Uptake properties of phosphate on a novel Zr-modified MgFe-LDH(CO(3))

Journal of Colloid and Interface Science
Ramesh ChitrakarTakahiro Hirotsu

Abstract

We prepared a novel Zr-modified MgFe-LDH(CO(3)) composite by adding a mixed solution of MgCl(2), FeCl(3), and ZrOCl(2) and another mixed solution of 1mol/dm(3) NaOH and 1mol/dm(3) Na(2)CO(3) to distilled water at a constant pH of 10. The composite exhibited only a poorly crystalline structure, resembling that of layered double hydroxides (LDH) from X-ray diffraction. The phosphate uptake is dependent on pH, decreasing with an increase in pH. This composite shows a much greater uptake of phosphate ions in P-enriched seawater (0.33mg-P/dm(3)) than amorphous zirconium oxide and MgFe-LDH(CO(3)). The uptake isotherm was fitted with a Freundlich relation. These phosphate-uptake behaviors closely resemble those of the relevant Zr-MgAl-LDH, which is estimated to be a composite of MgAl-LDH with amorphous zirconium hydroxide on the surface from X-ray absorption spectroscopy. Therefore, a similar structure of Zr-modified MgFe-LDH(CO(3)) composite probably causes the marked increase in phosphate uptake from P-enriched seawater.

References

Jan 15, 1996·Journal of Colloid and Interface Science·P PerssonS Sjöberg
Sep 22, 2000·Journal of Colloid and Interface Science·L Li, R Stanforth
Jun 1, 2005·Journal of Colloid and Interface Science·Ramesh ChitrakarTakahiro Hirotsu
Jun 1, 2005·Journal of Colloid and Interface Science·Konstantinos C MakrisHassan El-Shall
Dec 13, 2005·Journal of Colloid and Interface Science·Ramesh ChitrakarTakahiro Hirotsu
Feb 4, 2006·Journal of Colloid and Interface Science·Ramesh ChitrakarTakahiro Hirotsu
May 19, 2007·Journal of Colloid and Interface Science·Ramesh ChitrakarTakahiro Hirotsu
Dec 17, 2009·Journal of Colloid and Interface Science·Hongmei HeXiaojing Yang

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Citations

Sep 8, 2012·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Yufeng ChenJunchao Wei
Mar 3, 2020·Chemical & Pharmaceutical Bulletin·Fumihiko OgataNaohito Kawasaki
Oct 4, 2012·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Tomohito KamedaToshiaki Yoshioka

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