Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (02): 53-60.doi: 10.13475/j.fzxb.20211101808

• Fiber Materials • Previous Articles     Next Articles

Adsorption performance of cellulose/chitosan magnetic aerogel prepared by freeze-thawing method

WEI Na'na, LIU Die, MA Zheng, JIAO Chenlu()   

  1. College of Light-Textile Engineering and Art, Anhui Agricultural University, Hefei, Anhui 230036, China
  • Received:2021-11-03 Revised:2021-11-22 Online:2022-02-15 Published:2022-03-15
  • Contact: JIAO Chenlu E-mail:jiaochenlu2013@163.com

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Abstract:

In order to develop an efficient and renewable magnetic biomass-based adsorbent, microcrystalline cellulose (MCC)/chitosan (CS) magnetic aerogel was synthesized via a combination method of floating droplet and freeze-thawing, in which MCC and CS worked as the network frameworks, and Fe3O4 nanoparticles endowed the magnetic property. The morphology and chemistry performance of MCC/CS magnetic aerogel were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction, and its removal performance for Congo Red was discussed. The results showed that when 1.0 g Fe3O4 nanoparticles was incorporated, MCC/CS magnetic aerogel present a porous network structure with lamellar accumulation and good magnetic response with Fe3O4 nanoparticles evenly distributed on the lamellar frames. The optimal adsorption conditions for Congo Red were found to be pH 5.0, dye initial concentration 400 mg/L and MCC/CS magnetic aerogel dosage 0.5 g/L. The adsorption process followed the pseudo-second order kinetics equation and Langmuir isotherm model, and the maximum monolayer adsorption capacity of MCC/CS magnetic aerogel for Congo Red was estimated to be 304 mg/g. The regeneration study demonstrated that the adsorption capacity retained about 86.5% of its initial level at the 5th sequential regeneration cycle, indicating that MCC/CS magnetic aerogel can be used as a high-efficient and renewable biomass-based adsorbent for dye wastewater treatment.

Key words: microcrystalline cellulose, chitosan, freeze-thawing method, magnetic aerogel, Congo Red, adsorption performance, printing and dyeing wastewater treatment

CLC Number: 

  • TS102.2

Fig.1

Schematic diagram of synthesis of MCC/CS magnetic aerogel and its use for removal of CR"

Fig.2

SEM images of MCC/CS magnetic aerogels with various Fe3O4 content"

Fig.3

FT-IR spectra of MCC, CS, Fe3O4 and MCC/CS magnetic aerogel"

Fig.4

Crystal structures of MCC, CS, Fe3O4 and M-MCC/CS magnetic aerogel"

Fig.5

TG-DTG curves of MCC, CS, Fe3O4 and MCC/CS magnetic aerogel. (a) TG curves; (b) DTG curves"

Fig.6

Hysteresis loop of MCC/CS magnetic aerogel"

Fig.7

Effects of time(a) and pH(b) on adsorption capacity of MCC/CS magnetic aerogel for CR"

Fig.8

Effect of dye initial concentration(a) and aerogel dosage(b) on adsorption capacity of MCC/CS magnetic aerogel for CR"

Fig.9

Fitted adsorption kinetic plots of M-MCC/CS magnetic aerogel for CR. (a) Pseudo-first order; (b) Pseudo-second order"

Tab.1

Kinetic parameters for CR adsorption onto MCC/CS magnetic aerogel"

吸附量/
(mg·g-1)		 准一级动力学模型 准二级动力学模型
Q1e/(mg·g-1) k1/min-1 R2 Q2e/(mg·g-1) k2/(g·mg-1·min-1) R2
222 244.7 0.02 0.987 0 333.3 6.4×10-5 0.991 3

Fig.10

Fitted adsorption isotherms of MCC/CS magnetic aerogel for CR. (a) Langmuir isotherm plot; (b) Freundlich isotherm plot"

Tab.2

Langmuir and Freundlich parameters for CR adsorption onto MCC/CS magnetic aerogel"

Langmuir Freundlich
Qm/
(mg·g-1)		 kL/
(L·mg-1)		 R2 kF/
(L·mg-1)		 n R2
304 0.006 3 0.993 8 10.8 2.0 0.943 5

Fig.11

Regeneration performance of MCC/CS magnetic aerogel"

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