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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. 5, 2015, pp. 1677-1686
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Bioline Code: st15156
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. 5, 2015, pp. 1677-1686
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Characterization of activated Acacia nilotica seed pods for adsorption of Nickel from aqueous solution
Thenmozhi, R. & Santhi, T.
Abstract
The use of low-cost adsorbent has been investigated
in the removal of nickel ions from aqueous solution.
The adsorption of nickel is strongly dependent on various
parameters such as pH, dosage, contact time and initial
concentration of metal. The optimum pH for nickel
removal is found to be 7.0. The removal of nickel ions
increases with time and attains saturation in about
60–120 min. The experimental data were analyzed with
various isotherms such as Freundlich, Langmuir Temkin
and Dubinin–Radushkevich adsorption isotherm. The
experimental data were fitted into the following kinetic
models: Lagergren pseudo-first order, the chemisorption
pseudo-second order, Elovich kinetic model, and the
intraparticle diffusion model. It was observed that chemisorption
pseudo-second-order kinetic model described the
sorption process with high coefficients of determination
better than any other kinetic models. The results indicate
that the second-order model best describes adsorption
kinetic data. The adsorbent was characterized; functional
group was analyzed by Fourier transform infrared spectroscopy
and surface morphology by scanning electron
microscope, and energy dispersive X-ray diffraction were
analysed.
Keywords
Adsorption; Acacia nilotica; Nickel; Isotherms; Kinetics
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