Journal
CHEMOSPHERE
Volume 181, Issue -, Pages 627-634Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.04.071
Keywords
Hydrotalcite; Sorption; Desorption; Selenite; Selenate; Hysteresis; Mobilization factor
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Brasilia, Brazil) [309927/2015-3, 304066/2015-0]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES, Brasilia, Brazil)
- Fundacao Araucaria (Curitiba, Brazil)
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Selenate and selenite are considered emerging contaminants and pose a risk to living organisms. Since selenium anion species are at low concentration in aquatic environments, materials for its retention are required to enable monitoring. Herein, hydrotalcite was calcined and characterised to investigate sorption and desorption of selenite and selenate in competition with nitrate, sulfate and phosphate. Sorption experiments were carried out in batch system and desorption by sequential dilution. Selenite and selenate concentration remaining after N desorption steps was determined by mass balance. The isotherms were adjusted to the dual-mode Langmuir-Freundlich model (R-2 > 0.99). Maximum sorption capacity ranged from 494 to 563 meq kg(-1) for selenite and from 609 to 659 meq kg(-1) for selenate. Sulfate and phosphate ions showed greater competitive effect on the sorption of selenate and selenite, respectively. Low mobilization factors and high sorption efficiency (MF<3%; SE approximate to 100%) indicated that calcined hydrotalcite has the wanted characteristics for retention of relevant selenium anion species in aqueous media. (C) 2017 Elsevier Ltd. All rights reserved.
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