Adsorption behavior and adsorption mechanism of Cu(Ⅱ) ions on amino-functionalized magnetic nanoparticles  

铜离子在氨基化磁性纳米粒子上的吸附行为及吸附机理(英文)

作　　者：李卉[1] 肖得力[1] 何华[1,2] 林锐[3] 左朋礼[1] 

机构地区：[1]中国药科大学 分析化学教研室,南京210009 [2]中国药科大学 理学院 药物质量与安全预警教育部重点实验室,南京210009 [3]盐城卫生职业技术学院,盐城224005

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第9期2657-2665,共9页中国有色金属学报（英文版）

基　　金：Project(CXZZ11-0812)supported by Graduate Students Innovative Projects of Jiangsu Province,China;Project(J20122288)supported by Guizhou Provincial Natural Science Foundation of China;Project(Y4110235)supported by Zhejiang Provincial Natural Science Foundation of China;Project(JKY2011008)supported by Fundamental Research Funds for the Central Universities,China

摘　　要：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.通过溶胶凝胶法制备氨基修饰的磁性纳米粒子。以紫外分光光度法为检测手段,采用静态批次实验研究不同实验参数(吸附时间、溶液pH和溶液温度)对铜离子吸附的影响。对铜离子的动力吸附学过程符合准二级动力学模型。准一级动力学模型证明其对铜离子的吸附是一个基于内部粒子扩散的过程。吸附等温线数据既符合Langmuir吸附等温模型又符合Dubinin Radushkevich吸附等温式。随着溶液pH的增加和温度的升高,水中铜离子的去除效率也增加。另外,铜离子在低pH时可以很容易地从吸附材料上面洗脱下来,并且在材料重复使用5次之后,铜离子的回收率仍然保持在90.0%以上。根据吸附活化能和热力学实验结果,可以推断铜离子在吸附剂上的吸附机制是离子交换表面络合。

关 键 词：amino-functionalized magnetic nanoparticles Cu（Ⅱ） ions ADSORPTION ion exchange-surface complexation 

分 类 号：O647.3[理学—物理化学]