tailieunhanh - Báo cáo hóa học: " Synthesis and Photocatalytic Activity of Anatase TiO2 Nanoparticles-coated Carbon Nanotub"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis and Photocatalytic Activity of Anatase TiO2 Nanoparticles-coated Carbon Nanotub | Nanoscale Res Lett 2010 5 603-607 DOI S11671-009-9513-5 NANO EXPRESS Synthesis and Photocatalytic Activity of Anatase TiO2 Nanoparticles-coated Carbon Nanotubes Yi Xie Sung Hwan Heo Seung Hwa Yoo Ghafar Ali Sung Oh Cho Received 17 November 2009 Accepted 10 December 2009 Published online 24 December 2009 The Author s 2009. This article is published with open access at Abstract A simple and straightforward approach to prepare TiO2-coated carbon nanotubes CNTs is presented. Anatase TiO2 nanoparticles NPs with the average size 8 nm were coated on CNTs from peroxo titanic acid PTA precursor even at low temperature of 100 C. We demonstrate the effects of CNTs TiO2 molar ratio on the adsorption capability and photocatalytic efficiency under UV-visible irradiation. The samples showed not only good optical absorption in visible range but also great adsorption capacity for methyl orange MO dye molecules. These properties facilitated the great enhancement of photocatalytic activity of TiO2 NPs-coated CNTs photocatalysts. The TiO2 NPs-coated CNTs exhibited times higher photocatalytic activity for MO degradation than that of pure TiO2. Keywords TiO2 Carbon nanotubes Nanoparticles Photocatalyst Methyl orange Introduction TiO2 has been one of the most widely investigated and used materials over the past decades 1-3 because it is nontoxic easy to be made inexpensive and chemically stable. In recent years TiO2-based nanomaterials have attracted significant research attention due to their broad applications in the fields of water and air purification 4 5 H2 production 6 7 and photovoltaic and photoelectrochemical cells 8 9 . Y. Xie S. H. Heo S. H. Yoo G. Ali S. O. Cho H Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology KAIST 373-1 Guseong Yuseong Daejeon 305-701 Republic of Korea e-mail socho@ However one of the major factors that limit the efficiency of TiO2 photocatalysis is its fast .