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Published on: October 18, 2017
Adsorption of bentazone and imazapyc from water by using functionalized silica: Experimental and computational
Agustín Spaltro1, Sandra Simonetti2, Sergio Laurella3
1CEDECOR (Centro de Estudio de Compuestos Orgánicos), Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), Calle 115 y 47, (1900), La Plata, Argentina; CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Argentina.
Abstract:
In this study, silica and functionalized silica materials (3-aminopropyl and 3-mercapto derivatives) were successfully used for the removal of the pesticides bentazone and imazapyc from aqueous solutions. Adsorbent materials were characterized by BET isotherms and FT-IR spectroscopy (confirming the functionalization), and their equilibrium adsorption capacity was evaluated at different ionic strengths. It is observed that the maximum adsorption capacities decrease in the order 3-aminopropyl-derivative > silica >3-mercaptopropyl derivative. An increase in ionic strength produces an enhancement in the removal of pesticides. All isotherms are Ib-type and follow the Langmuir model, suggesting a monolayer physical adsorption process.
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