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首页> 外文期刊>RSC Advances >Highly stable and covalently functionalized magnetic nanoparticles by polyethyleneimine for Cr(VI) adsorption in aqueous solution
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Highly stable and covalently functionalized magnetic nanoparticles by polyethyleneimine for Cr(VI) adsorption in aqueous solution

机译：聚乙烯亚胺对水溶液中Cr（VI）吸附的高度稳定和共价官能化的磁性纳米颗粒

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摘要

In the present work, highly stable magnetic nanoparticles covalently functionalized by polyethyleneimine (PEI), denoted as PEI-MNPs, were prepared based on the glutaraldehyde crosslinking reaction between the aldehyde moiety in glutaraldehyde and the amine groups in both PEI and Fe3O4 magnetic nanoparticles (MNPs), and showed strong adsorption affinity to Cr(VI). The successful modification by PEI was confirmed by a series of measurements, such as TEM, XRD, FT-IR, TGA, et al. The time-dependent adsorption experiments indicated that the adsorption of Cr(VI) onto PEI-MNPs finished within 10 min and the adsorption process could be described by the pseudo-second-order kinetics model. The studies on the adsorption of Cr(VI) revealed that the Langmuir adsorption isotherm with the adsorption capacity of 175.76 mg g (1) at 318 K fit the adsorption data. The calculated thermodynamic parameters (Delta G, Delta H, and Delta S) indicated that adsorption of Cr(VI) on PEI-MNPs was spontaneous and exothermic. Furthermore, the stability testing demonstrated that the used adsorbents could be regenerated effectively with 0.5 mol L-1 NaOH solution and no significant loss of adsorption capacity were observed after a run of 20 adsorption-desorption cycles, showing their high stability in extremely acidic and alkaline solution. Most importantly, the obtained PEI-MNPs composite can effectively and selectively absorb Cr(VI) from complex industrial wastewater, indicating that PEI-MNPs could be used as a promising adsorbent for removal of Cr(VI) from real wastewater with high efficiency.
机译：在本工作中，基于戊二醛中的醛基部分与PEI和Fe3O4磁性纳米颗粒（MNPs）中的胺基之间的戊二醛交联反应，制备了由聚乙烯亚胺（PEI）共价官能化的高度稳定的磁性纳米颗粒，称为PEI-MNPs。 ），并显示出对Cr（VI）的强吸附亲和力。通过一系列测量，如TEM，XRD，FT-IR，TGA等，证实了PEI的成功修饰。随时间变化的吸附实验表明，Cr（VI）在PEI-MNPs上的吸附在10 min内完成，吸附过程可以用拟二级动力学模型来描述。 Cr（VI）的吸附研究表明，在318 K下的吸附容量为175.76 mg g（1）的Langmuir吸附等温线符合吸附数据。计算的热力学参数（ΔG，ΔH和ΔS）表明Cr（VI）在PEI-MNP上的吸附是自发的并且是放热的。此外，稳定性测试表明，用0.5 mol L-1 NaOH溶液可以有效地再生用过的吸附剂，经过20次吸附-解吸循环后，未观察到吸附能力的明显下降，表明它们在极端酸性和碱性条件下具有很高的稳定性。解。最重要的是，所获得的PEI-MNPs复合物可以有效地，选择性地从复杂的工业废水中吸收Cr（VI），这表明PEI-MNPs可以用作从实际废水中高效去除Cr（VI）的有前途的吸附剂。

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