• 关键词：高分子重金属絮凝剂  含铜废水  聚乙烯亚胺  巯基乙酸  络合  絮凝

• 基金项目：国家自然科学基金项目(No20377020)

• 王进喜
• 1. 兰州交通大学环境与市政工程学院 兰州 730070; 2. 甘肃联合大学化工学院 兰州 730000

• 常青
• 兰州交通大学环境与市政工程学院 兰州 730070

• 章敏
• 兰州交通大学环境与市政工程学院 兰州 730070

• 王亚军
• 兰州理工大学土木工程学院 兰州 730050

• 摘要：通过酰胺化反应将重金属络合剂巯基乙酸(TGA)接入高分子絮凝剂聚乙烯亚胺(PEI)的分子链中,合成了新型高分子重金属絮凝剂巯基乙酰聚乙烯亚胺(MAPEI),以达到用同一种絮凝剂既能除重金属又能除浊的目的.实验结果表明:①该絮凝剂对Cu²⁺有很好的捕集功能,Cu²⁺的最高去除率可达95%以上;②pH值对MAPEI除Cu²⁺、去浊的效果有一定的影响但影响不大,pH值低时除浊效果较好,pH值较高时除Cu²⁺效果较好;③当Cu²⁺和致浊物质共存时,会互相促进彼此的去除;④废水中Ca²⁺的存在会促进Cu²⁺的去除,Fe³⁺的存在会抑制Cu²⁺的去除.

• Abstract：In order to remove both soluble heavy metal species and insoluble substances efficiently by flocculation,a novel water-soluble macromolecule heavy metal flocculant,mercaptoacetyl polyethyleneimine(MAPEI) was synthesized by reacting polyethyleneimine with mercaptoacetic acid.Its performance was tested using wastewater containing turbidity and Cu²⁺ as targets.The mechanism of removing Cu²⁺ and turbidity,and factors which affect the removal rates of Cu²⁺ and turbidity were studied,for example,pH,flocculant dosage,and settling time.The experimental results showed that:① MAPEIhas a strong affinity for Cu²⁺ and the removal rate of Cu²⁺ exceeded 95%;②The pHvalue has little effect on the removal of Cu²⁺ or turbidity in the pHrange 2～5.Lower pHwastewater is more suitable for the removal of turbidity,but a higher pHis more suitable for the removal of Cu²⁺;③ When Cu²⁺ and turbidity-causing substances coexist in a water sample,Cu²⁺ and turbidity-causing substances synergistically promote their mutual removal,and the residual concentration of Cu²⁺ and turbidity decrease further;④ The existence of Ca²⁺ in wastewater can promote the removal of Cu²⁺,and widens the optimum dosage range of MAPEI.When Fe³⁺ ions coexist in the wastewater,the removal rate of Cu²⁺ will decrease if the MAPEIdosage is too low.

• Key words：macromolecule heavy metal flocculant  copper wastewater  polyethyleneimine  mercaptoacetic acid  coordination  flocculation

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