Abstract
在以共沉淀法制备的磁性纳米Fe 3 O 4 粒子(Magnetic nanoparticles, MNP)表面进行了化学修饰, 制备了一种新型富含羧基功能团的核壳磁性纳米吸附剂(Carboxylic functionalized Fe 3 O 4 magnetic nanoparticles, CMNP). 利用透射电子显微镜(TEM)、 X射线衍射仪(XRD)、 X射线能量色散谱(EDS)、 振动样品磁强计(VSM)、 傅里叶变换红外光谱(FIIR)和热重分析仪(TGA)对CMNP的形貌、 结构、 化学组成和磁性能进行了表征, 并考察了吸附剂对Cu 2+ 的吸附性能, 研究了溶液pH值、 吸附时间和Cu 2+ 初始浓度对吸附性能的影响. 结果表明, 羧基化核壳磁性纳米Fe 3 O 4 颗粒的平均粒径为15 nm, 具有良好的超顺磁性, 饱和磁化强度为41.84 A·m 2 /kg, 在10 min中内可达到吸附平衡, 在pH=7.0时吸附量最高, 吸附等温数据符合Langmuir模型, 饱和吸附量 q m = 43.48 mg/g.
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