四氧化三铁/植酸钠对水中六价铬的分离  

Removal of Cr(VI) in water by Fe_3O_4/IP_6

作　　者：陈璐[1] 傅书悦 凌波[1] 蒋霞燕 张雪茹[1] 王爽 杨海峰[1] 

机构地区：[1]上海师范大学生命与环境科学学院,上海200234

出　　处：《上海师范大学学报（自然科学版）》2014年第6期629-634,共6页Journal of Shanghai Normal University(Natural Sciences)

基　　金：上海师范大学大学生创新实验项目(B-9117-13-007061);国家自然科学面上基金项目(21073121)

摘　　要：四氧化三铁(Fe3O4)这一用途广泛的功能性磁性纳米粒子,但是由于在制备过程中,其形貌难以控制,团聚严重,大大限制了它的应用.用环境友好的植酸钠(IP6)胶束为模板,利用分子中六个不共面的磷酸酯键,络合铁离子,水解制备了Fe3O4/IP6纳米结构,其有分散性好,长期稳定的特点.Fe3O4/IP6中磷酸酯键可捕获富集水体中Cr(VI)离子,利用Fe3O4的磁性,通过外磁场将Cr(VI)离子从废水中分离出来.实验结果表明:该过程时间短(10 min),效果理想.还观察了水体p H值变化对Fe3O4/IP6纳米粒子分离Cr(VI)的影响.The preparation of functional ferroferric oxide （ Fe3O4 ） magnetic nanoparticles is widely concerned. However, during their preparation, it is difficult to control the morphology of Fe3O4 nanoparticles and also a serious agglomeration exists, greatly re- stricting their applications. In present paper,an economical and ＇green＇ reagent-phytic acid （IP6） can form micelle in the water and then the nanoparticles can grow in a soft template. The as-prepared Fe3 O4/IP6 exhibited a good stability and high dispersion. Fe3O4/IP6 can chelate with Cr （VI） due to its phosphate structure. The Fe3O4/IP6 chelated with Cr （VI） can be removed con- veniently from water using an external magnet. Fe3O4/IP6 nanocomposites have a good adsorption capacity to Cr （VI） within a short time （10 min）. Additionally, the effect of pH on adsorption efficiency was studied.

关 键 词：四氧化三铁 植酸 六价铬 

分 类 号：O652.6[理学—分析化学]