Descripción del proyecto
Eliminar los contaminantes del agua utilizando nanopartículas de magnetita
Los agregados artificiales de (hidro)óxidos de hierro introducidos en el agua contaminada se unen a las partículas en suspensión y se depositan en el fondo del fluido, permitiendo que se eliminen los contaminantes. Estos sistemas, producidos en reactores de flujo, han demostrado una retención satisfactoria del selenio y el arsénico. En el proyecto REPONANO, financiado con fondos europeos, se revelará más acerca del potencial de las nanopartículas de magnetita para inmovilizar diversos contaminantes, incluidos el cromo, el antimonio y el uranio. Los agregados de nanopartículas se revestirán de polietilenglicol. Una mejor comprensión de las propiedades físicas y químicas de tales agregados artificiales puede servir de base para el estudio de técnicas alternativas de recuperación con respecto a la contaminación de las aguas potables y residuales.
Objetivo
Iron (hydr)oxides are widely considered as important factors for the immobilisation of many contaminants, while their nano-scale counterparts offer greater retention capacity. Successful immobilisation of contaminants is documented, for instance, via nanomagnetite, although this solid is far less studied compared to other Fe oxides. Soil aggregates are natural systems ideal for the study of the (bio)geochemical reactions that control the mobility of the redox sensitive elements due to their small size and their spatial heterogeneity. The reduction of contaminants by Fe (hydr)oxides using artificial aggregate systems has been studied via experimental set ups that mimic the field conditions, showing the great retention potential of important toxic pollutants. These systems have been originally developed in a macro-scale via flow-through reactors using constructed aggregates coated with ferryhydrite and indicated the successful retention of Se and As. Thus, the purpose of the present study is to use those systems in a micro-scale edition via the use of microfluidics and PEG aggregates in order to study the nanomagnetite immobilisation potential of various contaminated systems (i.e. Se, As, Cr, Sb, U). We aim to obtain Break Through Curves (BTC) of the contaminants of interest to investigate the spatial distribution of the phases produced by nanomagnetite reduction and to assess all the driving geochemical and physical processes. Micro X-Ray Tomography (SR-CT) and µXAS will be applied for the first time to such experimental systems, offering a 3D description of the various species present in these aggregates. A numerical (3D) reactive transport model will be, also, used to interpretate the time-resolved data obtained in such a natural system and to set up new water treatments based on such macroscopic devices. We aim to provide innovative insights and set the basis for alternative remediation techniques with respect to drinking and waste water contamination worldwide.
Ámbito científico
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural.
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural.
Palabras clave
Programa(s)
Régimen de financiación
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinador
38058 Grenoble
Francia