Simultaneous Adsorption and Degradation of Cr(VI) and Cd(II) Ions from Aqueous Solution by Silica-Coated Fe0Nanoparticles | Zendy

Yongchao Li | Zendy; Hongpu Ma | Zendy; Bozhi Ren | Zendy; Tielong Li | Zendy

Open Access

Simultaneous Adsorption and Degradation of Cr(VI) and Cd(II) Ions from Aqueous Solution by Silica-Coated Fe⁰Nanoparticles

Author(s) -

Yongchao Li,

Hongpu Ma,

Bozhi Ren,

Tielong Li

Publication year - 2013

Publication title -

journal of analytical methods in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.407

H-Index - 25

eISSN - 2090-8865

pISSN - 2090-8873

DOI - 10.1155/2013/649503

Subject(s) - aqueous solution , adsorption , degradation (telecommunications) , nanoparticle , ion , chemistry , nuclear chemistry , inorganic chemistry , materials science , nanotechnology , organic chemistry , telecommunications , computer science

Core-shell silica-coated Fe 0 nanoparticles (Fe@SiO 2 ) were prepared in one-step synthesis by aqueous reduction combined with modified Stöber method. The as-prepared Fe@SiO 2 were then used for simultaneous removal of Cr(VI) and Cd(II) from aqueous solution. Batch tests indicated that Fe@SiO 2 exhibited high removal capacity toward Cr(VI) and Cd(II). Cr(VI) was removed by Fe@SiO 2 through reduction rather than adsorption, while Cd(II) removal was mainly through adsorption. The removal rate increased with increasing initial Fe NPs dose and decreased with increasing initial Cr(VI) and Cd(II) concentrations. Cd(II) adsorption was also strengthened by Cr(VI) reduction with the release of OH − . The removals of Cr(VI) and Cd(II) were weakened in the presence of cations or humic acid, as a result of aggregation and less active site of Fe@SiO 2 . Overall, the simply prepared Fe@SiO 2 were potential material for the heavy metals removed from water.

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