Fabrication, modification and environmental applications of TiO<sub>2</sub> nanotube arrays (TNTAs) and nanoparticles

doi:10.1007/s11705-011-1144-6

Front Chem Sci Eng

2012, Vol. 6

Issue (1) : 112-122 https://doi.org/10.1007/s11705-011-1144-6

RESEARCH ARTICLE

Fabrication, modification and environmental applications of TiO₂ nanotube arrays (TNTAs) and nanoparticles

S. ROHANI(

), T. ISIMJAN, A. MOHAMED, H. KAZEMIAN, M. SALEM, T. WANG

Department of Chemical and Biochemical Engineering, The University of Western Ontario, London N6A 5B9, Canada

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Abstract

Among the semiconductors, titanium dioxide has been identified as an effective photocatalyst due to its abundance, low cost, stability, and superior electronic energy band structure. Highly ordered nanotube arrays of titania were produced by anodization and mild sonication. The band gap energy of the titania nanotube arrays was reduced to 2.6 eV by co-doping with Fe, C, N atoms using an electrolyte solution containing K₃Fe(CN)₆. The photoconversion of phenol in a batch photoreactor increased to more than 18% based on the initial concentration of phenol by using a composite nanomaterial consisting of titania nanotube arrays and Pt/ZIF-8 nanoparticles. A layer-by-layer assembly technique for the deposition of titania nanoparticles was developed to fabricate air filters for the degradation of trace amounts of toluene in the air and preparation of superhyrophobic surfaces for oil-water separation and anti-corrosion surfaces.

Keywords TiO₂ nanotube arrays and nanoparticles anodization bandgap modification layer-by-layer deposition oil-water separation

Corresponding Author(s): ROHANI S.,Email:srohani@uwo.ca

Issue Date: 05 March 2012

Cite this article:

S. ROHANI,T. ISIMJAN,A. MOHAMED, et al. Fabrication, modification and environmental applications of TiO₂ nanotube arrays (TNTAs) and nanoparticles[J]. Front Chem Sci Eng, 2012, 6(1): 112-122.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-011-1144-6
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I1/112

Fig.1 Removal of the nanowires layer by sonication and fabrication of highly-ordered titanium nanotube arrays []

Fig.2 FE-SEM images of the surfaces of Ti samples anodized in glycerol-5 wt-% water-3 wt-% NHF solution at 30 V at 4 h. (a) Top view of as-prepared; (b) cross-section of as-prepared; (c) top view of annealed and sonicated; (d) cross-section of annealed and sonicated, and (e) higher magnification of top view of annealed and sonicated sample []

Fig.3 UV-Vis and XRD results of Fe-C-N-codoped TiO nanotubes []

Fig.4 Photo current (a) and photocurrent efficency diagrams (b) of TiO nanotubes []

Fig.5 Top view of SEM micrograph (a) unloaded TiO NTs; (b) Pt/ZIF-8 loaded TiO NTs; (c) larger magnitude of Pt/ZIF-8 loaded TiO NTs; (d) EDX results of Pt/ZIF-8 loaded TiO NTs []

Fig.6 UV absorption spectra of Pt/ZIF loaded TiO NTs and Pt/TiO NTs []

Fig.7 Schematic illustration of the coating process by means of layer by layer self assembly (LBL-SA) technique []

Fig.8 a) SEM images of a typical 10 layers of TiO nanoparticals coated on stainless steel meshes; (b) EDX results

Fig.9 Schematic diagram of the glass reactor equipped with a closed loop auto sampler connected to GC

Fig.10 Photocatalytic degradation of toluene on P25 photocatalyst mesh using cold cathode UV lamp (254 nm) as UV source

Fig.11 Photo degradation of phenol by Pt/ZIF loaded TiO NTs, Pt/TiO NTs

Fig.12 Schematic diagram of oil-water separation device 1 oil-water reservoir; 2 pump; 3 oil-water separation column; 4 water-collection column

Fig.13 SEM images of the coating mesh film prepared from a stainless steel mesh with an average pore diameter of about 150 μm (a) Large-area view of the coating mesh film; (b) enlarged view of the coating mesh film; (c) high-magnification images of the surface observed

Fig.14 Digital photograph (a) and optical image; (b) of water droplet on the mesh film

Tab.1 Oil (toluene) removal percentage vs. the content of oil in the feed

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