Key Laboratory of Cluster Science, Ministry of Education of China, Department of Chemistry, Beijing Institute of Technology, Beijing, PR China.
J Hazard Mater. 2012 May 30;217-218:439-46. doi: 10.1016/j.jhazmat.2012.03.073. Epub 2012 Apr 3.
Superparamagnetic ascorbic acid-coated Fe(3)O(4) 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 Fe(3)O(4) nanoparticles have a diameter of less than 10 nm, thus leading to a high specific surface area of about 179 m(2)/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 Fe(3)O(4) nanoparticles in aqueous solution. The ascorbic acid-coated Fe(3)O(4) nanoparticles exhibit superparamagnetic properties at room temperature and saturation magnetization approaches 40 emu g(-1). The ascorbic acid-coated Fe(3)O(4) 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).
具有高比表面积的超顺磁抗坏血酸包覆的 Fe(3)O(4)纳米粒子通过在没有任何模板的情况下的环保水热路线成功合成。所合成的抗坏血酸包覆的 Fe(3)O(4)纳米粒子的直径小于 10nm，从而导致约 179m(2)/g 的高比表面积，甚至大于那些具有明确定义的介孔结构的比表面积。唯一使用的封端剂是抗坏血酸，它作为功能化分子，以确保抗坏血酸包覆的 Fe(3)O(4)纳米粒子在水溶液中的高分散性和稳定性。抗坏血酸包覆的 Fe(3)O(4)纳米粒子在室温下表现出超顺磁性，饱和磁化强度接近 40 emu g(-1)。抗坏血酸包覆的 Fe(3)O(4)纳米粒子被评估为一种从废水中去除重金属砷的吸附剂。吸附数据符合 Langmuir 方程，对于砷（V）的最大吸附容量为 16.56mg/g，对于砷（III）的最大吸附容量为 46.06mg/g。
