Oxygen Deficient $ TiO_{2−x} $ with Dual Reaction Sites for Activation of $ H_{2} %$ O_{2} $ to Degrade Organic Pollutants

Abstract The present study reports the development of a novel defective $ TiO_{2−x} $ catalyst with oxygen vacancy (OV) which carries dual types of reaction sites for $ H_{2} %$ O_{2} $ activation. The performance of this catalyst on the degradation of organic pollutants was evaluated using organic...
Ausführliche Beschreibung

Abstract The present study reports the development of a novel defective $ TiO_{2−x} $ catalyst with oxygen vacancy (OV) which carries dual types of reaction sites for $ H_{2} %$ O_{2} $ activation. The performance of this catalyst on the degradation of organic pollutants was evaluated using organic dyes [such as methyl orange, methylene blue, and rhodamine B (RhB)] as model pollutants. The defects in $ TiO_{2−x} $ exhibited a wide pH working window (pH 2–9) for RhB degradation which is wider than that of traditional Fenton systems. Furthermore, this catalyst retained its high catalytic activity even after five cycles. It was confirmed that the surface OV and $ Ti^{3+} $ of $ TiO_{2−x} $ served as the active sites for $ H_{2} %$ O_{2} $ activation while the oxygen vacancy promoted adsorption of the organic pollutants, thus enhancing the Fenton-like catalytic performance. The results are applicable to Fenton catalysts via surface engineering and can stimulate new opportunities for the optimization of defect-type Fenton catalysts. Graphic Abstract This study, reports the defect of $ TiO_{2−x} $ oxygen vacancy (OV) catalyst with oxygen vacancy (OV) which carries dual types of reaction sites for H2O2 activation. The performance of this catalyst on the degradation of organic pollutants was evaluated using organic dyes [such as methyl orange, methylene blue, and rhodamine B (RhB)] as model pollutants. The defects in $ TiO_{2−x} $ exhibited a wide pH working window (pH 2–9) for RhB degradation which is wider than that of traditional Fenton systems. Figure shows the schematic of the reaction mechanism. First, $ H_{2} %$ O_{2} $ adsorbs on the $ TiO_{2−x} $ surfaces; consequently, the OV and $ Ti^{3+} $ serve as the “Fenton-catalytic” center for $ H_{2} %$ O_{2} $ activation to produce ·OH radicals on the $ TiO_{2−x} $ surface. Meanwhile, OV on $ TiO_{2−x} $ surface is beneficial for the adsorbed organic pollutants. Because of the generated hydroxyl radical on the $ TiO_{2−x} $ surface is very close to the adsorbed pollutant. As a result, the rapid reaction of in situ generated hydroxyl radical with the adsorbed organic pollutants on the $ TiO_{2−x} $ surface giving rise to excellent Fenton-like catalytic performance. The proposed overall Fenton-like reaction mechanism on oxygen deficient $ TiO_{2−x} $ catalyst. Ausführliche Beschreibung

Autor*in:	Qiu, Jiang-yuan [verfasserIn] Chen, Jian-hua [verfasserIn] Xiao, Bi-yuan [verfasserIn] Li, Xing-xing [verfasserIn] Wan, Ting [verfasserIn] Qin, Fang-hong [verfasserIn] Mi, Yan [verfasserIn] Huang, Zai-yin [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2019

Schlagwörter:	Dual reaction sites Density functional theory Heterogeneous fenton systems Oxygen-deficient metal oxides

Übergeordnetes Werk:	Enthalten in: Catalysis letters - Dordrecht [u.a.] : Springer Science + Business Media B.V, 1988, 150(2019), 1 vom: 03. Sept., Seite 222-233
Übergeordnetes Werk:	volume:150 ; year:2019 ; number:1 ; day:03 ; month:09 ; pages:222-233

Links:	Volltext

DOI / URN:	10.1007/s10562-019-02920-6

Katalog-ID:	SPR011357282