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Polyethylenimine nanofibrous adsorbent for highly effective removal of anionic dyes from aqueous solution

聚乙烯亚胺纳米纤维吸附剂用于高效吸附水溶液中的阴离子型染料

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Abstract

We prepared a nanofibrous adsorbent for anionic dye removal from aqueous solution by electrospinning a modified polyethylenimine (m-PEI) and polyvinylidene fluoride (PVDF) blend. The electrospun nanofibrous adsorbent was confirmed to be a nanoscale, porous material with a positively charged surface; these characteristics are quite beneficial for anionic contaminant adsorption. Experimental adsorption of an anionic dye, methyl orange (MO), demonstrates that this adsorbent can rapidly remove MO from aqueous solution; its maximum adsorption capacity was 633.3 mg g−1, which is much higher than that of previously reported adsorbents. After immersion in a basic solution, the adsorbent was well regenerated and showed good recyclability. The adsorption performance of the nanofibrous adsorbent is greatly influenced by the temperature, initial MO concentration, and pH of the solution. We further found that MO adsorption onto the adsorbent can be described well by the pseudo-second-order kinetic model and Langmuir isotherm model. Weber-Morris plots suggested that the adsorption of MO onto the nanofibrous mat was affected by at least film diffusion and intraparticle diffusion. This study indicates that nanofibrous PEI composite mats could be promising for treatment of wastewater containing anionic dye.

摘要

本文通过静电纺丝法将聚甲基丙酸缩水甘油酯(GMA)修饰的支化聚乙烯亚胺(b-PEI), 即改性PEI(m-PEI)与聚偏氟乙烯(PVDF)混合溶液 制成m-PEI/PVDF纳米复合纤维毡, 并用于吸附去除水溶液中阴离子型染料. 通过SEM、ζ-电位等表征手段证明该纳米纤维毡的纤维直径在百纳 米级, 且纤维毡为多孔状, 表面带正电荷, 具有吸附阴离子型污染物的性能特征. 通过研究其对阴离子染料—甲基橙(MO)的吸附性能, 我们发现 该吸附剂可快速从水溶液中去除甲基橙且最大吸附容量达633.3 mg g−1, 大大优于已报道的相关吸附剂. 而且, 该吸附剂在NaOH溶液中浸泡可 快速再生, 表现出良好的重复利用性. 本文进一步研究了温度、初始浓度和溶液pH值对甲基橙在该吸附剂上的吸附行为的影响, 并证明该吸附 剂吸附甲基橙的行为符合准二级动力学模型和Langmuir吸附等温模型. Weber-Morris模型则表明甲基橙吸附到m-PEI/PVDF纳米纤维毡的过 程, 受液膜扩散和颗粒内扩散的控制. 此研究结果表明, m-PEI/PVDF纳米纤维毡有望应用于处理含阴离子染料或污染物的废水.

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Correspondence to Bowu Zhang  (张伯武) or Jingye Li  (李景烨).

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Yao Ma is currently a PhD candidate at Shanghai Institute of Applied Physics, Chinese Academy of Sciences, under the supervision of Prof. Jingye Li. Her research interest is mainly focused on the fabrication of functional nanofibrous materials by electrospinning and radiation technique and their application in wastewater treatment and drinking water purification.

Bowu Zhang obtained his PhD degree in 2012 under the supervision of Prof. Jingye Li from Shanghai Institute of Applied Physics, Chinese Academy of Sciences. And then he joined in the group of Prof. Jingye Li as an associate researcher. His recent research interest focuses on the functional nanocarbon materials and polymer materials for water relevant application.

Jingye Li obtained his PhD degree in polymer materials in 2002, under the supervision of Prof. Deyue Yan at Shanghai Jiao Tong University. After that, he began his research career focusing on the functional polymeric materials by radiation induced graft polymerization at Waseda University, Japan. From 2007, he became a full professor at Shanghai Institute of Applied Physics, Chinese Academy of Sciences. His research interest is developing novel materials by radiation techniques.

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Ma, Y., Zhang, B., Ma, H. et al. Polyethylenimine nanofibrous adsorbent for highly effective removal of anionic dyes from aqueous solution. Sci. China Mater. 59, 38–50 (2016). https://doi.org/10.1007/s40843-016-0117-y

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