Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (09): 156-166.doi: 10.13475/j.fzxb.20210603311

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Dye and heavy metal adsorption performance of zero-valent iron/graphene oxide blend absorbent

WANG Shuangshuang, JI Zhihao, SHENG Guodong, JIN Enqi()   

  1. Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing University, Shaoxing, Zhejiang 312000, China
  • Received:2021-06-10 Revised:2022-06-20 Online:2022-09-15 Published:2022-09-26
  • Contact: JIN Enqi E-mail:jdkxxh_2001@163.com

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Abstract:

In order to combat the serious pollution caused by dyes and heavy metal Cr(Ⅵ) in acid dye, zero-valent iron (Fe0)/graphene oxide (GO) compound was used as an adsorbent. The aqueous solutions containing Weak Acid Blue AS dye and heavy metal Cr(Ⅵ), respectively, were employed to simulate dye wastewater. The effects of the mass ratio of Fe0 and GO, the pH value of solution, and the initial mass concentration of dye and Cr(Ⅵ) on the adsorption performance were analyzed. The adsorption mechanism of Fe0/GO blend adsorbent for acid dye and Cr(Ⅵ) was investigated, and the adsorption thermodynamics and kinetics were studied. The results show that Fe0/GO blend adsorbent has the best adsorption capacity when the weight ratio is 4∶1. When the initial concentration of dye wastewater is 75 mg/L at 30 ℃ and pH is 4.0, the removal percentage is 85.6% after 12 h, and the maximum adsorption capacity reaches 85.6 mg/g. When the initial concentration of Cr(Ⅵ) is 75 mg/L at 30 ℃ and pH is 3.0, the removal percentage reaches 95.8% after 12 h, and the maximum adsorption capacity reaches 95.8 mg/g. The adsorption processes to both acid dye and Cr(Ⅵ) were both in accordance with the Langmuir model and the pseudo-second-order kinetic model.

Key words: graphene oxide, zero-valent iron, adsorption performance, Cr(VI), acid dye, dye wastewater

CLC Number: 

  • TS199

Fig.1

Fitting line between concentration and absorbance of Weak Acid Blue AS solution"

Fig.2

Fitting line of relationship between concentration and absorbance of Cr(Ⅵ) complex solution"

Tab.1

Adsorption capacity of Fe0/GO with different mass ratios for acid dyes and Cr(Ⅵ)"

m(Fe0)∶m(GO) 弱酸性蓝AS去除率/% Cr(Ⅵ)去除率/%
8∶1 76.9 9.8
4∶1 87.4 23.5
1∶1 84.7 18.8
1∶4 84.1 10.6
1∶2 77.9 7.3
纯Fe0 61.7 5.4
纯GO 43.9 2.9

Fig.3

Influence of pH value on adsorption performance"

Fig.4

Zeta potential of Fe0/GO in different pH solutions"

Fig.5

Influence of initial concentration of Weak Acid Blue AS on adsorption performance"

Fig.6

Influence of initial concentration of Cr(Ⅵ) on adsorption performance"

Tab.2

Adsorption capacity of common adsorbents for Weak Acid Blue AS"

吸附剂名称 qm/
(mg·g-1)		 吸附条件 参考文献
pH值 温度/K
阴离子交换纤维 8.3 2.0 353 [21]
硅藻土 17.2 5.0 298 [22]
壳聚糖插层蒙脱土 18.8 5.0 293 [23]
活性碳纤维 76.5 8.0 283 [24]
Fe0/GO 85.6 4.0 303 本文

Tab.3

Adsorption capacity of common adsorbents for Cr(Ⅵ)"

吸附剂名称 qm/
(mg·g-1)		 吸附条件 参考文献
pH值 温度/K
水化氯铝酸钙 3.5 6.0 298 [25]
磁性水葫芦生物炭 18.5 2.0 298 [26]
γ-Al2O3固载水滑石 49.2 3.0 298 [27]
铁铝水滑石 51.3 6.0 298 [28]
Fe0/GO 95.8 4.0 303 本文

Fig.7

Adsorption performance of Fe0/GO for mixed pollutants of Weak Acid Blue AS and Cr(Ⅵ) under optimized adsorption conditions"

Fig.8

Adsorption performance of Fe0/GO after regeneration and recycling"

Fig.9

SEM images of Fe0, GO and Fe0/GO before and after adsorption for Weak Acid Blue AS or Cr(Ⅵ). (a)Fe0 (×300); (b)GO (×1 000);(c)Fe0/GO (×300);(d)Fe0/GO after adsorbing Weak Acid Blue AS (×300);(e)Fe0/GO after adsorbing Cr(Ⅵ) (×300)"

Fig.10

Raman spectra of Weak Acid Blue AS and Fe0/GO before and after adsorbing Weak Acid Blue AS"

Fig.11

Raman spectra of Fe0/GO before and after adsorbing Cr(Ⅵ) and K2Cr2O7"

Fig.12

FT-IR spectra of Weak Acid Blue AS and Fe0/GO before and after adsorbing Weak Acid Blue AS"

Fig.13

FT-IR spectra of Fe0/GO before and after adsorbing Cr(Ⅵ) and K2Cr2O7"

Fig.14

XPS spectra of Fe0/GO after adsorbing Cr(Ⅵ)"

Fig.15

Adsorption isotherms of Weak Acid Blue AS adsorbed onto Fe0/GO using Langmuir (a) and Freundlich (b) models"

Fig.16

Adsorption isotherms of Cr(Ⅵ) adsorbed onto Fe0/GO using Langmuir(a) and Freundlich(b) models"

Tab.4

Adsorption isotherm parameters of Weak Acid Blue AS and Cr(Ⅵ) onto Fe0/GO"

污染物
名称		 Langmuir模型参数 Freundlich模型参数
b/
(L·mg-1)		 qmax /
(mg·g-1)		 R2 KF/
(mg1-n·Ln)		 n R2
弱酸性
蓝AS		 0.682 7 4.66 0.957 4 5.686 0.460 1 0.886 3
Cr (Ⅵ) 0.011 7 178.57 0.994 8 14.150 0.416 2 0.992 1

Fig.17

Pseudo-first-order (a) and pseudo-second-order (b) adsorption kinetics fitting lines of Weak Acid Blue AS adsorbed onto Fe0/GO"

Fig.18

Pseudo-first-order(a) and pseudo-second-order(b) adsorption kinetics fitting lines of Cr(Ⅵ) adsorbed onto Fe0/GO"

Tab.5

Adsorption kinetics parameters of Weak Acid Blue AS and Cr(Ⅵ) onto Fe0/GO"

污染物
名称		 准一级动力学参数 准二级动力学参数
k1×103 qe/
(mg·g-1)		 R2 k2×105 qe/
(mg·g-1)		 R2
弱酸性蓝AS 5.40 48.85 0.940 6 19.57 71.43 0.995 4
Cr (Ⅵ) 7.10 63.44 0.876 4 6.60 68.97 0.931 2
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