima^*; Airoldi Claudio; Viana Ruba Ribeiro

来源：Journal of Hazardous Materials, 2009, 163(2-3): 1391-1396.

DOI：10.1016/j.jhazmat.2008.06.095

• Kenyaite
• Intercalation reaction
• Arsenic
• Thermodynamic properties

The synthetic Kenyaite sample was used for organofunctionalization process with N-propyldiethylenetrimethoxysilane and bis[3-(triethoxysilyl)propyl]tetrasulfide. The resulted materials were submitted to process of adsorption with arsenic solution at pH 2.0 and 298 /- 1 K. The adsorption isotherms were adjusted using a modified Langmuir equation with regression non-linear; the net thermal effects obtained from calorimetric titration measurements were adjusted to a modified Langmuir equation. The adsorption process was exothermic (Delta(int)H = -4.08 to -5.94 kJ mol(-1)) accompanied by increase in entropy (Delta(int)S = 41.29-62.09 J K(-1) mol(-1))and Gibbs energy (Delta(int)G = -22.33 to -24.45 kJ mol(-1)). The energetic effect caused by metal cation adsorption was determined through calorimetric titration at the solid-liquid interface and gave a net thermal effect that enabled the calculation of the exothermic Values and the equilibrium constant.

• 出版日期2009-4-30