Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (01): 15-20.doi: 10.13475/j.fzxb.20190201606

• Fiber Materials • Previous Articles     Next Articles

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 E-mail:weicy@dlpu.edu.cn

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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

CLC Number: 

  • TS102.2

Fig.1

Effect of GO content on fiber strength"

Fig.2

Effect of GO content on adsorption capacity"

Fig.3

Effect of adsorption time on adsorption capacity"

Tab.1

Effect of temperature on adsorption properties"

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

Tab.2

Effect of pH value on adsorption properties"

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

Fig.4

Effect of MB concentration on adsorption capacity"

Fig.5

Fitting results of pseudo-first-order(a),pseudo-second-order(b)adsorption kinetic models and intraparticle diffusion kinetic models(c)"

Tab.3

Adsorption kinetic parameters for different kinetic models"

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

Fig.6

Fitting results of Langmuir(a)and Freundlich(b)isothermal adsorption model"

Fig.7

TEM image of GO"

Fig.8

SEM images of fiber surface. (a) Cotton stalk cellulose fibers; (b) Cotton stalk bast cellulose/GO fibers"

Fig.9

FT-IR spectra of GO"

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