中文摘要：

采用壳聚糖材料为吸附剂，通过水热氧化一溶胶凝胶方法制备了纳米级Fe2O4@SiO2@CTS颗粒（MCNPs）。这种新型吸附剂对Cd^2＋和Cu^2＋的吸附在2min内就可完成，其饱和吸附容量分别为110．0、89．1mg／g，且能够通过酸洗脱附，脱附率分别达到92．7％和94．6％；3次回用后吸附容量仍能达到92．2、79．8mg／g；经60℃水浴处理0．5h后吸附率仅分别下降1．9％和1．4％；而且该吸附剂具有较大的饱和磁化强度（13．3Am^2/kg）和很小的矫顽力（1．4mT），可通过磁性快速回收，并在水中分散性良好。可见，MCNP是一种可回收再利用、可满足重金属应急污染处理要求的吸附剂。

英文摘要：

Choosing chitosan as an adsorbent, the nanosized Fe2O4@SiO2@CTS （magnet chitosan nanoparticles, MCNPs for short） is synthesized through hydrothermal oxidation and sol-gel methods. This new adsorbent can adsorb Cd2＋ and Cu2＋ extremely rapidly （within 2 min）, saturated adsorption capacity of which are above 110.0 and 89.1mg/g respectively. Besides, the adsorbed MCNPs can easily regenerate by simple acid pickling, the stripping rate of which are 92.7% and 94.6%. Then the adsorption capacity is still 92.2 and 79.8 mg/g after three times of regeneration, which stands for fine recycling stability. The MCNPs is also stable which adsorption capacity just decrease 1.9% and 1.4% after a bath of 60 ℃ in 0.5 h. Furthermore, with a saturation magnetization of 13.3 AmVkg and a coercivity of only 1.4 mT, this new material can be rapidly recycled by magnets, and is good dispersion in water. On the basis above, MCNPs is a recyclable and renewable material for heavy metal pollution emergency treatment in natural water.