Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
J Hazard Mater. 2019 Mar 15;366:669-676. doi: 10.1016/j.jhazmat.2018.12.056. Epub 2018 Dec 17.
A coupling technique introducing sodium percarbonate (SPC) into a dielectric barrier discharge (DBD) plasma was investigated to enhance the degradation of antibiotic tetracycline (TC) in aqueous. The dominant effects of SPC addition amount and discharge voltage were evaluated firstly. The experiments indicated that the moderate SPC dosages in the DBD presented an obvious synergistic effect, improving the TC decomposition efficiency and kinetics. Elevating the voltage was conducive for the promotion of antibiotic abatement. After 5 min treatment, the removal reached 94.3% at the SPC of 52.0 μmol/L and voltage of 4.8 kV for 20 mg/L TC. Especially the defined synergy factors were greater than one since the SPC being added, and the energy yield was increased by 155%. Besides, the function mechanism was explained by the hydrogen peroxide and ozone quantitative determinations and radical scavenger test, and the results confirmed that the collaborative method could increase the generation of reactive species, and the produced hydroxyl and superoxide radicals both played the significant roles for the TC elimination. Furthermore, the decomposition and mineralization of the synergism were verified by UV-vis spectroscopy, TOC and COD analyses, and the degradation byproducts and transformation pathways were identified based on the analysis of HPLC-MS finally.
一种将过碳酸钠（SPC）引入介电阻挡放电（DBD）等离子体中的偶联技术被用于增强水中抗生素四环素（TC）的降解。首先评估了 SPC 添加量和放电电压的主要影响。实验表明，DBD 中适量的 SPC 具有明显的协同作用，提高了 TC 的分解效率和动力学。提高电压有利于促进抗生素的消除。在 5 min 的处理后，对于 20 mg/L 的 TC，当 SPC 为 52.0 μmol/L 和电压为 4.8 kV 时，去除率达到 94.3%。特别是加入 SPC 后，定义的协同因子大于 1，能量产率提高了 155%。此外，通过定量测定过氧化氢和臭氧以及自由基清除剂试验解释了作用机制，结果证实协同作用可以增加活性物质的生成，产生的羟基和超氧自由基都对 TC 的消除起着重要作用。此外，通过紫外-可见光谱、TOC 和 COD 分析验证了协同作用的分解和矿化作用，最后基于 HPLC-MS 分析确定了降解副产物和转化途径。
