Fe(Ⅵ)/Na<sub>2</sub>SO<sub>3</sub>体系降解阿特拉津效能

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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 CO₃^2- 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.

Key words： atrazine ferrate Na₂SO₃ degradation efficiency sulfate radical

Received: 15 May 2020

PACS:

X703.1

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	Articles by authors
	SUN Shao-fang
	LI Jia-long
	QIU Qi
	QIU Li-ping
	MA Jun
	LIU Cai-hong

Cite this article:

SUN Shao-fang,LI Jia-long,QIU Qi等. Degradation efficiency of atrazine by Fe(VI)/Na₂SO₃ system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 192-198.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/192

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