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This article describes the structural characterization of the husk of modified rice through the process of advanced oxidation with the reagent Fenton; the transformation was carried out with the intention of increasing the number of active sites on the material’s surface, and consequently to generate an absorbent with a greater capacity for the removal of Cr (VI) ions in solution, compared to the husk of natural rice. The characterization of modified material was determined through distinct experimental techniques that include the analysis of the functional groups present on the absorbent’s surface through infrared spectroscopy with diffuse reflectance, (DRIFT), likewise, a surface morphology analysis of the husk through a scanning electron microscope (SEM), a compositional analysis and thermogavimetric (TGA). All of these tests were carried out before and after the modification process. The results of the DRIFT point towards a slight shift and attenuation in the vibration frequencies of the functional groups implicated in the structural modification, whereas the SEM analysis indicated noticeable changes in the morphology of the absorbent material. Meanwhile, the compositional analysis showed considerable changes in the percentage of the material components, whose presence was confirmed through the TGA analysis, after decomposing at the expected temperatures. In short, all results confirm the structural modification of the absorbent tested.

Caracterización estructural de la cascarilla de arroz modificada como adsorbente alternativo y eficiente para la remoción de Cr (VI) en solución