Abstract
This research aimed to modify of diatomite and leonardite for adsorption of hydrogen sulfide (H2S) gas. The effect of chemical loading on surface modification was studied. Natural diatomite and leonardite were obtained through the natural deposits in Lampang Province, Thailand. Diatomite and leonardite were modified using chemical methods with calcination at 450 °C. The chemical composition and phase structure of adsorbents were characterized by X–Ray fluorescence spectroscopy (XRF) and X–ray diffraction (XRD), respectively. The morphology and disperse energy of the elements were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The functional group was identified by Fourier transform infrared spectroscopy (FT–IR). The efficiency of adsorption of H2S gas was studied. H2S gas in this study was synthesized by the chemical reaction between sodium sulfide (Na2S) and sulfuric acid (H2SO4). The concentration of hydrogen sulfide was measured by an H2S gas detector. The performance of the modified diatomite and leonardite for adsorption of H2S was compared. It was found that modified diatomite has better efficiency than modified leonardite for the adsorption of H2S gas. After modification process, the adsorption efficiency increased while the adsorption time decreased.
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