Synthesis of mesoporous silica-calcium phosphate hybrid nanoparticles and their potential as efficient adsorbent for cadmium ions removal from aqueous solution.

Author(s) He, Y.; Luo, L.; Liang, S.; Long, M.; Xu, H.
Journal J Colloid Interface Sci
Date Published 2018 Sep 01

Since adsorption and nanomaterials had been respectively found to be the most promising technique and the preferred adsorbents for heavy metal ions removal, in this study, novel mesoporous silica-calcium phosphate (MS-CP) hybrid nanoparticles were synthesized by a facile one-pot method, and subsequently assessed as adsorbent for Cd removal from aqueous solution. MS-CP were characterized by scanning and transmission electron microscopies, etc. The influences of initial Cd concentration, contact time, solution temperature and solution pH on removal efficiency of Cd were investigated in detail. The results revealed that MS-CP were nanospheres of ∼20 nm and presented a bimodal pore distribution (3.82 nm and 12.40 nm), a high surface area (314.56 m/g) and a large pore volume (1.21 cm/g). The Cd removal experiments demonstrated that MS-CP had a high adsorption capacity due to electrostatic interaction between Cd and silanol groups on MS-CP surface, as well as ion-exchange between Cd and calcium in MS-CP. Additionally, removal efficiency of Cd increased with increasing contact time and solution temperature, while decreased as initial Cd concentration increased. The maximum adsorption capacity of Cd by MS-CP was above 153 mg/L. These results suggested that the as-synthesized MS-CP could be promising adsorbent for Cd removal from aqueous solution.

DOI 10.1016/j.jcis.2018.04.037
ISSN 1095-7103
Citation J Colloid Interface Sci. 2018;525:126135.

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