Chiang Mai Journal of Science

     Hydrogen sulfi de (H₂S) is one of the most common pollutants found in natural gas and industrial waste. Over the few decades, the removal of H₂S has become a signifi cant problem. In the field of a clean environment such as water purifi cation and toxic gas removal, graphene oxide (GO) has been found to have advantages. In this study, the influence of GO on alumina (Al₂O₃) as an adsorbent of H₂S was examined. A series of Al₂O₃/GO (AGO) composites with varying graphene oxide addition (0.5–3.0 wt%) were prepared using the high-temperature sintering method. The X-ray diffraction patterns indicate the primary phase of Al₂O₃ with hexagonal crystal structure for all AGO composites. Raman spectrometry measurements confi rmed that the GO particles were incorporated in AGO composites. The TEM image indicated that GO nanosheets were embedded between Al₂O₃ grains. The efficiency of AGO adsorbent at ambient temperature was investigated and compared with the pristine Al₂O₃ adsorbent. The AGO composites adsorbent demonstrated the H₂S breakthrough capacity in the range of 0.07–0.43 mg/g, which is higher than that of pristine Al₂O₃ (0.06 mg/g). Furthermore, the highest H₂S breakthrough capacity of 0.43 mg/g was obtained from AGO containing 3.0 wt% GO. This investigation demonstrates that the AGO adsorbent fabricated using a simple method has the potential to be used for H₂S removal at ambient temperature.