Adsorption–Desorption Behavior of Hydrogen Sulfide Capture on a Modified Activated Carbon Surface

Metal-based adsorbents with varying active phase loadings were synthesized to capture hydrogen sulfide (H(2)S) from a biogas mimic system. The adsorption–desorption cycles were implemented to ascertain the H(2)S captured. All prepared adsorbents were evaluated by nitrogen adsorption, Brunauer–Emmett–Teller surface area analysis, scanning electron microscopy–energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. From the results, modified adsorbents, dual chemical mixture (DCM) and a core–shell (CS) had the highest H(2)S adsorption performance with a range of 0.92–1.80 mg H(2)S/g. After several cycles of heat/N(2) regeneration, the total H(2)S adsorption capacity of the DCM adsorbent decreased by 62.1%, whereas the CS adsorbent decreased by only 25%. Meanwhile, the proposed behavioral model for H(2)S adsorption–desorption was validated effectively using various analyses throughout the three cycles of adsorption–desorption samples. Moreover, as in this case, the ZnAc(2)/ZnO/CAC_OS adsorbents show outstanding performances with 30 cycles of adsorption–desorption compared to only 12 cycles of ZnAc(2)/ZnO/CAC_DCM. Thus, this research paper will provide fresh insights into adsorption–desorption behavior through the best adsorbents’ development and the adsorbents’ capability at the highest number of adsorption–desorption cycles.