Ascorbic acid induced atrazine degradation
Ascorbic acid induced atrazine degradation
复制标题
抗坏血酸诱导莠去津降解
DOI：
10.1016/j.jhazmat.2016.12.048
复制
发表时间：
2017
影响因子：
13.6
通讯作者：
Zhang Lizhi
中科院分区：
文献类型：
--
作者：
Hou Xiaojing;Huang Xiaopeng;Ai Zhihui;Zhao Jincai;Zhang Lizhi
本文系统研究了不同pH值下抗坏血酸对莠去津的降解效果及降解机理。抗坏血酸在pH 4 ~ 12的较宽范围内均能降解莠去津，但在酸性（pH ≤ 4）和碱性（pH ≥ 12）条件下，莠去津的降解率均高于中性（pH = 7）条件。阿特拉津降解的pH依赖性与阿特拉津的反应特性和抗坏血酸的还原活性有关。采用液相色谱-质谱联用、高效液相色谱和离子色谱等技术，对不同pH条件下抗坏血酸诱导莠去津降解的中间产物进行比较，研究了不同pH条件下抗坏血酸诱导莠去津降解的途径。结果发现，在碱性条件下，抗坏血酸的存在下，检测到更多的产物。氯离子的出现证实了抗坏血酸在无分子氧存在下对莠去津的脱氯作用，而在pH 12时其脱氯效率最高。这些结果为AA在有机污染物修复中的应用提供了参考。
In this study, we systematically investigated the degradation efficiency and the degradation mechanism of atrazine in the presence of ascorbic acid at different pH values. Although atrazine could be degraded by ascorbic acid in a wide pH range from 4 to 12, its degradation under either acidic (pH ≤ 4) or alkaline (pH ≥ 12) condition was more efficient than under neutral condition (pH = 7). This pH dependent atrazine degradation was related to the reactive characteristic of atrazine and the reductive activity of ascorbic acid. The ascorbic acid induced atrazine degradation pathways at different pH were investigated by comparing the atrazine degradation intermediates with liquid chromatography-mass spectrometry, high performance liquid chromatography and ion chromatography. It was found that more products were detected in presence of ascorbic acid at alkaline condition. The appearance of chloride ions confirmed the dechlorination of atrazine by ascorbic acid in the absence of molecular oxygen, while its dechlorination efficiency reached highest at pH 12. These results can shed light on the application of AA for the organic pollutant remediation.