摘要
以钝顶螺旋藻和磁性纳米粒子四氧化三铁为材料,采用海藻酸钙进行包埋制备出钝顶螺旋藻磁性生物吸附剂,从pH、温度、吸附动力学等方面研究钝顶螺旋藻磁性生物吸附剂对Cr(Ⅵ)的吸附性能。研究结果表明:当pH为1.5,温度为40℃时,吸附效果最好,时间在120 min时吸附容量达到饱和吸附量的96.5%;随Cr(Ⅵ)离子初始浓度的增加,吸附量增加,吸附效率减小。且与海藻酸钙吸附行为显著不同,说明主要是由钝顶螺旋藻对Cr(Ⅵ)离子吸附作用;钝顶螺旋藻磁性生物吸附剂对Cr(Ⅵ)的吸附过程可用Langmuir和Freundlich等温模型进行描述;同时,磁性生物吸附剂具有较强的磁性,在加有外界磁场的情况下,能快速地实现固液分离和回收,可简化重金属离子吸附的后续处理。
The magnetic biosorbents of Spirulina platensis were prepared via enwrapping of magnetic Fe3O4 nanoparticles and Spirulina platensis by alginate.The biosorption of Cr（Ⅵ） on the magnetic biosorbents of Spirulina platensis was investigated in different cases including the influence of pH,temperature and the absorption kinetics as well as biosorption equation.The results indicate that the optimum absorptive condition for Cr（Ⅵ） is as follows： pH of 1.5,the adsorption temperature of 40 ℃,and the adsorptive capacity is 96.5% of the saturated adsorptive capacity after the adsorptive time of 120 min.With the increase of the initial concentration of Cr（Ⅵ）,the absorptive capacity of the magnetic biosorbents of Spirulina platensis increases,while absorptive efficiency of magnetic biosorbents of Spirulina platensis decreases.The absorption properties of magnetic biosorbents of Spirulina platensis are very different from that of alginate,indicating that the adsorption of the magnetic biosorbents is basically due to the adsorption of the Spirulina platensis cells.Biosorption properties of magnetic biosorbents of Spirulina platensis on Cr（Ⅵ） can be described well by Langmuir and Freundlich isotherm equations.Furthermore,the magnetic biosorbents can be very facilely recycled under the influence of the external magnetic field,thus simplifying the further processing of adsorption of heavy metal ion.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第9期2551-2557,共7页
Journal of Central South University:Science and Technology
基金
国家科技支撑计划项目(2007BAC231B01)
南昌大学校基金资助项目(Z04288)
