Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (06): 133-139.doi: 10.13475/j.fzxb.20200805907

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• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Synthesis of nanoscale iron supported on expanded graphite for removal of chromium (Ⅵ) and dyes from water

TIAN Liqiang1,2(), LIANG Min3, LONG Kang2, CHEN Xiuqing4   

  1. 1. Key Laboratory of Green Preparation and Functionalization for Inorganic Materials (Shaanxi University of Science & Technology), Xi'an, Shaanxi 710021, China
    2. College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
    3. College of Art and Design, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
    4. Department of Chemical Engineering, Yangzhou Polytechnic Institute,Yangzhou, Jiangsu 225127, China
  • Received:2020-08-05 Revised:2021-03-02 Online:2021-06-15 Published:2021-06-28

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Abstract:

For dyes and Cr (VI) stripped from metallic roller in the printing process, two new adsorbents, nanoscale zero-valent iron (GS-NZVI) and nanoscalezero-valent iron supported on expanded graphite (GS-EG-NZVI) were green-synthesized. The two adsorbents were characterized by field emission electron microscopy, energy dispersive spectrometer, X-ray diffraction, etc. GS-EG-NZVI was investigated on the removal of Cr(VI) and dyes of aqueous solution, and on the corresponding dynamics and stability. Results indicated that nanoscalezero-valent iron was successfully loaded on the surface of EG with good dispersion. For the aqueous solution including 50 mg/L Cibacron Dark Blue and 20 mg/L Cr (Ⅵ), addition of 2.5 g/L GS-EG-NZVI led to the achievements of the removal rates of 90.6% of dyes and 53.6% of Cr (VI) respectively under the conditions of at 50 ℃, pH=2, 35 min reaction time with ultrasound assistance. The two removal processes fitted well with the pseudo second-order dynamic model. GS-EG-NZVI showed higher potential for removing Cr(Ⅵ) in aqueous solution than GS-NZVI due to its high stability after being placed in the air for different time.

Key words: expanded graphite, nanoscale iron, Cr(Ⅵ), dye, adsorption, wastewater treatment

CLC Number: 

  • X703

Fig.1

FESEM images of different specimens"

Fig.2

EDS images of different specimens"

Fig.3

TEM image of GS-NZVI(×100 000)"

Fig.4

FT-IR spectra of different specimens"

Fig.5

XRD images of different specimens"

Tab. 1

Specific surface area of different specimens"

样品 比表面积/(m2·g-1) 吸附累计孔体积/(cm3·g-1)
EG 137.5 0.227
GS-EG-NZVI 145.9 0.221

Fig.6

Effect of reaction time on removal rate of dye and Cr(Ⅵ)"

Fig.7

Effect of dosage of GS-EG-NZVI on removal rate of dye and Cr(Ⅵ)"

Fig.8

Effect of pH on removal rate of dye and Cr(Ⅵ)"

Fig.9

Effect of temperature on removal rate of dye and Cr(Ⅵ)"

Tab.2

Effect of storage days of GS-EG-NZVI and GS-NZVI on removal rate of Cr(Ⅵ)"

放置时间/d Cr(Ⅵ)去除率/%
GS-EG-NZVI GS-NZVI
1 53 52
2 52 50
4 52 44
7 50 35
10 45 25
15 40 10

Tab.3

Constants for kinetics for adsorption of dye and Cr(Ⅵ) on GS-EG-NZVI"

污染物 C0/
(mg·L-1) 		qexq/
(mg·g-1) 		伪一级动力学模型 伪二级动力学模型
k1/
min-1 		qeq/
(mg·g-1) 		R2 k2/
(mg·mg-1·min-1) 		qeq/
(mg·g-1) 		R2
染料 50 42.5 0.042 34.45 0.913 5 0.174 43.29 0.999
Cr(Ⅵ) 20 2.18 0.175 1.39 0.899 6 0.203 2.07 0.992
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