Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products

Abstract A novel and simple flotation technique has been developed to prepare high-purity graphite from impure graphite. In this method, a suspension of pristine powdered graphite (PG) is dispersed and stirred in water without adding froth formers or supportive chemicals. This makes fine particles o...

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Autores principales:	Gamaralalage R. A. Kumara, Herath Mudiyanselage G. T. A. Pitawala, Buddika Karunarathne, Mantilaka Mudiyanselage M. G. P. G. Mantilaka, Rajapakse Mudiyanselage G. Rajapakse, Hsin-Hui Huang, K. Kanishka H. De Silva, Masamichi Yoshimura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0eeb91dbbca74890ad62fadb515cf8f6
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spelling	oai:doaj.org-article:0eeb91dbbca74890ad62fadb515cf8f62021-11-28T12:15:56ZDevelopment of a chemical-free floatation technology for the purification of vein graphite and characterization of the products10.1038/s41598-021-02101-92045-2322https://doaj.org/article/0eeb91dbbca74890ad62fadb515cf8f62021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02101-9https://doaj.org/toc/2045-2322Abstract A novel and simple flotation technique has been developed to prepare high-purity graphite from impure graphite. In this method, a suspension of pristine powdered graphite (PG) is dispersed and stirred in water without adding froth formers or supportive chemicals. This makes fine particles of graphite move upwards and float on water. X-ray diffraction (XRD) analysis reveals that the floated graphite (FG) has a lower c-axis parameter, indicating the removal of interlayer impurities. A notable increase in the intensity ratio of the D band to G band in the Raman spectra indicates that the FG has more edge defects due to their smaller crystallite sizes. Transmission electron microscopic (TEM) analysis shows the number of layers in FG has been reduced to 16 from 68 in PG. The absence of C=O vibration of Fourier Transformed Infrared (FT-IR) spectroscopy in treated and untreated samples suggests that their layers are not significantly oxidized. However, X-ray photoelectron spectroscopic (XPS) analysis shows the presence of C–O–C ether functionalities, possibly on edge planes. Further, the product has higher purity with increased carbon content. Therefore, the technique is helpful for the value enhancement of graphite, the reduction of the chemical cost of the conventional techniques, environmental friendliness, and improvement of its applications.Gamaralalage R. A. KumaraHerath Mudiyanselage G. T. A. PitawalaBuddika KarunarathneMantilaka Mudiyanselage M. G. P. G. MantilakaRajapakse Mudiyanselage G. RajapakseHsin-Hui HuangK. Kanishka H. De SilvaMasamichi YoshimuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gamaralalage R. A. Kumara Herath Mudiyanselage G. T. A. Pitawala Buddika Karunarathne Mantilaka Mudiyanselage M. G. P. G. Mantilaka Rajapakse Mudiyanselage G. Rajapakse Hsin-Hui Huang K. Kanishka H. De Silva Masamichi Yoshimura Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products
description	Abstract A novel and simple flotation technique has been developed to prepare high-purity graphite from impure graphite. In this method, a suspension of pristine powdered graphite (PG) is dispersed and stirred in water without adding froth formers or supportive chemicals. This makes fine particles of graphite move upwards and float on water. X-ray diffraction (XRD) analysis reveals that the floated graphite (FG) has a lower c-axis parameter, indicating the removal of interlayer impurities. A notable increase in the intensity ratio of the D band to G band in the Raman spectra indicates that the FG has more edge defects due to their smaller crystallite sizes. Transmission electron microscopic (TEM) analysis shows the number of layers in FG has been reduced to 16 from 68 in PG. The absence of C=O vibration of Fourier Transformed Infrared (FT-IR) spectroscopy in treated and untreated samples suggests that their layers are not significantly oxidized. However, X-ray photoelectron spectroscopic (XPS) analysis shows the presence of C–O–C ether functionalities, possibly on edge planes. Further, the product has higher purity with increased carbon content. Therefore, the technique is helpful for the value enhancement of graphite, the reduction of the chemical cost of the conventional techniques, environmental friendliness, and improvement of its applications.
format	article
author	Gamaralalage R. A. Kumara Herath Mudiyanselage G. T. A. Pitawala Buddika Karunarathne Mantilaka Mudiyanselage M. G. P. G. Mantilaka Rajapakse Mudiyanselage G. Rajapakse Hsin-Hui Huang K. Kanishka H. De Silva Masamichi Yoshimura
author_facet	Gamaralalage R. A. Kumara Herath Mudiyanselage G. T. A. Pitawala Buddika Karunarathne Mantilaka Mudiyanselage M. G. P. G. Mantilaka Rajapakse Mudiyanselage G. Rajapakse Hsin-Hui Huang K. Kanishka H. De Silva Masamichi Yoshimura
author_sort	Gamaralalage R. A. Kumara
title	Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products
title_short	Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products
title_full	Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products
title_fullStr	Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products
title_full_unstemmed	Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products
title_sort	development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0eeb91dbbca74890ad62fadb515cf8f6
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Development of a chemical-free floatation technology for the purification of vein graphite and characterization of the products

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