
handle: 10261/148861
[ES]: El desarrollo de adsorbentes basados en materiales naturales para inmovilizar contaminantes en suelos es un área de gran interés, por su creciente necesidad. Mediante la interacción de dos arcillas naturales esmectíticas (SWy-2 y Bailén), una hidrotalcita sintética (HT) y su producto de calcinación (HT500) con la materia orgánica soluble (MOS) de un alperujo se obtienen bioadsorbentes, que puedan emular al complejo organo-mineral del suelo y así ser utilizados como enmendantes naturales para disminuir la movilidad de contaminantes orgánicos en suelos.Se prepararon quatroadsorbentes, se caracterizaron y se ensayaron frente a quatro contaminantes: tres- herbicidas (diurón, terbutilazina y terbutrina) y el dibenzofurano y su posible formación in situ. Estos bioadsorbentes presentaron un aumento en la adsorción de contaminantes de entre el 90 y el 4%, dependiendo de la arcilla y el contaminante, respecto a las materias primas. Los compuestos más hidrófobos (dibenzofurano y terbutrina) y las bioesmectitas muestran los mejores resultados por penetración interlaminar de la MOS. La enmienda previa de un suelo con las arcillas originales seguida de la adición del contaminante en presencia de la MOS de alperujo muestra un gran aumento de la retención de terbutrina y dibenzofurano en el suelo, evidenciando la formación in situ de estos adsorbentes.
[EN]: The development of sorbents based on natural materials to immobilize pollutants in soils is an area of great interest, because of its growing need. Through the interaction of two natural smectitic clays (SWy-2 and Bailén), a synthetic hydrotalcite (HT) and its product of calcination (HT500) with the soluble organic matter (MOS) of an olive mill waste (alperujo) we obtained biosorbents, which can emulate the organo-mineral complex of soil and thus be used as natural amendments to reduce the mobility of organic pollutants in soils. Four sorbents were prepared, characterized and assayed against four contaminants: three herbicides (diuron, terbuthylazine and terbutryn) and dibenzofuran and its possible formation in situ. These biosorbents showed an increase in the adsorption of contaminants between 90 and 4%, depending on the clay and the contaminant, with respect to the raw materials. The more hydrophobic compounds (dibenzofuran and terbutryn) and the biosmectites displayed better performance by penetration of the MOS in the interlayer space of the clays. Amendment of soil with the original clays followed by addition of the contaminant in the presence of the MOS of alperujo showed a large increase of terbutryn and dibenzofuran retention in soil, evidencing the in situ formation of these adsorbents.
4 páginas.-- 2 figuras.-- 1 tabla.-- 7 referencias:-- Comunicación presentada en el "VII Congresso Ibérico das Ciências do Solo (CICS 2016)" y "VI Congresso Nacional de Rega e Drenagem" que decorreu no Instituto Politécnico de Beja de 13 a 15 de Setembro de 2016.
Proyectos P07-AGR-03077, P11-AGR-07400 y AGR-264 de la Junta de Andalucía (Programas FEDER-FSE de la UE) y Convenio RECUPERA 2020 del MINECO-CSIC
Peer Reviewed
Smectites, Herbicides, Hydrotalcite, Dibenzofuran, Adsorption
Smectites, Herbicides, Hydrotalcite, Dibenzofuran, Adsorption
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