Enhanced Hydrothermal Decomposition of Ammonium Sulfate by Using Sodium Peroxydisulfate

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  • 過硫酸ナトリウムを用いた硫酸アンモニウムの湿式促進酸化分解
  • カリュウサン ナトリウム オ モチイタ リュウサン アンモニウム ノ シッシキ ソクシン サンカ ブンカイ

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Abstract

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.<br>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.<br>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.

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