Functionalization of MCM-41 with titanium oxynitride deposited via PECVD for enhanced removal of methylene blue
| Autor: | Aleksander Gurlo, Maged F. Bekheet, André Ayral, Amr A. Nada, Stéphanie Roualdes |
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| Rok vydání: | 2019 |
| Předmět: |
Nanocomposite
Materials science Langmuir adsorption model 02 engineering and technology Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials symbols.namesake Adsorption Physisorption Chemical engineering Materials Chemistry symbols Surface modification Physical and Theoretical Chemistry 0210 nano-technology Mesoporous material Spectroscopy BET theory |
| Zdroj: | Journal of Molecular Liquids. 274:505-515 |
| ISSN: | 0167-7322 |
| Popis: | TiON and TiO2 were grafted onto the surfaces of mesoporous silica MCM-41 by plasma enhanced chemical vapour deposition (PECVD). The results of small-angle X-ray diffraction (SAXRD), X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and nitrogen physisorption revealed that the mesoporous structure of MCM-41 was retained and the pore size reduced from 2.46 nm to 2.19 nm and 2.18 nm after grafting of amorphous TiO2 and TiON, respectively. In consequence, the pore volume and BET surface area decreased. These results indicate the deposition of TiO2 and TiON particles on the surface of MCM-41, leading to partial blockage of its pores. The grafted materials were found to be effective adsorbents for methylene blue dye. The results of batch adsorption experiments at pH 7 demonstrated that TiON@mSiO2 nanocomposite showed the highest adsorption capacity in comparison with MCM-41 and TiO2@mSiO2, which is due to its highly negative zeta potential at neutral conditions. The equilibrium adsorption process fits well with the Langmuir isotherm model and the calculated maximum adsorbed quantity qmax was found to be 129 mg/g. The pseudo-second order model best represents the adsorption kinetics data. Accordingly, the TiON@mSiO2 nanocomposite can be used for the purification of wastewater from toxic organic dyes such as methylene blue. |
| Databáze: | OpenAIRE |
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