Citation: LI Yong-Chao, LI Tie-Long, WANG Xue, JIN Zhao-Hui. One-Step Synthesis of Fe@SiO₂ and Its Application in Cr(VI) Removal[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2711-2718. doi: 10.3866/PKU.WHXB20111134 shu

One-Step Synthesis of Fe@SiO₂ and Its Application in Cr(VI) Removal

1.
College of Environmental Science and Engineering, Nankai University, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin 300071, P. R. China

Received Date: 17 June 2011
Available Online: 21 September 2011
Fund Project: 国家自然科学基金(40971254, 20907023, 41173102) (40971254, 20907023, 41173102)

Without using aqueous ammonia and a surface modifier, a facile one-step method was developed to fabricate Fe nanoparticles coated with a SiO₂ shell (Fe@SiO₂) by a modified Stöber method combined with an aqueous reduction method. The Fe@SiO₂ was prepared by directly adding potassium borohydride to a mixed solution of tetraethylorthosilicate (TEOS) and anhydrous ferric chloride. The structure and morphology of the as-synthesized powders were investigated by X-ray powder diffraction (XRD), energy dispersion analysis of X-ray (EDAX), transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) absorption spectroscopy, Fourier-transform infrared (FTIR) spectrometry and X-ray photoelectron spectroscopy (XPS). The feasibility of using the prepared Fe@SiO₂ for the reductive immobilization of Cr(VI) in water was studied. The influence of TEOS addition on Cr(VI) removal by Fe@SiO₂ was investigated. The results showed that the prepared Fe@SiO₂ had a distinct core-shell structure. One or two Fe nanoparticles (20-30 nm in diameter) were homogeneously coated by a porous SiO₂ shell. With an increase in the amount of added TEOS the Fe nanoparticles had better dispersion and the thickness of the SiO₂ coating increased gradually. Compared with uncoated Fe nanoparticles, Cr(VI) removal by Fe@SiO₂ increased greatly. At a TEOS dosage of 0.1 mL the removal ability of the prepared Fe@SiO₂ was the highest. The highest removal ability of Fe@SiO₂ was 466.67 mg·g^-1 and it was only 76.35 mg·g^-1 for uncoated Fe nanoparticles.
- SiO₂ shell,
- Fe nanoparticles,
- One-step synthesis,
- Hexavalent chromium,
- Reduction
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沈阳化工大学材料科学与工程学院沈阳 110142

One-Step Synthesis of Fe@SiO2 and Its Application in Cr(VI) Removal

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通讯作者: 陈斌, bchen63@163.com

One-Step Synthesis of Fe@SiO₂ and Its Application in Cr(VI) Removal