M. D. de Luna, Joseph D. Retumban, Sergi Garcia-Segura, Ming-Chun Lu
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引用次数: 8
摘要
摘要吡虫啉是农业上应用最广泛的杀虫剂之一。由于通常与杀虫剂有关的有害影响,这种高度顽固的污染物及其在水中不完全降解的副产品的命运引起了人们的极大关注。本文讨论了传统Fenton法原位生成羟基自由基对吡虫啉的降解。此外,还研究了丙二醇对传统Fenton工艺性能的影响,丙二醇是含吡虫啉的商业农药中常见的赋形剂。观察到两个阶段的降解动力学:(i)在处理的前5分钟快速初始衰变,然后(ii)由Fe2+催化剂再生的芬顿样反应定义的较慢动力学。考察了Fe2+和H2O2初始浓度或丙二醇比等几个变量对吡虫啉减效的影响。实验结果表明,在8.0 mM H2O2和0.8 mM Fe2+的最佳条件下,在酸性ph下处理120 min后,吡虫啉可以完全去除。然而,由于羟基自由基的竞争性消耗,丙二醇浓度的增加会降低整体性能。
Degradation of imidacloprid insecticide in a binary mixture with propylene glycol by conventional fenton process
Abstract Imidacloprid is one of the most widely used insecticides in agriculture. The fate of this highly recalcitrant pollutant and its by-product of incomplete degradation in water is of great concern due to the hazardous effects usually associated to pesticides. In the present manuscript, imidacloprid degradation by hydroxyl radical produced in-situ by conventional Fenton process is discussed. Furthermore, it has been studied the influence of propylene glycol, which is a usual excipient found in the commercial pesticides containing imidacloprid, on the conventional Fenton process performance. A two-stage degradation kinetics was observed: (i) a rapid initial decay on the first 5 min of treatment, followed by (ii) a slower kinetics defined by the Fenton-like reaction of Fe2+ catalyst regeneration. The influence of several variables on the abatement of imidacloprid such Fe2+ and H2O2 initial concentration or propylene glycol ratios have been evaluated. Experimental results demonstrate that complete imidacloprid abatement is attained under optimal conditions of 8.0 mM of H2O2 and 0.8 mM of Fe2+ after 120 min of treatment at acidic pH. However, increasing concentrations of propylene glycol diminishes the overall performance due to the competitive consumption of hydroxyl radicals.
期刊介绍:
The Journal of advanced oxidation technologies (AOTs) has been providing an international forum that accepts papers describing basic research and practical applications of these technologies. The Journal has been publishing articles in the form of critical reviews and research papers focused on the science and engineering of AOTs for water, air and soil treatment. Due to the enormous progress in the applications of various chemical and bio-oxidation and reduction processes, the scope of the Journal is now expanded to include submission in these areas so that high quality submission from industry would also be considered for publication. Specifically, the Journal is soliciting submission in the following areas (alphabetical order): -Advanced Oxidation Nanotechnologies -Bio-Oxidation and Reduction Processes -Catalytic Oxidation -Chemical Oxidation and Reduction Processes -Electrochemical Oxidation -Electrohydraulic Discharge, Cavitation & Sonolysis -Electron Beam & Gamma Irradiation -New Photocatalytic Materials and processes -Non-Thermal Plasma -Ozone-based AOTs -Photochemical Degradation Processes -Sub- and Supercritical Water Oxidation -TiO2 Photocatalytic Redox Processes -UV- and Solar Light-based AOTs -Water-Energy (and Food) Nexus of AOTs