State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Brook Byer Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
J Hazard Mater. 2019 Apr 15;368:178-185. doi: 10.1016/j.jhazmat.2019.01.043. Epub 2019 Jan 15.
Vaccum-ultraviolet (VUV) is effective for elimination of organic contaminants in aqueous environment and degradation of carbamazepine (CBZ) by VUV irradiation was systematically investigated in this study. A dynamic kinetic model was developed to simulate the destruction of CBZ that is mainly initiated by hydroxyl radicals (HO). The second-order rate constant of the reaction between CBZ and HO was determined to be 1.4 × 10 M s. Effect of initial CBZ concentration, VUV irradiation intensity and natural organic matter (NOM) were further investigated in several batch experiments. The predicted CBZ removal rates increased with the increasing VUV intensity, while decreased with the increasing initial CBZ and NOM concentrations. Based on the electrical energy per order (EE/O) calculation, the optimal VUV intensity was determined to be 7.5 × 10 Einstein s. Meanwhile, several intermediates/products were identified and their time-dependent evolution profiles were determined, and finally a plausible degradation pathway of CBZ was proposed. Ecotoxicity assessment indicated that the potential toxicity of CBZ and its oxidation products should be paid more attention in the VUV process.
真空紫外光（VUV）可有效去除水环境污染中的有机污染物，本研究系统研究了 VUV 辐照对卡马西平（CBZ）的降解作用。本文建立了一个动力学模型来模拟 CBZ 的破坏过程，主要由羟基自由基（HO）引发。确定了 CBZ 与 HO 之间的反应的二级速率常数为 1.4×10M s。在几组分批实验中进一步研究了初始 CBZ 浓度、VUV 辐照强度和天然有机物（NOM）的影响。预测的 CBZ 去除率随 VUV 强度的增加而增加，而随初始 CBZ 和 NOM 浓度的增加而降低。基于电能每阶（EE/O）计算，确定最佳 VUV 强度为 7.5×10 Einstein s。同时，鉴定了几种中间产物/产物，并确定了它们的时变演化曲线，最终提出了 CBZ 的可能降解途径。生态毒性评估表明，在 VUV 过程中应更加关注 CBZ 及其氧化产物的潜在毒性。
