Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes

Maziar Bahreini,1 Monireh Movahedi,2 Maryam Peyvandi,3 Fereshteh Nematollahi,4 Hessam Sepasi Tehrani21Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran; 2Department of Cellular and Molecular, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad Universi...

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Autores principales:	Bahreini M, Movahedi M, Peyvandi M, Nematollahi F, Sepasi Tehrani H
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2019
Materias:	Nanozyme Carbon nanofibers 4-AAP Medical technology R855-855.5 Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/37ec26d4657d4ea885305e484a53c4ba
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spelling	oai:doaj.org-article:37ec26d4657d4ea885305e484a53c4ba2021-12-02T07:02:39ZThermodynamics and kinetic analysis of carbon nanofibers as nanozymes1177-8903https://doaj.org/article/37ec26d4657d4ea885305e484a53c4ba2019-07-01T00:00:00Zhttps://www.dovepress.com/thermodynamics-and-kinetic-analysis-of-carbon-nanofibers-as-nanozymes-peer-reviewed-article-NSAhttps://doaj.org/toc/1177-8903Maziar Bahreini,1 Monireh Movahedi,2 Maryam Peyvandi,3 Fereshteh Nematollahi,4 Hessam Sepasi Tehrani21Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran; 2Department of Cellular and Molecular, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran; 3Department of Biology, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran; 4Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, IranPurpose: Evaluation of structural features, thermodynamics and kinetic properties of carbon nanofibers (CNFs) as artificial nanoscale enzymes (nanozyme).Methods: Synthesis of CNFs was done using chemical vapor deposition, and transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and energy-dispersive x-ray spectroscopy (EDX) were used to provide information on the morphology, elemental monitoring and impurity assay of the CNFs. The thermal features of the CNFs were evaluated using differential thermal analysis (DTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) derivative and TGA. The calculated thermo-physical parameters were melting temperature (Tm), weight loss maximum temperature (Tmax) and enthalpy of fusion (ΔHfusion). Catalytic activity was assayed by a 4-aminoantypyrine (4-AAP)-H2O2 coupled colorimetric system by UV-visible spectroscopy.Results: FE-SEM and TEM analysis demonstrated parallel graphitic layers and uniformity of atomic orientation and morphology. The EDX spectra approved carbon element as major signal and presence of partial Ti as impurities of CNFs during CVD process. The DTA thermogram showed the endothermic process had a maximum temperature of 82.27°C at −15.48 mV and that thermal decomposition occurred at about 200°C. The TGA-differential gravimetric analysis thermogram showed that Tmax was 700°C. The DSC heat flow curve showed a melting temperature (Tm) of 254.52°C, ΔHfusion of 3.84 J^.g−1, area under the curve of 58.58 mJ and Te (onset) and Tf (end set) temperatures of 246.60°C and 285.67°C, respectively. The peroxidase activity of the CNFs obeyed the Michaelis–Menten equation with a double-reciprocal curve and the calculated Km, Kcat and Vmax kinetic parameters.Conclusion: CNFs as peroxidase nanozymes are intrinsically strong and stable nanocatalysts under difficult thermal conditions. The peroxidase activity was demonstrated, making these CNFs candidates for analytical tools under extreme conditions.Keywords: nanozyme, carbon nanofibers, 4-AAPBahreini MMovahedi MPeyvandi MNematollahi FSepasi Tehrani HDove Medical PressarticleNanozymeCarbon nanofibers4-AAPMedical technologyR855-855.5Chemical technologyTP1-1185ENNanotechnology, Science and Applications, Vol Volume 12, Pp 3-10 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Nanozyme Carbon nanofibers 4-AAP Medical technology R855-855.5 Chemical technology TP1-1185
spellingShingle	Nanozyme Carbon nanofibers 4-AAP Medical technology R855-855.5 Chemical technology TP1-1185 Bahreini M Movahedi M Peyvandi M Nematollahi F Sepasi Tehrani H Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes
description	Maziar Bahreini,1 Monireh Movahedi,2 Maryam Peyvandi,3 Fereshteh Nematollahi,4 Hessam Sepasi Tehrani21Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran; 2Department of Cellular and Molecular, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran; 3Department of Biology, Faculty of Biological Sciences, North Tehran Branch, Islamic Azad University, Tehran, Iran; 4Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, IranPurpose: Evaluation of structural features, thermodynamics and kinetic properties of carbon nanofibers (CNFs) as artificial nanoscale enzymes (nanozyme).Methods: Synthesis of CNFs was done using chemical vapor deposition, and transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and energy-dispersive x-ray spectroscopy (EDX) were used to provide information on the morphology, elemental monitoring and impurity assay of the CNFs. The thermal features of the CNFs were evaluated using differential thermal analysis (DTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) derivative and TGA. The calculated thermo-physical parameters were melting temperature (Tm), weight loss maximum temperature (Tmax) and enthalpy of fusion (ΔHfusion). Catalytic activity was assayed by a 4-aminoantypyrine (4-AAP)-H2O2 coupled colorimetric system by UV-visible spectroscopy.Results: FE-SEM and TEM analysis demonstrated parallel graphitic layers and uniformity of atomic orientation and morphology. The EDX spectra approved carbon element as major signal and presence of partial Ti as impurities of CNFs during CVD process. The DTA thermogram showed the endothermic process had a maximum temperature of 82.27°C at −15.48 mV and that thermal decomposition occurred at about 200°C. The TGA-differential gravimetric analysis thermogram showed that Tmax was 700°C. The DSC heat flow curve showed a melting temperature (Tm) of 254.52°C, ΔHfusion of 3.84 J^.g−1, area under the curve of 58.58 mJ and Te (onset) and Tf (end set) temperatures of 246.60°C and 285.67°C, respectively. The peroxidase activity of the CNFs obeyed the Michaelis–Menten equation with a double-reciprocal curve and the calculated Km, Kcat and Vmax kinetic parameters.Conclusion: CNFs as peroxidase nanozymes are intrinsically strong and stable nanocatalysts under difficult thermal conditions. The peroxidase activity was demonstrated, making these CNFs candidates for analytical tools under extreme conditions.Keywords: nanozyme, carbon nanofibers, 4-AAP
format	article
author	Bahreini M Movahedi M Peyvandi M Nematollahi F Sepasi Tehrani H
author_facet	Bahreini M Movahedi M Peyvandi M Nematollahi F Sepasi Tehrani H
author_sort	Bahreini M
title	Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes
title_short	Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes
title_full	Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes
title_fullStr	Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes
title_full_unstemmed	Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes
title_sort	thermodynamics and kinetic analysis of carbon nanofibers as nanozymes
publisher	Dove Medical Press
publishDate	2019
url	https://doaj.org/article/37ec26d4657d4ea885305e484a53c4ba
work_keys_str_mv	AT bahreinim thermodynamicsandkineticanalysisofcarbonnanofibersasnanozymes AT movahedim thermodynamicsandkineticanalysisofcarbonnanofibersasnanozymes AT peyvandim thermodynamicsandkineticanalysisofcarbonnanofibersasnanozymes AT nematollahif thermodynamicsandkineticanalysisofcarbonnanofibersasnanozymes AT sepasitehranih thermodynamicsandkineticanalysisofcarbonnanofibersasnanozymes
_version_	1718399625784721408

Thermodynamics and kinetic analysis of carbon nanofibers as nanozymes

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