School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China.
School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai, 200444, PR China; Key Laboratory of Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai, 200444, PR China.
Chemosphere. 2022 Jan;287(Pt 2):132133. doi: 10.1016/j.chemosphere.2021.132133. Epub 2021 Sep 4.
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 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, HCO, NO, NO, SO, SO, Cl), and gas atmosphere were all explored. And results indicated that oxidative hydroxyl radicals played critical role in BTA irradiation. Additionally, presence of HO and KSO 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.
苯并三唑（BTA）作为一种广泛应用于家庭和工程领域的试剂，是一种新兴的持久性污染物。尽管人们有意去除 BTA，但传统的废水处理方法效果不佳。因此，本研究系统地探讨了利用电子束降解 BTA。结果表明，经过 5.0 kGy 的辐照后，即使是 87.5 mg/L 的 BTA 也能被完全去除，辐照过程符合准一级动力学模型。本研究还考察了溶液 pH 值、无机阴离子（CO、HCO、NO、NO、SO、SO、Cl）和气体氛围的影响。结果表明，氧化羟基自由基在 BTA 的辐照过程中发挥了关键作用。此外，HO 和 KSO 的存在不仅显著提高了 BTA 的降解程度，还提高了其矿化效率，这主要是因为它们都增加了氧化自由基的生成。此外，通过理论计算与实验结果相结合，可以推断出 BTA 的降解主要是通过苯环的开环进行的。进一步的毒性评估证明，随着辐照的进行，毒性逐渐降低。综上所述，电子束辐照在水环境保护中能够有效地去除 BTA。
