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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. 11, No. 5, 2014, pp. 1439-1448
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Bioline Code: st14140
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. 11, No. 5, 2014, pp. 1439-1448
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Adsorption of anionic dye on magnesium hydroxide-coated pyrolytic bio-char and reuse by microwave irradiation
Zhang, X.N.; Mao, G.Y.; Jiao, Y.B.; Shang, Y. & Han, R.P.
Abstract
Magnesium hydroxide-coated pyrolytic biochar
composite was prepared by chemical precipitation,
and the adsorption behavior of anionic dye (directly frozen
yellow) onto magnesium hydroxide-coated pyrolytic biochar
was investigated in the batch mode. The Fourier
transform infrared spectroscopy, X-ray diffraction spectroscopy
and X-ray fluorescence spectroscopy of adsorbents
were characterized. Adsorption studies were
performed at different pH, salt concentration, contacting
time and dye concentration. The pH value of the solution
influenced the adsorption capacity significantly, and
adsorption is favored of pH 6–8. Salt coexisted in solution
increased slightly directly frozen yellow adsorption
capacity. The isotherm data were analyzed by Langmuir
and Freundlich isotherm model, and Langmuir model was
better to predict the equilibrium data. Thermodynamic
calculations showed that the adsorption was a spontaneous
and endothermic process. Exhausted magnesium hydroxide-
coated pyrolytic bio-char was treated by microwave
irradiation, and yield of regeneration was 98 % in the case
of microwave irradiated time 5 min at 320 W. The magnesium
hydroxide-coated pyrolytic bio-char can be reused.
Keywords
Adsorption isotherm; Characterization; Directly frozen yellow; Regeneration; Thermodynamic parameters
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