改性玉米淀粉对重金属捕集性能的研究

Research on chelating properties of modified corn starch for heavy metals

研究了二硫代氨基甲酸改性玉米淀粉(DTCS)对单一重金属溶液中重金属离子的捕集作用,考察了影响其捕集作用的因素,包括重金属种类、pH、温度、混凝时间、无机离子的干扰等,确定了合适的应用条件。结果表明,在单一重金属离子浓度为1.0×10-3 mol/L的溶液中,DTCS对重金属离子捕集的选择性:Cu2+>Pb2+>Cd2+>Zn2+>Ni2+,去除率分别为99.91%、99.88%、87.36%、85.17%、66.36%,且K+、Ca2+等无机离子对其去除效果影响不大。

The chelating properties for heavy metals of modified corn starch which contains dithiocarbamate group （DTCS） have been studied. The effect of heavy metal,pH,temperature,time,inorganic ions on DTCS＇s chelating properties has tested. Experimental results show that the ability of DTCS＇s removing heavy metals is： Cu^2＋ 〉Pb^2＋〉Cd^2＋〉 Zn^2＋〉 Ni^2＋. The removal rate of them are 99.91%, 99.88%, 87.36%, 85.17%, 66.36% respectively, and the inorganic ions, such as K^＋, Ca^2＋ have little effect on removal efficiency.