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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. 3, 2015, pp. 885-892
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Bioline Code: st15080
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. 3, 2015, pp. 885-892
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Phosphorus removal from aqueous solutions containing low concentration of phosphate using pyrite calcinate sorbent
Chen, T.-H.; Wang, J.-Z.; Wang, J.; Xie, J.-J.; Zhu, C.-Z. & Zhan, X.-M.
Abstract
Natural pyrite was modified by calcination
under nitrogen (N2) atmosphere to produce a novel sorbent
for removing phosphorus (P) with low concentration from
aqueous solutions. The crystallinity, porous texture, magnetic
susceptibility and performance in P removal of pyrite
calcinates depended on calcination temperatures. The sorbent
obtained at calcination temperature of 500–600 °C
possessed the most efficient P removal. Solution pH in the
range of 3.0–9.0 and anions of chloridion (Cl-), nitrate
(NO3)- and sulfate (SO4
2-) had ignorable effect on P
removal. The batch adsorption experiment shows that the
maximum sorption capacities for P of this novel sorbent
(qm) were up to 1.61–5.36 mg P/g at adsorption temperatures
of 15–35 °C. Dynamic sorption and regeneration
experiments were conducted in an adsorption column filled
with pyrite calcined at 600 °C. The study found that oxygen
was an important control factor responsible for P adsorption
because the oxidization of Fe2+ to Fe3+ on the surface of the
sorbent followed by P being bound to a ferric hydroxide
surface film was the crucial processes. The mechanism was
confirmed with surface characterization techniques including
field emission scanning electron microscope and X-ray
photoelectron spectroscopy. This research potentially
provides a cheap, abundant sorbent for P removal from the
secondary effluent of municipal wastewater treatment plant.
Keywords
Calcinations; Low concentration of phosphate; Pyrite; Removal efficiency
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