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Kinetics and optimization on discoloration of dyeing wastewater by schorl-catalyzed fenton-like reaction

Xu Huan-Yan (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, P.R. China)
Liu Wei-Chao (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, P.R. China)
Qi Shu-Yan (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, P.R. China)
Li Yan (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, P.R. China)
Zhao Yuan (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, P.R. China)
Li Ji-Wei (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, P.R. China)

Kinetics and optimization on the discoloration of an active commercial dye, Argazol Blue BFBR (ABB) by heterogeneous Fenton-like reaction catalyzed by natural schorl were investigated in this study. Kinetic investigations revealed that the first-order kinetic model was more favorable to describe the discoloration of ABB at different reaction conditions than the second-order and Behnajady-Modirshahla-Ghanbery models. The relationship between the reaction rate constant k and reaction temperature T followed the Arrhenius equation, with the apparent activation energy Ea of 51.31kJ•mol-1. The central composite design under the response surface methodology was employed for the experimental design and optimization of the ABB discoloration process. The significance of a second order polynomial model for predicting the optimal values of ABB discoloration was evaluated by the analysis of variance and 3D response surface plots for the interactions between two variables were constructed. Then, the optimum conditions were determined.

Keywords: schorl, heterogeneous catalysis, Argazol Blue BFBR, response surface methodology, first-order kinetics