Optimization of operational parameters by Taguchi design for imidacloprid oxidation by microwave‐activated persulfate

Abstract

In this study, imidacloprid oxidation by microwave‐activated persulfate was investigated. Imidacloprid was exposed to microwave (MW) irradiation at different persulfate concentration, power level, contact time, and pH. Reaction between imidacloprid and sulfate radical followed the secondary order kinetic model. Taguchi's robust design approach was used to optimize the imidacloprid oxidation. Experimentation was planned as per Taguchi's L9 orthogonal array. The optimum levels of control factors for maximum imidacloprid oxidation were defined (power at 700 W, contact time at 6 min, persulfate concentration at 0.129 g/L (power density 5.42 W/g oxidant), pH at 6.5). The analysis of variance analysis shown that the the most effective control factor is power, its contribution is 69.2%. A confirmation experiment was conducted to verify the feasibility and effectiveness of the optimal combination. The observed value of S/N (ηobs = 38.8) ratio is compared with that of the predicted value (ηopt = 45.4). The prediction error, that is, ηopt ‐ ηobs = 6.6, is within the confidence interval (CI) value. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1632–1637, 2018

Removal of insecticides from waters and soils by sulfate radical‐based advanced oxidation processes

“…As pointed out above, most works related to insecticides remediation from PS‐ and PMS‐based processes have been made with aqueous mixtures [31–58]. Thermal, catalytic, UV (without and with Fe), and photocatalytic activations, as well as other methods including electrochemical and microwave processes, have been majority developed at laboratory scale.…”

“…On the other hand, Genç and Durna [58] applied electromagnetic microwaves of high energy to activate PS by reaction (36), similar to reaction (1), because it triggers rapid heating of the solution.…”

“…On the other hand, Genç and Durna [58] applied electromagnetic microwaves of high energy to activate PS by reaction (), similar to reaction (), because it triggers rapid heating of the solution. $$${{\rm{S}}}_{2}{{\rm{O}}}_{8}^{2-}+\text{microwave}\to 2{\text{SO}}_{4}^{\,\bullet -}.$$$…”

Application of a multiple criteria analysis for the selection of appropriate radical based processes in treatment of car wash wastewater

“…Among the advanced treatment technologies, microwave (MW) technology has gained attention with its advantages such as short reaction time, high energy efficiency, fast heating and high reaction speed. Since MW's energy cannot break the chemical bonds of recalcitrant pollutants alone, it is common to use MW in combination with adsorbents, oxidants, catalysts, and AOPs [27,28]. An activator is required to obtain SO 4…”