Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China.
J Environ Sci (China). 2018 Feb;64:216-226. doi: 10.1016/j.jes.2017.06.017. Epub 2017 Jun 29.
Walnut-shell activated carbon (WSAC) supported ferric oxide was modified by non-thermal plasma (NTP), and the removal efficiency for hydrogen sulfide over Fe/WSAC modified by dielectric barrier discharge (DBD) was significantly promoted. The sample modified for 10min and 6.8kV output (30V input voltage) maintained 100% HS conversion over a long reaction time of 390min. The surface properties of adsorbents modified by NTP under different conditions were evaluated by the methods of X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis and in-situ Fourier transform infrared spectroscopy (FTIR), to help understand the effect of the NTP treatment. NTP treatment enhanced the adsorption capacity of Fe/WSAC, which could due to the formation of micro-pores with sizes of 0.4, 0.5 and 0.75nm. XPS revealed that chemisorbed oxygen changed into lattice oxygen after NTP treatment, and lattice oxygen is beneficial for HS oxidation. From the in-situ FTIR result, transformation of the reaction path on Fe/WSAC was observed after NTP modification. The research results indicate that NTP is an effective method to improve the surface properties of the Fe/WSAC catalyst for HS adsorption-oxidation.
核桃壳活性炭（WSAC）负载氧化铁经非热等离子体（NTP）改性后，用于去除硫化氢的效率显著提高。在 30V 输入电压下，经 6.8kV 输出（10min）处理的样品在 390min 的长时间反应中保持了 100%的 HS 转化率。通过 X 射线光电子能谱（XPS）、BET 分析和原位傅里叶变换红外光谱（FTIR）等方法评估了不同条件下 NTP 改性吸附剂的表面特性，以帮助了解 NTP 处理的效果。NTP 处理增强了 Fe/WSAC 的吸附能力，这可能是由于形成了 0.4、0.5 和 0.75nm 的微孔。XPS 表明，NTP 处理后化学吸附氧转化为晶格氧，而晶格氧有利于 HS 的氧化。从原位 FTIR 的结果可以看出，NTP 改性后 Fe/WSAC 的反应路径发生了转变。研究结果表明，NTP 是一种有效提高 Fe/WSAC 催化剂表面性能用于 HS 吸附-氧化的方法。
