Gabriela C. Silva

TL;DR: In this paper, a magnetic composite was synthesized through the precipitation of manganese oxide in the presence of magnetite particles using O2 as an oxidant, which proved to be chemically and physically stable within a wide range of pH values.

TL;DR: XANES results for the composite after As(III) removal tests show that the As adsorbed is at the oxidized arsenic form, As(V).

TL;DR: In this article, specific interactions among arsenic, iron and a vegetable biomass are investigated with a view to demonstrate how these interactions can affect arsenic mobility in the environment, and the results demonstrate that carboxylic acid groups can affect AsV mobility so long as iron is available for bridging.

TL;DR: In this article, the accumulation of iron and arsenic from aqueous solution by lettuce leaves biomass was investigated using Mossbauer and EXAFS spectroscopic techniques, and the results showed that iron is oxidized during sorption while exascale results indicated that iron was coordinated by approximately 6 oxygen and 2 carbon atoms while arsenic is coordinated by 4 oxygen atoms with iron as a second neighbor.

TL;DR: In this paper, the authors present a brief description of the X-rays absorption phenomenon and the analytical technique involving this phenomenon, as well as the application of XAFS in biosorption studies.