Back to Search
Start Over
Sunlight activated anodic freestanding ZrO2 nanotube arrays for Cr(VI) photoreduction
- 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.
- Subjects :
- Nanotube
Materials science
Mechanical Engineering
Bioengineering
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Amorphous solid
chemistry.chemical_compound
Tetragonal crystal system
Adsorption
chemistry
Mechanics of Materials
Photocatalysis
General Materials Science
Electrical and Electronic Engineering
Hexavalent chromium
0210 nano-technology
Ethylene glycol
Nuclear chemistry
Visible spectrum
Subjects
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