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外文期刊>Journal of Environmental Health Science and Engineering
>One-Pot synthesis, characterization and adsorption studies of amine-functionalized magnetite nanoparticles for removal of Cr (VI) and Ni (II) ions from aqueous solution: kinetic, isotherm and thermodynamic studies
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One-Pot synthesis, characterization and adsorption studies of amine-functionalized magnetite nanoparticles for removal of Cr (VI) and Ni (II) ions from aqueous solution: kinetic, isotherm and thermodynamic studies
BackgroundDischarge of heavy metals such as hexavalent chromium (Cr (VI)) and nickel (Ni (II)) into aquatic ecosystems is a matter of concern in wastewater treatment due to their harmful effects on humans. In this paper, removal of Cr (VI) and Ni (II) ions from aqueous solution was investigated using an amino-functionalized magnetic Nano-adsorbent (Fesub3/subOsub4/sub-NHsub2/sub).MethodsAn amino-functionalized magnetic Nano-adsorbent (Fesub3/subOsub4/sub-NHsub2/sub) was synthesized by compositing Fesub3/subOsub4/sub with 1, 6-hexanediamine for removal of Cr (VI) and Ni (II) ions from aqueous solution. The adsorbent was characterized by Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), powder X-Ray Diffraction (XRD), and Vibrating Sample Magnetometry (VSM). Also, the effects of various operational parameters were studied.ResultsAccording to our finding, Fesub3/subOsub4/sub-NHsub2/sub could be simply separated from aqueous solution with an external magnetic field at 30?s. The experimental data for the adsorption of Cr (VI) and Ni (II) ions revealed that the process followed the Langmuir isotherm and the maximum adsorption capacity was 232.51?mg?gsup?1/sup for Cr (VI) at pH?=?3 and 222.12?mg?gsup?1/sup and for Ni(II) at pH?=?6 at 298 °K. Besides, the kinetic data indicated that the results fitted with the pseudo-second-order model (Rsup2/sup: 0.9871 and 0.9947?% for Cr (VI) and Ni (II), respectively. The results of thermodynamic study indicated that: standard free energy changes (ΔGsup?/sup), standard enthalpy change (ΔHsup?/sup), and standard entropy change (ΔSsup?/sup) were respectively ?3.28, 137.1, and 26.91?kJ?molsup?1/sup for Cr (VI) and ?6.8433, 116.7, and 31.02?kJ?molsup?1/sup for Ni (II). The adsorption/desorption cycles of Fesub3/subOsub4/sub-NHsub2/sub indicated that it could be used for five times.ConclusionsThe selected metals’ sorption was achieved mainly via electrostatic attraction and coordination interactions. In fact, Fesub3/subOsub4/sub-NHsub2/sub could be removed more than 96?% for both Cr (VI) and Ni (II) ions from aqueous solution and actual wastewater.
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机译：在水生生态系统中的重金属如六价铬（Cr（vi））和镍（Ni（ii））的背景是由于它们对人类的有害影响而令人担忧的废水处理问题。在本文中，使用氨基官能化磁性纳米吸附剂研究了来自水溶液的Cr（VI）和Ni（II）离子（Fe 3 O 4 - NH 2 ）。方法氨基官能化磁性纳米吸附剂（Fe 3 O 4 -nh 2 ）通过将Fe 3 / sup> O 4 用1,6-己二胺合成，得到来自水溶液的Cr（VI）和Ni（II）离子。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），粉末X射线衍射（XRD）和振动样品磁体（VSM），表征吸附剂。此外，研究了各种操作参数的效果。鉴定到我们的发现，Fe 3 O 4 -nh 2 可以简单地与含水分离溶液在30？s的外部磁场。用于Cr（VI）和Ni（II）离子的吸附的实验数据表明，该过程跟随Langmuir等温线和最大吸附能力为232.51Ω·mg？g α1用于cr（vi）在pH？3和222.12？mg？g Δ1和ni（ii）在pH =Δ=Δ6，在298°K。此外，动力学数据表明，Cr（vi）和Ni（ii）的伪二阶模型（R 2 ：0.9871和0.9947Ω％）。结果热力学研究表明：标准自由能量变化（ΔGΔ），标准焓变（Δhα），以及标准熵变（Δs？ ）分别是Δ3.28,137.1和26.91？kj？mol α1用于cr（vi）和α.6.8433,116.7和31.02？kj？mol ？1 ni（ii）。Fe 3 O 4 -nh 2 的吸附/解吸循环表明它可以使用五次.Conclusionsthe主要通过静电吸引和协调相互作用实现所选金属的吸附。实际上，Fe 3 O 4 -nh 2 可以删除超过来自水溶液和实际废水的Cr（VI）和Ni（II）离子的96.％。
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