Artículos de revistas
Determinação dos parâmetros cinéticos e termodinâmicos da adsorção de L-cisteína em ouro por meio da técnica de microbalança a cristal de quartzo
Determination of kinetic and thermodynamic parameters of L-cysteine adsorption onto gold by the qcm technique
Fecha
2012Registro en:
Quím. Nova,v.35,n.7,p.1365-1368,2012
0100-4042
10.1590/S0100-40422012000700015
Autor
Santos, Adriano dos
Silva, Josiel José da
Bueno, Paulo Roberto
Watanabe, Ailton Massaiti
Institución
Resumen
This article discusses the adsorption kinetics of a L-cysteine monolayer onto a gold surface by means of information obtained through the QCM technique. The results indicate that the adsorption process is rapid and follows the Langmuir isotherm, in which adsorption and desorption are considered. From these measurements the following parameter values were obtained: k d = (4.2 ± 0.4) x 10-3 s-1, k a = 75 ± 6 M-1 s-1, Keq=(1.8 ± 0.3) x 10(4) M-1 and ΔGads = - (5.8 ± 0.2) kcal mol-1.