纺织学报 ›› 2020, Vol. 41 ›› Issue (05): 20-24.doi: 10.13475/j.fzxb.20190806305

• 纤维材料 • 上一篇    下一篇

聚乳酸/壳聚糖/Fe3O4超细纤维膜对酸性蓝MTR的吸附性能及机制

刘雷艮1(), 沈忠安2, 林振锋3, 陶金1   

  1. 1.常熟理工学院 纺织服装与设计学院, 江苏 常熟 215500
    2.吴江市桃源海润印染有限公司,江苏 吴江 215236
    3.苏州市苏净环保新材料有限公司, 江苏 苏州 215222
  • 收稿日期:2019-08-26 修回日期:2020-01-23 出版日期:2020-05-15 发布日期:2020-06-02
  • 作者简介:刘雷艮(1979—),女,副教授,博士。主要研究方向为微纳米纤维分离与吸附材料的研究与产品开发。E-mail: liuleiyin@aliyun.com。
  • 基金资助:
    江苏省科技厅社会发展项目(BE2017676);苏州市科技局民生科技项目(SS201725);苏州市科技局前瞻性应用研究项目(SYG201827)

Property and mechanism of poly(lactic acide)/chitosan/Fe3O4 superfine fibrous membrane adsorbing acid blue MTR

LIU Leigen1(), SHEN Zhongan2, LIN Zhenfeng3, TAO Jin1   

  1. 1. School of Textile Garment and Design, Changshu Institute of Technology, Changshu, Jiangsu 215500, China
    2. Wujiang Taoyuan Hairun Printing and Dying Co., Ltd., Wujiang, Jiangsu 215236, China
    3. Sujing Environmental Protection New Materials Co., Ltd., Suzhou, Jiangsu 215222, China
  • Received:2019-08-26 Revised:2020-01-23 Online:2020-05-15 Published:2020-06-02

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摘要：

为制备易回收、可生物降解的染料吸附材料,将聚乳酸(PLA)、壳聚糖(CS)和四氧化三铁(Fe3O4)共混溶于三氟乙酸(TFA)溶液中,通过静电纺丝技术制备得到PLA/CS/Fe3O4超细纤维膜,研究了PLA/CS/Fe3O4超细纤维膜的表面形貌、孔隙结构、表面元素及其对酸性蓝MTR的吸附动力学和吸附机制。结果表明:PLA/CS/Fe3O4超细纤维内外均有孔隙结构,纤维的直径为(158±81) nm,比表面积为14.7 m 2/g,平均孔径为15.6 nm,且共混静电纺丝并未改变CS中C—NH2和Fe3O4中Fe元素的化学状态;PLA/CS/Fe3O4超细纤维膜对酸性蓝MTR的平衡吸附量为156 mg/g,吸附动力学实验数据与Lagergren准二级吸附动力学模型吻合较好,表现为化学吸附机制。

关键词: 超细纤维膜, 吸附性能, 酸性染料, 壳聚糖, 四氧化三铁, 聚乳酸

Abstract:

In order to prepare recyclable and biodegradable adsorption materials for dyes, poly(lactic acide)/chitosan/Fe3O4 (PLA/CS/Fe3O4) superfine fibers were prepared by electrospinning through dissolving PLA, CS and Fe3O4 into trifluoroacetic acid (TFA). Surface morphology, porous structure, surface elements and adsorption kinetics and mechanism for adsorbing acid army blue MTR were studied. The results show that pores inside and outside of the PLA/CS/Fe3O4 fiber are created, with average pore diameter being 15.6 nm, the diameter of fiber is (158±81) nm, the specific surface area is 14.7 m 2/g, while the amount of C—NH2 in the CS and that of Fe in Fe3O4 remain the same. The equilibrium adsorption capacity of PLA/CS/Fe3O4 fibrous membrane is found to be 156 mg/g, its adsorption kinetics relatively agree with Lagergren pseudo-second-order kinetic model, and its adsorption mechanism is identified as chemical adsorption.

Key words: superfine fibrous membrane, adsorption property, acid dye, chitosan, ferroferric oxide, poly(lactic acide)

中图分类号: 

  • TS102.6

图1

PLA/CS和PLA/CS/Fe3O4共混超细纤维的表面和横截面SEM照片"

图2

PLA/CS和PLA/CS/Fe3O4的氮气吸附-脱附等温线及其孔径分布曲线"

图3

PLA/CS和PLA/CS/Fe3O4的XPS谱图"

图4

PLA/CS和PLA/CS/Fe3O4对酸性军蓝MTR的吸附量随时间的变化"

表1

PLA/CS和PLA/CS/Fe3O4吸附动力学参数"

样品名称 实验吸附量/
(mg·g-1)		 准一级动力学参数 准二级动力学参数
k1/
min-1		 q1e/
(mg·g-1)		 k2/
(g·mg-1·min-1)		 q2e/
(mg·g-1)
PLA/CS 114 0.004 6 0.869 6 58.265 0.008 5 0.998 1 117.6
PLA/CS/Fe3O4 156 0.004 7 0.797 5 62.992 0.006 2 0.998 6 161.3

图5

PLA/CS和PLA/CS/Fe3O4对酸性军蓝MTR吸附动力学模型线性拟合曲线"

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