Evaluation of electrical energy per order (EEO) with kinetic modeling on the removal of Malachite Green by US/UV/H2O2 process

Abstract

The kinetics of decolorization of Malachite Green (MG) as a model cationic dye from textile industry, by US/UV/H2O2 process, was investigated with nonlinear regression analysis. The experimental results indicated that the decolorization kinetics of MG in this process fit well by pseudo-first order kinetics. With nonlinear regression analysis a model was developed for pseudo-first order constant (kap) as a function of operational parameters such as initial concentrations of H2O2 (25–600 mg l− 1) and MG (1.82–9.87 mg l− 1), temperature (294–307 K) and power density (0.049–0.16 W ml− 1) as following: kap=283exp(−9000/RT)(0.0205+(1.76×10−3[H2O2]o1+4.86×10−4[H2O2]o+9.5×10−6[H2O2]o2)[MG]−0.668(P/V)0.313. For electrical energy cost evaluation, the figure-of-merit electrical energy per order (EEO) was estimated from experimental and theoretical data. The results show that EEO is very sensitive to the mentioned operational parameters.