resumo
The magnetic removal of Hg2+ from water has been assessed using silica coated magnetite particles. The magnetite particles were first prepared by hydrolysis of FeSO4 and their surfaces were modified with amorphous silica shells that were then functionalized with organic moieties containing terminal dithiocarbamate groups. Under the experimental conditions used, the materials reported here displayed high efficiency for Hg2+ uptake (74%) even at contaminant levels as low as 50 mu g l(-1). Therefore these eco-nanomagnets show great potential for the removal of heavy metal ions of polluted water, via magnetic separation. (c) 2010 Elsevier Inc. All rights reserved.
palavras-chave
SOLID-PHASE EXTRACTION; IMMOBILIZED-DITHIOCARBAMATE DERIVATIVES; PLASMA-MASS SPECTROMETRY; AQUEOUS-SOLUTIONS; HEAVY-METALS; WASTE-WATER; ENVIRONMENTAL APPLICATIONS; TITANOSILICATE ETS-4; SURFACE MODIFICATION; NATURAL-WATERS
categoria
Chemistry
autores
Girginova, PI; Daniel-Da-Silva, AL; Lopes, CB; Figueira, P; Otero, M; Amaral, VS; Pereira, E; Trindade, T
nossos autores
Ana Luísa Daniel da Silva
Investigador Principal
Cláudia Batista Lopes
Investigador Auxiliar
Paula Figueira
Técnico de Laboratório
Tito Trindade
Professor Catedrático
Vitor Brás Sequeira Amaral
Professor CatedráticoGrupos
G1 - Materiais Porosos e Nanossistemas
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
P.I. Girginova thanks Fundacao para a Ciencia e Tecnologia for a PhD Grant. We thank Dr. Benilde Costa (FCTUC) for the Mossbauer measurements and for the helpful discussions.