Adsorption of Pb~（2＋） on amino-functionalized magnetic nanoparticles Fe_3O_4 | 氨基化磁纳米Fe3O4对铅离子的吸附研究

Chinese. 采用水热法制备了一种氨基化磁纳米Fe3O4粒子,并采用X-射线衍射、透射电镜和红外光谱对该材料进行了表征。研究了氨基化磁纳米Fe3O4在不同pH、反应时间、添加量和初始金属离子浓度下对Pb2＋的吸附能力。结果表明：在pH 8.5、分析时间为10 min时对Pb2＋的吸附率可达90%以上;随着氨基化磁纳米Fe3O4添加量的增加,其对Pb2＋的吸附能力也增强;随着Pb2＋初始浓度的增加,氨基化磁纳米Fe3O4对Pb2＋的吸附率降低。氨基化磁纳米Fe3O4对Pb2＋的吸附动力学和热力学分别符合准二级吸附模型和Langmuir等温吸附模型。不同浓度盐酸对保留在氨基化磁纳米Fe3O4上的Pb2＋的脱附影响研究结果显示：0.1～2.0 mol.L-1盐酸对氨基化磁纳米Fe3O4材料的脱附率均可达到85%以上,说明该材料具有循环利用的可能。

English. A novel amino-functionalized magnetic nanoparticle Fe3O4（NH2-MNPs） was prepared through hydro-thermal method and characterized by powder X-ray diffraction,Transmission electron microscopy and Infrared spectrometer.The effects of pH,reaction time,adsorbent dosage and the initial concentration of Pb2＋ on the adsorption rate of Pb2＋ were evaluated in this study.The results showed that the adsorption rate could be 90% when pH was 8.5 and reaction time was 10 min.The adsorption rate of Pb2＋ was found to have increased with the increasing of adsorbent dosage and decreased with the increasing of initial concentration of Pb2＋.The dynamical and the equilibrium isotherm adsorption studies of Pb2＋ on amino-functionalized magnetic nanoparticles Fe3O4 followed pseudo-second-order rate mechanism and the Langmuir isotherm equation.Finally,the effect of different concentration of HCl on the desorption ratio of Pb2＋ was also examined.And the results indicated that desorption rate could be obtained 85% during the evaluated HCl concentration from 0.1 to 2.0 mol・L-1,which illustrated that it is possible to cyclicly utilize amino-functionalized magnetic nanoparticle Fe3O4.