Enhanced photoelectrochemical properties of hierarchical black TiO2-x nanolaces for Cr (VI) photocatalytic reduction

被引：49
作者：
Chahrour, Khaled M. [1 ]
Yam, F. K. [1 ]
Eid, A. M. [2 ]
Nazeer, Ahmed Abdel [3 ]
机构：
[1] Univ Sains Malaysia, Sch Phys, George Town 11800, Malaysia
[2] Univ Sains Malaysia, Sch Distance Educ, Chem Sect, George Town 11800, Malaysia
[3] Natl Res Ctr, Phys Chem Dept, Electrochem Lab, PO 12622, Giza, Egypt
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2020年 / 45卷 / 43期
关键词：
Hierarchical TiO2 nanolace; Ti3+ self-doping; Photoelectrochemical properties; Reduction of Cr (VI); VISIBLE-LIGHT; TITANIUM-DIOXIDE; NANOTUBE ARRAYS; HYDROGEN-PRODUCTION; SURFACE MODIFICATION; HEXAVALENT CHROMIUM; THERMAL-TREATMENT; CHARGE-TRANSFER; NANOROD ARRAYS; WATER;
D O I：
10.1016/j.ijhydene.2020.06.078
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, hierarchical TiO2 nanolace (NL-TiO2) films have been synthesized by a two-step anodization technique. This was followed by a reduction in a hydrogen atmosphere to prepare the reduced black version of such hierarchical nanolaces (NL-TiO2-x). The FESEM images confirmed highly-ordered nanolace arrays structure for all the synthesized films. The Ti3+ ions/oxygen vacancies were confirmed using XPS spectra. The photo -electrochemical properties of NL-TiO2-x showed superior character in comparison with NL-TiO2 by the virtue of the promoted electron-hole separation efficiency, which induced by the Ti3+ ions/oxygen vacancies in NL-TiO2-x. The data showed that the NL-TiO2-x film annealed at 650 degrees C attained the maximum photoelectrochemical properties with a signif-icant ABPE and IPCE of 0.58% and 52.51%, respectively. The applied photocatalytic reduc-tion of Cr (VI) as an environmental contaminant to Cr (III) was effectively done using NL-TiO2-x and NL-TiO2 annealed at 650 degrees C with a photocatalytic reduction rate 48.15% and 27.5%, respectively. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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页码：22674 / 22690
页数：17
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