Desulfurization (deS) material is usually deactivated because elemental sulfur formed during deS and covers the material surface. In this study, a novel strategy was proposed for a continuous oxidization of hydrogen sulfide (H2S) by a sewage sludge-derived adsorbent without elemental-sulfur deposition. At temperatures <180°C, the sludge-derived adsorbent was deactivated and showed limited deS amount of 0.27 mmol/g at 60 min. Scanning Electron Microscope (SEM) and Fourier Transform infrared spectroscopy showed that carbon sites of the deactivated adsorbent were covered by elemental sulfurs. After the deactivated adsorbent was regenerated at 200°C, it showed a deS amount of 0.25 mmol/g again. On the contrary, at temperatures >180°C, the adsorbent achieved a stable deS without deactivation, resulting in a deS amount of 121.82 mmol/g at 20 h. In this case, yellow particles evolved from the adsorbent. X-ray diffraction and Thermogravimetric Analysis both proved that the particles were sulfur. Sulfur outflow was a key factor determining the regeneration of active carbon sites and continuous oxidization of H2S. This study will help the development of a low-cost adsorbent for H2S purification.
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