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Sunlight activated anodic freestanding ZrO2 nanotube arrays for Cr(VI) photoreduction

Authors :
Atsunori Matsuda
Nurulhuda Bashirom
Khairunisak Abdul Razak
Zainovia Lockman
Tan Wai Kian
Go Kawamura
Source :
Nanotechnology. 29:375701
Publication Year :
2018
Publisher :
IOP Publishing, 2018.

Abstract

Visible-light-active freestanding zirconia (ZrO2) nanotube (FSZNT) arrays were fabricated by a facile electrochemical anodization method in fluoride containing ethylene glycol electrolyte added to it was 1 vol% of potassium carbonate (K2CO3) at 60 V for 1 h. Poor adhesion at the metal∣oxide interface was induced by K2CO3 leading to the formation of FSZNT flakes. The effect of the crystal structures of the FSZNTs e.g., amorphous, amorphous/tetragonal, and tetragonal/monoclinic was investigated towards the photocatalytic reduction of 10 ppm hexavalent chromium, Cr(VI) at pH 2 under sunlight. The results demonstrate the amorphous FSZNTs exhibited the highest Cr(VI) removal efficiency than the crystalline FSZNTs (95% versus 33% after 5 h). The high photocatalytic activity of the amorphous FSZNTs can be attributed to enhanced Cr(VI) adsorption, high visible light absorption, and better charge carrier separation. The low photocatalytic activity of the crystalline FSZNTs annealed at 500 °C was mainly attributed to poor Cr(VI) adsorption, low visible light absorption, and less photoactive monoclinic-ZrO2.

Details

ISSN :
13616528 and 09574484
Volume :
29
Database :
OpenAIRE
Journal :
Nanotechnology
Accession number :
edsair.doi...........59ef094598118c4d0e19bf3a3cabe3ab
Full Text :
https://doi.org/10.1088/1361-6528/aaccbd