Preparation of polyaminated Fe3O4@chitosan core-shell magnetic nanoparticles for efficient adsorption of phosphate in aqueous solutions
Preparation of polyaminated Fe3O4@chitosan core-shell magnetic nanoparticles for efficient adsorption of phosphate in aqueous solutions
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DOI：
10.1016/j.jiec.2019.11.033
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发表时间：
2020-03-25
影响因子：
6.1
通讯作者：
Juang, Ruey-Shin
中科院分区：
文献类型：
--
作者：
Fu, Chun-Chieh;Hai Nguyen Tran;Juang, Ruey-Shin
本研究合成了一种新型的聚乙烯亚胺(PEI)接枝壳聚糖(CS)核壳结构磁性纳米粒子(Fe3O4/CS/PEI)，并将其用于吸附水中的磷酸盐。利用超导量子干涉仪、X射线衍射仪、X射线光电子能谱仪、傅立叶变换红外光谱仪、透射电子显微镜、Zeta电位仪和氮气吸附仪等分析手段，首次对所合成的纳米粒子的磁性和物理化学性质进行了分析。随后的实验表明，吸附磷酸盐的量随着平衡pH的升高而增加，在接近4.0的范围内，随着pH的进一步升高，吸附的磷酸盐的量逐渐减少。Fe3O4/CS/PEI颗粒对磷酸盐的吸附等温线符合Langmuir方程，当平衡pH值为3.0和25℃时，其最大吸附量为48.2 mg g(-1)，吸附机理主要为静电吸引。研究了氯离子、硝酸盐、碳酸盐和硫酸盐等过量阴离子对磷酸盐的优先吸附作用。在所研究的条件下，用0.05mol L-1的氢氧化钠溶液从负载的Fe3O4/CS/PEI颗粒中解吸90%以上的磷酸盐。五次循环重复使用测试表明，Fe3O4/CS/PEI粒子具有良好的应用前景。(C)2019年韩国工业和工程化学学会。爱思唯尔出版，版权所有。
In this study, novel polyethylenimine (PEI)-grafted chitosan (CS) core-shell (called as Fe3O4/CS/PEI) magnetic nanoparticles were synthesized and applied for adsorbing phosphate in water. The magnetic and physicochemical properties of as-synthesized nanoparticles were first analyzed by means of a superconducting quantum interference device, X-ray diffractometer, X-ray photoelectron spectroscope, Fourier-transform infrared spectroscope, transmission electron microscope, zeta potential analyzer, and nitrogen sorptiometer. The followed experiments indicated that the amount of phosphate adsorbed increased with increasing equilibrium pH to near 4.0 and then decreased when the pH was further increased. The adsorption isotherms of phosphate on Fe3O4/CS/PEI particles were well fit by the Langmuir equation, and its maximum adsorption was 48.2 mg g(-1) at an equilibrium pH of 3.0 and 25 degrees C. The primary mechanism for phosphate adsorption on Fe3O4/CS/PEI particles was electrostatic attraction. The preferential adsorption of phosphate in the presence of other excess anions including chloride, nitrate, carbonate, and sulfate was presented. Under the conditions studied, more than 90% of phosphate was desorbed from the laden Fe3O4/CS/PEI particles by 0.05 mol L-1 of NaOH solution. The remained adsorption efficiency obtained in the five-cycle reusability tests has demonstrated the promising application potential of Fe3O4/CS/PEI particles. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.