Abo Markeb Ahmad, Alonso Amanda, Dorado Antonio David, Sánchez Antoni, Font Xavier
a Department of Chemical, Biological and Environmental Engineering , Escola d'Enginyeria, Universitat Autònoma de Barcelona , Bellaterra , Spain.
b Department of Mining Engineering and Natural Resources , Universitat Politècnica de Catalunya , Barcelona , Spain.
Environ Technol. 2016 Aug;37(16):2099-112. doi: 10.1080/09593330.2016.1141999. Epub 2016 Feb 19.
A novel nanocomposite (NC) based on magnetite nanoparticles (Fe3O4-NPs) immobilized on the surface of a cationic exchange polymer, C100, using a modification of the co-precipitation method was developed to obtain magnetic NCs for phosphate removal and recovery from water. High-resolution transmission electron microscopy-energy-dispersive spectroscopy, scanning electron microscopy , X-ray diffraction, and inductively coupled plasma optical emission spectrometry were used to characterize the NCs. Continuous adsorption process by the so-called breakthrough curves was used to determine the adsorption capacity of the Fe3O4-based NC. The adsorption capacity conditions were studied under different conditions (pH, phosphate concentration, and concentration of nanoparticles). The optimum concentration of iron in the NC for phosphate removal was 23.59 mgFe/gNC. The sorption isotherms of this material were performed at pH 5 and 7. Taking into account the real application of this novel material in real water, the experiments were performed at pH 7, achieving an adsorption capacity higher than 4.9 mgPO4-P/gNC. Moreover, Freundlich, Langmuir, and a combination of them fit the experimental data and were used for interpreting the influence of pH on the sorption and the adsorption mechanism for this novel material. Furthermore, regeneration and reusability of the NC were tested, obtaining 97.5% recovery of phosphate for the first cycle, and at least seven cycles of adsorption-desorption were carried out with more than 40% of recovery. Thus, this work described a novel magnetic nanoadsorbent with properties for phosphate recovery in wastewater.
通过改进共沉淀法，开发了一种基于固定在阳离子交换聚合物C100表面的磁铁矿纳米颗粒（Fe3O4-NPs）的新型纳米复合材料（NC），以获得用于从水中去除和回收磷酸盐的磁性NC。使用高分辨率透射电子显微镜-能量色散光谱、扫描电子显微镜、X射线衍射和电感耦合等离子体发射光谱对NC进行表征。采用所谓的穿透曲线连续吸附过程来测定基于Fe3O4的NC的吸附容量。在不同条件（pH值、磷酸盐浓度和纳米颗粒浓度）下研究了吸附容量条件。用于去除磷酸盐的NC中铁的最佳浓度为23.59 mgFe/gNC。该材料的吸附等温线在pH值为5和7时进行。考虑到这种新型材料在实际水中的实际应用，在pH值为7时进行实验，吸附容量高于4.9 mgPO4-P/gNC。此外，Freundlich、Langmuir及其组合符合实验数据，并用于解释pH值对吸附的影响以及这种新型材料的吸附机理。此外，还测试了NC的再生和可重复使用性，第一个循环中磷酸盐的回收率为97.5%，并且进行了至少七个吸附-解吸循环，回收率超过40%。因此，这项工作描述了一种具有从废水中回收磷酸盐特性的新型磁性纳米吸附剂。
