Direct measurement of the adsorption kinetics of 2-Mercaptobenzothiazole on a microcrystalline copper surface
DOI:
https://doi.org/10.3989/revmetalm.064Keywords:
EQCM, Free energy of adsorption, Langmuir isotherm, 2-MBTAbstract
The adsorption on copper of 2-Mercaptobenzothiazole (2-MBT), a eterocyclic compound member of the tiazole family, has been investigated at different concentrations (1×10−1 to 1×10−6 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 (1×10−1, 1×10−2 and 1×10−3 M), which was fitted to the Langmuir adsorption isotherm with a good correlation coefficients (R2=0.91 to 0.98). Surface coverage (θ) 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 ΔGads=−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.
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