Adsorption-oxidation of hydrogen sulfide on Fe/walnut-shell activated carbon surface modified by NH3-plasma

• Published in: Journal of environmental sciences (China) Vol. 64; no. 2; pp. 216 - 226
• Main Authors: Ning, Ping, Liu, Sijian, Wang, Chi, Li, Kai, Sun, Xin, Tang, Lihong, Liu, Gui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2018
• Subjects: Dielectric barrier discharge; Fe/walnut-shell activated carbon (Fe/WSAC); Hydrogen sulfide; Non-thermal plasma; Surface modification; 吸附氧化;表面性质;硫化物;修改;激活;血浆;NH3;Fourier; Hydrogen sulfide; Fe/walnut-shell activated carbon (Fe/WSAC); Surface modification; Non-thermal plasma; Dielectric barrier discharge
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/j.jes.2017.06.017

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 for10 min and 6.8 k V output（30 V input voltage） maintained 100% H2 S conversion over a long reaction time of 390 min. 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 of0.4, 0.5 and 0.75 nm. XPS revealed that chemisorbed oxygen changed into lattice oxygen after NTP treatment, and lattice oxygen is beneficial for H2 S 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 H2 S adsorption-oxidation.