Removal of mercury(II) from contaminated water by gold-functionalised Fe 3 O 4 magnetic nanoparticles.

Autor: Maia LFO; Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil., Santos MS; Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil., Andrade TG; Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil., Hott RC; Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil., Faria MCDS; Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil., Oliveira LCA; Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil., Pereira MC; Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil., Rodrigues JL; Instituto de Ciência, Engenharia e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Teófilo Otoni, Brazil.
Jazyk: angličtina
Zdroj: Environmental technology [Environ Technol] 2020 Mar; Vol. 41 (8), pp. 959-970. Date of Electronic Publication: 2018 Oct 04.
DOI: 10.1080/09593330.2018.1515989
Abstrakt: Fe 3 O 4 nanoparticles were prepared by co-precipitation of Fe 2+ and Fe 3+ and then modified with Au to produce an effective adsorbent (Fe 3 O 4 /Au) for aqueous Hg(II) in contaminated water. Rietveld refinement on the XRD pattern confirmed that the Fe 3 O 4 /Au was synthesised. Mössbauer spectra exhibited broad and asymmetric resonance lines with two sextets which can be assigned to tetrahedral Fe 3+ ; and octahedral Fe 3+ /Fe 2+ . The quantitative analysis of magnetite confirms that the sample shows around 3 wt.% Au and 97 wt.% partially oxidised Fe 3 O 4 . High surface area: 121 m 2 g -1 , average pore sizes: 6.3 nm and pore volume: 1.64 cm 3 g -1 . The kinetics data were better fitted with a pseudo-second-order and Dubinin-Radushkevich isotherm suggests the Hg(II) adsorption onto Fe 3 O 4 /Au nanoparticles was mainly by chemical adsorption forming complex with the Au metal immobilised on Fe 3 O 4 surfaces. Adsorption capacity of 79.59 mg g -1 . Ionic strength and co-existing ions had a slight influence on the adsorption capacity.
Databáze: MEDLINE
Externí odkaz: