2-Amino-4-acetaminoanisole (AMA) is an intermediate product in the synthesis of many commercial dyes, and its wide application has led to the generation of a series of AMA dye wastewater. Discharge of untreated AMA dyed wastewater could bring environmental concerns. The present study featured H2O2 Fenton system to degrade 2-amino-4-acetaminoanisole from wastewater using nano-Fe3O4 catalyst prepared via the co-precipitation method. Furthermore, the Box-Behnken design (BBD) response surface method was used to investigate the individual effects of Fe3O4 dosage, H2O2 dosage, initial pH, and reaction time on AMA removal, while in the interaction study, the Design-Expert 10.0 software was applied to obtain a quadratic response surface model. Results indicated that the catalytic effect of nano-Fe3O4 showed better degradation performance as compared to FeSO4 Fenton system. The order of the influence of the selected independent variables on the response value is as follows: nano-Fe3O4 dosage > H2O2 dosage > reaction time > pH. As for 3.04 × 105 μg/L of AMA dye wastewater, the optimal reaction conditions considered in this study are 1.70 g/L of nano-Fe3O4 dosage, 53.52 mmol/L of H2O2 dosage, pH 5.14, and 388.97 min as system reaction time. Furthermore, HPLC-MS was employed to analyze the degradation mechanism of AMA and the reaction intermediate products. Possible degradation pathways of AMA by radicals were addressed. Findings of this research provide fundamental theory and guide practical AMA treatment during wastewater treatment.
Keywords: AOPs; Box-Behnken response surface method; Dye intermediate; Nano materials.
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.