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Preparation and characterization of nanostructured MWCNT-TiO2 composite materials for photocatalytic water treatment applications |
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| Authors: | Wendong Wang Philippe Serp Cláudia Gomes Silva |
| Affiliation: | a Laboratório de Catálise e Materiais, Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias s/n 4200-465 Porto, Portugal b Laboratoire de Chimie de Coordination UPR 8241 CNRS, Ecole Nationale Supérieure d’Ingénieurs en Arts Chimiques Et Technologiques, 118 Route de Narbonne Toulouse Cedex 31077, France c Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, People's Republic of China |
| Abstract: | Nanoscale composite materials containing multi-walled carbon nanotubes (MWCNT) and titania were prepared by using a modified sol-gel method. The composites were comprehensively characterized by thermogravimetric analysis, nitrogen adsorption-desorption isotherm, powder X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, transmission electron microscopy, X-ray photoelectron spectroscopy and UV-vis absorption spectroscopy. The analysis revealed the presence of titania crystallites of about 7.5 nm aggregated together with MWCNT in particles of 15-20 nm of diameter. The photoactivity of the prepared materials, under UV or visible irradiation, was tested using the conversion of phenol from model aqueous solutions as probe reaction. A synergy effect on the photocatalytic activities observed for the composite catalysts was discussed in terms of a strong interphase interaction between carbon and TiO2 phases by comparing the different roles of MWCNT in the composite materials. |
| Keywords: | A Nanostructures A Composites B Sol-gel chemistry C Photoelectron spectroscopy D Catalytic properties |
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