Synthesis of multiwall carbon nanotubes/TiO2 nanotube composites with enhanced photocatalytic decomposition efficiency
| Autor: | Rajesh J. Tayade, Wan-Kuen Jo, Joon Yeob Lee, Hari C. Bajaj, Thillai Sivakumar Natarajan |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition Catalysis 0104 chemical sciences law.invention Rhodamine 6G chemistry.chemical_compound Adsorption chemistry law Transmission electron microscopy Photocatalysis Composite material 0210 nano-technology |
| Zdroj: | Catalysis Today. 282:13-23 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2016.03.018 |
| Popis: | Multiwall carbon nanotubes (MWCNT)-loaded TiO2 nanotube (TNT) composites were synthesized by hydrothermal method. Scanning electron microscopy and transmission electron microscopy revealed the tubular morphology of the prepared TNT and MWCNT/TNT composites, which was further confirmed by the increase in their surface area. The MWCNT/TNT photocatalysts show high photocatalytic decomposition efficiency (PDE) for the degradation of rhodamine 6G (RhB-6G) dye, with excellent stability and reusability. Among the MWCNT/TNT composites, 10% loading of MWCNT results in a significantly higher PDE (89%) as compared with that of bare TNT (78%), Degussa P-25 TiO2 (P25, 60%), and TiO2 nanoparticles (56%). The enhanced PDE of MWCNT/TNT composites is due to the ability of the MWCNTs to promote the electron transfer process and reduce the electron-hole pair recombination rate, as also confirmed by photoluminescence measurements. Moreover, chemical oxygen demand (COD) and total organic carbon (TOC) analyses were performed to verify the RhB-6G dye degradation. Tubular morphology, enriched adsorption, synergic effect, and efficient separation of photogenerated electron-hole pairs account for the enhanced PDE of MWCNT/TNT composites in the decomposition of RhB-6G dye under the current experimental conditions. |
| Databáze: | OpenAIRE |
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