Enhanced Hydrothermal Decomposition of Ammonium Sulfate by Using Sodium Peroxydisulfate

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In this work, wet oxidative decomposition of (NH4)2SO4 in an air and Ar atmosphere was conducted in a lab-scale airtight glass vessel reactor by adding Na2S2O8 and H2O2 as oxidative agents to (NH4)2SO4 solution. The initial concentration of NH4+ in (NH4)2SO4 aqueous solution was set to 1,000 mg-NH4+/dm3. The experiments were conducted at temperatures of 343–363 K, keeping the initial pH at a prescribed value between 5.5 and 13.5. The mixing molar ratio of (NH4)2SO4/oxidant was set to 1/1 – 1/10.Results show that the decomposition of (NH4)2SO4 by Na2S2O8 in an alkaline region was more significant than that by H2O2 because most H2O2 disappeared by self-decomposition under the present conditions. Results further showed that (NH4)2SO4 was almost decomposed completely in about 150 min reaction time by adding Na2S2O8 at a molar ratio of (NH4)2SO4/Na2S2O8=1/3 at 363 K in an alkaline condition of pH=13.5. The rates of decomposition of Na2S2O8 and (NH4)2SO4 were expressed by the first-order kinetics with respect to the concentrations of Na2S2O8 and (NH4)2SO4 with constant initial concentrations of (NH4)2SO4 and Na2S2O8, respectively.When Na2S2O8 was added to (NH4)2SO4 solution, NH3(aq) was decomposed by reactive oxygen species such as • SO4−, • OH−, • O−, • O3−, etc. in an alkaline condition, producing the main reaction product of N2 and small amounts of NO2− and NO3− by-products. In this oxidative decomposition of (NH4)2SO4, O2 formation was suppressed by the consumption of these reactive oxygen species.

Enhanced Hydrothermal Decomposition of Ammonium Sulfate by Using Sodium Peroxydisulfate

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