| Autor: |
Hainging Liu, Ming Fang, Ge Liu, Huiyang Mei, Xiaoli Tan |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
SCIENTIA SINICA Chimica. 49:145-154 |
| ISSN: |
1674-7224 |
| Popis: |
In this study, sodium titanate anchoring on graphene oxide (GO/Na2Ti3O7) was successfully synthesized via a facile hydrothermal method. GO/Na2Ti3O7 nanocomposites were applied to remove 60Co(II) from aqueous solution, exhibiting superior removal capacity of 590.7 mg/g which is higher than that of Na2Ti3O7 ( 114.1 mg/g ) at pH 5.5 and 318 K. The sorption kinetics follows the pseudo-second-order model well. The effect of ionic strength on 60Co(II) sorption by GO/Na2Ti3O7 suggests the sorption process is attributed to ion exchange process at pH 7.0. The Langmuir model is better than the Freundlich model in description of the sorption isotherm data. Thermodynamic parameters indicate that the sorption process is spontaneous and endothermic. The shrink of plane (100) implies the irreversible sorption of the ion-exchange process. Fourier transformed infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses show that the –OH groups are also responsible for the high effective sorption of 60Co(II) on GO/Na2Ti3O7. The combination of Na2Ti3O7 and GO is predicted to increase the effective surface area of Na2Ti3O7, and then potentially enhance the 60Co(II) sorption in aqueous media. Findings of this study highlight the potential utility of GO/Na2Ti3O7 as the efficient adsorbent for 60Co(II) in nuclear wastewater treatment. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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