纺织学报 ›› 2020, Vol. 41 ›› Issue (01): 15-20.doi: 10.13475/j.fzxb.20190201606

• 纤维材料 • 上一篇    下一篇

棉秆皮纤维素/氧化石墨烯纤维的制备及其力学性能和吸附性能

李阵群, 许多, 魏春艳(), 钱永芳, 吕丽华   

  1. 大连工业大学 纺织与材料工程学院, 辽宁 大连 116034
  • 收稿日期:2019-02-15 修回日期:2019-08-22 出版日期:2020-01-15 发布日期:2020-01-14
  • 通讯作者: 魏春艳
  • 作者简介:李阵群(1994—),男,硕士生。主要研究方向为功能纤维及材料。
  • 基金资助:
    辽宁省自然科学基金指导计划项目(2019-ZD-0295)

Preparation of cotton stalk bast cellulose/graphene oxide fiber and its mechanical properties and adsorption capacity

LI Zhenqun, XU Duo, WEI Chunyan(), QIAN Yongfang, LÜ Lihua   

  1. School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, Liaoning 116034, China
  • Received:2019-02-15 Revised:2019-08-22 Online:2020-01-15 Published:2020-01-14
  • Contact: WEI Chunyan

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摘要：

为提高纤维素基纤维的强力及其对阳离子染料亚甲基蓝的吸附能力,利用超声分散和湿法纺丝法,制备了含有不同质量分数氧化石墨烯(GO)的棉秆皮纤维素/GO纤维。借助透射电子显微镜、扫描电子显微镜、傅里叶红外光谱仪分析了棉秆皮纤维素/GO纤维的形态和结构,探讨了GO质量分数对纤维断裂强力和吸附量的影响,并对吸附实验数据进行拟合分析。结果表明:随着GO质量分数的增加,纤维的断裂强力先增大后减小;GO质量分数为0.4%时,纤维断裂强力最优为31.12 cN,与未添加GO的纤维相比断裂强力提高了84%;纤维对亚甲基蓝的吸附量随着GO质量分数的增加而增加,吸附过程符合准二级吸附动力学模型和Langmuir等温吸附模型,属于单分子层的吸附,吸附过程为自发的放热反应。

关键词: 棉秆皮纤维素, 氧化石墨烯, 湿法纺丝, 亚甲基蓝, 吸附性能

Abstract:

In order to improve the adsorption capacity of cellulose-based adsorbent fibers for cationic methylene blue dyes and the fiber strength, cotton stalk cellulose/graphene oxide (GO) fibers containing different mass fractions of GO were prepared by ultrasonic dispersion method and wet spinning method. The morphology and structure of the materials were analyzed by transmission electron microscopy, scanning electron microscopy and Fourier transform infrared spectroscopy. The effects of GO content on the breaking strength and adsorption capacity of the fibers were discussed. Fitting analysis was conducted on the experimental data of adsorption capacity. The results show that the breaking strength of the fiber increases first and then decreases with the increase of mass fraction of GO. When the mass fraction of GO was 0.4%, the fiber breaking strength peaked at 31.12 cN, which is 84% stronger than that without adding GO. The amount of methylene blue adsorption increases with the increase of GO mass fraction. The adsorption process conforms to the pseudo-second-order adsorption kinetic models and Langmuir isotherms adsorption model. The adsorption is related monolayer molecules, and the adsorption process is a spontaneous exothermic reaction.

Key words: cotton stalk bast cellulose, graphene oxide, wet spinning, methylene blue, adsorption capacity

中图分类号: 

  • TS102.2

图1

GO质量分数对纤维强力影响"

图2

GO质量分数对吸附量影响"

图3

吸附时间对吸附量的影响"

表1

温度对吸附性能的影响"

温度/K 吸附量/(mg·g-1) 去除率/%
303 9.83 98.3
313 9.58 95.8
323 7.91 79.1

表2

溶液pH值对吸附性能影响"

pH值 吸附量/(mg·g-1) 去除率/%
6 8.98 89.8
8 9.87 98.7
10 9.99 99.9

图4

亚甲基蓝质量浓度对吸附量影响"

图5

3种吸附动力学模型拟合结果"

表3

不同温度下等温方程拟合参数"

温度/K Langmuir等温吸附模型 Freundlich等温吸附模型
qm KL R2 1/n KF R2
303 23.96 83.67 0.999 0.175 13.52 0.983
313 19.28 56.01 0.985 0.168 11.22 0.984
323 16.75 55.5 0.997 0.282 7.24 0.817

图6

2种等温吸附模型拟合结果"

图7

氧化石墨烯的透射电子显微镜照片"

图8

纤维表面扫描电子显微镜照片"

图9

GO红外光谱图"

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