Han Xiangyun, Zhang Xi, Zhang Lei, Pan Mei, Yan Jinlong
School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224003, China.
College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 201418, China.
R Soc Open Sci. 2018 Jun 27;5(6):180322. doi: 10.1098/rsos.180322. eCollection 2018 Jun.
The photodegradation of benzothiazole (BTH) in wastewater with the coexistence of iron oxides and oxalic acid under UV light irradiation was investigated. Results revealed that an effective heterogeneous photo-Fenton-like system could be set up for BTH abatement in wastewater under UV irradiation without additional HO, and 88.1% BTH was removed with the addition of 2.0 mmol l oxalic acid and 0.2 g l α-FeO using a 500 W high-pressure mercury lamp (365 nm). The degradation of BTH in the photo-Fenton-like system followed the first-order kinetic model. The photoproduction of hydroxyl radicals (·OH) in different systems was determined by high-performance liquid chromatography. Identification of transformation products by using liquid chromatography coupled with high resolution tandem mass spectrometry provided information about six transformation products formed during the photodegradation of BTH. Further insight was obtained by monitoring concentrations of the sulfate ion and nitrate ion , which demonstrated that the intermediate products of BTH could be decomposed ultimately. Based on the results, the potential photodegradation pathway of BTH was also proposed.
研究了在紫外光照射下，废水中苯并噻唑（BTH）在氧化铁和草酸共存时的光降解情况。结果表明，在紫外照射下，无需额外添加羟基自由基（·OH），即可建立一个有效的非均相类光芬顿体系来去除废水中的BTH。使用500 W高压汞灯（365 nm），添加2.0 mmol·L草酸和0.2 g·Lα-Fe₂O₃时，88.1%的BTH被去除。类光芬顿体系中BTH的降解遵循一级动力学模型。通过高效液相色谱法测定了不同体系中羟基自由基（·OH）的光生成量。利用液相色谱-高分辨率串联质谱法鉴定转化产物，提供了BTH光降解过程中形成的六种转化产物的信息。通过监测硫酸根离子和硝酸根离子的浓度获得了进一步的认识，这表明BTH的中间产物最终可以分解。基于这些结果，还提出了BTH潜在的光降解途径。
