Remarkably enhanced photocatalytic activity by sulfur-doped titanium dioxide in nanohybrids with carbon nanotubes |
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| Affiliation: | 1. Center for Nano Science and Technology, Hanoi National University of Education, 136 Xuan Thuy, Hanoi, Vietnam;2. Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam;1. Research Institute for Natural Sciences and Department of Chemistry, Hanyang University, Seoul 133-791, South Korea;2. Center for Advanced Instrumentation, Korea Research Institute of Standards and Science, Daejeon 34113, South Korea;1. Institute of Carbon Science and Technology, Shinshu University, Nagano 380-8553, Japan;2. Nissin Kogyo Co. Ltd., 801 Kazawa, Tomi-shi, Nagano 386-8505, Japan;1. Concordia Centre for Composites (CONCOM), Department of Mechanical and Industrial Engineering, Concordia University, 1455 De Maisonneuve Blvd. W., Montreal, Quebec, H3G1M8, Canada;2. Center for Applied Research on Polymers and Composites (CREPEC), Canada |
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| Abstract: | TiO2 doped S nanohybrids with carbon nanotubes (CNTs) were synthesized with CNTs, thiourea and TiO2 nanoparticles. The result indicated that the TiO2 nanoparticles with about 8 nm in size are attached on the sidewall of CNTs. The nanohybrids material can absorb at longer wavelength and the absorption even covers the whole range of visible region than that only TiO2 nanoparticles. Application of the catalysts to photocatalytic degradation of methylene blue (MB) was tested under visible light irradiation. The result suggests that a high MB degradation activity of S-TiO2/CNTs due to a reduce band gap of TiO2 when S is doped, and the decrease in the possibility of electron–hole recombination by CNTs. In addition, the density functional-theory (DFT) calculations of the electronic band structures and density of states (DOS) to understand the bonding states between TiO2 and CNTs, proved that the TiO2/CNTs system is stable. |
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| Keywords: | CNTs Nanohybrids Photocatalytic |
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