Record Details

Modelling arsenic(III) adsorption from water by sulfate-modified iron oxide-coated sand (SMIOCS)

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Modelling arsenic(III) adsorption from water by sulfate-modified iron oxide-coated sand (SMIOCS)
 
Creator VAISHYA, RC
GUPTA, SK
 
Subject drinking-water
removal
arsenate
groundwater
filtration
sorption
arsenite
metals
batch
arsenic
chemisorption
coating
isotherms
kinetic model
quartz sand
 
Description A medium developed by coating BaSO4 and Fe on quartz sand known as sulfate-modified iron oxide-coated sand (SMIOCS) was evaluated for the removal of arsenic(III) from simulated water with an ionic strength of 0.01M NaNO3 during batch studies. The medium was characterised for BET surface area, alkali-resistance, acid-resistance and the presence of iron and barium on the coated surface. Two simplified kinetic models, ie active available site (AAS) and chemical reaction rate models, were tested to investigate the adsorption mechanisms. The values of rate constants for both the models were found to decrease with increasing As(Ill) concentrations in the solute. The inverse relationship of rate constants of the reaction rate model with BET surface area showed that As(III) adsorption on SMIOCS was not due to physisorption but to chemisorption. A study of the effect of solute temperature showed that the adsorption of As(III) on SMIOCS media was due to chemisorption. The results of isothermal studies conducted at different pH values showed that adsorption data satisfied both the Langmuir and the Freundlich isotherm models. The adsorption of As(III) on the medium was pH dependent and maximum removal was observed in the pH range of 7-9. (C) 2002 Society of Chemical Industry.
 
Publisher JOHN WILEY & SONS LTD
 
Date 2011-08-16T22:58:20Z
2011-12-26T12:55:11Z
2011-12-27T05:43:53Z
2011-08-16T22:58:20Z
2011-12-26T12:55:11Z
2011-12-27T05:43:53Z
2003
 
Type Article
 
Identifier JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, 78(1), 73-80
0268-2575
http://dx.doi.org/10.1002/jctb.745
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9654
http://hdl.handle.net/10054/9654
 
Language en