School of Environmental Science and Engineering, Shandong University, 72 Binhailu, Qingdao, 266237, China.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Qingdao, 266237, China.
Environ Sci Pollut Res Int. 2020 Aug;27(23):29599-29611. doi: 10.1007/s11356-020-09303-0. Epub 2020 May 22.
Clothianidin served as the model pollutant to investigate the performance and mechanism of pollutant removal by dielectric barrier discharge plasma (DBD) combined with the titanium dioxide-reduced graphene oxide (rGO-TiO) composite catalyst. In this study, different ratios of titanium dioxide-graphene catalysts were loaded onto honeycomb ceramic plates via the sol-gel method, and the modified catalytic ceramic plates were characterized by XRD, SEM, FTIR, DRS, and energy dispersive X-ray. The results suggested that the rGO-TiO was well loaded on the surface of the honeycomb ceramic plates. According to the results of the characterization experiments and the degradation of the clothianidin solution with different proportions of the catalyst, 8 wt% rGO-TiO was selected as the optimum ratio for degradation. Clothianidin degradation efficiency was significantly influenced by input power, clothianidin concentration, pH value, liquid conductivity, free radical quencher. Finally, six degradation products of clothianidin were identified by HPLC-MS, and the possible transformation pathways of clothianidin degradation were identified. Graphical abstract.
以噻虫啉为模式污染物，考察介质阻挡放电等离子体（DBD）与负载型 TiO2-还原氧化石墨烯（rGO-TiO）复合催化剂协同去除污染物的性能及机制。采用溶胶-凝胶法将不同比例的 TiO2-石墨烯催化剂负载到蜂窝陶瓷板上，通过 XRD、SEM、FTIR、DRS 和能谱对改性催化陶瓷板进行了表征。结果表明，rGO-TiO 负载在蜂窝陶瓷板表面。根据表征实验结果和不同催化剂比例下的噻虫啉溶液降解结果，选择 8wt%rGO-TiO 作为最佳降解比例。输入功率、噻虫啉浓度、pH 值、液体电导率、自由基猝灭剂对噻虫啉的降解效率有显著影响。最后，通过高效液相色谱-质谱联用仪（HPLC-MS）鉴定了 6 种噻虫啉的降解产物，确定了噻虫啉降解的可能转化途径。图摘要。
