中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 9 September 2013 |
（1. Department of Analytical Chemistry, China Pharmaceutical University, Nanjing 210009, China;
2. Key Laboratory of Drug Quality Control and Pharmacovigilance of Ministry of Education,
China Pharmaceutical University, Nanjing 210009, China;
3. Yancheng Health Vocational and Technical College, Yancheng 224005, China）
Abstract:Amino-functionalized magnetic nanoparticle (NH2-MNP) were prepared by a sol-gel approach. The adsorption behavior of Cu(II) ions on NH2-MNP was discussed systematically by batch experiments. The effects of initial Cu(II) ions concentration, time, pH and temperature were investigated. In kinetic studies, the pseudo-second-order model was successfully employed, and the pseudo-first-order model substantiated that Cu(II) adsorption on NH2-MNP was a diffusion-based process. Langmuir model and Dubinin-Radushkevich model (R2>0.99) were more corresponded with the adsorption isotherm data of Cu(II) ions than Freundlich model. The adsorption capacity was increased with the increment of temperature and pH. NH2-MNP remains excellent Cu(II) recoveries after reusing five adsorption and desorption cycles, making NH2-MNP a promising candidate for repetitively removing heavy metal ions from environmental water samples. According to the results obtained from adsorption activation energy and thermodynamic studies, it can be inferred that the main adsorption mechanism between absorbent and Cu(II) ions is ion exchange–surface complexation.
Key words: amino-functionalized magnetic nanoparticles; Cu(II) ions; adsorption; ion exchange-surface complexation
