作　　者： ; ;

机构地区： 兰州交通大学环境与市政工程学院

出　　处： 《环境科学学报》 2007年第5期763-769,共7页

摘　　要： 以聚乙烯亚胺、NaOH、CS2为原料,在一定条件下合成了一种新型两性高分子重金属絮凝剂——聚乙烯亚胺基黄原酸钠(PEX),研究了其捕集Ni2+及除浊性能,并对几个影响因素作了考察.实验结果表明:(1)该絮凝剂对Ni2+有很好的捕集功能,Ni2+的最高去除率可达99%以上;(2)pH值对PEX投加量有一定的影响,但对Ni2+的最高去除率影响不大;(3)水中存在碱金属或碱土金属离子时在一定程度上会促进Ni2+的去除;(4)当有Fe3+存在时,在较低pH值下会明显降低Ni2+的去除,但当pH值升高时对Ni2+的去除有促进作用;(5)Cl-与NO3-的存在可促进PEX对Ni2+的去除,而SO42-的存在对Ni2+的去除有抑制作用,需增加投药量才能得到较好的去除;(6)Ni2+和致浊物质共存时,会互相影响彼此的去除. A novel water-soluble amphotefic macromolecule heavy metal flocculant polyethyleneimine-sodium xanthogente （PEX） has been synthesized by reacting polyethyleneimine with CS2 in alkaline medium. In jar tests, the flocculation performance of PEX was evaluated by using wastewater which contains Ni^2 ＋ or/and turbidity. Some factors which affect the removal of Ni^2 ＋ and turbidity were also studied. The experimental results showed that ： （ 1 ） PEX had strong binding capabilities with Ni^2 ＋ . The highest removal rate of Ni^2 ＋ reached above 99%. （2） The pH value had some effect on the dosage of PEX, but little effect on the highest removal rate of Ni^2 ＋ . （3） The existence of alkali metal or alkaline-earth metal ions in wastewater could promote the removal of Ni^2 ＋ to some extent. （4） When there were Fe^3 ＋ ions in wastewater, the removal rate of Ni2 ＋ would decrease evidently at lower pH value, and the existence of Fe^3 ＋ ions would promote the removal of Ni^2 ＋ with pH value increasing. （5） The existence of Cl^- or NO3^- ions in wastewater could promote the removal of Ni2^ ＋ , but SO4^2- ions would depress the removal of Ni2^ ＋ . （6） Ni2^ ＋ and turbidity-causing substance effected the removal of each other in the co-existing system of heavy metal ions and turbidity.

关 键 词： 高分子重金属絮凝剂 两性聚电解质 等电点 含镍废水 螯合沉淀

领　　域： [环境科学与工程]