Polyimide-based carbon nanofibers: A versatile adsorbent for highly efficient removals of chlorophenols, dyes and antibiotics
Polyimide-based carbon nanofibers: A versatile adsorbent for highly efficient removals of chlorophenols, dyes and antibiotics
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DOI：
10.1016/j.colsurfa.2017.10.014
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
Y. Zhang;Haijian Ou;Huixian Liu;Yangli Ke;Weijun Zhang;G. Liao;Dongsheng Wang
中科院分区：
文献类型：
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作者：
Y. Zhang;Haijian Ou;Huixian Liu;Yangli Ke;Weijun Zhang;G. Liao;Dongsheng Wang
在这项研究中，通过静电纺丝聚酰胺酸溶液，然后进行热酰亚胺化和碳化，制备了基于聚酰亚胺（PI）的碳纳米纤维（CNF）。并评估了其去除 2,4-二氯苯酚 (2,4-DCP)、亚甲基蓝 (MB) 和四环素 (TC) 的多功能吸附性能。具有 715.89 m2g−1 高比表面积的 PI 基 CNF 对 2,4-DCP、MB 和 TC 的最大吸附量分别为 483.09 mg g−1、272.48 mg g−1 和 146.63 mg g−1。 MB 吸附效率高度依赖于 pH 值，最佳 pH 值为 11，而 CNF 在 4-7 和 3-7 的宽 pH 范围内对 TC 和 2,4-DCP 吸附表现良好。动力学和等温线实验分别与准二级动力学模型和Langmuir模型拟合良好。热力学参数表明吸附是自发且吸热的。此外，对基于PI的CNF的可重复使用性进行了评估，结果表明，连续5个循环后，2,4-DCP、TC和MB的去除仍保持高效。这项研究表明，CNFs应该是一种强大的吸附剂，可以去除水环境中的大量有机污染物。
In this study, polyimide (PI)-based carbon nanofibers (CNFs) were prepared via electrospining polyamic acid solutions followed by thermal imidization and carbonization. And its versatile adsorption performance for removal of 2,4-dichlorophenol (2,4-DCP), methylene blue (MB) and tetracycline (TC) was evaluated. PI-based CNFs with a high specific surface area of 715.89 m2g−1exhibited a maximum adsorption of 483.09 mg g−1, 272.48 mg g−1and 146.63 mg g−1for 2,4-DCP, MB and TC, respectively. The MB adsorption efficiency was highly pH-dependent with an optimal pH 11, while the CNFs performed well towards TC and 2,4-DCP adsorption in the wide pH range of 4–7 and 3–7. Kinetics and isotherm experiments were fitted well with pseudo-second-order kinetics model and Langmuir model, respectively. Thermodynamic parameters showed that adsorption was spontaneous and endothermic. Moreover, the reusability of PI-based CNFs was evaluated, and the result showed that the removal of 2,4-DCP, TC and MB was kept its high efficiency after 5 consecutive cycles. This study demonstrated that the CNFs should be a powerful adsorbent for the removal of a great number of organic pollutants from aqueous environments.