[10a-N324-1~11] 8.5 Plasma phenomena, emerging area of plasmas and their new applications

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[10a-N324-7] Exploring plasma-driven sulfonation mechanisms in sulfuric acid solution: radical generation pathways

〇SIQI DENG^1,2, Shota Sasaki¹, Toshiro Kaneko¹, Nozomi Takeuchi² (1.Grad. Sch. of Eng., Tohoku Univ., 2.Science Tokyo)

Keywords:

Atmospheric-pressure plasma,Plasma carbon treatment,Reactive species

A plasma-based method for carbon sulfonation using dilute sulfuric acid was investigated, with a focus on the role of short-lived sulfate radicals in the functionalization mechanism. Hydroxyl radicals generated by DC plasma discharge were previously shown to activate sulfur species at carbon defect sites, but the involvement of sulfate radicals remains unclear. In this study, sodium persulfate was introduced as a precursor to confirm sulfate radicals as the key species in plasma sulfonation. The effects of discharge polarity and treatment time on sulfonation efficiency and catalytic activity were systematically evaluated. To directly assess sulfate radicals' behavior, an in-situ absorption diagnostic system was developed using a broadband light source and high S/N camera, enabling spatiotemporal visualization of radical distribution in the plasma–liquid interface.