Authors: M A AlAnber
Publish Date: 2013/11/16
Volume: 12, Issue: 1, Pages: 139-150
Abstract
The removing of ferric ions Fe3+ from aqueous solution using natural feldspar NF has been studied in a batch operation mode The factors affecting of the sorption equilibrium such as contact time initial concentration of the ferric ions Fe3+ feldspar dosage concentration and temperature were investigated The maximum removal is 93 approx using lowlevel concentration of Fe3+ ions 30 mg L−1 and high dosage concentration 40 g L−1 The adsorption equilibrium is achieved during the first 90 min Freundlich model has successfully analyzed the equilibrium of isotherms with R 2 = 1 The adsorption mechanism of aqueous ferric ion on NF follows Freundlich isotherm models R 2 = 0997 The capacity K f and intensity 1/n of Freundlich adsorption are 170 and 0621 respectively The results reveal that the adsorption mechanism of ferric ion on NF is chemisorptions heterogeneous multilayer and spontaneous in nature ΔG = −19778 kJ mol−1 Adsorption reaction kinetic models such as pseudofirst order and pseudosecond order and adsorption diffusion model such as Weber–Morris intraparticle diffusion model have been used to describe the adsorption rate and mechanism of the ferric ion onto NF surface Adsorption of ferric ion on the NF has achieved Lagergren pseudosecondorder model R 2 = 10 approx more than Lagergren pseudofirstorder model The kinetic parameters rate constant and sorption capacities have been calculated The new information in this study suggests that NF could be used as a novel filtering materials for removing ferric ions from water
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