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Preparation and Cr (VI) adsorption of functionalized polyimide fibers
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-07-19 , DOI: 10.1002/app.52799 Wei Jia 1 , Jiang Du 1 , Ming Jiang 1 , Mengying Zhang 2 , Enlin Han 2 , Hongqing Niu 1 , Dezhen Wu 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-07-19 , DOI: 10.1002/app.52799 Wei Jia 1 , Jiang Du 1 , Ming Jiang 1 , Mengying Zhang 2 , Enlin Han 2 , Hongqing Niu 1 , Dezhen Wu 1
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In order to overcome the shortcomings of nanofiber membranes such as low mechanical properties and poor acid resistance, amino-rich functionalized polyimide (PI)-polyethyleneimine (PEI) fibers were successfully prepared in the study. The structure and morphology in each functionalization step were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), static contact angle, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS) measurements. The adsorption kinetics analysis showed that the adsorption process followed a pseudo-second-order model, and the adsorption isotherm could be described better by the Langmuir model indicating the adsorption process was mainly chemical and homogeneous monolayer adsorption. Furthermore, the maximum adsorption capacity based on the Langmuir model was about 50 mg g−1, and the calculated thermodynamic parameters demonstrated an endothermic process. Meantime, the PEI-grafted PI fibers also exhibited good regeneration performance and stable tensile strength during recycling tests process. In the first 3 adsorption–desorption cycles, the removal efficiency and tensile strength of PI-PEI fibers could be maintained up to 60.44% and 89.29% of the initial adsorption, respectively. This work achieved the function of removing Cr (VI) by combining the excellent high temperature resistance, acid resistance, and mechanical properties of PI fibers.
中文翻译：
功能化聚酰亚胺纤维的制备及Cr(VI)吸附
为了克服纳米纤维膜机械性能低、耐酸性差等缺点，该研究成功制备了富含氨基的功能化聚酰亚胺（PI）-聚乙烯亚胺（PEI）纤维。通过扫描电子显微镜 (SEM)、原子力显微镜 (AFM)、静态接触角、衰减全反射傅里叶变换红外光谱 (ATR-FTIR) 和 X 射线光电子能谱 (XPS) 表征每个功能化步骤中的结构和形态） 测量。吸附动力学分析表明，吸附过程遵循准二级模型，吸附等温线可以用Langmuir模型更好地描述，表明吸附过程主要是化学和均相单层吸附。此外，-1，并且计算的热力学参数证明了吸热过程。同时，PEI接枝的PI纤维在回收试验过程中也表现出良好的再生性能和稳定的拉伸强度。在前 3 个吸附-解吸循环中，PI-PEI 纤维的去除效率和拉伸强度可分别保持在初始吸附的 60.44% 和 89.29%。该工作结合了PI纤维优异的耐高温、耐酸性和力学性能，实现了去除Cr(VI)的功能。
更新日期：2022-07-19
中文翻译：
功能化聚酰亚胺纤维的制备及Cr(VI)吸附
为了克服纳米纤维膜机械性能低、耐酸性差等缺点，该研究成功制备了富含氨基的功能化聚酰亚胺（PI）-聚乙烯亚胺（PEI）纤维。通过扫描电子显微镜 (SEM)、原子力显微镜 (AFM)、静态接触角、衰减全反射傅里叶变换红外光谱 (ATR-FTIR) 和 X 射线光电子能谱 (XPS) 表征每个功能化步骤中的结构和形态） 测量。吸附动力学分析表明，吸附过程遵循准二级模型，吸附等温线可以用Langmuir模型更好地描述，表明吸附过程主要是化学和均相单层吸附。此外，-1，并且计算的热力学参数证明了吸热过程。同时，PEI接枝的PI纤维在回收试验过程中也表现出良好的再生性能和稳定的拉伸强度。在前 3 个吸附-解吸循环中，PI-PEI 纤维的去除效率和拉伸强度可分别保持在初始吸附的 60.44% 和 89.29%。该工作结合了PI纤维优异的耐高温、耐酸性和力学性能，实现了去除Cr(VI)的功能。
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