Photocatalytic Properties of a Novel Keratin char-TiO2 Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO2 Precursors

In this study, the photocatalytic properties of novel keratin char-TiO2 composite films, made through the calcination of wool keratin coatings containing TiO2 precursors at 400 °C, were investigated for the photodegradation of organic contaminants under...

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Autores principales:	Jinyuan Zhang, Hui Zhang, Wenjun Li, Limeng Yang, Hailiang Wu, Ningtao Mao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	wool keratin char-TiO<sub>2</sub> composite film photocatalytic Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/e4292cec3ec3470aa26c6c1c53f45917
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spelling	oai:doaj.org-article:e4292cec3ec3470aa26c6c1c53f459172021-11-25T17:06:23ZPhotocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors10.3390/catal111113662073-4344https://doaj.org/article/e4292cec3ec3470aa26c6c1c53f459172021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1366https://doaj.org/toc/2073-4344In this study, the photocatalytic properties of novel keratin char-TiO<sub>2</sub> composite films, made through the calcination of wool keratin coatings containing TiO<sub>2</sub> precursors at 400 °C, were investigated for the photodegradation of organic contaminants under visible light irradiation. Its structural characteristics and photocatalytic performance were systematically examined. It was shown that a self-cleaning hydrophobic keratin char-TiO<sub>2</sub> composite film containing meso- and micro-pores was formed after the keratin—TiO<sub>2</sub> precursors coating was calcined. In comparison with calcinated TiO<sub>2</sub> films, the keratin char-TiO<sub>2</sub> composite films doped with the elements of C, N, and S from keratins resulted in decreased crystallinity and a larger water contact angle. The bandgap of the char-TiO<sub>2</sub> composite films increased slightly from 3.26 to 3.32 eV, and its separation of photogenerated charge carriers was inhibited to a certain degree. However, it exhibited higher photodegradation efficiency to methyl blue (MB) effluents than the pure calcinated TiO<sub>2</sub> films. This was mainly because of its special porous structure, large water contact angle, and high adsorption energy towards organic pollutants, confirmed by the density functional theory calculations. The main active species were <sup>1</sup>O<sub>2</sub> radicals in the MB photodegradation process.Jinyuan ZhangHui ZhangWenjun LiLimeng YangHailiang WuNingtao MaoMDPI AGarticlewool keratinchar-TiO<sub>2</sub>composite filmphotocatalyticChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1366, p 1366 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	wool keratin char-TiO<sub>2</sub> composite film photocatalytic Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	wool keratin char-TiO<sub>2</sub> composite film photocatalytic Chemical technology TP1-1185 Chemistry QD1-999 Jinyuan Zhang Hui Zhang Wenjun Li Limeng Yang Hailiang Wu Ningtao Mao Photocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors
description	In this study, the photocatalytic properties of novel keratin char-TiO<sub>2</sub> composite films, made through the calcination of wool keratin coatings containing TiO<sub>2</sub> precursors at 400 °C, were investigated for the photodegradation of organic contaminants under visible light irradiation. Its structural characteristics and photocatalytic performance were systematically examined. It was shown that a self-cleaning hydrophobic keratin char-TiO<sub>2</sub> composite film containing meso- and micro-pores was formed after the keratin—TiO<sub>2</sub> precursors coating was calcined. In comparison with calcinated TiO<sub>2</sub> films, the keratin char-TiO<sub>2</sub> composite films doped with the elements of C, N, and S from keratins resulted in decreased crystallinity and a larger water contact angle. The bandgap of the char-TiO<sub>2</sub> composite films increased slightly from 3.26 to 3.32 eV, and its separation of photogenerated charge carriers was inhibited to a certain degree. However, it exhibited higher photodegradation efficiency to methyl blue (MB) effluents than the pure calcinated TiO<sub>2</sub> films. This was mainly because of its special porous structure, large water contact angle, and high adsorption energy towards organic pollutants, confirmed by the density functional theory calculations. The main active species were <sup>1</sup>O<sub>2</sub> radicals in the MB photodegradation process.
format	article
author	Jinyuan Zhang Hui Zhang Wenjun Li Limeng Yang Hailiang Wu Ningtao Mao
author_facet	Jinyuan Zhang Hui Zhang Wenjun Li Limeng Yang Hailiang Wu Ningtao Mao
author_sort	Jinyuan Zhang
title	Photocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors
title_short	Photocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors
title_full	Photocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors
title_fullStr	Photocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors
title_full_unstemmed	Photocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors
title_sort	photocatalytic properties of a novel keratin char-tio<sub>2</sub> composite films made through the calcination of wool keratin coatings containing tio<sub>2</sub> precursors
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e4292cec3ec3470aa26c6c1c53f45917
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Photocatalytic Properties of a Novel Keratin char-TiO<sub>2</sub> Composite Films Made through the Calcination of Wool Keratin Coatings Containing TiO<sub>2</sub> Precursors

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