Adsorption of bentazone and imazapyc from water by using functionalized silica: experimental and computational analysis

SPALTRO, AGUSTÍN; RUIZ, DANILA; ALLEGRETTI, PATRICIA; LAURELLA, SERGIO; JUAN, ALFREDO; SIMONETTI, SANDRA; COMPAÑY, ANDRES DIAZ

JOURNAL OF CONTAMINANT HYDROLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2019 vol. 227 p. 103542 - 103550

0169-7722

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.