日光/氯氧化体系降解阿特拉津的效能及机理研究

doi:10.19965/j.cnki.iwt.2022-0944

摘要/Abstract

摘要：

以日光/氯作为研究体系，考察了其对典型除草剂阿特拉津（ATZ）的降解效能。研究了初始氧化剂NaClO浓度、pH、阴离子浓度（CO₃^2-/HCO₃^-和Cl^-）、天然有机物（NOM）对ATZ降解的影响。结果表明，在酸性条件下ATZ的降解受到促进作用，这是由于体系中产生的活性成分（O₃、HO·、RCS）会加快体系反应的进行；而在碱性条件下ATZ的降解受到明显抑制作用，阴离子和天然有机物的存在均会抑制ATZ的去除，这主要是由于其与ATZ竞争自由基反应造成的。测定了8种氧化产物，推测ATZ的降解路径主要是通过电子转移反应、夺氢反应和加成反应这3种途径降解。急性毒性实验表明ATZ在降解过程中毒性减小。

关键词: 日光/氯, 阿特拉津, 降解效能, 氧化产物, 毒性实验

Abstract:

The degradation efficiency of typical herbicide Atrazine（ATZ） was investigated using solar/chlorine as the research system. The effects of initial oxidizing agent NaClO concentration，pH，anion concentration（CO₃^2-/HCO₃^- and Cl^-） and natural organic matter NOM on ATZ degradation were investigated. The results showed that the degradation of ATZ was promoted under acidic conditions，because the active components（O₃，HO·，RCS） produced in the system would accelerate the reaction，while the degradation of ATZ was significantly inhibited under alkaline conditions. The removal of ATZ was inhibited by the presence of anions and natural organic matter，which was mainly due to its competition with ATZ for free radical reactions. Eight kinds of oxidation products were determined，and the degradation paths of ATZ were speculated，mainly through electron transfer reaction，hydrogen capture reaction and addition reaction. The acute toxicity experiment showed that the toxicity of ATZ decreased during degradation.

Key words: solar/chlorine, atrazine, degradation efficiency, oxidation product, toxicity experiment

中图分类号:

X703.1

于凡, 谭凤训, 罗从伟, 武道吉, 陈永凯, 李明安. 日光/氯氧化体系降解阿特拉津的效能及机理研究[J]. 工业水处理, 2023, 43(5): 77-84.

Fan YU, Fengxun TAN, Congwei LUO, Daoji WU, Yongkai CHEN, Ming’an LI. Degradation of atrazine by simulated solar and chlorine oxidation processes：Efficiency and mechanism[J]. Industrial Water Treatment, 2023, 43(5): 77-84.

https://www.iwt.cn/CN/Y2023/V43/I5/77

图/表 10

图1 日光辐射装置

Fig. 1 Solar radiation equipment

图2 ATZ在3种条件下的降解效果

Fig. 2 Degradation effect of ATZ under three conditions

图3 不同NaClO浓度对ATZ降解效率的影响

Fig. 3 Influence of NaClO dosage on ATZ degradation efficiency

图4 不同pH对ATZ降解效率的影响

Fig. 4 Effect of pH on ATZ degradation efficiency

图5 不同HCO₃^-浓度对ATZ降解效果的影响

Fig. 5 Effect of HCO₃^- concentration on ATZ degradation

图6 不同Cl^-浓度对ATZ降解效果的影响

Fig. 6 Effect of Cl^- concentration on ATZ degradation

图7 NOM质量浓度对ATZ降解效果的影响

Fig. 7 Influence of NOM concentration on ATZ degradation

表1 日光/氯体系ATZ降解的中间产物信息

Table 1 Information on intermediates of ATZ degradation in solar/chlorine system

氧化产物	m/z	分子式	保留时间/min
TP216	216	C₈H₁₄N₅Cl	9.110
TP232	232	C₈H₁₄N₅OCl	8.301
TP214	214	C₈H₁₂N₅Cl	5.552
TP198	198	C₈H₁₅N₅O	6.664
TP188	188	C₆H₁₀N₅Cl	2.610
TP174	174	C₅H₈N₅Cl	7.315
TP172	172	C₅N₅H₆Cl	5.550
TP156	156	C₅H₉N₅O	1.182
TP146	146	C₃H₄N₅Cl	5.573

图8 日光/氯体系中ATZ的降解途径

Fig. 8 Degradation pathways of ATZ in solar/chlorine system

图9 日光/氯体系降解ATZ过程中对明亮发光杆菌急性毒性的变化

Fig. 9 Changes of acute toxicity to Luminescent Bacillusduring degradation of ATZ by solar/chlorine system

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