Synthesis of porous TiO<sub>2</sub> nanowires and their photocatalytic properties

doi:10.1007/s12200-017-0735-3

Front. Optoelectron.

2017, Vol. 10

Issue (4) : 395-401 https://doi.org/10.1007/s12200-017-0735-3

RESEARCH ARTICLE

Synthesis of porous TiO₂ nanowires and their photocatalytic properties

Yonglun TANG¹, Haibo REN², Jiarui HUANG²(

)

¹. Department of Fundamental Course Teaching, Anhui Technical College of Industry and Economy, Hefei 230051, China
². College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China

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Abstract

Porous titanium dioxide (TiO₂) nanowires were synthesized via a surfactant-free hydrothermal method followed by acid-washing process and calcination. The structures and morphologies of products were characterized by field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) N₂ adsorption-desorption analyses. The analysis of FESEM suggested the precursor was composed of a vast of uniform nanostructures like wires. The nanowire-like precursor was transformed into the porous nanowire after acid-treatment and calcination at 500°C for 2 h in air. The surface area of as-synthesized TiO₂ nanowires calculated by BET is 86.4 m²/g. Furthermore, the photocatalytic properties of synthesized porous TiO₂ nanowires were evaluated through the degradation of methylene blue (MB) and Rhodamine B (RhB). The results clearly suggested that the as-prepared porous TiO₂ nanowires showed remarkable photocatalytic performance on the degradation of RhB and MB due to their small size of nanocrystallites and the porous naonstructure.

Keywords titanium dioxide (TiO₂) nanowire porous photocatalyst photocatalytic performance

Corresponding Author(s): Jiarui HUANG

Just Accepted Date: 25 August 2017 Online First Date: 28 September 2017 Issue Date: 21 December 2017

Cite this article:

Yonglun TANG,Haibo REN,Jiarui HUANG. Synthesis of porous TiO₂ nanowires and their photocatalytic properties[J]. Front. Optoelectron., 2017, 10(4): 395-401.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-017-0735-3
https://academic.hep.com.cn/foe/EN/Y2017/V10/I4/395

Fig.1 XRD patterns of (a) Na₂Ti₃O₇ precursor and (b) TiO₂ product at 500°C for 2 h

Fig.2 Representative FESEM images of (a, b) the Na₂Ti₃O₇ nanowire precursor and (c, d) porous TiO₂ nanowires. (e) Typical TEM images and (f) HRTEM image of the porous TiO₂ nanowires. The inset is the corresponding TEM image at high magnification

Fig.3 N₂ adsorption-desorption isotherm and BJH pore size distribution plots (inset) of the porous TiO₂ nanowires. STP: standard temperature and pressure

Fig.4 Change of absorbance spectra of (a) RhB, (b) MB in solution with the concentration of 20 mg/L with porous TiO₂ nanowires under UV light irradiation. The insets are plots of photodegradation rate vs different irradiation time of RhB and MB under UV light irradiation with or without catalysts, where C_t is the concentration of dyes and C₀ is the initial concentration

Fig.5 Recycling results of the catalyst in the photodegradation of (a) MB, (b) RhB, in which C_t is the concentration of MB or RhB and C₀ is the initial concentration

Tab.1 Comparisons of the photocatalytic performances of TiO₂ materials with different morphologies

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