Role of activated carbon on micropollutans degradation by ionizing radiation |
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| Affiliation: | 1. Mathematisches Institut, Universität Jena, Ernst-Abbe-Platz 2, 07743 Jena, Germany;2. Department of Computer Science, Columbia University, New York, NY 10027, USA;3. Institute of Applied Mathematics, University of Warsaw, ul. Banacha 2, 02-097 Warszawa, Poland;1. Department of Financial Engineering, University of the Aegean, Chios 821 32, Greece;2. Department of Mechanics, National Technical University of Athens, Laboratory of Testing and Materials, 157 73 Zografou Campus, Greece;3. Materials and Membranes for Environmental Separations Laboratory, Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi 153 41, Attica, Greece;1. Département de santé environnementale et santé au travail, École de santé publique de l’Université de Montréal, C.P. 6128, succ. Centre-ville, Montréal (Québec) H3C 3J7, Canada;2. Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST), Montréal (Québec) H3A 3C2, Canada;3. Institut de recherche sur l’hydrogène de l’Université du Québec à Trois-Rivières, C.P.500, Trois-Rivières, QC G9A 5H7, Canada |
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| Abstract: | The objective of this study was to analyze the influence of the presence of activated carbon on the degradation of the triiodinated contrast medium diatrizoate (DTZ) by the simultaneous use of gamma radiation and activated carbon. Four commercial activated carbons (Ceca, Witco, Sorbo, and Merck) with different textural and chemical characteristics were used for this purpose. The percentage DTZ removal obtained was considerably higher with the gamma radiation/activated carbon (GM/AC) system than with radiolysis in the absence of activated carbon, and it depended on the specific activated carbon employed. First, we optimized the amount of activated carbon required to maximize the amount of DTZ removed by the GM/AC system (0.06 g). The degradation constants were higher with the GM/AC system than with radiolysis alone, evidencing a synergic effect that favors pollutant removal. This synergic effect is independent of the textural but not the chemical characteristics of the activated carbon, observing a higher synergic activity for carbons with a higher surface content of oxygen, specifically quinone groups. We also highlight that the synergic effect of the activated carbon requires adsorbent–adsorbate electrostatic interaction and is absent when this interaction is hindered. |
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| Keywords: | ACs" },{" #name" :" keyword" ," $" :{" id" :" k0010" }," $$" :[{" #name" :" text" ," _" :" activated carbons AOPs" },{" #name" :" keyword" ," $" :{" id" :" k0020" }," $$" :[{" #name" :" text" ," _" :" advanced oxidation processes AORPs" },{" #name" :" keyword" ," $" :{" id" :" k0030" }," $$" :[{" #name" :" text" ," _" :" advanced oxidation/reduction processes BE" },{" #name" :" keyword" ," $" :{" id" :" k0040" }," $$" :[{" #name" :" text" ," _" :" XPS binding energy D" },{" #name" :" keyword" ," $" :{" id" :" k0050" }," $$" :[{" #name" :" text" ," _" :" absorbed dose DTZ" },{" #name" :" keyword" ," $" :{" id" :" k0060" }," $$" :[{" #name" :" text" ," _" :" sodium diatrizoate mean pore width C" },{" #name" :" keyword" ," $" :{" id" :" k0080" }," $$" :[{" #name" :" text" ," _" :" ceca AC-40 activated carbon GM/CA" },{" #name" :" keyword" ," $" :{" id" :" k0090" }," $$" :[{" #name" :" text" ," _" :" gamma radiation/activated carbon system HPLC" },{" #name" :" keyword" ," $" :{" id" :" k0100" }," $$" :[{" #name" :" text" ," _" :" high performance liquid chromatography M" },{" #name" :" keyword" ," $" :{" id" :" k0110" }," $$" :[{" #name" :" text" ," _" :" Merck activated carbon pH of point of zero charge S" },{" #name" :" keyword" ," $" :{" id" :" k0130" }," $$" :[{" #name" :" text" ," _" :" Sorbo-Norit activated carbon surface area determinate by BET external surface determined by the t method total pore volume W" },{" #name" :" keyword" ," $" :{" id" :" k0170" }," $$" :[{" #name" :" text" ," _" :" Witco activated carbon XPS" },{" #name" :" keyword" ," $" :{" id" :" k0180" }," $$" :[{" #name" :" text" ," _" :" X-ray photoelectron spectroscopy |
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