纳米Fe@SiO<sub>2</sub>一步合成及其对Cr(VI)的去除

引用本文: 李勇超, 李铁龙, 王学, 金朝晖. 纳米Fe@SiO₂一步合成及其对Cr(VI)的去除[J]. 物理化学学报, 2011, 27(11): 2711-2718. doi: 10.3866/PKU.WHXB20111134 shu

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

纳米Fe@SiO₂一步合成及其对Cr(VI)的去除

基金项目:
国家自然科学基金(40971254, 20907023, 41173102) (40971254, 20907023, 41173102)

摘要: 利用液相还原与改进的Stöbr 法相结合, 在不使用表面改性剂和氨水的条件下, 通过向原硅酸乙酯(TEOS)和氯化铁混合溶液直接添加硼氢化钾, 一步合成了二氧化硅包覆的纳米铁复合材料(Fe@SiO₂). 通过X射线粉末衍射(XRD)仪、能量色散X射线仪(EDAX)、透射电子显微镜(TEM)、紫外-可见(UV-Vis)吸收分光光度计、傅里叶红外(FTIR)光谱仪、X射线光电子能谱仪(XPS)等对所得样品的形貌、结构和组成进行表征. 将制备的Fe@SiO₂用于水体中Cr(VI)还原去除并考察了TEOS添加量对其去除能力的影响. 结果表明Fe@SiO₂具有清晰的核壳结构, 多孔的SiO₂层包裹1-2 个球形纳米铁粒子. 纳米铁粒径主要分布在20-30 nm之间, 随着TEOS投加量的增加, SiO₂层变厚, 纳米铁核具有更好的分散性. 与未包覆型纳米铁相比, Fe@SiO₂对Cr(VI)的去除能力显著提高. TEOS投加量为0.1 mL所制备的Fe@SiO₂对Cr(VI)去除能力(以Fe 的质量计算)达到最大, 为466.67 mg·g^-1, 而未包覆型纳米铁仅为76.35 mg·g^-1.

关键词:

English

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: 27 October 2011
Fund Project:
国家自然科学基金(40971254, 20907023, 41173102)

Abstract: 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.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

纳米Fe@SiO₂一步合成及其对Cr(VI)的去除

English

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

中国化学会秘书处

纳米Fe@SiO2一步合成及其对Cr(VI)的去除

English

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

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

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