Fe3O4-chitosan magnetic microspheres were prepared by modifying carboxyl Fe3O4 nanoparticle with chitosan. The resulted samples were characterized by X-ray diffraction, scanning electron microscope and thermogravimetry. The adsorption amounts of Cu2+ were detected with an atomic absorption spectrosco-py. In addition, the effect of parameters such as contact time,pH and Cu2+ initial concentration on the adsorption capacities was also discussed. The results have showed that Fe3O4-chitosan magnetic micro-spheres have a narrow size distribution with a mean diameter of 110 nm. Fe3O4-chitosan magnetic micro-spheres are able to adsorb Cu2+ ,and the maximum absorption quantity can reach 21. 3 mg/g. With the increase of adsorbent dosage and temperature, the unit adsorption capacity decreased and the adsorption was better at room temperature. The adsorption of the magnetic microspheres is greatly influenced by the factors of initial concentration of Cu2+ and pH value,and the adsorption capacity was higher at 120 mg/L, and 5. 0 ＜ pH ＜7. 0. The adsorption capacity increased with increasing contact time and the equilibrium was es- tablished within 8 h.%用壳聚糖包覆羧基化Fe3O4磁性纳米粒子制备了Fe3O4-壳聚糖磁性微球,分别用X-射线衍射、扫描电镜、热重分析等方法和手段对所制备的样品进行了结构表征.利用原子吸收光谱,探讨了时间、pH值、Cu2+浓度等对Fe3O4 -壳聚糖磁性微球吸附溶液中Cu2+量的影响.结果表明:Fe3O4 -壳聚糖磁性微球粒径分布较均匀,平均粒径约为110 nm;Fe3O4 -壳聚糖磁性微球能够吸附Cu2+,最大吸附量可达21.3 mg/g.随着吸附剂用量的增加、温度的升高,单位吸附量减小,室温下吸附较佳;Cu2+初始浓度、pH对吸附的影响很大,Cu2+初始浓度在120 mg/L,5.0＜pH＜7.0时吸附较好;随着吸附时间的增加,单位吸附量也增加,8h时基本达到吸附平衡.
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