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|title: ||Removal of mercury (II) by dithiocarbamate surface functionalized magnetite particles: application to synthetic and natural spiked waters|
|authors: ||Figueira, P.|
Lopes, C. B.
Daniel-da-Silva, A. L.
Duarte, A. C.
|issue date: ||Nov-2011|
|abstract: ||In order to take advantage of the high affinity between mercury and sulphur, magnetite
(Fe3O4) particles functionalized with dithiocarbamate groups (CS
2 ), were synthesized to be
used as a new type of sorbent to remove Hg (II) from synthetic and natural spiked waters.
The effectiveness of this type of sorbent was studied, and its potential as cleanup agent for
contaminated waters was assessed.
Batch stirred tank experiments were carried out by contacting a volume of solution with
known amounts of functionalized Fe3O4 particles, in order to study the effect of sorbent
dose, salinity, and the kinetics and the equilibrium of this unit operation. A complete Hg (II)
removal (ca. 99.8%) was attained with 6 mg/L of magnetic particles for an initial metal
concentration of 50 mg/L. It was confirmed that highly complex matrices, such as seawater
(ca. 99%) and river water (ca. 97%), do not affect the removal capacity of the functionalized
magnetic particles. Concerning isotherms, no significant differences were observed
between two- and three-parameter models (P ¼ 0.05%); however, Sips isotherm provided
the lowest values of SS and Sx/y, predicting a maximum sorption capacity of 206 mg/g, in
the range of experimental conditions under study. The solid loadings measured in this
essay surmount the majority of the values found in literature for other type of sorbents.|
|publisher version/DOI: ||dx.doi.org/10.1016/j.watres.2011.08.057|
|source: ||Water Research|
|appears in collections||DQ - Artigos|
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