Preparation and evaluation of iron–chitosan composites for removal of As(III) and As(V) from arsenic contaminated real life groundwater

A study on the removal of arsenic from real life groundwater using iron–chitosan composites is presented. Removal of arsenic(III) and arsenic(V) was studied through adsorption at pH 7.0 under equilibrium and dynamic conditions. The equilibrium data were fitted to Langmuir adsorption models and the v...

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Bibliographic Details
Published in:Water research (Oxford) 2009-08, Vol.43 (15), p.3862-3870
Main Authors: Gupta, Anjali, Chauhan, Vivek Singh, Sankararamakrishnan, Nalini
Format: Article
Language:English
Subjects:
adsorbents
Adsorption
Applied sciences
Arsenates - analysis
Arsenates - chemistry
Arsenic
Arsenites - analysis
Arsenites - chemistry
Chitosan
Chitosan - chemistry
Contamination
Environmental Restoration and Remediation
Exact sciences and technology
Granular materials
granules
Groundwater
groundwater contamination
Iron
Iron - chemistry
Other industrial wastes. Sewage sludge
Phosphates - chemistry
Pollution
Regeneration
Removal
Silicates - chemistry
simulation models
Sorbents
sorption isotherms
Sulfates - chemistry
Wastes
Water - chemistry
Water Pollutants, Chemical - analysis
Water Purification - methods
water treatment
Water treatment and pollution
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Summary:A study on the removal of arsenic from real life groundwater using iron–chitosan composites is presented. Removal of arsenic(III) and arsenic(V) was studied through adsorption at pH 7.0 under equilibrium and dynamic conditions. The equilibrium data were fitted to Langmuir adsorption models and the various model parameters were evaluated. The monolayer adsorption capacity from the Langmuir model for iron chitosan flakes (ICF) (22.47 ± 0.56 mg/g for As(V) and 16.15 ± 0.32 mg/g for As(III)) was found to be considerably higher than that obtained for iron chitosan granules (ICB) (2.24 ± 0.04 mg/g for As(V); 2.32 ± 0.05 mg/g for As(III)). Anions including sulfate, phosphate and silicate at the levels present in groundwater did not cause serious interference in the adsorption behavior of arsenate/arsenite. The column regeneration studies were carried out for two sorption–desorption cycles for both As(III) and As(V) using ICF and ICB as sorbents. One hundred and forty-seven bed volumes of As(III) and 112 bed volumes of As(V) spiked groundwater were treated in column experiments using ICB, reducing arsenic concentration from 500 to
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2009.05.040