The emission of highly-toxic gaseous AsO (AsO (g)) from nonferrous metal smelting poses environmental concerns. In this study, we prepared an adsorbent (SIL-X) by loading an ionic liquid (IL) ([HOEtMI]NTf) into MCM-41 through an impregnation–evaporation process and then applied it to adsorb AsO (g). SIL-20% exhibited an AsO (g) adsorption capacity of 35.48 mg/g at 400 °C, which was 490% times higher than that of neat MCM-41. Characterization of SIL-X indicated that the IL was mainly supported on MCM-41 through O–H…O bonds formed between the hydroxyl groups (–OH) and the silanol groups (Si–OH) and the O–H…F bonds formed between the C–F groups and the Si–OH groups. The hydrogen bonds significantly contributed to the adsorption of AsO (g), with –NH and –OH groups forming hydrogen bonds with As–O species (i.e., N–H…O and O–H…O). This showed superior performance to traditional adsorbents that rely on van der Waals forces and chemisorption. Moreover, after exposure to high concentrations of SO, the adsorption capacities remained at 76% of their initial values, demonstrating some sulfur resistance. This study presents an excellent adsorbent for the purification of AsO (g) and shows promising application potential for treating flue gas emitted by nonferrous metal smelting processes.

中文翻译：

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二氧化硅负载的离子液体通过氢键有效去除气态砷氧化物


有色金属冶炼过程中排放剧毒气体AsO（AsO（g））引起环境问题。在本研究中，我们通过浸渍-蒸发过程将离子液体（IL）（[HOEtMI]NTf）负载到MCM-41中制备了吸附剂（SIL-X），然后将其用于吸附AsO（g）。 SIL-20% 在 400 °C 时的 AsO (g) 吸附容量为 35.48 mg/g，比纯 MCM-41 高 490% 倍。 SIL-X 的表征表明，IL 主要通过羟基 (-OH) 和硅烷醇基 (Si-OH) 之间形成的 O-H…O 键以及形成的 O-H…F 键负载在 MCM-41 上介于 C-F 基团和 Si-OH 基团之间。氢键对 AsO (g) 的吸附有显着贡献，其中 –NH 和 –OH 基团与 As–O 物质形成氢键（即 N–H…O 和 O–H…O）。这显示出优于依赖范德华力和化学吸附的传统吸附剂的性能。此外，暴露于高浓度 SO 后，吸附容量仍保持在初始值的 76%，表现出一定的抗硫性。这项研究提出了一种用于纯化 AsO (g) 的优异吸附剂，并在处理有色金属冶炼过程排放的烟气方面显示出广阔的应用潜力。