共存离子对新型絮凝剂MCC除镉性能的影响  

Effect of Coexist Ions on the Performance of Removing Cadmium of New Flocculant MCC

作　　者：张翠玲[1] 张明月[1] 常青[1] 杨至慧[1] 王立[1] 

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《兰州交通大学学报》2012年第3期95-98,共4页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(31060060)

摘　　要：为进一步拓展天然高分子絮凝剂壳聚糖(CTS)的应用范围,以CTS、L-半胱氨酸(L-cys)等为原料,以含镉废水为处理对象,通过正交试验研究了巯基改性壳聚糖(MCC)的最佳制备条件,并研究了水体中常见的Mg2+、Fe3+、Al 3+、F-等4种共存离子对MCC除镉性能的影响.结果表明:在最佳制备条件下得到的MCC对废水中的镉有较好去除效果;Mg2+的存在对絮凝剂除镉有抑制作用;低浓度的Fe3+和Al 3+对絮凝剂除镉有抑制作用,但浓度较高时起促进作用;F-在一定程度上能抑制镉的去除.In order to extend the application range of natural polymer flocculant chitosan （CTS）, an optimum preparation conditions of a new type of flocculant -modified chitosan by L-cysteine （MCC） can be obtained to deal with waste water containing cadmium by an orthogonal experiment. And several coexisting ions which affect the removal rate of Cd^2＋ are also studied. It is shown that the removal rate of cadmium in waste water is well; presence of Mg^2＋ inhibits the flocculant addition to cadmium; lower concentration of Fe^3＋ and Al^3＋ inhibits the flocculation of Cd^2＋, but it can promote the removal rate of Cd^2＋ when concentration increases;and F- can inhibit the removal rate of Cd^3＋ to some extent.

关 键 词：絮凝剂 壳聚糖 L-半胱氨酸 镉 

分 类 号：X703[环境科学与工程—环境工程]