Experimental Measurement and Modeling of Hg(II) Removal from Aqueous Solutions Using Eucalyptus globulus Bark: Effect of pH, Salinity and Biosorbent Dosage
authors Fabre, E; Vale, C; Pereira, E; Silva, CM
nationality International
journal INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
author keywords Eucalyptus globulus bark; mercury; modelling; response surface methodology; sorption
keywords HEAVY-METALS; BIOSORPTION; ADSORPTION; SORPTION; BIOMASS; MERCURY; COPPER; IONS; CHROMIUM; WATERS
abstract Different experimental conditions were tested in order to optimize the Hg(II) removal by Eucalyptus globulus bark. Response surface methodology was applied to extract information about the significance of the factors and to obtain a model describing the sorption. The results were generated through the design of experiments by applying the methodology of a three-factor and three-level Box-Behnken design. The factors tested were pH (4.0, 6.5, and 9.0), salinity (0, 15, and 30), and biosorbent dosage (0.2, 0.5, and 0.8 g dm(-3)) to evaluate the Hg(II) removal using realistic conditions, such as contaminated natural waters with an initial Hg(II) concentration of 50 mu g dm(-3). The optimum response provided by the model was 81% of the metal removal under the optimal operating conditions: a pH value of 6.0, no salinity, and a biosorbent dosage of 0.55 g dm(-3). Concerning the kinetic, the pseudo-second-order equation fitted better to the experimental results with R-2 between 0.973 and 0.996. This work highlights the promising valorization of this biomass, which is an industrial byproduct and makes available information about the influence of the variables for Hg(II) removal in water treatment processes.
publisher MDPI
isbn 1422-0067
year published 2019
volume 20
issue 23
digital object identifier (doi) 10.3390/ijms20235973
web of science category Biochemistry & Molecular Biology; Chemistry, Multidisciplinary
subject category Biochemistry & Molecular Biology; Chemistry
unique article identifier WOS:000504428300155
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journal analysis (jcr 2019):
journal impact factor 4.556
5 year journal impact factor 4.653
category normalized journal impact factor percentile 74.208
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