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Open AccessArticle

Synthesis and Adsorption Property of SiO2@Co(OH)2 Core-Shell Nanoparticles

Department of Chemistry, Hanshan Normal University, Chaozhou 521041, China
Academic Editor: Jiye Fang
Nanomaterials 2015, 5(2), 554-564; https://doi.org/10.3390/nano5020554
Received: 10 February 2015 / Revised: 17 March 2015 / Accepted: 19 March 2015 / Published: 3 April 2015
(This article belongs to the Special Issue Nanomaterials for Energy and Sustainability Applications)
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). View Full-Text
Keywords: core-shell; adsorption property core-shell; adsorption property
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Meng, Y. Synthesis and Adsorption Property of SiO2@Co(OH)2 Core-Shell Nanoparticles. Nanomaterials 2015, 5, 554-564.

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