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二乙三胺辅助合成富含氨基的水热碳包覆的静电纺聚丙烯腈纤维吸附剂,用于去除 Cr(VI) 和 2,4-二氯苯氧乙酸。

Diethylenetriamine-assisted synthesis of amino-rich hydrothermal carbon-coated electrospun polyacrylonitrile fiber adsorbents for the removal of Cr(VI) and 2,4-dichlorophenoxyacetic acid.

机构信息

Alan G. MacDiarmid Institute, Jilin University, Changchun 130012, PR China.

Alan G. MacDiarmid Institute, Jilin University, Changchun 130012, PR China.

出版信息

J Colloid Interface Sci. 2017 Feb 1;487:297-309. doi: 10.1016/j.jcis.2016.10.057. Epub 2016 Oct 21.

Abstract

An environmentally benign and efficient hydrothermal carbonization method is widely applied for the preparation of carbon-based adsorbents. However, the adsorption capacity toward anionic species would be influenced due to the negatively charged surface of the traditional hydrothermal carbonaceous materials; moreover most of the carbonaceous materials were in the form of powder which restricted the practical applications. Herein, amino-rich hydrothermal carbon-coated electrospun polyacrylonitrile fiber (PAN@NC) adsorbents were obtained through one-step hydrothermal carbonization approach assisted by diethylenetriamine using polyacrylonitrile (PAN) fibers as the templates, which showed highly efficient adsorption for anionic pollutants. The PAN@NC fibers were characterized in detail to confirm their structures and composition. The flexible and robust PAN@NC fiber membrane exhibited high adsorption capacity and good regeneration and recycling ability toward the anionic metal ion Cr(VI) and herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). According to the Langmuir model, the adsorption behaviors showed monolayer adsorption capacities of 290.70mg/g and 164.47mg/g for Cr(VI) and 2,4-D, respectively, which were higher than that of many other adsorbents. Recycling study indicated that the removal efficiencies for both pollutants retained above 90% after five cycles. These findings demonstrate that PAN@NC fibers are promising adsorbents for the removal of anionic pollutants from wastewater solutions.

摘要

一种环境友好且高效的水热碳化方法被广泛应用于制备碳基吸附剂。然而,由于传统水热碳质材料带负电荷的表面,其对阴离子物质的吸附能力会受到影响;此外,大多数碳质材料呈粉末状,这限制了它们的实际应用。在此,通过一步水热碳化法,以二乙烯三胺为辅助剂,以聚丙烯腈(PAN)纤维为模板,制备了富含氨基的水热碳化碳涂层的静电纺 PAN 纤维(PAN@NC)吸附剂,该吸附剂对阴离子污染物表现出高效的吸附性能。详细表征了 PAN@NC 纤维以确认其结构和组成。柔性且坚固的 PAN@NC 纤维膜对阴离子金属离子 Cr(VI)和除草剂 2,4-二氯苯氧乙酸(2,4-D)表现出高吸附容量和良好的再生及循环利用能力。根据 Langmuir 模型,Cr(VI)和 2,4-D 的吸附行为分别表现出 290.70mg/g 和 164.47mg/g 的单层吸附容量,高于许多其他吸附剂。循环使用研究表明,在经过五次循环后,两种污染物的去除效率均保持在 90%以上。这些发现表明,PAN@NC 纤维是去除废水中阴离子污染物的一种很有前途的吸附剂。

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