Optimization and mechanisms analysis of indigo dye removal using continuous electrocoagulation  

作　　者：Kamel Hendaoui Malika Trabelsi-Ayadi Fadhila Ayari 

机构地区：[1]Laboratory of Applications of Chemistry to Natural Resources and Substances and the Environment(LACReSNE),University of Carthage,Faculty of Sciences of Bizerte,Zarzouna 7021,Tunisia

出　　处：《Chinese Journal of Chemical Engineering》2021年第1期242-252,共11页中国化学工程学报（英文版）

摘　　要：Electrocoagulation(EC) is among the most effective techniques that remove color and decontaminate effluent.Coagulants are delivered in situ by anode corrosion.In this research,indigo dye removal using iron electrodes in continuous electrocoagulation process and the responsible species for decolorization were investigated.The Response Surface Methodology(RSM) was used to optimize the process parameters.The finding in this study shows that at fixed conductivity at 15,000 μS·cm^(-1) the neutral conditions(pH from 6 to 8),the low absorbance,the low flow rate and the high voltage level enhance the color removal efficiency.The high R~2 value of 97.8% and ANOVA analyses show a good correlation between the experimental and predicted results.Under the optimum conditions,which are pH of 7.5, solution concentration of 60 mg·L^(-1), inlet flow rate of 2 L·min^(-1) and voltage of 47 V, the predicted decolorization of 94.083% was achieved at 93.972% with a total cost of 0.0927 USD·m^(-3) of treated effluent.At the optimum pH(7.5),the zeta potential value(-4 mV) of the effluent during EC match with the one of iron Ⅲ hydroxide.The dye removal is ensured thanks to physical adsorption and flocculation.The results exposed in this work prove that the continuous electrocoagulation process could be successfully used for indigo dye removal at industrial scale.

关 键 词：Continuous electrocoagulation ADSORPTION Parameter estimation Response surface methodology OPTIMIZATION Zeta potential 

分 类 号：X703[环境科学与工程—环境工程]