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Doliente, Jonica Ella,Kim, Yunjung,Nam, Haewook,Choi, Younggyun American Society of Civil Engineers 2017 Journal of environmental engineering Vol.143 No.12
<P>Mill scale, an iron waste, was used to synthesize magnetite particles for the adsorption of phosphate from an aqueous solution. Several techniques were used to characterize the adsorbents. Mill scale-derived magnetite particles exhibited a strong uptake affinity to phosphate in a wide pH range of 3-7, with the maximum adsorptive removal of 100% at an adsorbent concentration of 1 g/L and pH 3-5. The Langmuir isotherm model well described the equilibrium data, exhibiting maximum adsorption capacities for phosphate up to 4.95 and 8.79 mg/g at 298 and 308 K, respectively. Kinetic data correlated well with the pseudo-second-order kinetic model, indicating that chemisorption is involved in the adsorption process. The phosphate adsorption was highly pH-dependent, and the presence of Cl-, SO42-, and CO32- ions had no effect on phosphate removal. X-ray photoelectron spectroscopy (XPS) results revealed that phosphate was bonded onto the surface of magnetite predominantly through bidentate complexation. Desorption was performed on mill scale-derived magnetite to check recyclability. Five successive adsorption/regeneration cycles were successfully applied with a slight decrease in the adsorbent adsorption capacity. (C) 2017 American Society of Civil Engineers.</P>
인 흡착용 마그네타이트 합성 시 알칼리 종류 및 농도가 공침 입자크기에 미치는 영향
이민형,Jonica Ella Doliente,남해욱,김윤중,최영균 대한상하수도학회 2016 상하수도학회지 Vol.30 No.4
Magnetite particles were synthesized by co-precipitation of water-soluble 밀 스케일-derived precursor by various concentrations of (0.5, 0.67, 1, 2 N) NaOH and (0.6, 0.8, 1.2, 2.4 N) NH4OH. It is theoretically known that as the concentration of the alkaline additive used in iron oxide synthesis increases, the particle size distribution of that iron oxide decreases. This trend was observed in both kind of alkaline additive used, NaOH and NH4OH. In addition, the magnetite synthesized in NaOH showed a relatively smaller particle size distribution than magnetite synthesized in NH4OH. Crystalline phase of the synthesized magnetite were determined by X-ray diffraction spectroscopy(XRD). The particles were then used as an adsorbent for phosphate(P) removal. Phosphorus adsorption was found to be more efficient in NaOH-based synthesized magnetite than the NH4OH-based magnetite.