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). 2023 May;127:641-651. doi: 10.1016/j.jes.2022.06.011. Epub 2022 Jun 25.
Non-thermal plasma (NTP) surface modification technology is a new method to control the surface properties of materials, which has been widely used in the field of environmental protection because of its short action time, simple process and no pollution. In this study, Cu/ACF (activated carbon fiber loaded with copper) adsorbent was modified with NTP to remove HS and PH simultaneously under low temperature and micro-oxygen condition. Meanwhile, the effects of different modified atmosphere (air, N and NH), specific energy input (0-13 J/mL) and modification time (0-30 min) on the removal of HS and PH were investigated. Performance test results indicated that under the same reaction conditions, the adsorbent modified by NH plasma with 5 J/mL for 10 min had the best removal effect on HS and PH. CO temperature-programmed desorption and X-ray photoelectron spectroscopy (XPS) analyzes showed that NH plasma modification could introduce amino functional groups on the surface of the adsorbent, and increase the types and number of alkaline sites on the surface. Brunauer-Emmett-Teller and scanning electron microscopy showed that NH plasma modification did not significantly change the pore size structure of the adsorbent, but more active components were evenly exposed to the surface, thus improving the adsorption performance. In addition, X-ray diffraction and XPS analysis indicated that the consumption of active components (Cu and CuO) and the accumulation of sulfate and phosphate on the surface and inner pores of the adsorbent are the main reasons for the deactivation of the adsorbent.
非热等离子体（NTP）表面改性技术是一种控制材料表面性能的新方法，由于其作用时间短、工艺简单、无污染，已广泛应用于环境保护领域。本研究采用 NTP 对 Cu/ACF（载铜活性炭纤维）吸附剂进行改性，在低温、微氧条件下同时去除 HS 和 PH。同时，考察了不同改性气氛（空气、N 和 NH）、比能量输入（0-13 J/mL）和改性时间（0-30 min）对 HS 和 PH 去除效果的影响。性能测试结果表明，在相同反应条件下，NH 等离子体以 5 J/mL 改性 10 min 的吸附剂对 HS 和 PH 的去除效果最佳。CO 程序升温脱附和 X 射线光电子能谱（XPS）分析表明，NH 等离子体改性可在吸附剂表面引入氨基官能团，增加表面的碱性位类型和数量。BET 和扫描电子显微镜表明，NH 等离子体改性并未显著改变吸附剂的孔径结构，但更多的活性成分均匀暴露在表面，从而提高了吸附性能。此外，X 射线衍射和 XPS 分析表明，活性成分（Cu 和 CuO）的消耗以及硫酸盐和磷酸盐在吸附剂表面和内孔中的积累是吸附剂失活的主要原因。
