Harianingsih, Nuni Widiarti, Vera Noviana Sulistyawan, Maharani Kusumaningrum, Indra Sakti Pangestu, Muhammad Rizky Fahrizal Putra, Afifah Ritmadanti, Sofi Alifia Hidyus, Solomon Jalang Achiek Jalang, Tonni Agustiono Kurniawan
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 Fe , 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. © 2025, Semarak Ilmu Publishing. All rights reserved.
Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang, Sekaran Gunungpati, Semarang, 50229, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Semarang, Sekaran Gunungpati, Semarang, 50029, Indonesia; Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Semarang, Sekaran Gunungpati, Semarang, 50229, Indonesia; College of Ecology and The Environment, Xiamen University, Fujian, Xiamen, 361102, China
