Postgraduate Division of Chemistry, Midnapore College, Midnapore, Paschim Medinipur 721101, West Bengal, India.
Int J Biol Macromol. 2013 Nov;62:557-64. doi: 10.1016/j.ijbiomac.2013.09.018. Epub 2013 Sep 27.
Ceric ion induced graft copolymerization of N,N-dimethyl acrylamide (DMA) and acryl amide (AM) were carried out onto the hydroxyethyl starch (HES). These grafted copolymers were used for the removal of metal ions from their aqueous solutions. Flocculation performances of the synthesized graft copolymers were evaluated in 1.0 wt% silica suspensions. A comparative study of the flocculation performances of the synthetic graft copolymers was also made. The different factors affecting metal ion absorption, namely pH, treatment time, temperature and polymer dose were studied. A comparative study of the metal ion removal capacity of the two synthetic graft copolymers was also made in five metal ions namely Ni(II), Zn(II), Cu(II), Pb(II) and Hg(II). The metal ion removal capacity follows the order Hg(II)>Cu(II)>Zn(II)>Ni(II)>Pb(II) in both the two synthetic polymers. Between the two graft copolymers, graft copolymer based on AM shows better performance than that based on DMA in all the metal solutions. But the flocculation performance of DMA based graft copolymer showed better performances than that AM based graft copolymer. The former also performed best when compared to the commercial flocculants in the same suspension.
铈离子引发的 N,N-二甲基丙烯酰胺（DMA）和丙烯酰胺（AM）接枝共聚到羟乙基淀粉（HES）上。这些接枝共聚物被用于从其水溶液中去除金属离子。在 1.0wt%的二氧化硅悬浮液中评价了合成接枝共聚物的絮凝性能。还对合成接枝共聚物的絮凝性能进行了比较研究。研究了影响金属离子吸附的不同因素，即 pH 值、处理时间、温度和聚合物剂量。还对两种合成接枝共聚物在五种金属离子（Ni（II）、Zn（II）、Cu（II）、Pb（II）和 Hg（II））中的金属离子去除能力进行了比较研究。在两种合成聚合物中，金属离子的去除能力顺序为 Hg（II）>Cu（II）>Zn（II）>Ni（II）>Pb（II）。在所有金属溶液中，基于 AM 的接枝共聚物的性能均优于基于 DMA 的接枝共聚物。但是，在相同的悬浮液中，与商业絮凝剂相比，基于 DMA 的接枝共聚物的絮凝性能表现更好。
