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Open AccessArticle

Mechanism and Kinetic Analysis of Degradation of Atrazine by US/PMS

by Yixin Lu 1,2,3, Wenlai Xu 4,5,*, Haisong Nie 6,*, Ying Zhang 1, Na Deng 1 and Jianqiang Zhang 3
1
College of Architectural and Environmental Engineering, Chengdu Technological University, Chengdu 611730, China
2
Center of Big Data for Smart Environmental Protection, Chengdu Technological University, Chengdu 611730, China
3
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China
4
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 611730, China
5
Haitian Water Grp Co Ltd., Chengdu 610059, China
6
Department of International Environmental and Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo 1838509, Japan
*
Authors to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(10), 1781; https://doi.org/10.3390/ijerph16101781
Received: 23 March 2019 / Revised: 2 May 2019 / Accepted: 16 May 2019 / Published: 20 May 2019
The degradation effect, degradation mechanism, oxidation kinetics, and degradation products of Atrazine (ATZ) by Ultrasound/Peroxymonosulfate (US/PMS) in phosphate buffer (PB) under different conditions were studied. It turned out that the degradation rate of US/PMS to ATZ was 45.85% when the temperature of the reaction system, concentration of PMS, concentration of ATZ, ultrasonic intensity, and reaction time were 20 °C, 200 μmol/L, 1.25 μmol/L, 0.88 W/mL, and 60 min, respectively. Mechanism analysis showed that PB alone had no degradation effect on ATZ while PMS alone had extremely weak degradation effect on ATZ. HO• and SO4• coexist in the US/PMS system, and the degradation of ATZ at pH7 is dominated by free radical degradation. Inorganic anion experiments revealed that Cl, HCO3, and NO3 showed inhibitory effects on the degradation of ATZ by US/PMS, with Cl contributing the strongest inhibitory effect while NO3 showed the weakest suppression effect. According to the kinetic analysis, the degradation kinetics of ATZ by US/PMS was in line with the quasi-first-order reaction kinetics. ETA with concentration of 1 mmol/L reduced the degradation rate of ATZ by US/PMS to 10.91%. Product analysis indicated that the degradation of ATZ by US/PMS was mainly achieved by dealkylation, dichlorination, and hydroxylation, but the triazine ring was not degraded. A total of 10 kinds of ATZ degradation intermediates were found in this experiment. View Full-Text
Keywords: ultrasound; peroxymonosulfate; free radicals; ATZ; degradation mechanism ultrasound; peroxymonosulfate; free radicals; ATZ; degradation mechanism
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Lu, Y.; Xu, W.; Nie, H.; Zhang, Y.; Deng, N.; Zhang, J. Mechanism and Kinetic Analysis of Degradation of Atrazine by US/PMS. Int. J. Environ. Res. Public Health 2019, 16, 1781.

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