Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, China.
J Environ Sci (China). 2025 Feb;148:476-488. doi: 10.1016/j.jes.2023.09.023. Epub 2023 Sep 25.
In this study, non-thermal plasma (NTP) was employed to modify the Cu/TiO adsorbent to efficiently purify HS in low-temperature and micro-oxygen environments. The effects of Cu loading amounts and atmospheres of NTP treatment on the adsorption-oxidation performance of the adsorbents were investigated. The NTP modification successfully boosted the HS removal capacity to varying degrees, and the optimized adsorbent treated by air plasma (Cu/TiO-Air) attained the best HS breakthrough capacity of 113.29 mg HS/g, which was almost 5 times higher than that of the adsorbent without NTP modification. Further studies demonstrated that the superior performance of Cu/TiO-Air was attributed to increased mesoporous volume, more exposure of active sites (CuO) and functional groups (amino groups and hydroxyl groups), enhanced Ti-O-Cu interaction, and the favorable ratio of active oxygen species. Additionally, the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results indicated the main reason for the deactivation was the consumption of the active components (CuO) and the agglomeration of reaction products (CuS and SO) occupying the active sites on the surface and the inner pores of the adsorbents.
在这项研究中，非热等离子体（NTP）被用于修饰 Cu/TiO 吸附剂，以在低温和微氧环境下高效净化 H2S。考察了 Cu 负载量和 NTP 处理气氛对吸附剂吸附-氧化性能的影响。NTP 修饰成功地在不同程度上提高了 H2S 的去除能力，经空气等离子体处理的优化吸附剂（Cu/TiO-Air）的 H2S 穿透容量达到了 113.29mg H2S/g，几乎是未经 NTP 修饰的吸附剂的 5 倍。进一步的研究表明，Cu/TiO-Air 的优异性能归因于增加的中孔体积、更多暴露的活性位（CuO）和官能团（氨基和羟基）、增强的 Ti-O-Cu 相互作用以及有利的活性氧物种比例。此外，X 射线衍射（XRD）和 X 射线光电子能谱（XPS）结果表明，失活的主要原因是活性成分（CuO）的消耗以及反应产物（CuS 和 SO）的团聚占据了吸附剂表面和内部孔道中的活性位。
