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Ferromagnetic Sorbents Based on Nickel Nanowires for Efficient Uptake of Mercury from Water

2014; American Chemical Society; Volume: 6; Issue: 11 Linguagem: Inglês

10.1021/am5010865

1944-8252

Paula C. Pinheiro, Daniela Tavares, Ana L. Daniel‐da‐Silva, Cláudia B. Lopes, Eduarda Pereira, João P. Araújo, C. T. Sousa, Tito Trindade,

Nanoporous metals and alloys

This work reports the preparation of ferro-magnetic nickel nanowires (NiNW) coated with dithiocarbamate-functionalized siliceous shells and its application for the uptake of aqueous Hg(II) ions by magnetic separation. NiNW with an average diameter and length of 35 nm and 5 μm, respectively, were firstly prepared by Ni electrodeposition in an anodic aluminum oxide template. The NiNW surfaces were then coated with siliceous shells containing dithiocarbamate groups via a one-step procedure consisting in the alkaline hydrolytic co-condensation of tetraethoxysilane (TEOS) and a siloxydithiocarbamate precursor (SiDTC). A small amount of these new nanoadsorbents (2.5 mg·L(-1)) removed 99.8% of mercury ions from aqueous solutions with concentration 50 μg·L(-1) and in less than 24 h of contact time. This outstanding removal ability is attributed to the high affinity of the sulfur donor ligands to Hg(II) species combined with the high surface area-to-volume ratio of the NiNW.