One-step synthesis of magnetic N-doped carbon nanotubes derived from waste plastics for effective Cr(Ⅵ) removal
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The magnetic nitrogen-doped carbon nanotube is prepared by one-pot using waste plastics as feedstock in the existence of the urea and Fe(NO3)3 for Cr(Ⅵ) removal form wastewater. The characterization analysis indicates that the nitrogen is successfully doped on the magnetic nitrogen-doped carbon nanotube with specific surface area of the 158.71 m2/g and saturation magnetization of the 36.47 emu g−1. The existence of the nitrogen group and Fe3C contributes to Cr(Ⅵ) removal by complexation and reduction with adsorption capacity of the 27.47 mg g−1. The adsorption data is fitting well with the Pseudo-second order model, demonstrating chemisorption of Cr(Ⅵ). The Cr(Ⅵ) removal mechanism analysis indicates that Fe0, Fe2+, H*, oxygen-containing group and nitrogen-containing group are crucial to Cr(Ⅵ) removal. The key mechanism of the enhanced Cr (VI) removal is the reductive capacity by dissolved Fe2+, which accounts for 23.6 % of the overall Cr(VI) removal. The magnetic nitrogen-doped carbon nanotube is prepared from waste plastic for Cr (VI) removal from wastewater.
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The presence of nitrogen-containing functional groups and the Fe3C crystalline phase facilitated efficient removal of Cr(VI) through complexation and reduction, achieving a maximum adsorption capacity of 27.47 mg/g.
“The presence of nitrogen-containing functional groups and the Fe 3 C crystalline phase facilitated the efficient removal of Cr(VI) through complexation and reduction, achieving a maximum adsorption capacity of 27.47 mg/g.”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [120]
The Conclusions and §3.5 report a Cr(VI) adsorption capacity of 27.47 mg/g calculated from the Hill model. Section 3.7 links nitrogen functional groups to Cr(VI) binding and reduction, while §3.2 identifies crystalline Fe3C in the material. The paper does not establish that the Fe3C phase itself facilitates removal through complexation or reduction. (LLM, conf=0.87)
Experimental — accuracy not yet measuredThe reduction contribution of dissolved Fe2+ was particularly crucial, accounting for approximately 23.6% of the total Cr(VI) removal.
“Among them, the reduction contribution of dissolved Fe 2+ was particularly crucial, accounting for approximately 23.6% of the total Cr(VI) removal.”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [120]
The resulting MNCNTs possessed a specific surface area of 158.71 m2/g and a saturation magnetization of 36.47 emu/g.
“The resulting MNCNTs possessed a specific surface area of 158.71 m 2 /g, and a saturation magnetization of 36.47 emu/g.”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [120]
Cheng and colleagues prepared magnetic nitrogen-doped carbon nanotubes (MNCNTs) from LDPE, urea, and ferric nitrate for removing Cr(VI) from wastewater.
“Cheng and colleagues employed a one-pot synthesis strategy using LDPE as the carbon source, urea as the nitrogen source, and ferric nitrate (Fe(NO 3 ) 3 ) as the iron source and magnetic precursor [120] .They successfully prepared magnetic nitrogen-doped carbon nanotubes (MNCNTs) for removing Cr(VI) from wastewater.”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [120]
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References 54 · Cited by 73
- Authors
- Cheng, S., Zeng, X., & Liu, P.
- Affiliations
- Henan Polytechnic University (CN)
- Panzhihua University (CN)
- Corresponding author
- Liu, Peng
- Venue
- Arabian Journal of Chemistry
- Publisher
- Scientific Scholar
- Published
- 2024-10
- Volume
- 17
- Issue
- 10
- Pages
- 105956
- ISSN
- 1878-5352 (ISSN-L)
- OpenAlex
- W4401479556
- Cited by
- 73
- References
- 54
- Citations by year
- 2026: 16 · 2025: 50 · 2024: 7
- FWCI
- 8.41
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Arabian Journal of Chemistry (publishedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Chromium effects and bioremediation
- Keywords
- hexavalent chromium removal, plastic waste valorization, adsorption, reductive removal, cementite, chemisorption, wastewater treatment, one-pot synthesis, pseudo-second-order kinetics, adsorption mechanism
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