This study introduces a green and sustainable method for synthesising ammonium nitrate (NHNO) using plasma activated water (PAW). Nitrate ions () were generated via air plasma treatment, and ammonium ions () were introduced using low pressure ammonia (NH₃) plasma exposure to nitrate-rich PAW in frozen form to produce NHNO. Results demonstrated that process parameters, including NH₃ gas pressure, applied voltage, and treatment time, significantly influenced PAW properties, with NH₃ plasma treatment time showing the most substantial impact. Extending the treatment time from 0.5-1.5 hours increased ion concentration by 134.2%, achieving a maximum of 168.2 mg L¹ with an energy consumption of 74.8 mg ions kWh¹. The ion concentration reached 63.5 mg L¹ with an energy yield of 222 mg ions kWh¹. This method achieved a total yield of 27.6 mg NHNO kWh¹ and produced a neutral to slightly basic PAW suitable for agricultural applications, offering a promising alternative to traditional NHNO production processes.
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