High performance polydopamine-functionalized mesoporous silica nanospheres for U(VI) removal

被引：71
|
作者：
Bai, Linfeng [1 ,2 ]
Duan, Shengxia [3 ]
Jiang, Wanquan [1 ]
Liu, Mei [1 ]
Wang, Sheng [1 ]
Sang, Min [1 ]
Gong, Xinglong [2 ]
Li, Jiaxing [3 ]
Xuan, Shouhu [2 ]
机构：
[1] USTC, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Dept Chem, Hefei 230026, Anhui, Peoples R China
[2] USTC, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Anhui, Peoples R China
[3] Chinese Acad Sci, Inst Plasma Phys, Key Lab Novel Thin Film Solar Cells, POB 1126, Hefei 230031, Anhui, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2017年 / 426卷
基金：
中国国家自然科学基金;
关键词：
Dopamine; Mesoporous silica; Adsorption; U(VI); MULTIWALLED CARBON NANOTUBES; AQUEOUS-SOLUTIONS; GRAPHENE OXIDE; EFFICIENT REMOVAL; URANIUM EXTRACTION; BIO-NANOCOMPOSITES; WASTE-WATER; ADSORPTION; SORPTION; RADIONUCLIDES;
D O I：
10.1016/j.apsusc.2017.07.274
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：1121 / 1132
页数：12
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