Department of Chemical Engineering National Taiwan University of Science and Technology, 43 Keelung Rd Sec. 4, Taipei 106, Taiwan.
J Hazard Mater. 2010 Nov 15;183(1-3):853-8. doi: 10.1016/j.jhazmat.2010.07.105. Epub 2010 Aug 3.
Magnetic carbonaceous nanoparticles were prepared by a facile two-step solution phase thermal synthesis. Magnetic nanoparticles (MNPs) with size less than 100 nm were first generated from FeCl(3) in a solvothermal reaction. The size could be significantly reduced to approximately 30 nm when 1,6-hexanediamine was employed in the reaction solution to functionalize the surface of MNPs with amine. Both the plain and amine-functionalized MNPs (MH) were effectively encapsulated in the carbonaceous shell by hydrothermal treatment in 0.5 M glucose solution. The saturation magnetization of MH decreased significantly from 70 to 25 emu/g after carbonaceous shell was formed. The as-prepared magnetic carbonaceous nanoparticles (MH@C) carries a negative surface charge (-30 mV) at neutral pH and has a point of zero charge (PZC) at pH 2. The carbonaceous shell not only can protect the magnetic nanoparticles (MNP) from the corrosive environment but also possesses a high adsorption capacity towards Pb(II). The adsorption isotherm at room temperature can be well-fitted by Langmuir model with a maximum adsorption capacity of 123 mg/g.
磁性碳纳米粒子通过简便的两步溶液热合成法制备。首先，在溶剂热反应中，FeCl3 生成小于 100nm 的磁性纳米颗粒（MNPs）。当反应溶液中使用 1,6-己二胺时，MNPs 的表面可以用胺官能化，其尺寸可以显著减小至约 30nm。在 0.5M 葡萄糖溶液中进行水热处理后，碳壳可以有效地将原始和胺功能化的 MNPs（MH）封装在碳壳中。在形成碳壳后，MH 的饱和磁化强度从 70 降至 25 emu/g。在中性 pH 值下，所制备的磁性碳纳米粒子（MH@C）具有负表面电荷（-30 mV），在 pH 值为 2 时具有零电荷点（PZC）。碳壳不仅可以保护磁性纳米颗粒（MNP）免受腐蚀性环境的影响，而且对 Pb（II）具有高吸附能力。在室温下的吸附等温线可以很好地用朗缪尔模型拟合，最大吸附容量为 123mg/g。
