Synthesis and Adsorption Property of SiO2o(OH)2 Core-Shell Nanoparticles

Silica nanoparticles were directly coated with cobalt hydroxide by homogeneous precipitation of slowly decomposing urea in cobalt nitrate solution. The cobalt hydroxide was amorphous, and its morphology was nanoflower-like. The BET (Brunauer-Emmett-Teller) surface area of the core-shell composite wa...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2015-01, Vol.5 (2), p.554-564
Main Author: Meng, Yongde
Format: Article
Language:English
Subjects:
Adsorption
Cobalt
Electropositivity
Hydroxides
Nanoparticles
Nanostructure
Silicon dioxide
Surface chemistry
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Summary:Silica nanoparticles were directly coated with cobalt hydroxide by homogeneous precipitation of slowly decomposing urea in cobalt nitrate solution. The cobalt hydroxide was amorphous, and its morphology was nanoflower-like. The BET (Brunauer-Emmett-Teller) surface area of the core-shell composite was 221 m2/g. Moreover, the possible formation procedure is proposed: the electropositive cobalt ions were first adsorbed on the electronegative silica nanoparticles surface, which hydrolyzed to form cobalt hydroxide nanoparticles. Then, the cobalt hydroxide nanoparticles were aggregated to form nanoflakes. Finally, the nanoflakes self-assembled, forming cobalt hydroxide nanoflowers. Adsorption measurement showed that the core-shell composite exhibited excellent adsorption capability of Rhodamine B (RB).
ISSN:2079-4991
DOI:10.3390/nano5020554