摘要
采用壳聚糖材料为吸附剂,通过水热氧化-溶胶凝胶方法制备了纳米级Fe3O4@SiO2@CTS颗粒(MCNPs)。这种新型吸附剂对Cd2+和Cu2+的吸附在2 min内就可完成,其饱和吸附容量分别为110.0、89.1 mg/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、79.8 mg/g;经60℃水浴处理0.5 h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(13.3 Am2/kg)和很小的矫顽力(1.4 mT),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。
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.
出处
《水处理技术》
CAS
CSCD
北大核心
2014年第5期46-51,共6页
Technology of Water Treatment
基金
国家自然基金委面上项目(51278295)
关键词
核壳结构
壳聚糖
重金属修复
可回收吸附剂
core-shell structure
chitosan
remediation＇ofheavy metal
recyclable adsorbent
