Abstract
Plasma electrolysis offers an environmentally friendly approach to nitrate synthesis. This study aimed to investigate the effect of Fe²⁺ ion addition on the formation of reactive oxygen and nitrogen species (RONSs) and nitrate production under controlled initial pH conditions (pH = 6). The experiment utilized a plasma electrolysis reactor with a 0.02 M K₂SO₄ electrolyte, an air flow rate of 0.8 L/min, Fe²⁺ ions at a concentration of 30 ppm, and a temperature of 60°C. Nitrate production was measured using a UV-VIS spectrophotometer, while RONSs emission intensity was analyzed using an electron spin resonance (ESR). The results showed that with and without the addition of Fe²⁺ ions accelerated the pH drop from 6 to 3 in just 60 minutes. Nitrate production increased significantly with Fe²⁺, reaching 2432 ppm compared to 2046 ppm without Fe²⁺. RONSs emissions without Fe²⁺ included •OH (306 nm), •H (654 nm), •O (844 nm), N₂ (317 nm), N₂⁺ (416 nm), and N (777 nm). With Fe²⁺ addition, the emission intensities of these species remained consistent, indicating the role of Fe²⁺ in enhancing nitrate production without significantly altering RONSs profiles.
Published Version
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