LAPSE:2023.1765
Published Article
LAPSE:2023.1765
Lignite-Based N-Doped Porous Carbon as an Efficient Adsorbent for Phenol Adsorption
February 21, 2023
Abstract
The treatment of phenolic-containing wastewater has received increased attention in recent years. In this study, the N-doped porous carbons were prepared from lignite with tripolycyanamide as the N source, and their phenol adsorption behaviors were investigated. Results clearly showed that the addition of tripolycyanamide largely improved the surface area, micropore volume, N content and thus the phenol adsorption capacity of lignite-based carbons. The N-doped sample prepared at 700 °C showed a surface area of 1630 m2/g and a phenol adsorption capacity as high as 182.4 mg/g at 20 °C, which were 2.0 and 1.6 times that of the lignite-based carbon without N-doping. Pseudo-second order and Freundlich adsorption isotherm models could better explain the phenol adsorption behaviors over lignite-based N-doped porous carbon. Theoretical calculations demonstrated that phenol adsorption energies over graphitic-N (−72 kJ/mol) and pyrrolic-N (−74 kJ/mol) groups were slightly lower than that over the N-free graphite layer (−71 kJ/mol), supporting that these N-containing groups contribute to enhance the phenol adsorption capacity. The adsorption mechanism of phenol over porous carbon might be interpreted by the π−π dispersion interactions between aromatic-ring and carbon planes, which could be enhanced by N-doping through increasing π electron densities in the carbon plane.
The treatment of phenolic-containing wastewater has received increased attention in recent years. In this study, the N-doped porous carbons were prepared from lignite with tripolycyanamide as the N source, and their phenol adsorption behaviors were investigated. Results clearly showed that the addition of tripolycyanamide largely improved the surface area, micropore volume, N content and thus the phenol adsorption capacity of lignite-based carbons. The N-doped sample prepared at 700 °C showed a surface area of 1630 m2/g and a phenol adsorption capacity as high as 182.4 mg/g at 20 °C, which were 2.0 and 1.6 times that of the lignite-based carbon without N-doping. Pseudo-second order and Freundlich adsorption isotherm models could better explain the phenol adsorption behaviors over lignite-based N-doped porous carbon. Theoretical calculations demonstrated that phenol adsorption energies over graphitic-N (−72 kJ/mol) and pyrrolic-N (−74 kJ/mol) groups were slightly lower than that over the N-free graphite layer (−71 kJ/mol), supporting that these N-containing groups contribute to enhance the phenol adsorption capacity. The adsorption mechanism of phenol over porous carbon might be interpreted by the π−π dispersion interactions between aromatic-ring and carbon planes, which could be enhanced by N-doping through increasing π electron densities in the carbon plane.
Record ID
Keywords
Adsorption, lignite, N-doping, phenol
Subject
Suggested Citation
Xue Y, Chen Y, Shi L, Wu H, Zhang C, Cheng M, Li H, Li W, Niu Y. Lignite-Based N-Doped Porous Carbon as an Efficient Adsorbent for Phenol Adsorption. (2023). LAPSE:2023.1765
Author Affiliations
Xue Y: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Chen Y: Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
Shi L: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Wu H: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Zhang C: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Cheng M: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Li H: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Li W: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Niu Y: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Chen Y: Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
Shi L: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Wu H: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Zhang C: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Cheng M: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Li H: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Li W: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Niu Y: Collaborative Innovation Center of CO2 Conversion and Utilization, Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
Journal Name
Processes
Volume
10
Issue
9
First Page
1746
Year
2022
Publication Date
2022-09-02
ISSN
2227-9717
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PII: pr10091746, Publication Type: Journal Article
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LAPSE:2023.1765
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https://doi.org/10.3390/pr10091746
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