School of Environmental Science & Technology, Dalian University of Technology, Dalian, 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, Dalian University of Technology, Dalian, 116024, China.
Environ Sci Pollut Res Int. 2018 Dec;25(35):35479-35491. doi: 10.1007/s11356-018-3276-4. Epub 2018 Oct 22.
Trans-ferulic acid (FA), extensively used in pharmaceutical and olive oil industries, causes huge risks to ecological environment due to its biotoxicity and phytotoxicity, leading to the difficulty of biochemical processes in treating FA wastewater. In this study, synergistic degradation of FA via dielectric barrier discharge (DBD) plasma and O (plasma-ozone) was studied. The results showed that FA degradation efficiency reached 96.9% after a 40-min treatment by plasma-ozone process, and the energy efficiency of FA degradation was increased by 62.5 and 24.5% compared to single DBD plasma and ozonation treatment. Moreover, FA degradation rate constant in plasma-ozone process was 41% higher compared with the sum of single DBD plasma and ozonation, indicating a significant synergistic effect. Radical diagnosis experiments reveal that a profound increase of ·OH yield through peroxone (HO/O) and UV/O pathways is the important mechanism of synergistic degradation of FA in plasma-ozone process, while e played little role in FA degradation. A degradation pathway of FA by plasma-ozone was also proposed according to the detected intermediates from EEM and LC-MS. This work revealed that plasma-ozone process is an alternative process for FA treatment, and the findings are helpful for understanding FA degradation characteristics and synergistic mechanisms in plasma-ozone process.
阿魏酸（FA）在制药和橄榄油工业中广泛应用，但由于其生物毒性和植物毒性，对生态环境造成了巨大风险，导致 FA 废水的生化处理过程困难。本研究采用介质阻挡放电（DBD）等离子体与 O（等离子体-臭氧）协同降解 FA。结果表明，等离子体-臭氧处理 40min 后，FA 的降解效率达到 96.9%，与单独的 DBD 等离子体和臭氧处理相比，FA 降解的能量效率分别提高了 62.5%和 24.5%。此外，等离子体-臭氧处理中 FA 的降解速率常数比单独的 DBD 等离子体和臭氧处理的总和高 41%，表明存在显著的协同效应。自由基诊断实验表明，过氧（HO/O）和 UV/O 途径中·OH 产量的大幅增加是等离子体-臭氧协同降解 FA 的重要机制，而 e 在 FA 降解中作用不大。根据 EEM 和 LC-MS 检测到的中间产物，提出了 FA 等离子体-臭氧降解途径。这项工作表明，等离子体-臭氧工艺是 FA 处理的一种替代工艺，研究结果有助于理解 FA 在等离子体-臭氧工艺中的降解特性和协同机制。
