Kinetics and mechanism of thiamethoxam abatement by ozonation and ozone-based advanced oxidation processes.,Journal of Hazardous Materials

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Kinetics and mechanism of thiamethoxam abatement by ozonation and ozone-based advanced oxidation processes.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.jhazmat.2020.122180
Huijiao Wang ₁ , Juhong Zhan ₁ , Lingwei Gao ₁ , Gang Yu ₁ , Sridhar Komarneni ₂ , Yujue Wang ₁

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In this study, the abatement of neonicotinoid insecticide, thiamethoxam, by single ozonation, ozone/ultraviolet (O3/UV) and electro-peroxone (EP) process was evaluated. The second-order rate constants for the reaction of thiamethoxam with O3 and hydroxyl radical (OH) at pH 7 were determined to be 15.4 M-1 s-1 and 3.9 × 109 M-1 s-1, respectively. The degradation pathways of thiamethoxam were proposed based on quantum chemical calculations and transformation products were identified using chromatographic and mass-spectrometric techniques. The acute and chronic toxicity of thiamethoxam and its major TPs to various aquatic organisms were assessed. With typical ozone doses applied in water treatment (≤5 mg/L), thiamethoxam was abated by only ∼16-32 % in two real water matrices (groundwater and surface water) during single ozonation, but by ∼100 % and >70 % during the O3/UV and EP treatment, respectively. The energy demand to abate 90 % thiamethoxam in the two water matrices was generally comparable for single ozonation and the EP process (∼0.14 ± 0.03 kW h/m3), but higher for the O3/UV process (0.21-0.22 kW h/m3). These results suggest that single ozonation is unable to sufficiently abate thiamethoxam under typical conditions of water treatment. Therefore, ozone-based advanced oxidation processes are needed to enhance thiamethoxam abatement.

中文翻译：

臭氧化和基于臭氧的高级氧化工艺消除噻虫嗪的动力学和机理。

在这项研究中，评估了通过单次臭氧化，臭氧/紫外线（O3 / UV）和电子过氧化物（EP）工艺消除新烟碱类杀虫剂噻虫嗪的效果。噻虫嗪与O3和pH值为7的羟基自由基（OH）反应的二级速率常数分别确定为15.4 M-1 s-1和3.9×109 M-1 s-1。根据量子化学计算提出了噻虫嗪的降解途径，并通过色谱和质谱技术鉴定了转化产物。评估了噻虫嗪及其主要TP对各种水生生物的急性和慢性毒性。在水处理中使用典型的臭氧剂量（≤5mg / L）时，在一次臭氧化过程中，在两种真实的水基质（地下水和地表水）中，噻虫嗪仅减少了约16-32％，但在O3 / UV和EP处理期间分别降低了约100％和> 70％。通常，在两种水基质中减少90％的噻虫嗪的能量需求在单次臭氧化和EP工艺中可比（约0.14±0.03 kW h / m3），而在O3 / UV工艺中则更高（0.21-0.22 kW h / m3）。）。这些结果表明，单次臭氧氧化不能在典型的水处理条件下充分消除噻虫嗪。因此，需要基于臭氧的高级氧化工艺来增强噻虫嗪的减排效果。这些结果表明，单次臭氧氧化不能在典型的水处理条件下充分消除噻虫嗪。因此，需要基于臭氧的高级氧化工艺来增强噻虫嗪的减排效果。这些结果表明，单次臭氧氧化不能在典型的水处理条件下充分消除噻虫嗪。因此，需要基于臭氧的高级氧化工艺来增强噻虫嗪的减排效果。

更新日期：2020-01-23

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