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Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine

Nowadays, N-functionalized carbon nanomaterials attract a growing interest. The use of melamine as a functionalizing agent looks prospective from environmental and cost points of view. Moreover, the melamine molecule contains a high amount of nitrogen with an atomic ratio C/N of 1/2. In present work...

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Autores principales: Maksimova, Tatyana A., Mishakov, Ilya V., Bauman, Yury I., Ayupov, Artem B., Mel’gunov, Maksim S., Dmitrachkov, Aleksey M., Nartova, Anna V., Stoyanovskii, Vladimir O., Vedyagin, Aleksey A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9693401/
https://www.ncbi.nlm.nih.gov/pubmed/36431724
http://dx.doi.org/10.3390/ma15228239
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author Maksimova, Tatyana A.
Mishakov, Ilya V.
Bauman, Yury I.
Ayupov, Artem B.
Mel’gunov, Maksim S.
Dmitrachkov, Aleksey M.
Nartova, Anna V.
Stoyanovskii, Vladimir O.
Vedyagin, Aleksey A.
author_facet Maksimova, Tatyana A.
Mishakov, Ilya V.
Bauman, Yury I.
Ayupov, Artem B.
Mel’gunov, Maksim S.
Dmitrachkov, Aleksey M.
Nartova, Anna V.
Stoyanovskii, Vladimir O.
Vedyagin, Aleksey A.
author_sort Maksimova, Tatyana A.
collection PubMed
description Nowadays, N-functionalized carbon nanomaterials attract a growing interest. The use of melamine as a functionalizing agent looks prospective from environmental and cost points of view. Moreover, the melamine molecule contains a high amount of nitrogen with an atomic ratio C/N of 1/2. In present work, the initial carbon nanofibers (CNFs) were synthesized via catalytic pyrolysis of ethylene over microdispersed Ni–Cu alloy. The CNF materials were pretreated with 12% hydrochloric acid or with a mixture of concentrated nitric and sulfuric acids, which allowed etching of the metals from the fibers and oxidizing of the fibers’ surface. Finally, the CNFs were N-functionalized via their impregnation with a melamine solution and thermolysis in an inert atmosphere. According to the microscopic data, the initial structure of the CNFs remained the same after the pretreatment and post-functionalization procedures. At the same time, the surface of the N-functionalized CNFs became more defective. The textural properties of the materials were also affected. In the case of the oxidative treatment with a mixture of acids, the highest content of the surface oxygen of 11.8% was registered by X-ray photoelectron spectroscopy. The amount of nitrogen introduced during the post-functionalization of CNFs with melamine increased from 1.4 to 4.3%. Along with this, the surface oxygen concentration diminished to 6.4%.
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spelling pubmed-96934012022-11-26 Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine Maksimova, Tatyana A. Mishakov, Ilya V. Bauman, Yury I. Ayupov, Artem B. Mel’gunov, Maksim S. Dmitrachkov, Aleksey M. Nartova, Anna V. Stoyanovskii, Vladimir O. Vedyagin, Aleksey A. Materials (Basel) Article Nowadays, N-functionalized carbon nanomaterials attract a growing interest. The use of melamine as a functionalizing agent looks prospective from environmental and cost points of view. Moreover, the melamine molecule contains a high amount of nitrogen with an atomic ratio C/N of 1/2. In present work, the initial carbon nanofibers (CNFs) were synthesized via catalytic pyrolysis of ethylene over microdispersed Ni–Cu alloy. The CNF materials were pretreated with 12% hydrochloric acid or with a mixture of concentrated nitric and sulfuric acids, which allowed etching of the metals from the fibers and oxidizing of the fibers’ surface. Finally, the CNFs were N-functionalized via their impregnation with a melamine solution and thermolysis in an inert atmosphere. According to the microscopic data, the initial structure of the CNFs remained the same after the pretreatment and post-functionalization procedures. At the same time, the surface of the N-functionalized CNFs became more defective. The textural properties of the materials were also affected. In the case of the oxidative treatment with a mixture of acids, the highest content of the surface oxygen of 11.8% was registered by X-ray photoelectron spectroscopy. The amount of nitrogen introduced during the post-functionalization of CNFs with melamine increased from 1.4 to 4.3%. Along with this, the surface oxygen concentration diminished to 6.4%. MDPI 2022-11-20 /pmc/articles/PMC9693401/ /pubmed/36431724 http://dx.doi.org/10.3390/ma15228239 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Maksimova, Tatyana A.
Mishakov, Ilya V.
Bauman, Yury I.
Ayupov, Artem B.
Mel’gunov, Maksim S.
Dmitrachkov, Aleksey M.
Nartova, Anna V.
Stoyanovskii, Vladimir O.
Vedyagin, Aleksey A.
Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine
title Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine
title_full Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine
title_fullStr Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine
title_full_unstemmed Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine
title_short Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine
title_sort effect of pretreatment with acids on the n-functionalization of carbon nanofibers using melamine
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9693401/
https://www.ncbi.nlm.nih.gov/pubmed/36431724
http://dx.doi.org/10.3390/ma15228239
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