Next Article in Journal
Genome-Wide Identification and Analysis of the NPR1-Like Gene Family in Bread Wheat and Its Relatives
Previous Article in Journal
Tight Junctions in Cell Proliferation
Open AccessArticle

Experimental Measurement and Modeling of Hg(II) Removal from Aqueous Solutions Using Eucalyptus globulus Bark: Effect of pH, Salinity and Biosorbent Dosage

1
CICECO (Aveiro Institute of Materials) and CESAM (Centro de Estudos do Ambiente e do Mar), University of Aveiro, 3810-193 Aveiro, Portugal
2
CIIMAR (Interdisciplinary Centre of Marine and Environmental Research), University of Porto, 4050-123 Matosinhos, Portugal
3
CESAM and LAQV (Laboratório associado para a Química Verde)-REQUIMTE (Rede de Química e Tecnologia), University of Aveiro, 3810-193 Aveiro, Portugal
4
CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(23), 5973; https://doi.org/10.3390/ijms20235973
Received: 17 October 2019 / Revised: 15 November 2019 / Accepted: 23 November 2019 / Published: 27 November 2019
(This article belongs to the Section Physical Chemistry and Chemical Physics)
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 µg 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. View Full-Text
Keywords: Eucalyptus globulus bark; mercury; modelling; response surface methodology; sorption Eucalyptus globulus bark; mercury; modelling; response surface methodology; sorption
Show Figures

Figure 1

MDPI and ACS Style

Fabre, E.; Vale, C.; Pereira, E.; Silva, C.M. Experimental Measurement and Modeling of Hg(II) Removal from Aqueous Solutions Using Eucalyptus globulus Bark: Effect of pH, Salinity and Biosorbent Dosage. Int. J. Mol. Sci. 2019, 20, 5973.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop