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

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (6): 1694-1700.DOI: 10.1016/j.cjche.2019.12.017

• Energy, Resources and Environmental Technology • Previous Articles Next Articles

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

Yuhong Kang^1,2, Xianyong Wei^1,2, Guanghui Liu¹, Miao Mu², Xiangrong Ma^1,2, Yong Gao^1,2, Zhimin Zong¹

1 Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;
2 Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School of Chemistry and Chemical Engineering, Yulin University, Yulin, Shaanxi 71900, China

Received:2019-07-16 Revised:2019-12-08 Online:2020-07-29 Published:2020-06-28
Contact: Xianyong Wei
Supported by:
The authors greatfully acknowledged for the financial support from the National Natural Science Foundation of China (51762042), the (2019PT-18), the Science and Technology Program of Shaanxi Province (2017GY-136; 2018GY-086) and the Shaanxi Province Education Department Key Scientific Research Project (18JS123)

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

Yuhong Kang^1,2, Xianyong Wei^1,2, Guanghui Liu¹, Miao Mu², Xiangrong Ma^1,2, Yong Gao^1,2, Zhimin Zong¹

1 Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;
2 Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School of Chemistry and Chemical Engineering, Yulin University, Yulin, Shaanxi 71900, China

通讯作者: Xianyong Wei
基金资助:
The authors greatfully acknowledged for the financial support from the National Natural Science Foundation of China (51762042), the (2019PT-18), the Science and Technology Program of Shaanxi Province (2017GY-136; 2018GY-086) and the Shaanxi Province Education Department Key Scientific Research Project (18JS123)

Abstract

Abstract: Mineral matter in a residue (R_CG) from coal gasification (CG) was removed by two-stage acid leaching. Hierarchical activated carbon (HAC) was prepared by activating R_CG with CO₂. The performance of HAC on removing methylene blue (MB) from an aqueous solution was investigated. HAC was characterized by N₂ 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 m²·g^-1) and total pore volume (0.684 cm³·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.

Key words: Residue from coal gasification, Hierarchical activated carbon, Physical activation, Adsorption models

摘要： Mineral matter in a residue (R_CG) from coal gasification (CG) was removed by two-stage acid leaching. Hierarchical activated carbon (HAC) was prepared by activating R_CG with CO₂. The performance of HAC on removing methylene blue (MB) from an aqueous solution was investigated. HAC was characterized by N₂ 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 m²·g^-1) and total pore volume (0.684 cm³·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.

关键词: Residue from coal gasification, Hierarchical activated carbon, Physical activation, Adsorption models

Yuhong Kang, Xianyong Wei, Guanghui Liu, Miao Mu, Xiangrong Ma, Yong Gao, Zhimin Zong. 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, 28(6): 1694-1700.

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

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

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