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Uptake properties of phosphate on a novel Zr-modified MgFe-LDH(CO3)
被引:52
作者:
Chitrakar, Ramesh
[1
]
Tezuka, Satoko
[1
]
Hosokawa, Junji
[1
]
Makita, Yoji
[1
]
Sonoda, Akinari
[1
]
Ooi, Kenta
[1
]
Hirotsu, Takahiro
[1
]
机构:
[1] Natl Inst Adv Ind Sci & Technol, Hlth Res Inst, Takamatsu, Kagawa 7610395, Japan
关键词:
Layered double hydroxides;
Composite;
Selectivity;
Phosphate;
Seawater;
LAYERED DOUBLE HYDROXIDES;
COMPETITIVE ADSORPTION;
SURFACE PRECIPITATION;
ALUMINUM HYDROXIDES;
AQUEOUS-SOLUTIONS;
GOETHITE;
REMOVAL;
SEAWATER;
IRON;
PHOSPHORUS;
D O I:
10.1016/j.jcis.2010.05.068
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
We prepare(d) a novel Zr-modified MgFe-LDH(CO3) composite by adding a mixed solution of MgCl2, FeCl3, and ZrOCl2 and another mixed solution of 1 mol/dm(3) NaOH and 1 mol/dm(3) Na2CO3 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 (0.33 mg-P/dm(3)) than amorphous zirconium oxide and MgFe-LDH(CO3). 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(CO3) composite probably causes the marked increase in phosphate uptake from P-enriched seawater. (C) 2010 Elsevier Inc. All rights reserved.
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页码:314 / 320
页数:7
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