Arsenic removal by electrocoagulation using combined Al–Fe electrode system and characterization of products

Combination of electrodes, such as aluminum and iron in a single electrochemical cell provide an alternative method for removal of arsenic from water by electrocoagulation. The removal process has been studied with a wide range of arsenic concentration (1–1000 ppm) at different pH (4–10). Analysis o...

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Bibliographic Details
Published in:	Journal of hazardous materials Vol. 139; no. 2; pp. 220 - 231
Main Authors:	Gomes, Jewel A.G., Daida, Praveen, Kesmez, Mehmet, Weir, Michael, Moreno, Hector, Parga, Jose R., Irwin, George, McWhinney, Hylton, Grady, Tony, Peterson, Eric, Cocke, David L.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 10-01-2007 Elsevier
Subjects:	Adsorption Aluminum - chemistry Aluminum Compounds - analysis Applied sciences Arsenic - isolation & purification Arsenic removal Chemical engineering Combined Al–Fe electrode system Electrochemistry Electrocoagulation Electrodes Exact sciences and technology General purification processes Ionic substitution Iron - chemistry Iron Compounds - analysis Microscopy, Electron, Scanning Pollution Spectrum Analysis Wastewater Wastewaters Water Pollutants, Chemical - isolation & purification Water Purification - methods Water treatment and pollution X-Ray Diffraction Arsenic removal Combined Al–Fe electrode system Electrocoagulation Ionic substitution Wastewater Scanning electron microscopy Arsenic Reaction product Combined Al-Fe electrode system Waste water Electrodes Adsorption pH Surface area
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Summary:	Combination of electrodes, such as aluminum and iron in a single electrochemical cell provide an alternative method for removal of arsenic from water by electrocoagulation. The removal process has been studied with a wide range of arsenic concentration (1–1000 ppm) at different pH (4–10). Analysis of the electrochemically generated by-products by XRD, XPS, SEM/EDAX, FT-IR, and Mössbauer Spectroscopy revealed the expected crystalline iron oxides (magnetite (Fe 3O 4), lepidocrocite (FeO(OH)), iron oxide (FeO)) and aluminum oxides (bayerite (Al(OH) 3), diaspore (AlO(OH)), mansfieldite (AlAsO 4·2(H 2O)), as well as some interaction between the two phases. The amorphous or very fine particular phase was also found in the floc. The substitution of Fe 3+ ions by Al 3+ ions in the solid surface has been observed, indicating an alternative removal mechanism of arsenic in these metal hydroxides and oxyhydroxides by providing larger surface area for arsenic adsorption via retarding the crystalline formation of iron oxides.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0304-3894 1873-3336
DOI:	10.1016/j.jhazmat.2005.11.108