Abstract

The adsorption of Zn on amorphous hydrous ferric oxide (HFO) was monitored using both solution measurements of the non-absorbed Zn and X-ray photoelectron spectroscopy (XPS) measurements of the adsorbed Zn. Solution results suggest that, at low adsorption densities and/or low pH's, the mechanism of Zn adsorption may be similar to the adsorption of Cd, Cu and Pb. However, at higher adsorption densities and higher pH's, there is an apparent change in Zn speciation. Chemical shift and adsorbate thickness values derived from XPS provide information on the mechanism of the surface adsorption of Zn. The XPS studies show that submonolayer coverages of Zn are largely chemically adsorbed at solution pH's less than 6.5, while at higher pH's the Zn is partially hydrolyzed to form a surface layer containing physisorbed Zn(OH)2 which may exceed monolayer thicknesses.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.