Heat/PMS Degradation of Atrazine: Theory and Kinetic Studies

The degradation effect of heat/peroxymonosulfate (PMS) on atrazine (ATZ) is studied. The results show that the heat/PMS degradation for ATZ is 96.28% at the moment that the phosphate buffer (PB) pH, temperature, PMS dosage, ATZ concentration, and reaction time are 7, 50 degrees C, 400 mu mol/L, 2.5 mu mol/L, and 60 min. A more alkaline PB is more likely to promote the breakdown of ATZ through heat/PMS, while the PB alone has a more acidic effect on the PMS than the partially alkaline solution. HO center dot and SO4-center dot coexisted within the heat/PMS scheme, and ATZ quantity degraded by HO center dot and SO4-center dot in PB with pH = 7, pH = 1.7 similar to 1. HCO3- makes it difficult for heat/PMS to degrade ATZ according to inorganic anion studies, while Cl- and NO3- accelerate the degradation and the acceleration effect of NO3- is more obvious. The kinetics of ATZ degradation via heat/PMS is quasi-first-order. Ethanol (ETA) with the identical concentration inhibited ATZ degradation slightly more than HCO3-, and both of them reduced the degradation rates of heat/PMS to 7.06% and 11.56%. The addition of Cl- and NO3- increased the maximum rate of ATZ degradation by heat/PMS by 62.94% and 189.31%.