期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 189, 期 1-2, 页码 586-594出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.02.078
关键词
Triphosphate; Layered double hydroxide (LDH); Intercalation; Dissolution; Precipitation
资金
- National Nature Science Foundation of China [20677037, 20877053]
- National Major Science and Technology Program for Water Pollution Control and Treatment [2009ZX07106-01, 2008ZX0742-002]
- Shanghai Leading Academic Discipline Project [S30109]
- Australian Research Council for the ARC Centre of Excellence for Functional Nanomaterials
- ARC [DP0870769]
- China Scholarship Council [2009689027]
- Shanghai University Innovative Foundation for High Degree Student
Triphosphate (TPP) is an important form of phosphate pollutants while its removal investigation has been just started now. This research examined the removal of triphosphate using Mg(2-x)Ca(x)FeCl-LDH (x = 0-2) as absorbents. We found that the removal of triphosphate over Mg(2)FeCl-LDH mainly underwent the surface adsorption and the near-edge intercalation, with the practical removal amount (9-11 mg(P)/g) corresponding to 10-15% of the theoretical one. In contrast, Ca(2)FeCl-LDH removed a higher amount of triphosphate (56.4 mg(P)/g). The comprehensive analysis of the triphosphate-uptake products with XRD/XPS/FTIR reveals that Ca(2)FeCl-LDH dissolves first and then released Ca(2+) ions react with triphosphate (TPP) to form insoluble Ca-TPP precipitate. Combination of these two different removal mechanisms enables Mg(0.5)Ca(1.5)FeCl-LDH to take up 84.2 mg(P)/g from aqueous solution under similar conditions. (C) 2011 Elsevier B.V. All rights reserved.
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