Kinetics of photocatalytic removal of imidacloprid from water by advanced oxidation processes with respect to nanotechnology
Kinetics of photocatalytic removal of imidacloprid from water by advanced oxidation processes with respect to nanotechnology
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DOI：
10.2166/wh.2019.259
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发表时间：
2019-04-01
影响因子：
2.3
通讯作者：
Sakugawa, H.
中科院分区：
文献类型：
--
作者：
Derbalah, A.;Sunday, M.;Sakugawa, H.
研究了两种高级氧化体系(正常氧化锌/过氧化氢/人工太阳光和纳米氧化锌/过氧化氢/人工太阳光)光催化去除水体中吡虫啉的动力学。此外，还考察了pH值、杀虫剂浓度、催化剂浓度、催化剂粒径、水型等因素对吡虫啉的光催化去除效果的影响。此外，通过总有机碳(TOC)分析和离子层析，通过监测溶解有机碳(DOC)浓度和无机离子(Cl-和NO2-)形成速率随照射时间的下降，评估了吡虫啉在这些高级氧化体系下的总矿化情况，以证实吡虫啉在水中的完全解毒。在纯净水和河水中，纳米氧化锌/过氧化氢/人工太阳光体系中吡虫啉的降解速率均快于正常氧化锌/人工太阳光体系。在两种高级氧化体系中，吡虫啉的光催化降解均受pH值、催化剂浓度、吡虫啉浓度和水质类型的影响。在纳米氧化锌/过氧化氢/人工太阳光氧化体系中，吡虫啉几乎完全矿化。在纳米氧化锌/过氧化氢/人工太阳光体系下，羟基自由基光生速率高于正常氧化锌/过氧化氢/人工太阳光体系。高级氧化法，特别是使用纳米氧化锌的高级氧化法，可以被认为是一种有效的光催化去除水中吡虫啉的方法。
In this study, the kinetics of photocatalytic removal of imidacloprid, a systemic chloronicotinoid insecticide, from water using two advanced oxidation systems (ZnO(normal)/H2O2/artificial sunlight and ZnO(nano)/H2O2/artificial sunlight) were investigated. Moreover, the effects of pH, insecticide concentration, catalyst concentration, catalyst particle size, and water type on the photocatalytic removal of imidacloprid were evaluated. Furthermore, total mineralization of imidacloprid under these advanced oxidation systems was evaluated by monitoring the decreases in dissolved organic carbon (DOC) concentrations and formation rate of inorganic ions (Cl- and NO2-) with irradiation time using total organic carbon (TOC) analysis and ion chromatography to confirm the complete detoxification of imidacloprid in water. The degradation rate of imidacloprid was faster under the ZnO(nano)/H2O2/artificial sunlight system than the ZnO(normal)/artificial sunlight system in both pure and river water. The photocatalytic degradation of imidacloprid under both advanced oxidation systems was affected by pH, catalyst concentration, imidacloprid concentration, and water type. Almost complete mineralization of imidacloprid was only achieved in the ZnO(nano)/H2O2/artificial sunlight oxidation system. The photogeneration rate of hydroxyl radicals was higher under the ZnO(nano)/H2O2/artificial sunlight system than the ZnO(normal)/H2O2/artificial sunlight system. Advanced oxidation processes, particularly those using nanosized zinc oxide, can be regarded as an effective photocatalytic method for imidacloprid removal from water.