Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (10): 20-25.doi: 10.13475/j.fzxb.20180905406

• Fiber Materials • Previous Articles     Next Articles

Preparation of cellulose nanofibrils aerogel and its adsorption of methylene blue

XU Chunxia1,2, JIANG Shuai1,2, HAN Fuyi1,2, XU Fang1,2, LIU Lifang1,2()   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Textile Science & Technology, Ministry of Education, Donghua University, Shanghai 201620, China;
  • Received:2018-09-20 Revised:2019-06-16 Online:2019-10-15 Published:2019-10-23
  • Contact: LIU Lifang E-mail:lifangliu@dhu.edu.cn

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Abstract:

In order to solve the adsorption problem of methylene blue (MB) in dyeing wastewater, a cellulose nanofiber(CNF) aerogel was prepared from rice straw CNF suspension by freezing and thawing gel, displacing with tert-butanol solvent and freeze drying with liquid nitrogen. The morphology structure of the aerogel as well as its adsorption capacity to MB was characterized. The influences of adsorbent quality and solution pH value on the adsorption performance were also investigated. The adsorption mechanism was discussed by adsorption kinetics and adsorption isotherm model. The results show that the CNF aerogel obtained by freeze-drying of tert-butanol has a three-dimensional network structure which contains a large number of spider-like fibers with a diameter of 6-26 nm. The aerogel exhibits a porous structure with a specific surface area of 52.25 m2/g, and an average pore size of 28.82 nm. The pseudo-second-order adsorption kinetic and Freundlich adsorption isothermal model are more suitable for describing the adsorption process of methylene blue on CNF aerogel, with the theoretical maximum adsorption of 196.08 mg/g.

Key words: dyeing wastewater, aerogel, cellulose nanofiber, methylene blue, adsorption

CLC Number: 

  • O647.32

Fig.1

Morphologies of CNF aerogel (×50 000)"

Fig.2

N2 adsorption-desorption isotherm (a) and pore size distribution (b) of CNF aerogel"

Fig.3

Effect of adsorbent weight on adsorption capacity of CNF aerogels"

Fig.4

Effect of solution pH value on adsorption capacity of CNF aerogels"

Fig.5

Effect of contact time on adsorption capacity of CNF aerogels"

Fig.6

Pseudo-first-order (a) and Pseudo-second-order (b) kinetic for adsorption of MB by CNF aerogel"

Tab.1

Kinetic model parameters for adsorption of MB by CNF aerogel"

MB质量浓度/
(mg·L-1)		 实际测量
值/(mg·g-1)		 准一级动力学 准二级动力学
qe/(mg·g-1) k1/min-1 R2 qe/(mg·g-1) k2/min-1 R2
10 49.12 25.53 0.032 8 0.932 6 51.02 0.003 046 0.999 8
50 195.90 271.65 0.041 4 0.939 1 222.22 0.000 195 0.996 7

Fig.7

Langmuir(a) and Freundlich(b) adsorption isotherm for adsorption of MB by CNF aerogel at 25 ℃"

Tab.2

Adsorption isotherm parameter for adsorption of MB by CNF aerogel"

Langmuir模型 Freundlich模型
qmax/
(mg·g-1)		 KL/
(L·mg-1)		 R2 1/n KF/
(mg·g-1)		 R2
196.08 0.772 7 0.925 0 0.291 7 7.007 6 0.942 8
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