Amine-functionalized magnetite-silica nanoparticles as effective adsorbent for removal of uranium(VI) ions

被引:50
|
作者
Gdula, Karolina [1 ]
Gladysz-Plaska, Agnieszka [2 ]
Cristovao, Beata [2 ]
Ferenc, Wieslawa [2 ]
Skwarek, Ewa [2 ]
机构
[1] Polish Acad Sci, Inst Agrophys, Doswiadczalna St 4, Lublin, Poland
[2] Marie Curie Sklodowska Univ, Fac Chem, Maria Curie Sklodowska Sq 3, Lublin, Poland
关键词
Magnetite nanoparticles; Core/shell silica particles; Amine functional groups; Surface chemistry; Adsorption of uranium ions; AQUEOUS-SOLUTIONS; MESOPOROUS SILICA; SORPTION BEHAVIOR; U(VI) ADSORPTION; ACTIVATED CARBON; URANYL IONS; PH; VI; BENTONITE; SURFACE;
D O I
10.1016/j.molliq.2019.111217
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
In our studies the Fe3O4/SiO2/C3H6NH2 (MSA) adsorbent was synthesized by the green-chemistry method based on hydrolysis and condensation of tetraethoxysilane and (3-aminopropyl)triethoxysilane. The obtained material was fully characterized by a wide range of instrumental techniques and employed as an adsorbent for removal of uranium(VI) ions which is considered as a hazardous metal. It was found that the adsorption process is very fast, and equilibrium is reached after about 4 h. The data was fitted with the pseudo-1st (PFO) and pseudo-2nd order (PSO) equations. It was turned out that better fit was obtained for the PSO kinetic model. The Freundlich, Langmuir-Freundlich and Dubinin-Radushkevich isotherm equations were used to calculate the equilibrium adsorption data. The static sorption capacity was 118 mg.g(-1). The energy value E-n = 14.8 kJ.mol(-1) (293 K) calculated based on the Dubinin-Radushkevich isotherm equation indicates that chemisorption is a dominant mechanism. The obtained data show that MSA material can be used as a promising adsorbent for radioactive metals removal. (C) 2019 Elsevier B.V. All rights reserved.
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页数:10
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