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  • 1
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    New polymeric/inorganic hybrid sorbents based on red mud and nanosized magnetite for large scale applications in As(V) removal. (2017)
    Elsevier
    In:  Chemical Engineering Journal, 311 . pp. 117-125.
    Details
    Publication Date: 2020-02-06
    Description: Highlights: • Chitosan constitutes a good polymer for iron oxide immobilization. • Sorption properties of iron oxides are not inhibited by chitosan coating. • Hybrid materials present good mechanical properties for water pollution treatment. • Arsenic can be efficiently removed using cost-effective hybrid polymeric materials. Abstract Red mud (RM), a waste product generated in the industrial production of aluminium, was recovered for a second use as As(V) adsorbent. RM adsorption properties were compared to those obtained with a nanostructured in-lab synthesized iron oxide, magnetite. Operational problems associated with powdery consistency of raw materials were solved with the synthesis of new polymeric/inorganic hybrid sorbents by dispersing red mud and magnetite in chitosan. The behaviour of raw red mud and magnetite towards As(V) adsorption has been critically compared with that observed for the hybrid materials. pH dependence studies demonstrated that near neutral environments favour As(V) elimination. The sorption kinetics for the iron oxides showed that equilibrium was reached in less than 3 h for raw materials and up to 15 h for immobilized red mud and magnetite. The amount of arsenic sorbed on the four different sorbents as a function of the equilibrium arsenic concentration has been fitted to a Freundlich isotherm and a multilayer adsorption mechanism is proposed. Finally, continuous flow experiments were developed using chitosan immobilized red mud. Results allowed selecting batch conformation as the most effective for As(V) removal.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.cej.2016.11.081
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    A Systematic Analysis and Review of the Fundamental Acid-Base Properties of Biosorbents (2018)
    Springer International
    In:  In: Green Adsorbents for Pollutant Removal. , ed. by Crini, G. and Lichtfouse, E. Environmental Chemistry for a Soustainable World, 18 . Springer International, Cham, pp. 73-133. ISBN 978-3-319-92111-2
    Details
    Publication Date: 2019-04-30
    Type: Book chapter , NonPeerReviewed
    DOI: 10.1007/978-3-319-92111-2_3
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    OceanRep: Book chapter
  • 3
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    Biosorption of chemical species by Sargassum algal biomass: Equilibrium data, part I (2020)
    Elsevier
    In:  In: Handbook of Algal Science, Technology and Medicine. , ed. by Konur, O. Elsevier, San Diego, pp. 675-696.
    Details
    Publication Date: 2020-04-08
    Description: The analysis of more than 400 papers found in the literature on Sargassum biosorption has shown the existence of more than 700 equilibrium entries corresponding to data at different temperature and pH conditions. The following ten single metals: Cd, Co, Cr(III, VI), Cu, Fe, Hg, La, Ni, Pb, and Zn, are the main focus of most of the equilibrium data (507) in more than half of the studied references. The studies reflecting the interaction of nine of these metals with Sargassum sp. is described and analyzed. The use of Langmuir equation, the effect of temperature and pH on sorption is critically reviewed. In addition, we also analyze all the data available on elemental chemical composition of native Sargassum. These data reflect the interaction of this kind of marine biomass with nine of the metals mentioned above, which are present in seawater worldwide.
    Type: Book chapter , NonPeerReviewed
    DOI: 10.1016/B978-0-12-818305-2.00042-5
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    OceanRep: Book chapter
  • 4
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    Utilization of seaweed waste: Biosorption of toxic compounds onto invasive seaweed and seaweed wastes (2020)
    Elsevier
    In:  In: Sustainable Seaweed Technologies. , ed. by Torres, M. D., Kraan, S. and Dominguez, H. Elsevier, Amsterdam, Netherlands, pp. 613-639, 27 pp. ISBN 978-0-12-817943-7
    Details
    Publication Date: 2021-01-11
    Description: The concept of biosorption results from the “passive” (nonmetabolic) interaction of a chemical species with a particle of a biological material. This interaction can be practically exploited, for example, for removal of toxic substances of wastewaters or for the enrichment of a fertilizer with micronutrients. In this work, equilibrium and dynamic data obtained with “low-cost” biomaterials of algal waste or invasive seaweed species have been reviewed and critically analyzed in the context of a circular economy. The concept of a biosorption unit, oriented to the valorization of any solid residual material of algal biomass, can be considered as a real possibility in a biorefinery process; but to accomplish this goal it is necessary that the emphasis on research must definitely move from laboratory scale toward pilot plant assays.
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1016/B978-0-12-817943-7.00021-4
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  • 5
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    The proton binding properties of biosorbents (2019)
    Springer
    In:  Environmental Chemistry Letters, 17 (3). pp. 1281-1298.
    Details
    Publication Date: 2022-01-31
    Description: A broad variety of materials of biological origin have been successfully used in recent decades for the removal of pollutants from waters. These biosorbents include natural polymers that play a key role for adsorption. It is therefore critical to understand the physicochemical properties of the chemical groups of these biopolymers. The acid–base properties of biomass are affected by pH, ionic strength and medium composition. Nevertheless, these parameters are not always considered during biosorption studies. According to the literature, less than 3% of biosorption reports include studies on proton binding. Moreover, in 60% of these papers, there is key experimental information missing such as the calibration of the electrodes employed for potentiometric titrations. We consider therefore that there is an important need for reviewing the role of proton binding in biosorption studies. This review outlines the major advances on data interpretation and modelling of proton binding on biosorbents. In addition, we discuss issues concerning the acid–base properties of biosorbents.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10311-019-00883-z
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Antioxidant Capacity Assessment of Plant Extracts for Green Synthesis of Nanoparticles (2021)
    MDPI
    Details
    Publication Date: 2024-02-07
    Description: In this work, water extracts from different bio-based products of plant origin were studied to evaluate their antioxidant capacity and their potential to form metal nanoparticles from aqueous solutions. Two traditional tests, the Folin–Ciocalteu assay and the DPPH radical scavenging capacity method were compared with a more recent one, SNPAC, based on the formation of silver nanoparticles. The silver nanoparticle antioxidant capacity method (SNPAC) was optimized for its application in the characterization of the extracts selected in this work; kinetic studies and extract concentration were also evaluated. The extracts were obtained from leaves of oak, eucalyptus, green tea, white and common thyme, white cedar, mint, rosemary, bay, lemon, and the seaweed Sargassum muticum. The results demonstrate that any of these three methods can be used as a quick test to identify an extract to be employed for nanoparticle formation. Additionally, we studied the synthesis of Cu, Fe, Pb, Ni, and Ag nanoparticles using eucalyptus extracts demonstrating the efficiency of this plant extract to form metallic nanoparticles from aqueous metal salt solutions. Metal nanoparticles were characterized by transmission electron microscopy and dynamic light scattering techniques.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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