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DTSTAMP:20260414T033148
DTSTART:20150909T110000
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DTEND:20150909T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/624063
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Conférence de la Professeure Al-Abadleh  (Wilfrid Laurier)
DESCRIPTION:Titre : Surface Chemistry of Environmentally-Important Organoar
 senice Compounds Studied by ATR-FTIR\, DFT Calculations\, Calorimetry and 
 Surface Complexation Modeling.Endroit : Pavillon Roger-Gaudry\, salle G-81
 5 à 11 h.Hôte : Professeur Patrick Hayes
\nLa conférence sera prononcé
 e (en anglais) par la professeure Hind A. Al-Abadleh\, du Département de 
 chimie et de biochimie de la Wilfrid Laurier University.
\nRésumé : Orga
 noarsenic compounds are found in the environment from the bio-methylation 
 of inorganic arsenic and from anthropogenic sources. They pose health and 
 environmental risks due to their potential cycling to the most toxic forms
  of arsenic. The environmental fate of arsenic compounds depends on their 
 surface interactions with geosorbents. Molecular-level understanding of th
 e binding mechanism at liquid/solid interfaces demands integrating spectro
 scopic\, calorimetric\, computational chemistry and mathematical modeling 
 methods. In this talk\, I will show results on the adsorption/desorption t
 hermodynamic and kinetic behavior of arsenate and methylated arsenicals\, 
 monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) to/from hemati
 te nanoparticles. Experimental results were complemented with DFT calculat
 ions of the geometry and IR frequencies of surface clusters as well as the
  adsorption state functions of ligand exchange reactions. Thermodynamic bi
 nding constants were extracted from applying the triple layer surface comp
 lexation model to adsorption isotherm and pH-envelope data. Rates of adsor
 ption and desorption due to phosphate flow were also determined. The signi
 ficance of these results will be discussed in relation to improving modeli
 ng tools and designing arsenic-removal technologies.
\nInformation supplé
 mentaireAnnonce PDF de la conférence
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