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Issue 54, 2016, Issue in Progress
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Optimization of ammonia nitrogen removal by SO42− intercalated hydrotalcite using response surface methodology

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Abstract

SO42− intercalated Mg–Al hydrotalcite (S-LDH) was prepared under microwave irradiation and characterized by powder X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The S-LDH had a typical layered structure containing SO42− anions, and intercalation of SO42− into the interlayer spaces caused reduction of crystallinity and crystal sizes compared to the Mg–Al hydrotalcite precursor. Furthermore, the Box–Behnken design, an experimental design for response surface methodology (RSM), was used to study the NH3–N removal by S-LDH under microwave irradiation. The parameters including S-LDH amount, irradiation time, temperature and initial pH were optimized by RSM. From the analysis of variance, it was found that RSM could be used effectively to model and improve the NH3–N removal efficiency. The optimum conditions were 1.0 g L−1 of the S-LDH, 9.0 min, 70 °C and initial pH 10.0 to achieve 90.4% of the NH3–N removal rate. Overall, the S-LDH showed a high performance under moderate operating conditions for NH3–N removal.

Graphical abstract: Optimization of ammonia nitrogen removal by SO42− intercalated hydrotalcite using response surface methodology

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Publication details

The article was received on 31 Mar 2016, accepted on 10 May 2016 and first published on 11 May 2016


Article type: Paper
DOI: 10.1039/C6RA08321H
Citation: RSC Adv., 2016,6, 48329-48335
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    Optimization of ammonia nitrogen removal by SO42− intercalated hydrotalcite using response surface methodology

    H. Duan, H. Zeng, H. Xiao, C. Chen, G. Xiao and Q. Zhao, RSC Adv., 2016, 6, 48329
    DOI: 10.1039/C6RA08321H

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