Carbon nanotube production from algal biochar using microwave irradiation technology
Date
Authors
HIDALGO OPORTO, PAMELA
Hidalgo, Pamela
Navia, Rodrigo
Hunter, Renato A.
Camus, Carolina
Buschmann, Alejandro H.
Echeverría, Ana
Hidalgo, Pamela
Navia, Rodrigo
Hunter, Renato A.
Camus, Carolina
Buschmann, Alejandro H.
Echeverría, Ana
Authors
Date
Datos de publicación:
10.1016/j.jaap.2023.106017
Keywords
Biochar - Carbon Nanotubes - Macroalgae - Microalgae - Microwave Irradiation - Carbon Nanotubes - Catalysts - Electric Conductivity - Energy Gap - Graphite - Graphitization - High Resolution Transmission Electron Microscopy - Iron Compounds - Irradiation - Microwave Irradiation - Optical Properties - Organometallics - Biochar - Carbon Nanotube Growth - Electrical Conductivity - Hydrodynamic Diameter - Macro-algae - Micro-algae - Microalga - Microwave- Irradiations - Mineral Ash - Scenedesmus - Microalgae
Collections
Abstract
In 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. © 2023 Elsevier B.V., All rights reserved.
Description
Keywords
Biochar , Carbon Nanotubes , Macroalgae , Microalgae , Microwave Irradiation , Carbon Nanotubes , Catalysts , Electric Conductivity , Energy Gap , Graphite , Graphitization , High Resolution Transmission Electron Microscopy , Iron Compounds , Irradiation , Microwave Irradiation , Optical Properties , Organometallics , Biochar , Carbon Nanotube Growth , Electrical Conductivity , Hydrodynamic Diameter , Macro-algae , Micro-algae , Microalga , Microwave- Irradiations , Mineral Ash , Scenedesmus , Microalgae
Citation
10.1016/j.jaap.2023.106017