丙烯酸甲酯接枝淀粉的制备及其吸附性能研究

Study on preparation and adsorption of methyl acrylate grafted starch

以过硫酸铵为引发剂,玉米淀粉与丙烯酸甲酯为主要原料,采用接枝共聚法制备了丙烯酸甲酯接枝玉米淀粉聚合物,并以此作为废水中重金属Pb2+的吸附剂。研究结果表明:采用正交试验法优选出制备丙烯酸甲酯接枝淀粉聚合物的最佳工艺条件是含水量为15%、反应温度为125~℃、m(单体)∶m(淀粉)=1∶5和反应时间为80 min;当吸附温度为50~℃、p H=7、接枝聚合物的投料量为2.5 g和吸附时间为45 min时,该接枝聚合物对废水中Pb^(2+)的吸附率(为67.9%)相对最大,是一种可有效处理废水中Pb^(2+)的高分子吸附剂。

With ammonium persulfate as initiator, corn starch and methyl acrylate as main raw materials, a methyl acrylate grafted corn starch polymer, which can be used as adsorbent of heavy metal Pb2＋ in wastewater, was prepared by graft copolymerization method. The research results showed that the optimal process conditions of preparing methyl acrylate grafted starch polymer were preferred by orthogonal experiment when water content was 15%, mass ratio of re（monomer） ： re（starch） was 1：5, and reaction temperature and time were 125℃ and 80 min respectively. The adsorption rate （ 67.9% ） of grafted polymer adsorb Pb2＋ in wastewater was relatively maximal, so it is a macromolecule adsorbent, which can effectively adsorb the Pb2＋ in wastewater when adsorption temperature was 50℃, pH value was 7, grafted polymer was 2.5 g and adsorption time was 45 min.