Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 129-134.doi: 10.13475/j.fzxb.20200805106

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of highly hollow biomass-based activated carbon fiber and its adsorption property to methylene blue

CHENG Lüzhu1, WANG Zongqian1(), WANG Dengfeng2, SHEN Jiakun1, LI Changlong1   

  1. 1. School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui 241000, China
    2. School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2020-08-10 Revised:2020-11-09 Online:2021-02-15 Published:2021-02-23
  • Contact: WANG Zongqian E-mail:wzqian@ahpu.edu.cn

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Abstract:

In order to improve the adsorption efficiency of activated carbon fiber to colored wastewater, the activated carbon fibers with highly hollow structures were prepared, using the calotropis gigantea fiber as the precursor, by phosphoric acid activation and high temperature carbonization. The morphology, chemistry and pore structures of the calotropis gigantean activated carbon fiber were characterized systematically by scanning electron microscopy-energy dispersive spectrometer, Fourier transform infrared spectrocopy methods. Meanwhile, the adsorption properties and mechanism of carbon fibers to methylene blue were analyzed. The results show that the average hollow degree of calotropis gigantea activated carbon fiber is more than 92%, and the fiber also exhibits a rough surface and develops mesoporous structures with the specific surface area and average pore diameter of 1 244.812 m 2/g and 3.744 nm, respectively. Moreover, the surface of carbon fiber is rich in elements O and P, which constitute the active surface of carbon fiber. The saturated adsorption capacity of the carbon fiber to methylene blue aqueous solution with initial mass concentration of 100 mg/L can reach 198.840 mg/g. The adsorption process to methylene blue follows the pseudo-second-order kinetic equation. The adsorption to methylene blue conforms to the Freundlich model, which is mainly multilayer adsorption.

Key words: biomass-based activated carbon fiber, calotropis gigantea fiber, methylene blue, adsorption, highly hollow structure, wastewater treatment

CLC Number: 

  • TQ424.1

Fig.1

Morphology of calotropis gigantea fiber(a) and its activated carbon fiber(b)"

Fig.2

Surface element distribution of activated carbon fiber"

Fig.3

FT-IR spectra of calotropis gigantea fiber and its activated carbon fiber"

Fig.4

N2 adsorption/desorption curve(a) and pore size distribution(b) of calotropis gigantean activated carbon fiber"

Fig.5

Adsorption rate curve of methylene blue"

Tab.1

Fitting kinetic parameters of methylene blue adsorption curve"

准一级动力学方程拟合 准二级动力学方程拟合
Qe/
(mg·g-1)		 K1/
min-1		 R12 Qe/
(mg·g-1)		 K2/
min-1		 R22
194.376 0.129 0.992 200.024 0.001 4 0.999

Fig.6

Adsorption isotherm of methylene blue"

Tab.2

Isotherm model fitting parameters"

Langmuir Freundlich
Qmax/
(mg·g-1)		 KL R2 nF KF R2
362.738 0.195 0.418 9.581 198.916 0.932
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