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Open AccessArticle

Adsorption of Cu(II) Ions on Adsorbent Materials Obtained from Marine Red Algae Callithamnion corymbosum sp.

1
Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iași “Cristofor Simionescu”, Iaşi 700050, Romania
2
Department of Geology, Faculty of Geography, “Al.I.Cuza” University of Iaşi, Iaşi 700506, Romania
3
Romanian Academy, Filial of Iaşi, Branch of Geography, Iaşi 700506, Romania
4
Petru Poni Institute of Macromolecular Chemistry, Laboratory of Physical Chemistry of Polymers, Iaşi 700506, Romania
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 372; https://doi.org/10.3390/w12020372
Received: 27 December 2019 / Revised: 26 January 2020 / Accepted: 28 January 2020 / Published: 30 January 2020
(This article belongs to the Special Issue Removal of Heavy Metals from Wastewater)
In recent years, studies on the more efficient use of natural materials in adsorption processes have increased significantly. Thus, obtaining new adsorbents from marine algae biomass with higher adsorptive performance will ensure a better use of these renewable resources. In this study, the adsorption of Cu(II) ions from aqueous solution was done using three types of adsorbent materials obtained from marine red algae biomass (Callithamnion corymbosum sp.), namely: alginate (Alg), algae waste biomass resulted after alginate extraction (AWB) and iron nanoparticles functionalized with alginate (Fe-NPs-Alg), compared to raw marine red algae biomass (RAB). FTIR spectra and SEM images recorded for each type of adsorbent indicate a porous structure and the presence of various superficial functional groups who may be involved in the retention of Cu(II) ions. The biosorption experiments were performed in a batch system, at different initial Cu(II) ion concentrations and contact times, maintaining a constant initial solution pH (4.4), adsorbent dose (2.0 g/L), and temperature (25 ± 1 °C). The obtained results indicate that the retention of Cu(II) ions requires a maximum of 60 min to reach equilibrium, and the maximum adsorption capacity increases in order: RAB (47.62 mg/g) < Fe-NPs-Alg (52.63 mg/g) < AWB (83.33 mg/g) < Alg (166.66 mg/g). The quantitative removal of Cu(II) ions from aqueous effluents can be done in two successive adsorption stages, using AWB (in the first stage) and Fe-NPs-Alg (in the second stage), when the treated solution has a Cu(II) ions concentration below the maximum permissible limit. The quantitative recovery of retained Cu(II) ions (over 97%) can be done by treating these exhausted adsorbent materials with 0.1 N HNO3 solution. Therefore, the extraction of alginate from marine red algae biomass could be a viable solution to obtain efficient adsorbent materials for Cu(II) ions removal from aqueous media, and allow for a better valorisation of marine red algae biomass. View Full-Text
Keywords: adsorption; Cu(II) ions; marine red algae biomass; aqueous media; valorisation adsorption; Cu(II) ions; marine red algae biomass; aqueous media; valorisation
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MDPI and ACS Style

Lucaci, A.R.; Bulgariu, D.; Popescu, M.-C.; Bulgariu, L. Adsorption of Cu(II) Ions on Adsorbent Materials Obtained from Marine Red Algae Callithamnion corymbosum sp.. Water 2020, 12, 372.

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