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Characteristics and performance of rutile/anatase/brookite TiO2 and TiO2–Ti2O3(H2O)2(C2O4)·H2O multiphase mixed crystal for the catalytic degradation of emerging contaminants

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Abstract

Rutile TiO2 and binary/ternary/quaternary the TiO2–Ti2O3(H2O)2(C2O4)·H2O mixed crystal possessing self-assembled morphology and serving as catalysts for the photocatalytic degradation of organic pollutants or as photoanodes for photoelectrochemical (PEC) water splitting have been prepared by in situ growth via changing the concentration of potassium titanyl oxalate. The rutile/anatase TiO2 with mesoporous structure has a specific surface area of 27.896 m2 g−1 and an average pore size of 3.411 nm. The sample has a relatively more regular self-assembly morphology after heat-treatment at different temperatures; however, its photocatalytic activity is reduced. Excellent catalytic oxidation of methyl orange (MO) and hydroxylbenzoic acid (HBA) is observed on the as-synthesized samples, wherein rutile/anatase TiO2 and rutile/anatase/brookite TiO2–Ti2O3(H2O)2(C2O4)·H2O show excellent photocatalytic activity under UV-light. With the novel TiO2–Ti2O3(H2O)2(C2O4)·H2O mixed crystal catalyst, this study illustrates the photocatalysis mechanism of a multiphase mixed crystal for the removal of emerging contaminants in water. Based on the Mott–Schottky, XPS and energy band structure data, we consider that an indirect Z-scheme transmission mode is generated between rutile/anatase TiO2 or TiO2–Ti2O3(H2O)2(C2O4)·H2O mixed crystal, wherein the photo-induced electrons in rutile TiO2 combined with the holes in anatase TiO2 or Ti2O3(H2O)2(C2O4)·H2O, leading to enhanced charge carrier extraction and utilization upon photoexcitation.

Graphical abstract: Characteristics and performance of rutile/anatase/brookite TiO2 and TiO2–Ti2O3(H2O)2(C2O4)·H2O multiphase mixed crystal for the catalytic degradation of emerging contaminants

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Supplementary files

Article information


Submitted
25 Oct 2019
Accepted
06 Jan 2020
First published
15 Jan 2020

CrystEngComm, 2020, Advance Article
Article type
Paper

Characteristics and performance of rutile/anatase/brookite TiO2 and TiO2–Ti2O3(H2O)2(C2O4)·H2O multiphase mixed crystal for the catalytic degradation of emerging contaminants

K. Hu, L. E, D. Zhao, Y. Li, W. Zhao and H. Rong, CrystEngComm, 2020, Advance Article , DOI: 10.1039/C9CE01694E

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