纺织学报 ›› 2022, Vol. 43 ›› Issue (03): 64-70.doi: 10.13475/j.fzxb.20210205807

• 纤维材料 • 上一篇    下一篇

杯芳烃/还原氧化石墨烯纤维的制备及其选择性吸附性能

陶旭晨(), 李林, 徐珍珍   

  1. 安徽工程大学 纺织服装学院, 安徽 芜湖 241000
  • 收稿日期:2021-02-23 修回日期:2021-10-07 出版日期:2022-03-15 发布日期:2022-03-29
  • 作者简介:陶旭晨(1982—),男,教授,硕士。主要研究方向为功能性纳米纤维。E-mail: taoxuchen@ahpu.edu.cn。
  • 基金资助:
    安徽省自然科学基金项目(1808085ME145);安徽省高校优秀青年人才支持计划项目(gxyq2018022)

Preparation and selective adsorption of calixarene/reduced graphene oxide fibers

TAO Xuchen(), LI Lin, XU Zhenzhen   

  1. College of Textiles and Clothing, Anhui Polytechnic University, Wuhu, Anhui 241000, China
  • Received:2021-02-23 Revised:2021-10-07 Published:2022-03-15 Online:2022-03-29

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摘要：

为提升杯芳烃纤维对Pt(Ⅱ)的平衡吸附量,依次通过酰胺化、还原法和静电纺丝法制备了杯芳烃/还原氧化石墨烯(CrGO)纤维。借助扫描电子显微镜、红外光谱仪、拉曼光谱仪和热重分析仪分析了纤维的结构与性能,并采用吸附实验研究了纤维的吸附选择性、吸附动力学及吸附等温模型。结果表明:CrGO纤维直径为(2±0.5)μm,具有褶皱的形貌,低水平的微观结构缺陷和良好的热稳定性;在Na(Ⅰ)、Hg(Ⅱ)共存时,CrGO纤维呈现出对Pt(Ⅱ)的选择性吸附能力,且符合假二级吸附动力学模型、Langmuir吸附等温模型;CrGO纤维的吸附行为主要归因于单分子层、化学型、吸热型、优惠型吸附;293 K温度下CrGO纤维在240 min时达到吸附平衡,平衡吸附量为113 mg/g,较杯芳烃聚酰亚胺纤维提升了303%。

关键词: 杯芳烃, 还原氧化石墨烯, 石墨烯纤维, 选择性吸附, 吸附动力学, 静电纺丝

Abstract:

In order to enhance the equilibrium adsorption capacity of calixarene fibers for Pt (Ⅱ), calixarene/reduced graphene oxide (CrGO) fibers were prepared through amidation, reduction and electrospinning. CrGO fibers were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, Raman spectrograph and thermogravimetric analyzer. The adsorption selectivity, adsorption kinetics and adsorption isotherm model of CrGO fibers were investigated. The results indicate that CrGO fibers with diameter of (2±0.5) μm possess some wrinkled morphology, low level of microstructure defects and a high thermal stability. In the presence of Na(I) and Hg (Ⅱ), CrGO fibers exhibit selective adsorption for Pt (Ⅱ), which fits with the pseudo second order adsorption kinetic model and Langmuir adsorption isothermal model. The adsorption behavior of CrGO fibers is mainly attributed to monolayer, chemical, endothermic and preferential adsorption. The equilibrium adsorption capacity of CrGO fibers reaches 113 mg/g at the temperature of 293 K for 240 min, which demonstrates an enhancement by 303% compared with calixarene polyimide fibers.

Key words: calixarene, reduced graphene oxide, graphene fiber, selective adsorption, adsorption kinetics, electrospinning

中图分类号: 

  • TQ342.86

图1

CrGO纤维制备方法"

图2

不同放大倍数下CrGO纤维的SEM照片"

图3

GO、硫醚杯芳烃、CrGO纤维的红外光谱图"

图4

GO、硫醚杯芳烃、CrGO纤维的拉曼光谱图"

图5

GO和CrGO纤维的热重曲线"

表1

GO及CrGO纤维对不同金属离子的平衡吸附量"

纤维名称 金属离子平衡吸附量平均值/ (mg·g-1)
Na(Ⅰ) Pt(Ⅱ) Hg(Ⅱ)
GO纤维 115.58 20.33 18.34
CrGO纤维 10.21 108.65 40.42

图6

推测的配位模型"

图7

CrGO纤维对Pt(Ⅱ)的吸附动力学曲线"

表2

吸附等温模型相关参数"

温度/
K		 Langmuir模型 Freundlich模型
qm/
(mg·g-1)		 KL/
(L·mg-1)		 相关系数
R2		 n KF/
(mg·g-1)		 相关系数
R2
283 97.08 0.173 9 0.988 7 3.26 20.91 0.908 4
293 120.48 0.137 2 0.997 6 3.37 25.08 0.838 3
303 129.87 0.130 1 0.976 1 2.84 23.39 0.821 1
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