Adsorption on Quartz of Co(II), Ni(II), and Cu(II) in the Form of Hydroxide Nanoparticles or Metal Ionic Species from Solutions with pH Close to That of the Onset of Hydroxide Formation

摘要

The kinetics of adsorption and desorption of Co(II), Ni(II), and Cu(II) from aqueous solutions were studied at such pH values when the prevailing metal species in the continuous phase is either hydroxide of Me~(2+) (at pH only slightly lower than that at which the hydroxide starts to precipitate). The desorption was performed by methods producing different effects on the adsorbed layer. The time of the preceding adsorption was also varied. a significant different effects on the adsorbed layer. The time of the preceding adsorption was also varied. a significant difference in the adsorption-desorption behavior of the metals was revealed. This difference cannot be explained without considering the effects related to the detailed electronic structure of metal species and of the adsorbent active centers. The observed trends are attributed to the difference in the properties of the metals as electron pair acceptors and of the surface coordination compounds formed.