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Modeling arsenic(V) removal from water by sulfate modified iron-oxide coated sand (SMIOCS)

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Title Modeling arsenic(V) removal from water by sulfate modified iron-oxide coated sand (SMIOCS)
 
Creator VAISHYA, RC
GUPTA, SK
 
Subject arsenate adsorption
surface-chemistry
natural waters
ferrihydrite
goethite
groundwater
kinetics
arsenic(v) removal
water
sulfate modified iron-oxide coated sand
 
Description The batch kinetics of arsenic(V) on a novel media developed by coating BaSO4 and Fe on quartz sand, known as sulfate modified iron-oxide coated sand (SMIOCS), was investigated. Batch rate data were analyzed using active available site and chemical reaction rate models. The batch kinetic data were a better fit on an active, available site model as compared to a chemical reaction rate model. The media was characterized for certain chemical properties and surface area. The media showed alkali resistance with the presence of iron, barium, and sulfur on the surface. The Langmuir and Freundlich isotherm equations could be used to describe the partitioning behavior of system at different pH. The removal of As(V) on SMIOCS was pH dependent and maximum removal was observed in acidic pH range. The variation in ionic strength and chloride (Cl-) concentration in the solute do not play a significant role in As(V) removal efficiency but major anions showed some reduction in As(V) removal efficiency. A very small concentration of silica drastically reduced arsenic removal efficiency. However, the presence of Ca2+ and Mg2+ as cations improved arsenic(V) removal efficiency. The fixed bed studies indicated that the breakthrough time for arsenic(V) removal is dependent on the initial influent arsenic concentrations. These results suggest that arsenate adsorption on SMIOCS media may play an important role for arsenic immmobilization.
 
Publisher MARCEL DEKKER INC
 
Date 2011-08-18T10:46:38Z
2011-12-26T12:55:42Z
2011-12-27T05:42:08Z
2011-08-18T10:46:38Z
2011-12-26T12:55:42Z
2011-12-27T05:42:08Z
2004
 
Type Article
 
Identifier SEPARATION SCIENCE AND TECHNOLOGY, 39(3), 645-666
0149-6395
http://dx.doi.org/10.1081/SS-120027999
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9984
http://hdl.handle.net/10054/9984
 
Language en