Arsenic removal by adsorption on iron(III) phosphate

Under natural conditions, arsenic is often associated with iron oxides and iron(III) oxidative capacity towards As(III) is well known. In this study, As(III) and As(V) removal was performed using synthesised iron(III) phosphate, either amorphous or crystalline. This solid can combine (i) As(III) oxi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hazardous materials 2005-08, Vol.123 (1), p.262-268
Main Authors: Lenoble, Véronique, Laclautre, Christelle, Deluchat, Véronique, Serpaud, Bernard, Bollinger, Jean-Claude
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Arsenic
Arsenic - isolation & purification
Chemical engineering
Chemical Precipitation
Crystallization, leaching, miscellaneous separations
Environmental Engineering
Environmental Sciences
Exact sciences and technology
Ferric Compounds - chemistry
Hazardous Waste - prevention & control
Iron(III) phosphate
Other industrial wastes. Sewage sludge
Pollution
Reactors
Wastes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Under natural conditions, arsenic is often associated with iron oxides and iron(III) oxidative capacity towards As(III) is well known. In this study, As(III) and As(V) removal was performed using synthesised iron(III) phosphate, either amorphous or crystalline. This solid can combine (i) As(III) oxidation by iron(III) and (ii) phosphate substitution by As(V) due to their similar properties. Results showed that adsorption capacities were higher towards As(III), leading to Fe 2+ and HAsO 4 2− leaching. Solid dissolution and phosphate/arsenate exchange led to the presence of Fe 3+ and PO 4 3− in solution, therefore various precipitates involving As(V) can be produced: with Fe 2+ as Fe 3(AsO 4) 2·8H 2O (s) and with Fe 3+ as FeAsO 4·2H 2O (s). Such formations have been assessed by thermodynamic calculations. This sorbent can be a potential candidate for industrial waste treatment, although the high release of phosphate and iron will exclude its application in drinking water plants.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2005.04.005