From the UV-Vis spectroscopy, the adsorption ability of cobalt complexes follows XXX > XXX > XXX. The adsorption of XXX is higher than other complexes because it pores high charge density. Therefore, it could interact on negative charge on the silica surface, as compared to other complexes. Considering charge density of all complexes, it could follows XXX > XXX > XXXl > XXX. Hence, the adsorption ability of cobalt complexes on silica surface depends onthe charge density.
Due to the shifts of λmax of the remaining solution, loading of Co-Pc cannot be analyzed by using UV-Vis spectroscopy. In order to find the Cobalt adsorbed on silica.