Ag^+高效吸附剂Fe_3O_4/PANI,PPY的制备及吸附性能研究

The preparation of Fe_3O_4/ PANI、PPY adsorbent and their Ag+ion removal properties

首先在Fe3O4纳米粒表面,以吡咯、苯胺单体为原料,以硝酸(HNO3)为酸性掺杂剂,过硫酸铵[(NH4)2S2O8,APS]为氧化剂,分别采用原位化学氧化聚合法合成了Fe3O4/PANI、PPY复合纳米材料吸附剂。其次研究了以上两种复合纳米材料Fe3O4/PANI、PPY对重金属离子Ag+的吸附性能以及吸附率与pH值的关系,发现以上两种吸附剂对Ag+具有高的吸附性,吸附率达到99.9%,且随着pH值的升高吸附率增大。最后采用SEM、FT-IR及EDX表征的方法,研究了吸附前后吸附剂的变化及吸附机理,表明吸附前后高分子结构没有发生变化,其中N原子是其吸附活性中心。以上两种磁性Fe3O4/PPY和Fe3O4/PANI二种复合纳米粒吸附剂,对于严重影响到水体生物存活的污水中银离子的除去和回收提供了一种简便、高效的分离回收方法。

The Fe3O4/ PANI、PPY nanocomposite adsorbents were prepared via in situ polymerization by aniline and pyrrole monomer respectly,and their structures were characterized by SEM、FT-IR and EDX. The two adsorbents were used for removal of Ag+from the silver nitrate solution,and the removal results showed that Ag+removal rates were more than 99% and increased with an increase in pH. The adsorption process showed that there were no influence on the backbone ring structure of adsorbents,and the adsorption activity center was the N atom. The two magnetic nanocomposite adsorbents were provided a simple and efficient method for separation and recovery of Ag+from waste water.