College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, Jiangsu, People's Republic of China.
College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, Jiangsu, People's Republic of China.
Ultrason Sonochem. 2020 Jan;60:104749. doi: 10.1016/j.ultsonch.2019.104749. Epub 2019 Aug 24.
The effectiveness and synergistic mechanisms of combining ultrasonic process (US) with peroxymonosulfate (PMS) were investigated using Bisphenol A (BPA) and Dimethyl Phthalate (DMP) as the model pollutants. Synergy between US and PMS improved the degradation of target pollutants, and PMS was found to play a dual role. The optimum dosage of PMS and the extent of efficiency promotion were found to depend on not only the ultrasonic frequency but also on the hydrophobicity of target pollutants. The scavenger quenching experiments and electron paramagnetic resonance analysis indicated that OH was responsible for DMP degradation in both US and US/PMS processes. The chemical probe experiments also proved that activation of PMS could increase the production of OH while excess PMS consumed the available radicals. Furthermore, it was found for the first time that the constituent salts of KHSO and KSO in the commercial Oxone also made considerable influence on US/PMS process. It was also found that the combination of US and PMS showed more pronounced synergistic effect for treating DMP at lower concentrations. Higher efficiency was achieved at more acidic condition and similar efficiencies were obtained at pH range of 5.1 ~ 8.12. DMP degradation pathways were found to be the OH addition to the aromatic ring and hydrogen absorption at the aliphatic chains with and without the presence of PMS, but much better mineralization capability was obtained in the presence of PMS than ultrasonic degradation alone.
采用双酚 A（BPA）和邻苯二甲酸二甲酯（DMP）作为模型污染物，研究了超声过程（US）与过一硫酸盐（PMS）联合的有效性和协同机制。US 与 PMS 的协同作用提高了目标污染物的降解效率，且发现 PMS 发挥了双重作用。发现 PMS 的最佳用量和效率提升程度不仅取决于超声频率，还取决于目标污染物的疏水性。猝灭实验和电子顺磁共振分析表明，在 US 和 US/PMS 过程中，OH 均负责 DMP 的降解。化学探针实验还证明，PMS 的活化可以增加 OH 的产生，而过量的 PMS 则消耗了可用的自由基。此外，这是首次发现 Oxone 中 KHSO 和 KSO 的组成盐对 US/PMS 过程也有相当大的影响。还发现，US 和 PMS 的组合对低浓度 DMP 的处理表现出更明显的协同效应。在酸性条件下，效率更高，在 pH 值为 5.1~8.12 范围内，效率相似。发现 DMP 的降解途径是 OH 加成到芳环上，以及在有无 PMS 的情况下，脂肪链上的氢吸收，但在 PMS 存在下比单独超声降解具有更好的矿化能力。
