Abstract
The adsorption at 22° and 5°C of two acetanilide herbicides (Alachlor and Metolachlor) on montmorillonite saturated with HDTMA + cation or coated with Fe(III) oxyhydroxides (modified clays) was studied. The isotherms were of L, S and C type depending on the type of the adsorbent. The calculated values of isosteric adsorption heat (ΔH) and desorption experiments suggest that weak bonds take place. FT-IR analyses showed that both molecules are adsorbed on clays by hydrogen bond between the C-O group and OH groups of Fe(III) oxyhydroxy cation coating the clay. Also on HDTMA-Montmorillonite the C-O group is involved in the adsorption but with lower strenght. Alachlor is only partially decomposed to 2-chloro-2′,6′-diethylacetanilide when the dirty clays complexes are heated at 70°C for 18 h. X-ray analyses showed that both herbicides were unable to penetrate into the inter-layers of the clays.
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.
