Abstract
The adsorption /desorption behaviour of Cd, Cu, Pb, Zn and Ni on illite, beidellite and montmorillonite was investigated using a multichamber device. This method allows one to study the adsorption/desorption rates and metal transfer reactions simultaneously on a few different solids. Sorption experiments show the highest enrichment of metal ions on smectites, but for Pb ions also on illite. The adsorbed amounts of Pb and Cu ions were very high: 80% and 70% of the total concentration of the metal ions, whereas the Zn, Ni and Cd ions were adsorbed in smaller (40–50%) amounts. A desorption experiment of metals adsorbed on clay minerals shows the following sequence of metal mobility from investigated minerals: Pb > Cd ⪢ Cu > Ni > Zn for beidellite, and Pb > Cd ≌ Cu > Ni > Zn for illite and montmorillonite. The lower metal accumulation on clay minerals after reaction with ferrous sulphate is supposed due to the premature iron hydroxide precipitation in the system, which has caused beside metals sorption their precipitation as well. Data from the sorption/desorption studies provides information regarding the different type of metal surface complexes formed with selected clay minerals and will help to predict the fate of metals in soils and sediments.
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 callDisclaimer: 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.
