Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 148-155.doi: 10.13475/j.fzxb.20200800408

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Adsorption performance of chitosan based hybrid aerogel on reactive dyes

HE Xuemei(), MAO Haiyan, CAI Lu   

  1. School of Textiles and Clothing, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, China
  • Received:2020-08-03 Revised:2020-11-23 Online:2021-02-15 Published:2021-02-23

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Abstract:

In order to effectively remove reactive dyes in textile dyeing wastewater,and hence to reduce the impact on water environment and human health hazards, achitosan based hybrid aerogel (CS/WSK/PDA/TiO2) was prepared by solution blending and freeze-drying techniques, using chitosan(CS) polymer as the skeleton material, dopamine(WSK) as bio-adhesive agent, and chitin whisker(PDA) as cross-linking agent. The hybrid aerogel was used to absorb the Reactive Violet X-2R, Reactive Red KE-3B and Reactive Yellow M-3BE. The morphology and structure of the prepared chitosan hybrid aerogels were characterized by attenuated total reflection Fourier transform in frared spectroscopy and scanning electron microscope. The effects of different conditions on the adsorption performance of the hybrid aerogel were studied. The experimental results show that chitosan-based hybrid aerogels have lamellar, porous functional structure,and the nano titanium oxide is embedded in the chitosan based hybrid aerogel. When the adsorption conditions are set to 30 ℃ and neutral pH value,the adsorption capacity of CS/WSK/PDA/TiO2 aerogels for Reactive Violet X-2R, Reactive Red KE-3B and Reactive Yellow M-3RE Reaches 400 mg/g, 398.4 mg/g, and 404.9 mg/g, respectively. The adsorption kinetic results are well described by the pseudo-second order kinetic.

Key words: chitosan, aerogel, titanium dioxide, adsorption, reactive dye, wastewater treatment

CLC Number: 

  • TQ264.17

Fig.1

Chemical structure of three reactive dyes. (a) Reactive Violet X-2R;(b)Reactive Red KE-3B; (c) Reactive Yellow M-3RE"

Fig.2

ATR-FTIR spectra of hybrid aerogel"

Fig.3

Schematic diagram of structure of CS/WSK/PDA/TiO2 hybrid aerogel"

Fig.4

Optical images (a)and SEM images (×500) (b) of hybrid aerogel"

Fig.5

XRD pattern of hybrid aerogel"

Fig.6

Effect of pH value on adsorption capacity of hybrid aerogel"

Fig.7

Effect of temperature on capacity of hybrid aerogel"

Fig.8

Effect of aerogel dose on adsorption capacity of hybrid aerogel"

Fig.9

Effect of time on adsorption capacity of hybrid aerogel"

Fig.10

Fitted adsorption kinetic plots of three reactive dyes on hybrid aerogel. (a) Pseudo-first-order kinetic model; (b) Pseudo-second-order kinetic model"

Tab.1

Adsorption kinetic parameters of three reactive dyes on hybrid aerogel"

染料 准一级动力学模型 准二级动力学模型
k1/min-1 R2 k2/(min·g·mg-1) R2 Qmax/(mg·g-1)
活性红紫X-2R 0.039 12 0.937 1 0.000 902 0.999 9 400.0
活性红KE-3B 0.022 70 0.976 5 0.000 122 0.996 9 398.4
活性黄M-3RE 0.044 73 0.982 2 0.000 438 0.998 5 404.9

Fig.11

Adsorption isotherms plots for three reactive dyes on hybrid aerogel"

Fig.12

Fitted adsorption isotherms of three reactive dyes on hybrid aerogel. (a) Langmuir model; (b) Freundlich model"

Tab.2

Parameters of adsorption isotherms model for three reactive dyes on hybrid aerogel"

染料 Langmuir Freundlich
KL/(L ·mg-1) aL R2 KF/(mg(n-1)/n·L1/n·g-1) 1/n R2
活性红紫X-2R 8.344 0.029 54 0.984 5 23.11 0.422 2 0.984 9
活性红KE-3B 4.080 0.018 65 0.980 4 16.6 0.406 0 0.996 7
活性黄M-3RE 4.578 0.016 48 0.964 2 17.2 0.441 1 0.993 9
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