Efficient sorbents based on magnetite coated with siliceous hybrid shells for removal of mercury ions
authors Tavares, DS; Daniel-da-Silva, AL; Lopes, CB; Silva, NJO; Amaral, VS; Rocha, J; Pereira, E; Trindade, T
nationality International
journal JOURNAL OF MATERIALS CHEMISTRY A
keywords HEAVY-METAL IONS; AQUEOUS-SOLUTION; NANOPARTICLES; WATER; SURFACE; PARTICLES; GEL; NANOMATERIALS; REMEDIATION; NANOCOMPOSITES
abstract New sorbents based on magnetite particles coated with siliceous shells were synthesized and tested in the removal of mercury ions from aqueous solutions by magnetic separation. Atomic fluorescence spectroscopy studies performed on water samples treated with these sorbents have shown that the metal ion concentration decreased to values lower than the guideline values for drinking water. The high adsorption affinity for mercury ions in these materials was attributed to dithiocarbamate groups grafted over the siliceous domains using a new surface modification method. Hence, the magnetic particles have been coated with amorphous silica shells that include thiolate moieties via a hydrolytic co-condensation process using tetraethoxysilane (TEOS) and siloxydithiocarbamate (SiDTC) as the sol-gel precursors. This one-step method for the surface modification of magnetite particles led to sorbents with extensive thiolate moieties that can be then collected by applying an external magnetic field.
publisher ROYAL SOC CHEMISTRY
issn 2050-7488
year published 2013
volume 1
issue 28
beginning page 8134
ending page 8143
digital object identifier (doi) 10.1039/c3ta10914c
web of science category Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary
subject category Chemistry; Energy & Fuels; Materials Science
unique article identifier WOS:000320876000009

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