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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. 1719-1726
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Bioline Code: st15160
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. 1719-1726
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A novel manganese-oxide/biochar composite for efficient removal of lead(II) from aqueous solutions
Wang, M.C.; Sheng, G.D. & Qiu, Y.P.
Abstract
Biochar (BC) derived from pyrolysis of plant
biomass can be used as an inexpensive adsorbent for
removal of aqueous heavy metals. In the present study,
amorphous hydrous manganese oxide was loaded onto BC
to fabricate a novel manganese-oxide/biochar (Mn/BC)
composite for further enhancing lead(II) removal by sorption
from water. Mn/BC was characterized by X-ray diffraction,
scanning electron microscope, and specific
surface area analysis. After impregnation with 3.65 % Mn,
BC raised the removal efficiency of lead(II) from 6.4 to
98.9 % at pH 5.00. This improvement is attributed to the
increase in surface hydroxyls and the decrease in pHPZC
(pH at the point of zero charge) of carbon. The maximum
monolayer adsorption of lead(II) on Mn/BC at 298 K was
five times that on BC. The smaller pseudo-second-order
rate constant of Mn/BC compared with that of BC indicated
that the sorption rate of Mn/BC is faster than that of
BC. The calculated thermodynamic parameters implied
that the sorption of lead(II) is a spontaneous and endothermic
process. The results suggest that Mn/BC composite
is a promising adsorbent for the efficient removal of lead(
II) from water.
Keywords
Biochar; Removal; Sorption; Manganese oxide; Lead(II)
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