Adsorption isotherm reveals 4-MBA behavior in gold nanoparticles, suggesting interactions with carboxylate and thiolate groups.
4-Mercaptobenzoic acid (4-MBA) adsorption behavior was studied through an adsorption isotherm with surface-enhanced Raman scattering as the spectroscopic probe molecule, using chitosan-protected gold nanoparticles (AuNP). As the surface coverage was lower, 4-MBA molecules were reoriented, which led to the carboxylate group interaction with AuNP, besides the thiolate interaction, based on experimental and density-functional theory-based results. The adsorption process was fitted considering Langmuir isotherms, and a Gibbs energy of adsorption of –25 kJ mol–1 was obtained.
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Oliveira et al. (2025) studied this question.
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