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

Nanomaterials

Yongde Meng¹ 

[1] Department of Chemistry, Hanshan Normal University, Chaozhou 521041, China; E-Mail

关键词: core-shell;    adsorption property;   

DOI  :  10.3390/nano5020554

来源: mdpi

【 摘 要 】

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).

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.