Boldine was adsorbed from Me2CHOH and MeCN solns. on plugged hexagonal templated SiO2 at 25 degrees C to det. the adsorption isotherms analyzed then by using the Langmuir, Freundlich, Dubinin-Radushkevich and Dubinin-Astakhov models. To det. the isotherm parameters both linear regression and non-linear fitting anal. were used. The equil. adsorption data were best fitted by the Langmuir equation when the non-linear regression was used.