Atrazine and glyphosate are two of the most used pesticides around the world causing serious water contamination. In this study, amine-functionalized Santa Barbara Amorphous-15 silica (SBA-15-NH₂) was synthesized and employed for the aqueous adsorption of atrazine and glyphosate. The adsorbent was mesoporous post-functionalization with lower surface area, pore volume, size, and stability when compared to the SBA-15. The pesticides adsorption rates were high with over 85% of potential adsorption having occurred within the initial 180 min. The equilibria for atrazine and glyphosate adsorption were 60 and 360 min, respectively, and the rate data fit the fractal pseudo-second-order and pseudo-second-order models, respectively. Atrazine adsorption was higher at lower solution pH with reduced adsorption as the pH value increased. There was enhanced atrazine adsorption as temperature increased from 22 to 32 °C, but further temperature rise resulted in lower adsorption compared to that recorded at 22 °C. The processes comprise electrostatic interaction, trapping of atrazine within mesopores, and multi-layer adsorption of atrazine on surface-adsorbed atrazine. The equilibrium data fitted the Langmuir adsorption isotherm model better than the Freundlich. The SBA-15-NH₂ adsorption capacity for atrazine and glyphosate was better than many adsorbents reported in literature, the adsorbent is reusable, and exhibited sustained efficiencies for atrazine that was ≥82% even after 3-cycles, an indication of chemical stability and renewability.

中文翻译：

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在表面功能化 SBA-15 上分离水性农药：草甘膦动力学和莠去津的详细经验见解

阿特拉津和草甘膦是世界上最常用的两种农药，造成严重的水污染。在本研究中，合成了胺官能化的Santa Barbara Amorphous-15 二氧化硅(SBA-15-NH _{2 )，并将其用于莠去津和草甘膦的水溶液吸附。}该吸附剂是介孔后功能化的，与 SBA-15 相比，具有较低的表面积、孔体积、尺寸和稳定性。农药吸附率很高，超过 85% 的潜在吸附发生在最初的 180 分钟内。阿特拉津和草甘膦的吸附平衡分别为 60 分钟和 360 分钟，速率数据分别符合分形伪二阶和伪二阶模型。溶液 pH 值较低时，莠去津的吸附量较高，但随着 pH 值的增加，吸附量降低。随着温度从 22 °C 升高到 32 °C，莠去津吸附增强，但与 22 °C 时记录的结果相比，进一步升高温度导致吸附降低。该过程包括静电相互作用、中孔内莠去津的捕获以及表面吸附莠去津上莠去津的多层吸附。平衡数据对Langmuir 吸附等温线模型的拟合效果优于Freundlich 模型。SBA-15-NH ₂对莠去津和草甘膦的吸附能力优于文献报道的许多吸附剂，该吸附剂可重复使用，并且在3个循环后对莠去津的持续效率≥82%，表明其化学稳定性和可再生性。