Yang Cai-Yu, Nguyen Nhat Thien, Ma Chih-Ming, Chang Chang-Tang
J Nanosci Nanotechnol. 2016 Feb;16(2):1945-51. doi: 10.1166/jnn.2016.12352.
In this study, Polyacrylonitrile (PAN) fibers were prepared by a simple and effective electrospinning method. Subsequently, the PAN fibers were modified by diethylenetriamine (DETA) to produce aminated polyacrylonitrile (APAN) fibers. Finally, the adsorbability of copper ions on the surface of the fibers was examined in an aqueous solution. The characteristics of APAN fibers were analyzed using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD); The surface amination was confirmed by FTIR. The adsorption data fitted well with the Freundlich isotherm. Thermodynamic parameters of the adsorption process were calculated. The standard Gibb's free energy change, standard enthalpy change, and standard entropy change was -1.46 KJ/mol, -54.72 kJ/mol, and -178.75 kJ/mol/K, respectively. Furthermore, the results show that adsorption of copper onto APAN fibers were spontaneous and exothermic in nature. The equilibrium adsorption capacity of PAN fibers was only 0.10 mg g(-1) for 10 mg L(-1) of copper solution removal under pH 6 and 298 K. In contrast, the equilibrium adsorption capacity of APAN fibers was 45.05 mg g(-1) under the same conditions. The prepared APAN fibers exhibit high efficiency for Cu(II) removal from Waste water and may be used as a reference for future investigation.
在本研究中，通过一种简单有效的静电纺丝方法制备了聚丙烯腈（PAN）纤维。随后，用二亚乙基三胺（DETA）对PAN纤维进行改性，以制备胺化聚丙烯腈（APAN）纤维。最后，在水溶液中考察了纤维表面对铜离子的吸附性能。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和X射线衍射（XRD）对APAN纤维的特性进行了分析；通过FTIR证实了表面胺化。吸附数据与Freundlich等温线拟合良好。计算了吸附过程的热力学参数。标准吉布斯自由能变化、标准焓变和标准熵变分别为-1.46 KJ/mol、-54.72 kJ/mol和-178.75 kJ/mol/K。此外，结果表明，铜在APAN纤维上的吸附是自发的且本质上是放热的。在pH 6和298 K条件下，对于10 mg L(-1)的铜溶液去除，PAN纤维的平衡吸附容量仅为0.10 mg g(-1)。相比之下，在相同条件下，APAN纤维的平衡吸附容量为45.05 mg g(-1)。所制备的APAN纤维对废水中Cu(II)的去除具有高效性，可为未来的研究提供参考。
