Degradation of Atrazine by UV/PMS
in Phosphate Buffer

Lü, Yixin; Ding, Zhangkai; Zhang, Jianqiang; Fu, Chen‐Chen; Xia, Xinyue; Fang, Yuxiao

doi:10.15244/pjoes/94213

Cited by 7 publications

(2 citation statements)

References 16 publications

(19 reference statements)

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“…The ATZ removal rate increased from 19.37% to 50.96% when the reaction temperature rose from 10 °C to 25 °C. This is mainly due to the increase in the percentage of PMS molecules activated by a temperature rise, which accelerates the decomposition of PMS to generate SO 4 − • and HO• [24]. At the same time, increasing the temperature will accelerate the motion speed of molecules and increasing the collision frequency between ATZ, SO 4 − •, and HO•, accelerates the degradation of ATZ.…”

Section: Resultsmentioning

confidence: 99%

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

Lü

Nie

et al. 2019

IJERPH

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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.

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Section: Resultsmentioning

confidence: 99%

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

Lü

Nie

et al. 2019

IJERPH

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“…It can be seen from the mass spectra, total ion flow diagram, and extract ionic flow diagram of the three samples that the charge mass ratio of the main ATZ degradation products are 128, 146, 174, 188, 198, 214, and 232 [30,31,50,51], and so on. ATZ has a relative molecular mass of 216.…”

Section: The Azt Degradation Products Via Heat/pms and Degradation Pa...mentioning

confidence: 99%

Heat/PMS Degradation of Atrazine: Theory and Kinetic Studies

et al. 2022

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The degradation effect of heat/peroxymonosulfate (PMS) on atrazine (ATZ) is studied. The results show that the heat/PMS degradation for ATZ is 96.28% at the moment that the phosphate buffer (PB) pH, temperature, PMS dosage, ATZ concentration, and reaction time are 7, 50 °C, 400 μmol/L, 2.5 μmol/L, and 60 min. A more alkaline PB is more likely to promote the breakdown of ATZ through heat/PMS, while the PB alone has a more acidic effect on the PMS than the partially alkaline solution. HO• and SO4−• coexisted within the heat/PMS scheme, and ATZ quantity degraded by HO• and SO4−• in PB with pH = 7, pH = 1.7~1. HCO3− makes it difficult for heat/PMS to degrade ATZ according to inorganic anion studies, while Cl− and NO3− accelerate the degradation and the acceleration effect of NO3− is more obvious. The kinetics of ATZ degradation via heat/PMS is quasi-first-order. Ethanol (ETA) with the identical concentration inhibited ATZ degradation slightly more than HCO3−, and both of them reduced the degradation rates of heat/PMS to 7.06% and 11.56%. The addition of Cl− and NO3− increased the maximum rate of ATZ degradation by heat/PMS by 62.94% and 189.31%.

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