Table 5 Thermodynamic characteristics of adsorption obtained by PP measurements for st-37 in acidic media in the presence of varying concentration of extract.

From: Investigation of Dracocephalum extract based on bulk and nanometer size as green corrosion inhibitor for mild steel in different corrosive media

Sample

Kads (L/mg)

\({\Delta \mathrm{G}}_{\mathrm{ ads}}^{\mathrm{o}}\)(kJ/mol)

Dracocephalum/H2SO4

0.10

− 28.54

Dracocephalum (nano)/H2SO4

0.36

− 31.71

Dracocephalum /HCl

0.01

− 22.83

Dracocephalum (nano)/HCl

0.16

− 29.70

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