tailieunhanh - Hydrothermal synthesis and enhanced photocatalytic activity of tio2 fe@cnts nanocomposite for methylene blue degradation under visible light irradiation

TiO2-Fe@CNTs nanocomposite materials were synthesized by hydrothermal route in Teflon-sealed autoclave at 180˚C for 10h. The FESEM and X-Ray diffraction measurements were taken for morphology and structural analysis of TiO2 nanoparticles doped with Fe coating on CNTs. The effects of the iron and CNTs on the enhanced photocatalytic activity for methylene blue degradation under AM illumination of 100 −2were investigated. | Communications in Physics, Vol. 24, No. 4 (2014), pp. 363-369 DOI: HYDROTHERMAL SYNTHESIS AND ENHANCED PHOTOCATALYTIC ACTIVITY OF TiO2 -Fe@CNTs NANOCOMPOSITE FOR METHYLENE BLUE DEGRADATION UNDER VISIBLE LIGHT IRRADIATION LE HA CHI, PHAM DUY LONG, NGUYEN VAN CHUC, AND LE VAN HONG Institute of Materials Science, Vietnam Academy of Science and Technology E-mail: chilh@ Received 26 November 2014 Accepted for publication 12 December 2014 Abstract. TiO2 is one of the most attractive metal oxides because of the excellent chemical and photocatalytic properties. However, a problem in the application of TiO2 is the large band gap energy of eV, corresponding to its photocatalytic activity under UV-light irradiation of wavelengths < 387 nm. In this work, TiO2 nanoparticles doped with iron were grown on the surface of functionalized carbon nanotubes (TiO2 -Fe@CNTs) to expand the photoabsorbance of the nanocomposite materials in the visible light region and improve their photocatalytic activity. TiO2 -Fe@CNTs nanocomposite materials were synthesized by hydrothermal route in Teflon-sealed autoclave at 180˚C for 10h. The FESEM and X-Ray diffraction measurements were taken for morphology and structural analysis of TiO2 nanoparticles doped with Fe coating on CNTs. The effects of the iron and CNTs on the enhanced photocatalytic activity for methylene blue degradation under AM illumination of 100 −2 were investigated. Keywords: TiO2 , photocatalysis, nanotechnology. I. INTRODUCTION Titanium dioxide (TiO2 ) has been extensively used semiconductor in solar cells, gas sensors, photocatalysis and photochemical processes due to its stability, low cost and non-toxicity [1]. However, narrow light response range under UV-light irradiation of wavelengths < 387 nm (corresponding to TiO2 band gap energy about eV) which accounts only for 4% of the incoming solar energy and low separation probability of the photoinduced electron – hole

• Vật lý
• Communications in Physics
• Hydrothermal synthesis and enhanced photocatalytic activity
• TiO2 Fe@CNTs nanocomposite
• Methylene blue degradation under visible light irradiation
• The iron and CNTs
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