In this work, rice husk-derived hierarchical porous carbon (HPC) was developed as a high-performance adsorbent for ethyl mercaptan removal. Various characterization methods were used to comprehensively characterize the HPC adsorbent. HPC-2 exhibited an adsorption capacity of 118.1 mg/g for ethyl mercaptan at 500 ppm and a space velocity of 12000 h⁻1, outperforming similar materials reported previously. The high adsorption capacity was attributed to the material’s well-developed microporosity and the abundance of hydroxyl groups (–OH) on its surface, facilitating the chemisorption of ethyl mercaptan. Given the chemically adsorbed nature of sulfur compounds, N₂ thermal regeneration was insufficient to fully recover the adsorbent’s performance. However, oxidative regeneration using O₂/N₂ (3/97 v/v) at 250 °C successfully removed these compounds and restored desulfurization efficiency, likely due to oxygen-assisted reactions on the adsorbent surface. This study provides valuable insights for effectively treating sulfur-containing odorous gases in the air.

中文翻译：

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乙硫醇在稻壳多级多孔碳上的高效吸附


在这项工作中，开发了稻壳衍生的多级多孔碳 （HPC） 作为去除乙硫醇的高性能吸附剂。采用多种表征方法对 HPC 吸附剂进行了全面表征。HPC-2 在 500 ppm 和 12000 ^h-1 空速下对乙硫醇的吸附容量为 118.1 mg/g，优于以前报道的类似材料。高吸附能力归因于该材料发达的微孔性和其表面丰富的羟基 （-OH），促进了乙硫醇的化学吸附。鉴于硫化合物的化学吸附性质，N₂ 热再生不足以完全恢复吸附剂的性能。然而，在 250 °C 下使用 O₂/N₂ （3/97 v/v） 进行氧化再生成功去除了这些化合物并恢复了脱硫效率，这可能是由于吸附剂表面的氧辅助反应。这项研究为有效处理空气中含硫的恶臭气体提供了有价值的见解。