Fabrication of magnetic water-soluble hyperbranched polyol functionalized graphene oxide for high-efficiency water remediation.
Fabrication of magnetic water-soluble hyperbranched polyol functionalized graphene oxide for high-efficiency water remediation.
复制标题
磁性水溶性超支化多元醇功能化氧化石墨烯的制备用于高效水体修复
DOI：
10.1038/srep28924
复制
发表时间：
2016-06-29
影响因子：
4.6
通讯作者：
Du B
中科院分区：
文献类型：
--
作者：
Hu L;Li Y;Zhang X;Wang Y;Cui L;Wei Q;Ma H;Yan L;Du B
本文成功制备了磁性水溶性超支化多元醇功能化氧化石墨烯纳米复合材料（MWHPO-GO）并应用于水体修复。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、热重分析（TGA）、磁化曲线、zeta电位、扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析对MWHPO-GO进行了表征。 MWHPO-GO 在去除合成染料（亚甲基蓝（MB）和甲基紫（MV））和重金属（Pb(II)）方面表现出优异的吸附性能。此外，MWHPO-GO 可以通过磁分离从水中简单地回收。对于这三种污染物，准二阶方程和 Langmuir 模型分别与吸附动力学和等温线数据表现出良好的相关性。热力学结果(ΔG< 0, ΔH< 0, ΔS< 0)表明MB、MV和Pb(II)的吸附过程是可行的、放热的和自发的。提出了一种可能的吸附机制，其中 π-π 堆积相互作用、氢键相互作用和静电吸引主导了 MB/MV 的吸附，而螯合和静电吸引主导了 Pb(II) 的吸附。此外，优异的重现性赋予MWHPO-GO在水体修复中的应用潜力。
Magnetic water-soluble hyperbranched polyol functionalized graphene oxide nanocomposite (MWHPO-GO) was successfully prepared and applied to water remediation in this paper. MWHPO-GO was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), magnetization curve, zeta potential, scanning electron microscope (SEM) and transmission electron microscope (TEM) analyses. MWHPO-GO exhibited excellent adsorption performance for the removal of synthetic dyes (methylene blue (MB) and methyl violet (MV)) and heavy metal (Pb(II)). Moreover, MWHPO-GO could be simply recovered from water with magnetic separation. The pseudo-second order equation and the Langmuir model exhibited good correlation with the adsorption kinetic and isotherm data, respectively, for these three pollutants. The thermodynamic results (ΔG< 0, ΔH< 0, ΔS< 0) implied that the adsorption process of MB, MV and Pb(II) was feasible, exothermic and spontaneous in nature. A possible adsorption mechanism has been proposed where π-π stacking interactions, H-bonding interaction and electrostatic attraction dominated the adsorption of MB/MV and chelation and electrostatic attraction dominated the adsorption of Pb(II). In addition, the excellent reproducibility endowed MWHPO-GO with the potential for application in water remediation.