Department of Applied Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran.
Department of Applied Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran.
Int J Biol Macromol. 2017 Aug;101:40-50. doi: 10.1016/j.ijbiomac.2017.03.074. Epub 2017 Mar 18.
The aim of this study was to develop a chitosan-based magnetic adsorbent for selective and effective removal of phosphate from aqueous solutions. For this purpose, Cu-chitosan/FeO nanocomposite was prepared using a facile method and characterized. The prepared adsorbent exhibited more porous surface with higher specific area compared to neat chitosan based on SEM and BET studies. The FTIR and EDX studies indicated the presence of Cu(II) bonded to the adsorbent surface. Crystalline properties of the adsorbent were also studied using XRD. Experimental isotherm data were fitted to nonlinear forms of Langmuir and Freunlich models. The maximum capacity for the modified adsorbent was calculated to be 88mg PO/g, much higher than that for neat chitosan and chitosan/FeO according to the Langmuir isotherm. The adsorption by the modified adsorbent had fast kinetics and obeyed pseudo-second-order kinetic model. Interestingly, the maximum removal efficiency for the modified adsorbent was observed in neutral pH values, pHs of natural waters. A high selectivity against natural waters common anions as well as good regeneration ability was obtained for the introduced adsorbent.
本研究旨在开发一种基于壳聚糖的磁性吸附剂，用于从水溶液中选择性和有效地去除磷酸盐。为此，采用简便的方法制备了 Cu-壳聚糖/FeO 纳米复合材料，并对其进行了表征。与纯壳聚糖相比，SEM 和 BET 研究表明，所制备的吸附剂具有更多孔的表面和更高的比表面积。FTIR 和 EDX 研究表明，Cu(II) 键合到吸附剂表面。还使用 XRD 研究了吸附剂的结晶性质。实验等温线数据拟合到 Langmuir 和 Freundlich 模型的非线性形式。根据 Langmuir 等温线，改性吸附剂的最大容量计算为 88mg PO/g，远高于纯壳聚糖和壳聚糖/FeO。改性吸附剂的吸附具有快速的动力学，符合拟二级动力学模型。有趣的是，在中性 pH 值（天然水的 pH 值）下观察到改性吸附剂的最大去除效率。该引入的吸附剂对天然水中常见的阴离子具有高选择性和良好的再生能力。
