Arsenite and chromate sequestration onto ferrihydrite, siderite and goethite nanostructured minerals: Isotherms from flow-through reactor experiments and XAS measurements.

摘要: Sorption isotherms remain a major tool to describe and predict the mobility of pollutants in natural anthropogenic environments, but they are typically determined by independent batch experiments. In present study, sequestration As(III), Cr(VI) competitive As(III)-Cr(VI) on/in 6L-ferrihydrite, siderite goethite nanostructured minerals was reinvestigated using stirred flow-through reactor Herein, sorption were particularly from breakthrough curves for inert reactive tracers monitored simultaneously single percolation experiment. complement, X-ray absorption spectroscopy (XAS) used identify As sites on 6L-ferrihydrite goethite. expected, have high potential remove Cr water (siderite = ferrihydrite (about 60 mg/g) > (20 mg/g)). modelled with Langmuir model, sigmoidal Hill model case sorption. XAS measurements revealed that As(III) partially oxidized (up 22%) system chromate oxyanion Cr(VI). sorbed ferrihydrite adopted edge-sharing corner sharing complex geometries. Nowadays, new class adsorbing phases is being developed wastewater treatment, including engineered materials nanocomposites. The use flow through experiments as throughput method, combined XAS, should be considered efficient screening methods test their sorbing properties various contaminants.