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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 2, 2015, pp. 571-580
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Bioline Code: st15052
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 2, 2015, pp. 571-580
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Characteristics, kinetics and thermodynamics of Congo Red biosorption by activated sulfidogenic sludge from an aqueous solution
Rasool, K. & Lee, D.S.
Abstract
The kinetics and thermodynamics of the biosorption
of textile dye Congo Red on anaerobic activated
sulfidogenic sludge were examined. The influence of different
adsorption parameters such as pH, temperature,
contact time and initial dye concentrations on the biosorption
capacity was also investigated. The sulfidogenic
sludge showed a maximum biosorption density of
238.90 mg dye/g cell for Congo Red at an initial dye
concentration of 1,000 mg/L, pH 3.5 and 22 °C, which is
higher than that of many other adsorbents reported in the
literature. The biosorption processes obeyed the Langmuir
isotherm and exhibited pseudo-second-order rate kinetics.
The thermodynamic parameters indicated the spontaneous
and exothermic nature of Congo Red biosorption. The
Fourier transform infrared spectra revealed the dye interaction
with the biomass. Scanning electron microscopy
showed significant changes in the surface morphology of
the sludge after dye biosorption. These results showed that
sulfidogenic sludge biomass is an attractive alternative
low-cost biosorbent for the removal of the dye from
aqueous media.
Keywords
Biosorption; Congo Red; Isotherms; Thermodynamics; Sulfidogenic sludge
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