Abstract
The removal of ammonia nitrogen from wastewater is always a focus in current water treatment. In this study, a combination of mesoporous carbon electrode and selective ion exchange membrane was used to assemble a membrane capacitor deionization system (MCDI). The optimal process parameters were determined as follows: the plate spacing was 1 mm, the voltage was 1.2 V, and the flow rate was 23.8 mL/min. Under the optimal conditions, the removal efficiency of ammonia nitrogen can reach more than 80%. The quasi-first order kinetics and Langmuir adsorption isotherm model can well describe the adsorption process of MCDI. The nature of physical adsorption between ammonia nitrogen cations and mesoporous carbon electrode was demonstrated by the calculation of activation energy and thermodynamic parameters. Moreover, 1500 mg/L NH4Cl, NaNO2, and NaNO3 solutions were tested respectively. The results showed that the removal efficiencies of NH4+, NO2−, and NO3− were 82.33%, 90.96%, and 97.73% respectively, indicating that MCDI is feasible to removal different forms of inorganic nitrogen from water.
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The datasets used during this study are available from the authors on reasonable request.
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Funding
The authors thank the financial support from the Tianjin Natural Science Foundation (Grant No. 17JCTPJC54300) and Tianjin Education Commission Project (Grant No. 2019KJ218).
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G.J. L. designed the synthesis of mesoporous carbon electrode and proposed the idea of MCDI for ammonia removal. Y. C. and Z. Z. synthesized the electrode and carried out the experimental plans. L. H. helped to analyze the experimental data and studied the electrosorption mechanism of ammonia removal.
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Li, G., Cao, Y., Zhang, Z. et al. Removal of ammonia nitrogen from water by mesoporous carbon electrode–based membrane capacitance deionization. Environ Sci Pollut Res 28, 7945–7954 (2021). https://doi.org/10.1007/s11356-020-11109-z
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DOI: https://doi.org/10.1007/s11356-020-11109-z