Journal
APPLIED SURFACE SCIENCE
Volume 426, Issue -, Pages 1121-1132Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.07.274
Keywords
Dopamine; Mesoporous silica; Adsorption; U(VI)
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Funding
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040502]
- fundamental research funds for the Central Universities [WK2480000002]
- National Natural Science Foundation of China [11372301, 11572310]
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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 332.3mg/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. (C) 2017 Elsevier B.V. All rights reserved.
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