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Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures

Titanium dioxide–carbon sphere (TiO(2)–CS) composites were constructed via using prefabricated carbon spheres as templates. By the removal of template from the TiO(2)–CS, TiO(2) hollow structures (HS) were synthesized. The CS templates were prepared by the hydrothermal treatment of ordinary table su...

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Autores principales: Gyulavári, Tamás, Veréb, Gábor, Pap, Zsolt, Réti, Balázs, Baan, Kornelia, Todea, Milica, Magyari, Klára, Szilágyi, Imre Miklós, Hernadi, Klara
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6720943/
https://www.ncbi.nlm.nih.gov/pubmed/31395835
http://dx.doi.org/10.3390/ma12162537
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author Gyulavári, Tamás
Veréb, Gábor
Pap, Zsolt
Réti, Balázs
Baan, Kornelia
Todea, Milica
Magyari, Klára
Szilágyi, Imre Miklós
Hernadi, Klara
author_facet Gyulavári, Tamás
Veréb, Gábor
Pap, Zsolt
Réti, Balázs
Baan, Kornelia
Todea, Milica
Magyari, Klára
Szilágyi, Imre Miklós
Hernadi, Klara
author_sort Gyulavári, Tamás
collection PubMed
description Titanium dioxide–carbon sphere (TiO(2)–CS) composites were constructed via using prefabricated carbon spheres as templates. By the removal of template from the TiO(2)–CS, TiO(2) hollow structures (HS) were synthesized. The CS templates were prepared by the hydrothermal treatment of ordinary table sugar (sucrose). TiO(2)–HSs were obtained by removing CSs with calcination. Our own sensitized TiO(2) was used for coating the CSs. The structure of the CSs, TiO(2)–CS composites, and TiO(2)–HSs were characterized by scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS). The effect of various synthesis parameters (purification method of CSs, precursor quantity, and applied furnace) on the morphology was investigated. The photocatalytic activity was investigated by phenol model pollutant degradation under visible light irradiation (λ > 400 nm). It was established that the composite samples possess lower crystallinity and photocatalytic activity compared to TiO(2) hollow structures. Based on XPS measurements, the carbon content on the surface of the TiO(2)–HS exerts an adverse effect on the photocatalytic performance. The synthesis parameters were optimized and the TiO(2)–HS specimen having the best absolute and surface normalized photocatalytic efficiency was identified. The superior properties were explained in terms of its unique morphology and surface properties. The stability of this TiO(2)–HS was investigated via XRD and SEM measurements after three consecutive phenol degradation tests, and it was found to be highly stable as it entirely retained its crystal phase composition, morphology and photocatalytic activity.
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spelling pubmed-67209432019-09-10 Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures Gyulavári, Tamás Veréb, Gábor Pap, Zsolt Réti, Balázs Baan, Kornelia Todea, Milica Magyari, Klára Szilágyi, Imre Miklós Hernadi, Klara Materials (Basel) Article Titanium dioxide–carbon sphere (TiO(2)–CS) composites were constructed via using prefabricated carbon spheres as templates. By the removal of template from the TiO(2)–CS, TiO(2) hollow structures (HS) were synthesized. The CS templates were prepared by the hydrothermal treatment of ordinary table sugar (sucrose). TiO(2)–HSs were obtained by removing CSs with calcination. Our own sensitized TiO(2) was used for coating the CSs. The structure of the CSs, TiO(2)–CS composites, and TiO(2)–HSs were characterized by scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS). The effect of various synthesis parameters (purification method of CSs, precursor quantity, and applied furnace) on the morphology was investigated. The photocatalytic activity was investigated by phenol model pollutant degradation under visible light irradiation (λ > 400 nm). It was established that the composite samples possess lower crystallinity and photocatalytic activity compared to TiO(2) hollow structures. Based on XPS measurements, the carbon content on the surface of the TiO(2)–HS exerts an adverse effect on the photocatalytic performance. The synthesis parameters were optimized and the TiO(2)–HS specimen having the best absolute and surface normalized photocatalytic efficiency was identified. The superior properties were explained in terms of its unique morphology and surface properties. The stability of this TiO(2)–HS was investigated via XRD and SEM measurements after three consecutive phenol degradation tests, and it was found to be highly stable as it entirely retained its crystal phase composition, morphology and photocatalytic activity. MDPI 2019-08-09 /pmc/articles/PMC6720943/ /pubmed/31395835 http://dx.doi.org/10.3390/ma12162537 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gyulavári, Tamás
Veréb, Gábor
Pap, Zsolt
Réti, Balázs
Baan, Kornelia
Todea, Milica
Magyari, Klára
Szilágyi, Imre Miklós
Hernadi, Klara
Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures
title Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures
title_full Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures
title_fullStr Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures
title_full_unstemmed Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures
title_short Utilization of Carbon Nanospheres in Photocatalyst Production: From Composites to Highly Active Hollow Structures
title_sort utilization of carbon nanospheres in photocatalyst production: from composites to highly active hollow structures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6720943/
https://www.ncbi.nlm.nih.gov/pubmed/31395835
http://dx.doi.org/10.3390/ma12162537
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