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Type: Journal article
Title: Single-crystal-like black Zr-TiO₂ nanotube array film: an efficient photocatalyst for fast reduction of Cr(VI)
Other Titles: Single-crystal-like black Zr-TiO(2) nanotube array film: an efficient photocatalyst for fast reduction of Cr(VI)
Author: Wang, S.
Zhang, Z.
Huo, W.
Zhang, X.
Fang, F.
Xie, Z.
Jiang, J.
Citation: Chemical Engineering Journal, 2021; 403:1-10
Publisher: Elsevier
Issue Date: 2021
ISSN: 1385-8947
Statement of
Shiqi Wang, Zeling Zhang, Wenyi Huo, Xuhai Zhang, Feng Fang, Zonghan Xie, Jianqing Jiang
Abstract: Photocatalytic reduction of heavy metal ions offers an eco-friendly approach to wastewater treatment. However, most photocatalysts are suffering from rapid bulk and surface recombination of photo-generated charges, as well as low utilization of visible light. Herein, the simultaneous enhancement of bulk and surface separation of photo-induced charges by combining crystallographic preferred orientation (CPO) and surface oxygen vacancies (OVs) of single crystal-like black Zr doped TiO2 nanotube arrays film (BLK-Zr-NTAs) is reported. The CPO of BLK-Zr-NTAs along [0 0 1] direction suppressed the number of recombination centers in bulk, thus driving rapid separation/migration of photo-generated carriers from bulk to the surface. Meanwhile, the large amounts of OVs acted as electron trapping sites to inhibit the charges recombination. Besides, the introduction of OVs widened the light-absorption range, extending up to 1200 nm. The BLK-Zr-NTAs show outstanding photocatalytic performance towards Cr(VI) without using any sacrificial agents or co-catalysts, in so doing emerging as one of the best photocatalysts dedicated to Cr(VI) reduction reported so far.
Keywords: Black TiO2; Nanotube array film; preferential crystal orientation; oxygen vacancies; photocatalytic reduction
Rights: © 2020 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.cej.2020.126331
Grant ID: ARC
Published version:
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