resumo
This work describes the synthesis of CuS powders in high yield and via an environmentally friendly and straightforward process, under ambient conditions (temperature and pressure), by adding to aqueous copper (II) a nutrient solution containing biologically generated sulfide from sulfate-reducing bacteria (SRB). The powders obtained were composed of CuS (covellite) nanoparticles (NPs) exhibiting a spheroid morphology (<5 nm). The relevance of this method to obtain CuS supported solid substrates has been demonstrated by performing the synthesis in the presence of TiO2 and SiO2 submicron particles. We further extended the work carried out, which substantiates the potential of using biogenic sulfide for the production of covellite nanocrystals and composites, using the effluent of a bioremediation column. Hence, such process results in the synthesis of added value products obtained from metal rich effluents, such as metallurgical and industrial ones, or Acid Mine Drainage (AMD), when associated with bioremediation processes. (C) 2013 Elsevier Ltd. All rights reserved.
palavras-chave
SULFATE-REDUCING BACTERIA; ACID-MINE DRAINAGE; METAL NANOPARTICLES; HYDROGEN-SULFIDE; PRECIPITATION; CUS; GROWTH; WATER; REACTOR; CARBON
categoria
Environmental Sciences & Ecology
autores
da Costa, JP; Girao, AV; Lourenco, JP; Monteiro, OC; Trindade, T; Costa, MC
nossos autores
Ana Violeta Girão
Investigador Júnior
João Miguel Martins Novaes Pinto da Costa
Bolseiro de investigação
Tito Trindade
Professor CatedráticoGrupos
G1 - Materiais Porosos e Nanossistemas
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
agradecimentos
Funding by Fundacao para a Ciencia e a Tecnologia (FCT) through a PhD grant (SFRH/BD/43784/2008) and through project PTDC/AAG-TEC/2721/2012 is acknowledged. A. V. Girao also thanks FCT for the Post-Doc grant (SFRH/BPD/66407/2009).