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采用悬浮聚合法经共聚、开环反应,得到了3种具有核-壳结构、以乙二胺为官能团的氨基功能化纳米Fe3O4磁性高分子材料(EDA-NMPs).考察了其作为吸附剂对废水中Cr(Ⅵ)的吸附性能,优化了最佳吸附实验条件,并着重研究了高分子聚合过程中交联剂二乙烯基苯(DVB)的用量对所得EDA-NMPs材料吸附性能的影响.结果表明,材料合成过程中DVB的用量对EDA-NMPs的吸附性能有显著影响.在最佳吸附条件(pH2.5,T=35℃)下,共聚过程中不添加交联剂二乙烯基苯(DVB)时得到的材料对Cr(Ⅵ)的饱和吸附量(qm)最大,可达135.14mg.g-1,初始吸附速率为1111.1mg.g-1.min-1,以3种吸附剂处理浓度为50mg·L-1的含Cr(Ⅵ)废水时,去除率均超过99%,Cr(Ⅵ)的剩余浓度低于0.31mg·L-1,达到国家排放标准(≤0.5mg·L-1).
Three kinds of amino-functionalized Fe3O4 magnetic polymer materials (EDA-NMPs) with core-shell structure and ethylenediamine functional groups were obtained by copolymerization and ring-opening reaction by suspension polymerization. The adsorption of Cr (Ⅵ) in waste water was optimized, and the optimum adsorption conditions were optimized. The effects of the dosage of divinylbenzene (DVB) on the adsorption properties of EDA-NMPs were also investigated. The results showed that the amount of DVB during the synthesis of the materials had a significant effect on the adsorption of EDA-NMPs.Under the optimal adsorption conditions (pH2.5, T = 35 ℃), no cross-linking agent, divinylbenzene (DVB), the maximum adsorption capacity (qm) of Cr (Ⅵ) reached 135.14mg.g-1 and the initial adsorption rate was 1111.1mg.g-1min-1. When the concentration of Cr (Ⅵ) was 50mg · L-1, the removal rates were over 99% and the residual Cr (Ⅵ) concentration was below 0.31mg · L-1, reaching the national discharge standard (≤0.5mg · L -1).