合成了一系列MgFe₂O₄基改性球形活性炭吸附剂,用于室温下去除加湿空气中的H₂S,同时研究了孔隙结构对吸附性能的影响。通过SEM-EDS、氮气吸附-脱附和XRD对材料进行表征。结果表明,样品MFOR2-20对H₂S的吸附性能最好,达到204 mg/mL(571 mg/g);脱硫过程中形成的FeOOH作为中间体起到催化作用;产物包括单质硫和硫酸盐。H₂S的脱除包括吸附和催化氧化2种方式,H₂S的催化氧化一直持续到催化剂的所有有效孔被氧化产物堵塞。较小的孔隙可以增强催化剂的分散性、提供吸附中心并储存氧化产物。

A series of MgFe₂O₄-based modified spherical activated carbon absorbents are synthesized to remove H₂S from humidified air at room temperature.The influence of pore structure on adsorption performance is studied.The catalysts are characterized through SEM-EDS,nitrogen adsorption-desorption,and XRD.Results show that MFOR2-20 sample shows the best adsorption performance for H₂S,reaching 204 mg·mL^-1 or 571 mg·g^-1.FeOOH formed as an intermediate in the desulfurization process plays a catalytic role.Desulfurization products include elemental sulfur and sulfates.Removal of H₂S includes two routines:adsorption and catalytic oxidation.Catalytic oxidation of H₂S continues until all the effective pores of the catalyst are blocked by the oxidation products.Smaller pores can enhance the dispersion of the catalyst,provide adsorption centers and store oxidation products.

陈铭(1998-),男,硕士生,研究方向为活性炭吸附,chenming19980815@163.com;梁晓怿(1973-),男,博士,教授,研究方向为炭纤维及其复合材料的制备及应用研究,通讯联系人,xyliang@ecust.edu.cn。