Superparamagnetic high-surface-area Fe₃O₄ nanoparticles as adsorbents for arsenic removal

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• 作者：Liyun Feng^a ; ^b ; Minhua Cao^a ; ^{caomh@bit.edu.cn} ; Xiaoyu Ma^a ; Yongshuang Zhu^a ; Changwen Hu^a ;
• 关键词：Fe3O4 ; Superparamagnetic ; Nanoparticles ; Adsorbents ; Arsenic removal
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 May, 2012
• 卷：217-218
• 期：Complete
• 页码：439-446
• 文件大小：1580 K

摘要

Superparamagnetic ascorbic acid-coated Fe₃O₄ nanoparticles with a high specific surface area were successfully synthesized via an environmentally friendly hydrothermal route in the absence of any templates. The as-synthesized ascorbic acid-coated Fe₃O₄ nanoparticles have a diameter of less than 10 nm, thus leading to a high specific surface area of about 179 m²/g, which is even larger than those of well-defined mesoporous structures. The only used capped agent is ascorbic acid, which serves as a functionalized molecule to make sure the high dispersibility and stability of the ascorbic acid-coated Fe₃O₄ nanoparticles in aqueous solution. The ascorbic acid-coated Fe₃O₄ nanoparticles exhibit superparamagnetic properties at room temperature and saturation magnetization approaches 40 emu g^鈭?. The ascorbic acid-coated Fe₃O₄ nanoparticles were evaluated as an absorbent to remove heavy metal arsenic from wastewater. The adsorption data obeyed the Langmuir equation with a maximum adsorption capacity of 16.56 mg/g for arsenic (V), and 46.06 mg/g for arsenic (III).