Journal of Textile Research ›› 2024, Vol. 45 ›› Issue (07): 140-149.doi: 10.13475/j.fzxb.20230900801

• Dyeing and Finishing Engineering • Previous Articles     Next Articles

Preparation of zeolitic imidazolate framework-8 and its adsorption performance on Congo Red

YANG Liang1(), KONG Hanhan1, LI Weilin1, QI Xiaofen1, ZHANG Tianyun1, WANG Xuemei1, LI Wenquan2   

  1. 1. School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
    2. Lanzhou Sanmao Industrial Co., Ltd., Lanzhou, Gansu 730316, China
  • Received:2023-09-08 Revised:2024-04-12 Online:2024-07-15 Published:2024-07-15

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Abstract:

Objective In order to solve the problem that printing and dyeing wastewater is harmful to the environment and difficult to treat, this research aims to prepare an economical and environmentally friendly adsorbent with excellent adsorption effect, and the adsorption performance of ZIF-8 on azo dyes represented by anionic Congo Red dyes was investigated.

Method In this research, 2-methylimidazole and Zn(NO3)2·6H2O were used as raw materials, and deionized water was used as solvent. The proportion of 2-methylimidazole, Zn(NO3)2·6H2O and deionized water was adjusted and they mixed by mechanical stirring to prepare the homogeneous and clear particles of zeolitic imidazolate framework-8 (ZIF-8) material under normal temperature and normal pressure conditions. The structure of the ZIF-8 material was tested by scanning electron microscopy(SEM), infrared spectrometry, X-Ray diffraction, thermogravimetry, BET and other characterization methods. The adsorption performance of the material on dyes was evaluated by the water-bath constant-temperature shaking method, and the factors affecting the adsorption and the adsorption mechanism were analyzed.

Results It was found from SEM images that the ZIF-8 section was smooth, and that the particles were uniform and had a polyhedral structure. Infrared spectra analysis and X-Ray diffraction results showed that the ZIF-8 material was consistent with the finding reported in docoments. Thermogravimetric analysis and specific surface area tests revealed that the thermal cleavage temperature of the ZIF-8 material was 258 ℃, and the ZIF-8 had a good thermal stability. The specific surface area of BET was 869.63 m2/g, the specific surface area of Langmuir was 1 140.03 m2/g, and the average pore size was 3.27 nm. The adsorption equilibrium was reached in a shorter time at the lower initial concentration, and the adsorption amount reached the maximum when the initial concentration was 95 mg/L. It was found that the adsorption would first rise, then fall and finally tend to equilibrium with the increase of ion concentration, and the adsorption amount could reach the maximum when pH was neutral. It was also revealed that the adsorption rate of ZIF-8 could still be maintained at 69% after 4 cycles. The adsorption of ZIF-8 on Congo Red was more in line with the pseudo-second-order model through the fitting of kinetic model, which was dominated by chemical adsorption. The adsorption isotherm model fitting showed that the adsorption of ZIF-8 on Congo Red was in line with the Langmuir model, which belonged to the adsorption of the monolayer molecules. It was believed that the whole adsorption process was an exothermic reaction, and the low temperature was favorable for the adsorption. Under the conditions of 20 ℃ and pH=7, the adsorption effect of ZIF-8 on 95 mg/L Congo Red solution was the best, and the maximum adsorption rate was 671.41 mg/g.

Conclusion ZIF-8 prepared using deionized water as the solvent is found to reduce cost compared to the situation with methanol as the solvent, and the operation is simple and safe compared to other preparation methods. The ZIF-8 particles prepared are uniform and clear, with good thermal stability and large specific surface area. ZIF-8 has better adsorption performance on anionic dyes represented by Congo Red, so it can be applied to the treatment of general anionic dye waste liquid.

Key words: zeolitic imidazolate framework-8, Congo Red, anionic dye, printing and dyeing wastewater, wastewater treatment, adsorption performance, adsorption mechanism

CLC Number: 

  • TS176

Fig.1

Standard curve of Congo Red"

Fig.2

SEM image of ZIF-8"

Fig.3

Infrared spectra of ZIF-8"

Fig.4

XRD patterns of ZIF-8"

Fig.5

Thermogravimetric diagram of ZIF-8"

Fig.6

Nitrogen adsorption-desorption diagram of ZIF-8"

Fig.7

Influence of initial mass concentration on adsorption"

Fig.8

Influence of ion concentration on adsorption"

Fig.9

Influence of pH value on adsorption capacity (a) and Zeta potential (b)"

Fig.10

Cycling performance of ZIF-8"

Fig.11

Adsorption kinetics model. (a) Pseudo-first-order adsorption kinetic model; (b) Pseudo-second-order adsorption kinetic model; (c) Internal diffusion model (IDM)"

Tab.1

Adsorption kinetic parameters"

C0/(mg·L-1) 准二级动力学模型 准一级动力学模型
qe/(mg·g-1) k2/(g·mg-1·min-1) qt/(mg·g-1) R2 k1/min-1 qt/(mg·g-1) R2
15 52.456 3 0.052 4 8.632 0 0.997 2 0.018 3 53.264 1 0.867 5
45 206.238 9 0.087 4 235.360 0 0.997 6 0.004 4 219.385 0 0.925 6
95 415.654 0 0.520 0 325.513 2 0.998 7 0.002 1 452.361 4 0.970 4

Tab.2

Internal diffusion model parameters"

温度/
℃		 表面扩散 中孔扩散 微孔扩散
K1 R 1 2 K2 R 2 2 K3 R 3 2
20 9.126 6 0.995 7 1.672 5 0.911 3 0.012 4 0.110 0
30 9.842 8 0.992 1 0.923 2 0.840 8 0.028 6 0.367 6
40 0.957 0 0.999 3 1.541 6 0.924 9 0.012 8 0.411 0

Tab.3

Adsorption isotherm parameters"


温度/
℃		 Freundlich模型 Langmuir模型
KF n R2 b/
(L·mg-1)		 qm/
(mg·g-1)		 R2
20 103.967 2 2.963 2 0.996 8 0.060 6 670.632 6 0.997 9
30 59.638 9 2.689 1 0.997 4 0.108 4 430.361 0 0.999 1
40 46.310 5 2.736 4 0.997 0 0.160 4 342.698 1 0.998 9

Fig.12

Adsorption isotherm model. (a) Adsorption isotherms of ZIF-8 on Congo Red; (b) Freundlich adsorption isotherm; (c) Langmuir adsorption isotherm; (d) Van't Hoff diagram"

Tab.4

Thermodynamic parameters of adsorption"

温度/
℃		 ΔG/
(kJ·mol-1)		 ΔS/
(J·mol-1·K-1)		 ΔH/
(kJ·mol-1)
20 -12.444 7 -156.802 0 -58.387 7
30 -10.876 7
40 -9.308 7

Fig.13

XRD patterns (a) and FT-IR spectra (b) before and after adsorption of ZIF-8"

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