Vishwakarma Institute of Technology, Pune 411037, India.
J Hazard Mater. 2013 Oct 15;261:139-47. doi: 10.1016/j.jhazmat.2013.07.012. Epub 2013 Jul 17.
In the present work, degradation of imidacloprid (neonicotinoid class of insecticide) in aqueous solution has been systematically investigated using hydrodynamic cavitation and combination of hydrodynamic cavitation (HC) and H2O2. Initially, effect of different operating parameters such as inlet pressure to the cavitating device (5-20 bar) and operating pH (2-7.5) has been investigated. Optimization of process parameters was followed by the study of effect of combination of HC and H2O2 process on the rate of degradation of imidacloprid. Significant enhancement in the rate of degradation of imidacloprid has been observed using HC+H2O2 process which lead to a complete degradation of imidacloprid in 45 min of operation using optimal molar ratio of imidacloprid:H2O2 as 1:40. Substantial synergetic effect has been observed using HC+H2O2 process which confer the synergetic coefficient of 22.79. An attempt has been made to investigate and compare the energy efficiency and extent of mineralization of individual and combined processes applied in the present work. Identification of the byproducts formed during degradation of imidacloprid has also been done using LC-MS analysis. The present work has established a fact that hydrodynamic cavitation in combination with H2O2 can be effectively used for degradation of imidacloprid.
在本工作中，系统地研究了水动力空化和水动力空化与 H2O2 的组合在水溶液中对吡虫啉（新烟碱类杀虫剂）的降解。首先，考察了不同操作参数（空化装置入口压力（5-20 bar）和操作 pH（2-7.5））的影响。在优化工艺参数之后，研究了 HC 和 H2O2 工艺组合对吡虫啉降解速率的影响。使用 HC+H2O2 工艺可显著提高吡虫啉的降解速率，在最优摩尔比吡虫啉：H2O2 为 1:40 的条件下，操作 45 分钟即可完全降解吡虫啉。使用 HC+H2O2 工艺观察到了显著的协同效应，协同系数为 22.79。尝试了调查和比较本工作中应用的单独和组合工艺的能量效率和矿化程度。还使用 LC-MS 分析鉴定了在吡虫啉降解过程中形成的副产物。本工作证实了水动力空化与 H2O2 联合可有效地用于降解吡虫啉。
