The shell of Swietenia mahagoni was modified using sulfuric acid and ortho-phosphoric acid to improve the adsorption
capacity for the removal of hexavalent chromium from aqueous solutions. The adsorbent characterization
was done by using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM),
energy-dispersive X-ray spectroscopy (EDS) and thermogravimetric analysis (TGA)