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.

在这项研究中，二氧化硅和功能化的二氧化硅材料（3-氨基丙基和3-巯基衍生物）已成功用于从水溶液中去除农药苯达松和吡虫啉。吸附材料通过BET等温线和FT-IR光谱进行了表征（确认功能化），并在不同离子强度下评估了其平衡吸附容量。观察到最大吸附能力以3-氨基丙基衍生物>二氧化硅> 3-巯基丙基衍生物的顺序降低。离子强度的增加会提高农药的去除率。所有等温线均为Ib型，并遵循Langmuir模型，表明存在单层物理吸附过程。