Carbon nanotube production from algal biochar using microwave irradiation technology

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datacite.alternateIdentifier.citationJOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS,Vol.172,2023
datacite.alternateIdentifier.doi10.1016/j.jaap.2023.106017
datacite.creatorHidalgo, Pamela
datacite.creatorNavia, Rodrigo
datacite.creatorHunter, Renato
datacite.creatorCamus, Carolina
datacite.creatorBuschmann, Alejandro
datacite.creatorEcheverria, Ana
datacite.date2023
datacite.subject.englishBiochar
datacite.subject.englishMicroalgae
datacite.subject.englishMacroalgae
datacite.subject.englishCarbon nanotubes
datacite.subject.englishMicrowave irradiation
datacite.titleCarbon nanotube production from algal biochar using microwave irradiation technology
dc.date.accessioned2024-05-27T18:26:09Z
dc.date.available2024-05-27T18:26:09Z
dc.description.abstractIn this study, we evaluated the transformation of algal-based biochar into carbon nanotubes by irradiation in a microwave oven at low energies (100-300 W). Three species of algae (Macrocystis pyrifera, Sarcothalia crispata, and Scenedesmus almeriensis) were selected and pyrolyzed to obtain biochar for carbon nanotubes (CNTs) growth in the presence of ferrocene as the catalyst. The CNTs obtained were characterized by dynamic light scattering, UV-VIS spectroscopy, Raman spectroscopy, transmission electron microscopy, X-ray diffraction, and electrical conductivity. The results indicate that algal biochar can be used for CNT growth. The heterogeneous structure of algal biochar can initiate the graphitization process for the formation of CNTs. The characteristics of synthesized CNTs vary with the biochar source used as a precursor. Thus, both the degree of graphitization of the wall and the content of nanotubes were higher using biochar with higher carbon content (from microalga Scenedesmus almeriensis); otherwise, the hydrodynamic diameter and electrical conductivity were higher using biochar with upper mineral ash content (from microalga Macrocystis pyrifera). Furthermore, it was found that a low catalyst concentration was required to promote growth due to the reactivity of the mineral ash of the biochar, and it was demonstrated that microwave heating conditions, such as microwave power and temperature, lead to variations in the optical properties of CNTs, such as the band gap energy, CNTs content, and measurement of the size such as the hydrodynamic diameter.
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/5711
dc.language.isoen
dc.publisherELSEVIER
dc.sourceJOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
oaire.resourceTypeArticle
uct.indizacionSCI
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