Direct measurement of the adsorption kinetics of 2-Mercaptobenzothiazole on a microcrystalline copper surface

作者：Ramirez Cano Jorge A; Veleva Lucien

来源：Revista de Metalurgia, 2016, 52(1): e064.

DOI：10.3989/revmetalm.064

• EQCM
• Free energy of adsorption
• Langmuir isotherm
• 2-MBT

The adsorption on copper of 2-Mercaptobenzothiazole (2-MBT), a heterocyclic compound member of the tiazole family, has been investigated at different concentrations (1x10(-1) to 1x10(-6) M) in water, employing the Electrochemical Quartz Crystal Microbalance (EQCM). The frequency response over time was obtained for each concentration, showing a defined exponential behavior at higher concentrations (1x10(-1), 1x10(-2) and 1x10(-3) M), which was fitted to the Langmuir adsorption isotherm with a good correlation coefficients (R-2=0.91 to 0.98). Surface coverage (theta) was calculated and found to be in the order of 0.50 to 0.01 for 2-MBT high concentrations. The free energy of adsorption was Delta G(ads)=-5.59 kJ mol(-1), corresponding to physisorption process, probably of electrostatic nature of the interaction between 2-MBT and copper surface in aqueous solution.

• 出版日期2016-3