Fe_3O_4/丙烯酸系磁性微球的制备及对Hg^(2+)、Cu^(2+)、Ni^(2+)的吸附

Fe_3O_4/Acrylate-based Magnetic Microparticles:Preparation and Adsorption Performance Toward Hg^(2+),Cu^(2+) and Ni^(2+)

以二乙烯苯为交联剂,采用悬浮聚合法制备了Fe3O4/丙烯酸系磁性吸附剂。聚合条件为:n(丙烯酸甲酯)∶n(二乙烯苯)=17∶1、w(引发剂)=1%、反应温度75~80℃、反应时间6 h。采用X射线衍射(XRD)、红外(IR)、热重分析(TGA)等对其进行了表征,并考察了它对金属离子的吸附性能。结果表明,制备的磁性吸附剂粒径35~55μm,w(Fe3O4)≈18%。吸附容量随pH升高而增加。饱和吸附容量qm(mmol/g)为:Hg2+2.3,Cu2+2.2,N i2+1.1。采用Lagergrent方程计算的吸附速率常数kad(m in-1)分别为:Hg2+0.023,Cu2+0.034,N i2+0.036。吸附剂可用c(H2SO4)=1 mol/L或c(HNO3)=0.5 mol/L再生。

A novel Fe3O4/aerylate-based magnetic adsorbent were prepared by suspension polymerization using divinybenzene as a crosslinker. The parameters for polymerization were n （ methyl acrylate） ：n （divinybenzene） = 17：1, w （initiator） = 1%, reaction temperature 75 - 80℃ and reaction time 6 h. This adsorbent was characterized by XRD, IR, TGA etc. Moreover, the adsorption performance of the adsorbent towards metal ions was investigated. The results showed that the diameter of the magnetic adsorbent was 35 - 55 μm and the content of Fe3O4 was 18%. The adsorption capacity increased with increasing pH. The maximum adsorption capacity （ qm ） was 2.3 mmol/g for Hg^2＋ , 2. 2 mmol/g for Cu^2＋ and 1.1 mmol/g for Ni^2＋. The adsorption rate constant calculated by Lagergrent equation was 0. 023 min^-1 for Hg^2＋ ,0. 034 min^-1 for Cu^2＋ and 0. 036 min^-1 for Ni^2＋. Regeneration of the adsorbent was achieved using 1 mol/L H2SO4 or 0. 5 mol/L HNO3.