College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, China.
J Colloid Interface Sci. 2011 Oct 15;362(2):503-9. doi: 10.1016/j.jcis.2011.06.071. Epub 2011 Jul 8.
The presence of sulfonamide antibiotics in aquatic environments poses potential ecological risks and dangers to human health. In this study, porous resins as adsorbents for the removal of two sulfonamides, sulfadiazine and sulfadimidine, from aqueous solutions were evaluated. Activated carbon F-400 was included as a comparative adsorbent. Despite the different surface properties and pore structures of the three resins, similar patterns of pH-dependent adsorption were observed, implying the importance of sulfonamide molecular forms to the adsorption process on the resins. Sulfonamide adsorption to the three resins exhibited different ionic strengths and temperature dependence consistent with sulfonamide speciation and the corresponding adsorption mechanism. Adsorption of sulfadiazine to F-400 was relatively insensitive to pH and ionic strength as micropore-filling mainly contributed to adsorption. The adsorption mechanism of sulfadiazine to the hypercrosslinked resin MN-200 was similar to that of the macroporous resin XAD-4 at lower pH values, whereas it was almost identical to the aminated resin MN-150 at higher pH. This work provided an understanding of adsorption behavior and mechanism of sulfonamide antibiotics on different adsorbents and should result in more effective applications of porous resin for antibiotics removal from industrial wastewater.
磺胺类抗生素在水环境中的存在对生态环境和人类健康构成了潜在的威胁和风险。本研究评估了多孔树脂作为吸附剂，用于从水溶液中去除两种磺胺类抗生素磺胺嘧啶和磺胺二甲嘧啶。活性炭 F-400 被用作比较吸附剂。尽管三种树脂具有不同的表面性质和孔结构，但观察到了相似的 pH 值依赖性吸附模式，这表明磺胺类分子形态对树脂吸附过程的重要性。磺胺类抗生素在三种树脂上的吸附表现出不同的离子强度和温度依赖性，这与磺胺类物质的形态和相应的吸附机制一致。磺胺嘧啶在 F-400 上的吸附对 pH 和离子强度的变化相对不敏感，因为微孔填充主要导致吸附。磺胺嘧啶在高 pH 值下对超交联树脂 MN-200 的吸附机制与大孔树脂 XAD-4 相似，而在较低 pH 值下则与氨基树脂 MN-150 几乎相同。这项工作提供了对不同吸附剂上磺胺类抗生素吸附行为和机制的理解，应该会导致更有效地利用多孔树脂从工业废水中去除抗生素。
