Abstract
A simple electrochemical method is proposed for recovering iron from steel pickling waste liquor with graphite plates as electrodes. In this study, response surface methodology (RSM) was used to optimize the experimental conditions and assess the effect of the process variables, including initial pH, reaction temperature (T), current density (J), and reaction time (t), on total iron (TFe) removal. The model obtained by analyzing data with Design Expert 8.0.6 was very significant, and pH had the most significant effect on TFe removal. The optimum reaction conditions were pH = 9, T = 35 °C, J = 20.07 mA/cm2, and t = 30 min, under which conditions the removal rate was more than 99.99%, the residual TFe = 0.28 mg/L at the initial TFe of 10 g/L, and the obtained product had strong magnetism. Therefore, the method of electrochemical synthesis of Fe3O4 is promising in the treatment and recycling of steel pickling waste liquor.
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The authors sincerely appreciate the help of the analysts from Center of Analysis and Test, Laboratory for Resource and Environmental Education, and School of Chemical Engineering in East China University of Science and Technology.
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Gao, S., Chen, J. & Huang, G. Process Optimization of Steel Pickling Waste Liquor Treated by Electrochemical Synthesis of Fe3O4. Water Air Soil Pollut 233, 365 (2022). https://doi.org/10.1007/s11270-022-05835-y
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DOI: https://doi.org/10.1007/s11270-022-05835-y