Yuan Dan, Wan Shungang, Liu Rurong, Wang Mengmeng, Sun Lei
School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China.
Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, Haikou 570228, China.
Materials (Basel). 2022 May 23;15(10):3731. doi: 10.3390/ma15103731.
A novel material of self-shaped ZnO-embedded biomass carbon foam pellets (ZnO@BCFPs) was successfully synthesized and used as fluidized particle electrodes in three-dimensional (3D) electro-peroxone systems for metronidazole degradation. Compared with 3D and 2D + O systems, the energy consumption was greatly reduced and the removal efficiencies of metronidazole were improved in the 3D + O system. The degradation rate constants increased from 0.0369 min and 0.0337 min to 0.0553 min, respectively. The removal efficiencies of metronidazole and total organic carbon reached 100% and 50.5% within 60 min under optimal conditions. It indicated that adding ZnO@BCFPs particle electrodes was beneficial to simultaneous adsorption and degradation of metronidazole due to improving mass transfer of metronidazole and forming numerous tiny electrolytic cells. In addition, the process of metronidazole degradation in 3D electro-peroxone systems involved hydroxyethyl cleavage, hydroxylation, nitro-reduction, N-denitrification and ring-opening. The active species of ·OH and ·O played an important role. Furthermore, the acute toxicity LD and the bioconcentration factor of intermediate products decreased with the increasing reaction time.
一种新型的自成型氧化锌嵌入生物质碳泡沫颗粒（ZnO@BCFPs）材料被成功合成，并用作三维（3D）电-过氧酮系统中用于甲硝唑降解的流化颗粒电极。与3D和2D + O系统相比，3D + O系统的能耗大幅降低，甲硝唑的去除效率得到提高。降解速率常数分别从0.0369 min和0.0337 min增加到0.0553 min。在最佳条件下，甲硝唑和总有机碳的去除效率在60分钟内分别达到100%和50.5%。这表明添加ZnO@BCFPs颗粒电极有利于甲硝唑的同时吸附和降解，这是由于改善了甲硝唑的传质并形成了众多微小的电解池。此外，3D电-过氧酮系统中甲硝唑的降解过程涉及羟乙基裂解、羟基化、硝基还原、N-脱氮和开环。·OH和·O等活性物种起到了重要作用。此外，中间产物的急性毒性LD和生物富集系数随反应时间的增加而降低。
