Low temperature and facile synthesis of nitrogen-doped hierarchical porous carbon derived from waste polyethylene terephthalate for efficient CO2 capture
Abstract
Waste polyethylene terephthalate (PET) with high carbon content (>60 wt%) has shown great potential in the field of synthesizing carbon materials for CO 2 capture, attracting increasing attention. Herein, an innovative strategy was proposed to synthesize nitrogen-doped hierarchical porous carbon (PC) for CO 2 capture using PET as precursor and sodium amide (NaNH 2) as both nitrogen dopant and low-temperature activator. As-synthesized N-doped PC exhibited a significantly high micropore volume of 0.755 cm 3/g and a rich content of N- and O-containing functional groups, offering ample active sites for CO 2 molecules. Further, the adsorbents demonstrated excellent CO 2 capture capacity, achieving 5.7 mmol/g (0 °C) and 3.3 mmol/g (25 °C) at 1 bar, respectively. This was primarily attributed to the synergistic effect of narrow micropores filling and electrostatic interactions. Moreover, as-synthesized PC exhibited rapid CO 2 adsorption capability, and its dynamic adsorption process was effectively described using a pseudo-second-order kinetic model. After five consecutive cycles, PET-derived PC still maintained ~100 % of adsorption capacity. They also possessed good CO 2/N 2 selectivity and reasonable isosteric heat of adsorption. Therefore, as-synthesized nitrogen-doped PC is a promising CO 2 adsorbent through low-temperature activation of carbonized PET with NaNH 2. Such findings have substantial implications for waste plastic recycling and mitigating the greenhouse effect.
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Under 1 bar adsorption conditions, the material exhibited outstanding CO2 capture performance, attributed to the synergistic effect of narrow micropore confinement and surface polar sites.
“Under 1 bar adsorption conditions, the material exhibited outstanding CO 2 capture performance, attributed to the synergistic effect of narrow micropore confinement and surface polar sites.”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [109]
The resulting porous carbon possessed an ultrahigh specific surface area (>2,200 m2/g), significant micropore volume (0.755 cm3/g), and was rich in nitrogen (1.39 wt%) and oxygen (19.19 wt%) functional groups.
“Characterization revealed that the resulting porous carbon possessed an ultrahigh specific surface area (> 2,200 m 2 /g), significant micropore volume (0.755 cm 3 /g), and was rich in nitrogen (1.39 wt%) and oxygen (19.19 wt%) functional groups.”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [109]
Sodium amide used simultaneously as a nitrogen dopant and low-temperature activating agent optimized the pore structure and significantly boosted the CO2 adsorption capacity of PET-derived porous carbon.
“The introduction of NaNH 2 effectively optimized the pore structure, significantly boosting the material's CO 2 adsorption capacity (Fig. 9a).”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [109]
The adsorption kinetics followed a pseudo-second-order model, and the material combined excellent cycling stability (no capacity decay after five cycles), high CO2/N2 selectivity, and moderate isosteric heat of adsorption.
“The adsorption kinetics followed a pseudo-second-order model, and the material combined excellent cycling stability (no capacity decay after five cycles), high CO 2 /N 2 selectivity, and moderate isosteric heat of adsorption.”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [109]
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References 67 · Cited by 52
- Authors
- Zhou, S., Xu, H., Wang, S., Feng, H., Hu, Y., & Zhang, S.
- Affiliations
- State Key Laboratory of Clean Energy Utilization (CN)
- Jiaxing Nanhu University (CN)
- Zhejiang University of Technology (CN)
- Fudan University (CN)
- Corresponding author
- Wang, Shurong
- Hu, Yanjun
- Venue
- Science of The Total Environment
- Publisher
- Elsevier BV
- Published
- 2024-03
- Volume
- 914
- Pages
- 169856
- ISSN
- 0048-9697 (ISSN-L)
- OpenAlex
- W4390636611
- Cited by
- 52
- References
- 67
- Citations by year
- 2026: 14 · 2025: 25 · 2024: 13
- FWCI
- 6.98
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- The Science of The Total Environment (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Key Research and Development Program of Zhejiang Province (2022C03092)
- China Postdoctoral Science Foundation (2023M733060)
- National Science Fund for Distinguished Young Scholars (51725603)
- State Key Laboratory of Clean Energy Utilization (ZJUCEU2022011)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Mechanical Engineering › Industrial Gas Emission Control
- Keywords
- polyethylene terephthalate, CO2 capture, low-temperature carbonization, waste plastic recycling, microporous carbon, CO2 adsorption kinetics, CO2/N2 selectivity, adsorbent reusability, electrostatic interactions
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