聚丙烯腈
吸附
纳米纤维
甲基橙
静电纺丝
材料科学
朗缪尔吸附模型
解吸
化学工程
复合材料
高分子化学
化学
聚合物
有机化学
光催化
工程类
催化作用
作者
Peng Xu,Yan Wang,Shasha Wang,Wei Dai,Nannan Chen,Qun Li
标识
DOI:10.1080/10601325.2022.2092410
摘要
In this study, polyethyleneimine (PEI)-modified porous polyacrylonitrile electrospun (PPAN-PEI) nanofibers were successfully prepared and utilized as absorbent for removal of methyl orange from water. Porous polyacrylonitrile (PPAN) nanofibers were firstly generated by electrospinning method using polyvinylpyrrolidone as the pore-making agent. Then PPAN-PEI nanofibers were prepared by combining hydrolysis and amidoximation modification of the PPAN nanofibers. The obtained nanofibers are systematically characterized, and several basic parameters influencing the adsorption-based removal efficiency are researched, including pH of solution, temperature and contact time. The results show that the PPAN-PEI nanofibers with an average diameter of 480 nm and high specific surface area (43.520 m2 g−1) exhibited the high adsorption capacity (726.45 mg g−1 at pH 6) toward methylene orange (MO), and the adsorption isotherms and kinetic data are well fitted by Langmuir and pseudo-second-order kinetic models. Moreover, the adsorption efficiency toward MO by PPAN-PEI nanofibers still retained over 86.7% of its initial adsorption capacity after five adsorption/desorption cycles, which signify that the adsorbents are stable and recyclable. These superiorities make PPAN-PEI nanofibers a promising adsorbent for the removal of dyes.
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