Premium
Removal of Arsenic from Simulated Groundwater Using GAC‐Ca in Batch Reactor: Kinetics and Equilibrium Studies
Author(s) -
Mondal Prasenjit,
Mohanty Bikash,
Majumder Chandrajit Balo
Publication year - 2012
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201000274
Subject(s) - arsenic , adsorption , chemistry , freundlich equation , kinetics , diffusion , langmuir , activated charcoal , langmuir adsorption model , groundwater , environmental chemistry , nuclear chemistry , inorganic chemistry , chromatography , thermodynamics , organic chemistry , geology , physics , geotechnical engineering , quantum mechanics
This paper deals with kinetics and equilibrium studies on the adsorption of arsenic species from simulated groundwater containing arsenic (As(III)/As(V), 1:1), Fe, and Mn in concentrations of 0.188, 2.8, and 0.6 mg/L, respectively, by Ca 2+ impregnated granular activated charcoal (GAC‐Ca). Effects of agitation period and initial arsenic concentration on the removal of arsenic species have also been described. Although, most of the arsenic species are adsorbed within 10 h of agitation, equilibrium reaches after ∼24 h. Amongst various kinetic models investigated, the pseudo second order model is more adequate to explain the adsorption kinetics and film diffusion is found to be the rate controlling step for the adsorption of arsenic species on GAC‐Ca. Freundlich isotherm is adequate to explain the adsorption equilibrium. However, empirical polynomial isotherm gives more accurate prediction on equilibrium specific uptakes of arsenic species. Maximum specific uptake ( q max ) for the adsorption of As(T) as obtained from Langmuir isotherm is 135 µg/g.