Degradation of Atrazine by UV/PMS in Phosphate Buffer
Yixin Lu 1, 2  
,   Zhangkai Ding 2  
,   Jianqiang Zhang 2  
,   Chenchen Fu 2  
,   Xinyue Xia 2  
,   Yuxiao Fang 2  
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College of Architectural and Environmental Engineering, Chengdu Technological University, Chengdu, China
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, China
Jianqiang Zhang   

Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong university
Submission date: 2018-06-07
Final revision date: 2018-08-01
Acceptance date: 2018-08-11
Online publication date: 2019-03-05
Publication date: 2019-04-09
Pol. J. Environ. Stud. 2019;28(4):2735–2744
The degradation of atrazine (ATZ) by ultraviolet/peroxymonosulfate (UV/PMS) under different conditions was investigated in phosphate buffer, and the degradation mechanism and kinetics were discussed. The results showed that the degradation rate of 2.5 μmol/L ATZ in UV/PMS system was 97.63% in 20 min when the reaction temperature was 20ºC, the concentration of PMS was 20 μmol/L and the UV intensity was 50 mW/cm2 in pH7 phosphate buffer. The mechanism analysis showed that PB with partial alkalinity promoted the degradation of ATZ by UV/PMS more than that with acidic PB. The effect of PB with alkaline conditions on the degradation of ATZ by UV/PMS was more complicated and mainly related to the state of phosphate ions. The UV/PMS system contained both HO• and SO4-•, and the ratio of HO•, SO4-•and UV-degraded ATZ was nearly 1:1 in pH7 PB. Inorganic anions experiments showed that Cl- and HCO3- inhibited the degradation of ATZ under UV/PMS, and the inhibitory effect of Cl- was more obvious. NO3- promoted the degradation of ATZ by UV/PMS. Kinetic analysis showed that UV/PMS degradation of ATZ reaction kinetics was more in line with the quasi first-order reaction kinetics, the inhibition effect of the same concentration of ETA and Clon UV/PMS degradation of ATZ are the same, and UV/PMS degradation of ATZ decreased by 38.54% and 36.29% respectively. The addition of NO3- increased the rate of degradation of ATZ by UV/PMS by 31.21%. By LC-MS analysis, 5 kinds of production m/z and 6 kinds of products were obtained.