CO<sub>2</sub>-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal

Yuhong Kang; Xianyong Wei; Guanghui Liu; Miao Mu; Xiangrong Ma; Yong Gao; Zhimin Zong

doi:10.1016/j.cjche.2019.12.017

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CO₂-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal

Energy, Resources and Environmental Technology | Updated：2026-01-06

- CO₂-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal
- Chinese Journal of Chemical Engineering Issue 6, Pages: 1694-1700(2020)
- Affiliations：
  
  1. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology,Jiangsu,Xuzhou,China,221116
  2. Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School of Chemistry and Chemical Engineering, Yulin University,Shaanxi,Yulin,China,71900
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2019.12.017
  CLC：
- Published：2020
- Accepted：
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Yuhong Kang, Xianyong Wei, Guanghui Liu, et al. CO₂-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal[J]. Chinese Journal of Chemical Engineering, 2020, (6): 1694-1700. DOI: 10.1016/j.cjche.2019.12.017.
DOI：

Yuhong Kang, Xianyong Wei, Guanghui Liu, et al. CO₂-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal[J]. Chinese Journal of Chemical Engineering, 2020, (6): 1694-1700. DOI: 10.1016/j.cjche.2019.12.017. DOI：

摘要

Abstract

Mineral matter in a residue (R

) from coal gasification (CG) was removed by two-stage acid leaching. Hierarchical activated carbon (HAC) was prepared by activating R

with CO

. The performance of HAC on removing methylene blue (MB) from an aqueous solution was investigated. HAC was characterized by N

adsorption-desorption isotherm

Fourier transform infrared spectroscopy

and scanning electron microscopy. The results show that HAC exhibits hierarchical pore structure with high specific surface area (862.76 m

·g

-1

) and total pore volume (0.684 cm

·g

-1

)

and abundant organic functional groups. The adsorption equilibrium data of MB on HAC are best fitted to the Redlich-Peterson. The kinetic data show that the pseudo-first-order model is more suitable at low MB concentration

while the advantages of the pseudo-second-orderand the Elovich models are more obvious as the concentration increases. According to the thermodynamic parameters

the HAC-MB adsorption process is spontaneous and endothermic.

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CO2-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal

DOI：10.1016/j.cjche.2019.12.017

摘要

Abstract

关键词

Keywords

references

CO₂-hierarchical activated carbon prepared from coal gasification residue: Adsorption equilibrium, isotherm, kinetic and thermodynamic studies for methylene blue removal