Post-combustion CO2 capture using mesoporous TiO2/graphene oxide nanocomposites
| Autor: | Ganesh K. Parshetti, Rajasekhar Balasubramanian, Shamik Chowdhury |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Flue gas
Materials science Nanocomposite Graphene General Chemical Engineering Inorganic chemistry Oxide General Chemistry Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound Adsorption chemistry law Titanium dioxide Environmental Chemistry Selectivity Mesoporous material |
| Zdroj: | Chemical Engineering Journal. 263:374-384 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2014.11.037 |
| Popis: | The development of robust adsorbents with high adsorption capacity and high selectivity to separate CO 2 from flue gas streams, a major greenhouse gas contributing to global warming, is a topic of current global interest. In this study, a series of mesoporous titanium dioxide/graphene oxide (TiO 2 /GO) nanocomposites, with different GO to TiO 2 mass ratios, were synthesized using a simple colloidal blending process and systematically investigated for the first time as potential CO 2 adsorbent materials. The synthesized composites were characterized by diffraction, spectroscopy, and microscopy techniques. Pure component adsorption isotherms of CO 2 were measured at 0, 25, and 50 °C and pressures up to 100 kPa. Analysis of adsorption results showed that the CO 2 adsorption isotherms could be well fitted to the temperature dependent Toth model. The adsorption kinetic data were well-represented by the Avrami model. TiO 2 /GO exhibited a CO 2 uptake capacity of 1.88 mmol g −1 at room temperature, which is much higher than many other commonly used adsorbents. Moreover, TiO 2 /GO also demonstrated a low heat of adsorption and remarkably high CO 2 /N 2 selectivity and hence merits further consideration for capturing CO 2 from dry flue gas. |
| Databáze: | OpenAIRE |
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