Adam Mickiewicz University, Faculty of Chemistry, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
Adam Mickiewicz University, Faculty of Chemistry, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
Int J Biol Macromol. 2023 Nov 1;251:126356. doi: 10.1016/j.ijbiomac.2023.126356. Epub 2023 Aug 17.
Pharmaceutical pollutants are a group of emerging contaminants frequently found in water streams. In this study, the composite chitosan beads with incorporated molecularly imprinted polymers (monoliths or microparticles) and iron(III) hydroxide were fabricated to remove ibuprofen from aqueous solutions. The adsorptive properties were investigated in different conditions to evaluate the influence of solution pH, adsorbent dose, ibuprofen initial concentration, adsorption time, and temperature. The highest adsorption capacity (79.41 mg g), about twice as large as that for the chitosan beads without polymers (39.42 mg g), was obtained for the ones containing monoliths imprinted with ibuprofen. The theoretical maximum adsorption capacity of 103.93 mg g was obtained based on the experiments in optimal pH 5. The adsorption of ibuprofen on the hybrid hydrogel beads followed the Freundlich isotherm and pseudo-second-order kinetic models. The process was found as endothermic and thermodynamically spontaneous. The adsorbent with a molecularly imprinted polymer retained its selectivity in the presence of other molecules. The imprinted cavities, chitosan functional groups, and iron hydroxide were presumably responsible for interactions with ibuprofen molecules. Additionally, the effectiveness of the adsorbent did not change significantly in real water samples and remained at a satisfactory level for up to four desorption-adsorption cycles.
药物污染物是经常在水流中发现的一组新兴污染物。在这项研究中，制备了负载分子印迹聚合物（整体或微球）和三价铁（III）氢氧化物的复合壳聚糖珠，以从水溶液中去除布洛芬。在不同条件下研究了吸附性能，以评估溶液 pH 值、吸附剂剂量、布洛芬初始浓度、吸附时间和温度的影响。对于负载有印迹了布洛芬的整体的吸附剂，其吸附容量最高（79.41mg/g），约为没有聚合物的壳聚糖珠（39.42mg/g）的两倍。基于最佳 pH 值 5 下的实验，获得了理论最大吸附容量为 103.93mg/g。布洛芬在混合水凝胶珠上的吸附符合 Freundlich 等温线和拟二级动力学模型。该过程被发现是吸热的，并且是热力学自发的。在存在其他分子的情况下，具有分子印迹聚合物的吸附剂保留了其选择性。印迹空腔、壳聚糖官能团和三价铁（III）氢氧化物可能与布洛芬分子发生相互作用。此外，在实际水样中，吸附剂的有效性没有显著变化，并且在多达四个解吸-吸附循环中仍保持在令人满意的水平。
