Degradation of anticorrosive agent benzotriazole by electron beam irradiation: Mechanisms, degradation pathway and toxicological analysis.
Degradation of anticorrosive agent benzotriazole by electron beam irradiation: Mechanisms, degradation pathway and toxicological analysis.
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DOI：
10.1016/j.chemosphere.2021.132133
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发表时间：
2022-01
期刊：
影响因子：
8.8
通讯作者：
Wentao Yin;Hai-yang Shao;Zhuhao Huo;Siqi Wang;Qi Zou;Gang Xu
中科院分区：
文献类型：
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作者：
Wentao Yin;Hai-yang Shao;Zhuhao Huo;Siqi Wang;Qi Zou;Gang Xu
苯并三氮唑(BTA)是一种新兴的持久性污染物，被广泛用作家居和工程制剂。尽管移除BTA的精神是愿意的，但传统的废水处理方法是软弱的。因此，本研究对电子束降解BTA进行了系统的研究。结果表明，经5.0kGy射线照射后，即使是87.5mgBTA也能完全去除L−-1BTA，符合准一级动力学模型。考察了溶液pH、无机阴离子(CO3 2−、HCO3−、NO2−、NO2−、SO4 2−、SO3 2−、Cl−)和气体气氛对反应的影响。结果表明，氧化羟基自由基在BTA辐照过程中起着关键作用。此外，H_2O_2和K_2 S_2O_8的存在不仅显著地促进了苯并三氮唑的降解程度，而且由于它们都增加了氧化自由基的生成，从而提高了其矿化效率。此外，通过理论计算和实验结果相结合，可以推断BTA的降解主要是通过苯环开环进行的。进一步的毒性评价证明，随着照射的进行，毒性逐渐减轻。综上所述，有各种迹象表明，电子束辐照可以有效地消除水环境中的BTA。
Benzotriazole (BTA), which is extensively served as household and engineering agent, is one of the emerging and persistent contaminants. Despite the spirit to remove BTA is willing, the traditional wastewater treatments are weak. Therefore, the degradation of BTA via electron beam was systematically explored in this study. It turned out that after 5.0 kGy irradiation, even 87.5 mg L− 1 BTA could be completely removed, and the irradiation conformed perfectly to the pseudo first-order kinetics model. The effects of solution pH, inorganic anions (CO 3 2−, HCO 3−, NO 3−, NO 2−, SO 4 2−, SO 3 2−, Cl−), and gas atmosphere were all explored. And results indicated that oxidative hydroxyl radicals played critical role in BTA irradiation. Additionally, presence of H 2 O 2 and K 2 S 2 O 8 promoted significantly not only degradation extent but also mineralization efficiency of BTA due to they both augmented the generation of oxidative free radicals. Moreover, by combining theoretical calculations with experimental results, it could be inferred that degradation of BTA was mainly carried out by the benzene ring-opening. Further toxicity evaluation proved that as irradiation proceeded, the toxicity alleviated. Taken together, there were various indications that BTA could be effectively eliminated by electron beam irradiation in aquatic environments.