Cation exchange resin supported nanoscale zero-valent iron for removal of phosphorus in rainwater runoff

Bangmi XIE, Jiane ZUO, Lili GAN, Fenglin LIU, Kaijun WANG

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PDF(318 KB)
Front. Environ. Sci. Eng. ›› 2014, Vol. 8 ›› Issue (3) : 463-470. DOI: 10.1007/s11783-013-0575-3
RESEARCH ARTICLE

Cation exchange resin supported nanoscale zero-valent iron for removal of phosphorus in rainwater runoff

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Abstract

Self-made cation exchange resin supported nanoscale zero-valent iron (R-nZVI) was used to remove phosphorus in rainwater runoff. 80% of phosphorus in rainwater runoff from grassland was removed with an initial concentration of 0.72 mg·L–1 phosphorus when the dosage of R-nZVI is 8 g per liter rainwater, while only 26% of phosphorus was removed when using cation exchange resin without supported nanoscale zero-valent iron under the same condition. The adsorption capacity of R-nZVI increased up to 185 times of that of the cation exchange resin at a saturated equilibrium phosphorous concentration of 0.42 mg·L–1. Various techniques were implemented to characterize the R-nZVI and explore the mechanism of its removal of phosphate. Scanning electron microscopy (SEM) indicated that new crystal had been formed on the surface of R-nZVI. The result from inductive coupled plasma (ICP) indicated that 2.1% of nZVI was loaded on the support material. The specific surface area was increased after the load of nanoscale zero-valent iron (nZVI), according to the measurement of BET-N2 method. The result of specific surface area analysis also proved that phosphorus was removed mainly through chemical adsorption process. X-ray photoelectron spectroscopy (XPS) analysis showed that the new product obtained from chemical reaction between phosphate and iron was ferrous phosphate.

Keywords

nanoscale zero-valent iron(R-nZVI) / cation exchange resin / rainwater runoff / phosphorus adsorption

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Bangmi XIE, Jiane ZUO, Lili GAN, Fenglin LIU, Kaijun WANG. Cation exchange resin supported nanoscale zero-valent iron for removal of phosphorus in rainwater runoff. Front.Environ.Sci.Eng., 2014, 8(3): 463‒470 https://doi.org/10.1007/s11783-013-0575-3

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Acknowledgements

This research was supported by the Chinese National Special Science & Technology Project on Treatment and Control of Water Pollution (Nos. 2011ZX07301-002 and 2011ZX07213-001).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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