Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance

The effects of Fe2+ and Fe3+ as TiO2 cocatalysts were studied, and the experimental results showed that Fe3+ was more efficient than Fe2+, which needed an intermediate reaction to produce hydroxyl radicals. TiO2 was modified with the aim of improving its structural, optical, and adsorption propertie...

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Autores principales:	Rafik Melki, Nadia Aïcha Laoufi, Abdelkader Mouheb
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	cocatalyst iron ions solar energy tio2 doping tio2 nanotubes Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/370736d61d9e4043a19b26ba3f1420cd
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spelling	oai:doaj.org-article:370736d61d9e4043a19b26ba3f1420cd2021-11-06T11:09:54ZEffects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance0273-12231996-973210.2166/wst.2021.182https://doaj.org/article/370736d61d9e4043a19b26ba3f1420cd2021-06-01T00:00:00Zhttp://wst.iwaponline.com/content/83/12/3020https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732The effects of Fe2+ and Fe3+ as TiO2 cocatalysts were studied, and the experimental results showed that Fe3+ was more efficient than Fe2+, which needed an intermediate reaction to produce hydroxyl radicals. TiO2 was modified with the aim of improving its structural, optical, and adsorption properties, thus improving its photocatalytic performance. The light range of the catalyst activation process was expanded, which increased the catalyst's ability to absorb visible light. Consequently, this study exploits solar energy in photocatalysis by Fe ion doping using different methods, including impregnation, photodeposition, solvothermal doping, and hydrothermal doping, and evaluates the influence of each doping method on TiO2 optical properties and photocatalytic activity. Enhancing the catalyst adsorption capacity by morphologically modifying TiO2 nanoparticles into nanotubes using the hydrothermal method increases the catalyst surface area from 55 to 294 m2/g, as shown in the SEM and BET results. The effect of combining morphological changes and Fe3+ doping on TiO2 activity was evaluated. We observed a reduction in the TiO2 band gap from 3.29 to 3.01 eV, absorption edge widening, and an increase in the specific surface area up to 279 m2/g; thus, the synthesized catalyst eliminated Cefixime in 120 min. HIGHLIGHTS The iron ion photocatalytic degradation mechanism is studied.; TiO2 nanotubes with high photocatalytic activity are explained.; Hydrothermal doping improves TiO2 structural, optical and physical properties.; A comparative study of four different Fe3+/TiO2 doping methods is performed.; Fe3+ use as a cocatalyst may, in some cases, be more efficient than its use as a dopant.;Rafik MelkiNadia Aïcha LaoufiAbdelkader MouhebIWA Publishingarticlecocatalystiron ionssolar energytio2 dopingtio2 nanotubesEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 12, Pp 3020-3032 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cocatalyst iron ions solar energy tio2 doping tio2 nanotubes Environmental technology. Sanitary engineering TD1-1066
spellingShingle	cocatalyst iron ions solar energy tio2 doping tio2 nanotubes Environmental technology. Sanitary engineering TD1-1066 Rafik Melki Nadia Aïcha Laoufi Abdelkader Mouheb Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance
description	The effects of Fe2+ and Fe3+ as TiO2 cocatalysts were studied, and the experimental results showed that Fe3+ was more efficient than Fe2+, which needed an intermediate reaction to produce hydroxyl radicals. TiO2 was modified with the aim of improving its structural, optical, and adsorption properties, thus improving its photocatalytic performance. The light range of the catalyst activation process was expanded, which increased the catalyst's ability to absorb visible light. Consequently, this study exploits solar energy in photocatalysis by Fe ion doping using different methods, including impregnation, photodeposition, solvothermal doping, and hydrothermal doping, and evaluates the influence of each doping method on TiO2 optical properties and photocatalytic activity. Enhancing the catalyst adsorption capacity by morphologically modifying TiO2 nanoparticles into nanotubes using the hydrothermal method increases the catalyst surface area from 55 to 294 m2/g, as shown in the SEM and BET results. The effect of combining morphological changes and Fe3+ doping on TiO2 activity was evaluated. We observed a reduction in the TiO2 band gap from 3.29 to 3.01 eV, absorption edge widening, and an increase in the specific surface area up to 279 m2/g; thus, the synthesized catalyst eliminated Cefixime in 120 min. HIGHLIGHTS The iron ion photocatalytic degradation mechanism is studied.; TiO2 nanotubes with high photocatalytic activity are explained.; Hydrothermal doping improves TiO2 structural, optical and physical properties.; A comparative study of four different Fe3+/TiO2 doping methods is performed.; Fe3+ use as a cocatalyst may, in some cases, be more efficient than its use as a dopant.;
format	article
author	Rafik Melki Nadia Aïcha Laoufi Abdelkader Mouheb
author_facet	Rafik Melki Nadia Aïcha Laoufi Abdelkader Mouheb
author_sort	Rafik Melki
title	Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance
title_short	Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance
title_full	Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance
title_fullStr	Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance
title_full_unstemmed	Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance
title_sort	effects of iron ions, doping methods and nanotubular morphology on tio2 solar photocatalytic performance
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/370736d61d9e4043a19b26ba3f1420cd
work_keys_str_mv	AT rafikmelki effectsofironionsdopingmethodsandnanotubularmorphologyontio2solarphotocatalyticperformance AT nadiaaichalaoufi effectsofironionsdopingmethodsandnanotubularmorphologyontio2solarphotocatalyticperformance AT abdelkadermouheb effectsofironionsdopingmethodsandnanotubularmorphologyontio2solarphotocatalyticperformance
_version_	1718443723492163584

Effects of iron ions, doping methods and nanotubular morphology on TiO2 solar photocatalytic performance

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