Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (12): 8-15.doi: 10.13475/j.fzxb.20210905908

• Fiber Materials • Previous Articles     Next Articles

Preparation of catkin fiber biochar and its adsorption properties for Cr(VI) in dye wastewater

FU Weikang1, GUO Xiaojie2, PAN Mengtao1, SONG Juyan1, XI Bojun1()   

  1. 1. College of Textile and Garment, Shaoxing University, Shaoxing, Zhejiang 312000, China
    2. School of Material and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310000,China
  • Received:2021-09-16 Revised:2022-04-28 Online:2022-12-15 Published:2023-01-06
  • Contact: XI Bojun E-mail:xbj@usx.edu.cn

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Abstract:

In view of the serious pollution of hexavalent chromium Cr(VI) in acid mordant dye wastewater to water environment, KOH activated biochar (CBK) and NaOH activated biochar (CBN) were prepared by oxygen limiting pyrolysis with catkin fiber. The effects of pH value of a simulated dye waste liquid and dosage of adsorbent and temperature effect on the adsorption treatment of Cr(VI) by catkin fiber biochar were studied by adsorption batch experiment. The adsorption process was fitted by kinetic and thermodynamic models to explore the adsorption and fixation mechanism of Cr(VI) by catkin fiber biochar. The results show that the specific surface area of CBK is significantly larger than that of CBN, and the surface adsorption sites are increased. When the pH value of the solution is 2, the theoretical maximum adsorption capacity of Cr(VI) by CBK and CBN is 82.68 and 47.16 mg/g respectively. The adsorption process conforms to Freundlich thermodynamic model and quasi second-order kinetic model, which means that the adsorption process is mainly multi-molecular layer adsorption, accompanied by chemical adsorption. The adsorption reaction is spontaneous and endothermic, and the increase of temperature can significantly improve the adsorption capacity of catkin fiber biomass carbon for Cr(VI).

Key words: catkin fiber, biochar, heavy metals adsorption, Cr(VI), adsorption mechanism, dye waste liquid treatment

CLC Number: 

  • TS102.9

Fig.1

Iodine adsorption value of biochar prepared at different temperatures"

Fig.2

Infrared spectra of catkin fiber biochar"

Fig.3

XRD patterns of catkin fiber biochar"

Fig.4

SEM images of catkin fiber biochar"

Tab.1

BET test result of catkin fiber biochar"

生物质炭
编号		 比表面积/
(m2·g-1)		 总孔体积/
(cm3·g-1)		 平均孔
径/nm
CBK 211.90 0.13 2.47
CBN 74.40 0.11 6.10

Fig.5

Effect of pH value on Cr(VI) adsorption"

Fig.6

Effect of biochar dosage on Cr(VI) adsorption"

Fig.7

Adsorption kinetic model"

Tab.2

Kinetic fitting constants"

生物质炭
编号		 准一级动力学模型 准二级动力学模型
Qe/(mg·g-1) K1/min-1 R2 Qe/(mg·g-1) K2/(g·mg-1·min-1) R2
CBK 75.23 0.023 0.732 7 82.68 0.002 3 0.940 9
CBN 43.68 0.036 0.707 9 47.16 0.001 2 0.925 1

Tab.3

Thermodynamic fitting constants"

生物质炭
编号		 Langmuir模型 Freundlich模型
Qm/(mg·g-1) KL/(L·mg-1) R2 KF/(mg1-1/n·L1/n·g-1) n R2
CBK 101.86 0.96 0.579 4 58.17 6.82 0.969 6
CBN 57.73 0.41 0.669 4 28.94 6.22 0.942 1

Fig.8

Adsorption isotherm model"

Fig.9

Effect of temperature on Cr(VI) adsorption"

Fig.10

Thermodynamic fitting curves for Cr(VI) adsorption on CBK. (a) Ce-lnK curve; (b) T-1-lnK0 curve"

Tab.4

Thermodynamic parameters for Cr(VI) adsorption on CBK"

T/℃ ΔG0/
(kJ·mol-1)		 ΔH0/
(kJ·mol-1)		 ΔS0/
(J·mol-1·K-1)
20 -5.97 24.87 105.13
30 -6.89
40 -8.08
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