Degradation efficiency of atrazine by Fe(VI)/Na2SO3 system
SUN Shao-fang1,2, LI Jia-long1,2, QIU Qi3, QIU Li-ping1,2, MA Jun4, LIU Cai-hong5
1. School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China; 2. Shandong Province Engineering Technology Research Center for Water Purification Functional Material, Jinan 250022, China; 3. School of Conservancy and Environment, University of Jinan, Jinan 250022, China; 4. School of Environment, Harbin Institute of Technology, Harbin 150090, China; 5. College of Environment and Ecology, Chongqing University, Chongqing 400044, China
Abstract：The degradation efficiency of atrazine (ATZ) by Na2SO3 activated with potassium ferrate (K2FeO4) was studied. The primary reactive species formed in Fe(VI)/sulfite system were identified. In addition, the influences of dosages of sulfite, solution pH as well as water background matrices including humic acid (HA), Cl-, and CO32- on the transformation efficiency of ATZ in Fe(VI)/sulfite process were evaluated. The results showed that 74.4% of ATZ was transformed by the combination of 50μmol/L Fe(VI) and 200μmol/L Na2SO3 at 10s, while only 10.2% and 7.5% of ATZ was removed at 60s by individual Fe(VI) and Na2SO3, respectively, under similar conditions. Sulfate radicals (SO4·-) was responsible for the degradation of ATZ based on the results of radical probe compound and dissolved oxygen experiments. In the presence of 50μmol/L Fe(VI) and at pH=8, the degradation efficacy of ATZ firstly increased, then decreased with increasing the dosage of Na2SO3, in which the optimal concentration of Na2SO3 was 150~200μmol/L. The enhanced degradation of ATZ by Fe(Ⅵ)/Na2SO3 system was observed in the pH range of 7~10. The removal of ATZ in natural water by Fe(VI)/sulfite process was also confirmed, but with lower efficiency compared to synthetic water, mainly resulting from the competition of SO4·- by water background matrix.
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