Journal of Textile Research ›› 2026, Vol. 47 ›› Issue (02): 255-263.doi: 10.13475/j.fzxb.20250909801

• Dyeing and Finishing Engineering • Previous Articles     Next Articles

Adsorption performance of jute fabric-based magnetic nitrogen-dope porous carbon for Cr(VI)

YUE Xianyang1,2, WANG Shaobo1,3, HUANG Xin1,3(), WANG Yanzhi1,2, LI Chongchong1, ZHANG Xiaoxiao1   

  1. 1 College of Intelligent Textile and Textile Electronics, Zhongyuan University of Technology, Zhengzhou, Henan 450007, China
    2 Collaborative Innovation Center of Advanced Textile Equipment and Technology Co-constructed by Ministry of Education and Henan Provincial Government, Zhengzhou, Henan 451191, China
    3 Zhengzhou Key Laboratory of Green Dyeing and Finishing Technology, Zhengzhou, Henan 451191, China
  • Received:2025-09-21 Revised:2025-12-08 Online:2026-02-15 Published:2026-04-24
  • Contact: HUANG Xin E-mail:xinhuang@zut.edu.cn

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Abstract:

Objective Cr(VI) heavy metal pollutants are highly toxic and carcinogenic, posing a severe threat to the natural ecological environment and human life and health. Adsorption is regarded as one of the most promising methods for treating Cr(VI)-containing wastewater. Porous carbon prepared from renewable biomass resources is an excellent adsorbent, but it is difficult to separate and recover. Nickel-iron layered double hydroxide (Ni-Fe-LDH) exhibits good magnetism and favorable adsorption performance for heavy metals. Combining the two can achieve complementary advantages of the materials. Herein, a jute fabric-based porous carbon composite material with in-situ loaded nano-film Ni-Fe-LDH was developed, aiming to enhance its adsorption capacity for Cr(VI) while enabling facile magnetic separation and recovery of the material.

Method Using jute fabric as the biomass substrate, fabric-like porous carbon (PC) was prepared via a combined physical-chemical activation method. Subsequently, the Ni-Fe-LDH/PC composite with in-situ loaded Ni-Fe-LDH was obtained by the hydrothermal method. The phase composition, structure, micromorphology, specific surface area and pore size distribution of the composite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and N2 adsorption-desorption isotherm. Moreover, the effects of Ni-Fe-LDH loading amount and solution pH on the Cr(VI) adsorption performance of the composite were investigated, and its adsorption thermodynamics, kinetics, and magnetic recovery performance were clarified.

Results The combination of Ni-Fe-LDH and PC can effectively enhance their adsorption capacity for Cr(VI). With the increase of Ni-Fe-LDH loading (within the range of 10% to 150%), the adsorption capacity of Cr(VI) by the composite material continuously decreases, but it is still higher than that of pure Ni-Fe-LDH and PC. When the loading amount of Ni-Fe-LDH was set to 10% of the mass of PC, the composite material (10%Ni-Fe-LDH/PC) exhibited maximum adsorption capacity for Cr(VI). This composite not only retained the fabric structure but also was loaded with nano-film Ni-Fe-LDH, with a specific surface area of 1 070.19 m2/g. Its pore size was mainly distributed between 0.6 and 0.9 nm, showing a microporous structure. Under the conditions of initial Cr(VI) mass concentration of 50 mg/L and the composite material dosage of 0.4 g/L, 10%Ni-Fe-LDH/PC achieved the maximum adsorption capacity for Cr(VI) (up to 88.05 mg/g) when the solution pH was 2. The adsorption of Cr(VI) by this composite conformed to the Freundlich multimolecular layer heterogeneous adsorption model. Additionally, the adsorption process followed the pseudo-second-order kinetic model, indicating that the adsorption of Cr(VI) was mainly chemical adsorption. Furthermore, the adsorption capacity of 10%Ni-Fe-LDH/PC for Cr(VI) was 1.47 times that of commercial powder activated carbon and 1.80 times that of the commercial granular activated carbon, and its magnetic response speed was less than 2 s.

Conclusion In this paper, jute fabric was used as the biomass substrate, and the Ni-Fe-LDH/PC composite was successfully prepared via the combined physical-chemical activation method and hydrothermal method. The composite, 10%Ni-Fe-LDH/PC, retains the fabric structure with a specific surface area up to 1 070.19 m2/g. It achieves maximum adsorption capacity for Cr(VI) (88.05 mg/g) when the solution pH is 2. The adsorption of Cr(VI) by this composite conforms to the Freundlich multimolecular layer adsorption model, and the adsorption of Cr(VI) is mainly chemical adsorption. In addition, its adsorption effect on Cr(VI) is superior to that of commercial powdered activated carbon and granular activated carbon, and it has a fast magnetic separation response speed, showing good application potential.

Key words: jute fabric, porous carbon, nickel-iron layered double hydroxide, heavy metal adsorption, Cr(VI), wastewater treatment, waste textile, hydro-thermal method

CLC Number: 

  • TS102.9

Fig.1

XRD patterns of composite materials"

Fig.2

SEM images of 10% Ni-Fe-LDH/PC and PC"

Tab.1

Comparison of elements present in 10% Ni-Fe-LDH/PC and PC"

元素 PC 10%Ni-Fe-LDH/PC
质量占比 原子占比 质量占比 原子占比
C 89.26 91.54 77.28 82.39
O 9.04 6.96 17.08 13.67
N 1.70 1.50 3.89 3.56
Ni 0 0 1.6 0.35
Fe 0 0 0.16 0.04

Fig.3

Comparison of nitrogen adsorption-desorption isotherms(a) and pore size distributions(b) between 10% Ni-Fe-LDH/PC and PC"

Fig.4

Comparison of adsorption effect of Cr(VI) by composites with different LDH loading rates"

Fig.5

Influence of solution pH on Cr(VI) adsorption performance of 10% Ni-Fe-LDH/PC"

Fig.6

Thermodynamic model fitting graph"

Tab.2

Constants of Langmuir and Freundlich adsorption models"

Langmuir模型 Freundlich模型
Q0 b R2 k n R2
105.018 3 10.868 9 0.789 2 78.127 3 11.013 2 0.923 5

Fig.7

Adsorption kinetics curve of Cr(VI) by 10% Ni-Fe-LDH/PC"

Fig.8

Fitting graphs of adsorption kinetics. (a) Quasi-first-order equation; (b) Quasi-second-order equation"

Tab.3

Fitting values of kinetic models for adsorption of Cr(VI) by 10% Ni-Fe-LDH/PC"

起始质量
浓度C0/
(mg·L-1)		 准一级动力学模型 准二级动力学模型
k1/
h-1		 Qe/
(mg·g-1)		 R2 k2/
(g·(mg· h)-1)		 Qe/
(mg·g-1)		 R2
75 0.166 9 34.59 0.907 1 0.016 3 102.04 0.999 1

Fig.9

Comparison of Cr(VI) adsorption performance between 10% Ni-Fe-LDH/PC and commercial activated carbon"

Fig.10

Verification results of magnetic responsiveness of 10% Ni-Fe-LDH/PC after adsorbing Cr(VI). (a) When magnet is not close; (b) When magnet is close for 2 s; (c) 5 s after removing magnet"

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