Modified hydrothermal route for synthesis of photoactive anatase tio<inf>2</inf> /g-cn nanotubes from sludge generated tio<inf>2</inf>

Hossain, SM; Park, H; Kang, HJ; Mun, JS; Tijing, L; Rhee, I; Kim, JH; Jun, YS; Shon, HK

Modified hydrothermal route for synthesis of photoactive anatase tio<inf>2</inf> /g-cn nanotubes from sludge generated tio<inf>2</inf>

Hossain, SM Park, H Kang, HJ Mun, JS Tijing, L

Rhee, I Kim, JH Jun, YS Shon, HK

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Publisher:: MDPI
Publication Type:: Journal Article
Citation:: Catalysts, 2020, 10, (11), pp. 1-19
Issue Date:: 2020-11-01

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Field	Value	Language
dc.contributor.author	Hossain, SM
dc.contributor.author	Park, H
dc.contributor.author	Kang, HJ
dc.contributor.author	Mun, JS
dc.contributor.author	Tijing, L https://orcid.org/0000-0001-9398-6355
dc.contributor.author	Rhee, I
dc.contributor.author	Kim, JH
dc.contributor.author	Jun, YS
dc.contributor.author	Shon, HK
dc.date.accessioned	2021-03-07T19:19:21Z
dc.date.available	2021-03-07T19:19:21Z
dc.date.issued	2020-11-01
dc.identifier.citation	Catalysts, 2020, 10, (11), pp. 1-19
dc.identifier.issn	2073-4344
dc.identifier.issn	2073-4344
dc.identifier.uri	http://hdl.handle.net/10453/146859
dc.description.abstract	© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Titania nanotube was prepared from sludge generated TiO2 (S-TNT) through a modified hydrothermal route and successfully composited with graphitic carbon nitride (g-CN) through a simple calcination step. Advanced characterization techniques such as X-ray diffraction, scanning and transmission electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, UV/visible diffuse reflectance spectroscopy, and photoluminescence analysis were utilized to characterize the prepared samples. A significant improvement in morphological and optical bandgap was observed. The effective surface area of the prepared composite increased threefold compared with sludge generated TiO2 . The optical bandgap was narrowed to 3.00 eV from 3.18 in the pristine sludge generated TiO2 nanotubes. The extent of photoactivity of the prepared composites was investigated through photooxidation of NOx in a continuous flow reactor. Because of extended light absorption of the as-prepared composite, under visible light, 19.62% of NO removal was observed. On the other hand, under UV irradiation, owing to bandgap narrowing, although the light absorption was compromised, the impact on photoactivity was compensated by the increased effective surface area of 153.61 m2 /g. Hence, under UV irradiance, the maximum NO removal was attained as 32.44% after 1 h of light irradiation. The proposed facile method in this study for the heterojunction of S-TNT and g-CN could significantly contribute to resource recovery from water treatment plants and photocatalytic atmospheric pollutant removal.
dc.language	English
dc.publisher	MDPI
dc.relation.ispartof	Catalysts
dc.relation.isbasedon	10.3390/catal10111350
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0306 Physical Chemistry (incl. Structural)
dc.title	Modified hydrothermal route for synthesis of photoactive anatase tio<inf>2</inf> /g-cn nanotubes from sludge generated tio<inf>2</inf>
dc.type	Journal Article
utslib.citation.volume	10
utslib.for	0904 Chemical Engineering
utslib.for	0306 Physical Chemistry (incl. Structural)
utslib.for	0306 Physical Chemistry (incl. Structural)
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access	*
dc.date.updated	2021-03-07T19:19:15Z
pubs.issue	11
pubs.publication-status	Published
pubs.volume	10
utslib.citation.issue	11

Abstract:

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Titania nanotube was prepared from sludge generated TiO2 (S-TNT) through a modified hydrothermal route and successfully composited with graphitic carbon nitride (g-CN) through a simple calcination step. Advanced characterization techniques such as X-ray diffraction, scanning and transmission electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, UV/visible diffuse reflectance spectroscopy, and photoluminescence analysis were utilized to characterize the prepared samples. A significant improvement in morphological and optical bandgap was observed. The effective surface area of the prepared composite increased threefold compared with sludge generated TiO2 . The optical bandgap was narrowed to 3.00 eV from 3.18 in the pristine sludge generated TiO2 nanotubes. The extent of photoactivity of the prepared composites was investigated through photooxidation of NOx in a continuous flow reactor. Because of extended light absorption of the as-prepared composite, under visible light, 19.62% of NO removal was observed. On the other hand, under UV irradiation, owing to bandgap narrowing, although the light absorption was compromised, the impact on photoactivity was compensated by the increased effective surface area of 153.61 m2 /g. Hence, under UV irradiance, the maximum NO removal was attained as 32.44% after 1 h of light irradiation. The proposed facile method in this study for the heterojunction of S-TNT and g-CN could significantly contribute to resource recovery from water treatment plants and photocatalytic atmospheric pollutant removal.

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