High performance polydopamine-functionalized mesoporous silica nanospheres for U(VI) removal
| Autor: | Min Sang, Linfeng Bai, Xinglong Gong, Jiaxing Li, Mei Liu, Sheng Wang, Shengxia Duan, Wanquan Jiang, Shouhu Xuan |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Aqueous solution Kinetics General Physics and Astronomy Langmuir adsorption model 02 engineering and technology Surfaces and Interfaces General Chemistry Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Endothermic process 0104 chemical sciences Surfaces Coatings and Films symbols.namesake Adsorption Chemical engineering Ionic strength Monolayer symbols Organic chemistry 0210 nano-technology |
| Zdroj: | Applied Surface Science. 426:1121-1132 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.07.274 |
| Popis: | This work reports the fabrication of polydopamine-functionalized mesoporous silica (mSiO 2 /PDA) nanospheres for removing U(VI) from aqueous solution. The maximum adsorption capacity of mSiO 2 /PDA is 332.3 mg/g at 318.15 K and pH = 5.5. In comparison to the pristine mSiO 2 , the adsorption capacity of mSiO 2 /PDA has been remarkably enhanced, which can be ascribed to the large amounts of functional groups existed on the surface of mSiO 2 /PDA. The adsorption process fits well with the pseudo-second-order kinetics model. The adsorption isotherm follows the Langmuir isotherm model, revealing a monolayer adsorption of U(VI) onto mSiO 2 /PDA. Thermodynamic analysis indicates a spontaneous and endothermic adsorption process. Additionally, this adsorption process is pH-dependent, while the effect of ionic strength is negligible. |
| Databáze: | OpenAIRE |
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