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

Yixin Lu, Wenlai Xu, Haisong Nie, Ying Zhang, Na Deng and Jianqiang Zhang
Additional contact information
Yixin Lu: College of Architectural and Environmental Engineering, Chengdu Technological University, Chengdu 611730, China
Wenlai Xu: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 611730, China
Haisong Nie: Department of International Environmental and Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo 1838509, Japan
Ying Zhang: College of Architectural and Environmental Engineering, Chengdu Technological University, Chengdu 611730, China
Na Deng: College of Architectural and Environmental Engineering, Chengdu Technological University, Chengdu 611730, China
Jianqiang Zhang: Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China

IJERPH, 2019, vol. 16, issue 10, 1-13

Abstract: 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 SO 4 − • 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 − , HCO 3 − , and NO 3 − showed inhibitory effects on the degradation of ATZ by US/PMS, with Cl − contributing the strongest inhibitory effect while NO 3 − 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.

Keywords: ultrasound; peroxymonosulfate; free radicals; ATZ; degradation mechanism (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1660-4601/16/10/1781/pdf (application/pdf)
https://www.mdpi.com/1660-4601/16/10/1781/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:16:y:2019:i:10:p:1781-:d:232729

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().