Adsorption of phosphate and nitrate anions on ammonium-functionnalized mesoporous silicas |
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Authors: | Rabih Saad Safia Hamoudi Khaled Belkacemi |
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Affiliation: | (1) Department of Soil Sciences and Agri-Food Engineering, Université Laval, G1K 7P4 Quebec, QC, Canada |
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Abstract: | Surface modified mesostructured silica materials represent potential adsorbents offering an opportunity to remediate several
important water pollutants. In the present work, ammonium-functionnalized MCM-41, MCM-48 and SBA-15 mesoporous silica materials
were synthesized via post-synthesis grafting and co-condensation. Their efficiency to remove nitrate and phosphate anions
in aqueous solutions was investigated. The adsorbent materials showed high adsorption capacities reaching 46.5 mg NO3−/g and 55.9 mg H2PO4−/g under the operating conditions explored. The mesoporous silica materials functionalized via post-synthesis grafting method
exhibited higher performances in terms of percentage pollutant removal and adsorption capacities if compared to their analogs
synthesized according to the co-condensation strategy. |
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Keywords: | Mesoporous silica Surface modification Ammonium functional groups Adsorption Removal Phosphate anions Nitrate anions |
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