• 关键词：高分子重金属絮凝剂  含铜水样  二硫键  壳聚糖  絮凝

• 基金项目：国家自然科学基金资助项目(No20377020)

• 章敏
• 兰州交通大学环境与市政工程学院, 兰州 730070

• 常青
• 兰州交通大学环境与市政工程学院, 兰州 730070

• 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

• 王娟
• 兰州交通大学环境与市政工程学院, 兰州 730070

• 摘要：以壳聚糖、巯基乙酸等为原料合成了一种新型高分子重金属絮凝剂巯基乙酰壳聚糖(MAC),研究了其除Cu²⁺与去浊的机理,并对几个因素做了考察.实验结果表明:¹MAC具有除铜与去浊的性能,当MAC与HPAM复配时,效果优于单独使用MAC,Cu²⁺去除率可达98%以上;②用MAC处理Cu²⁺和浊度共存的体系时,废水中的重金属离子和致浊物质可以起到相互促进去除的作用,出水中[Cu²⁺]<0.5mg·L^-1,浊度<3NTU;原水浊度越大,越有利于Cu²⁺的去除;③Cu²⁺的去除率随原水pH值的增大而提高,浊度的去除率则反之.

• Abstract：Amacromolecular flocculant for heavy metals,mercaptoacetyl chitosan(MAC),was prepared by reacting chitosan with mercaptoacetic acid.In preliminary experiments,the flocculation performance of MACwas evaluated by using wastewater which contained Cu²⁺ and/or turbidity.Factors which affect the removal of Cu²⁺ and turbidity were studied and the experimental results showed that,¹MAC can remove both Cu²⁺ and turbidity from wastewater.The removal rate of Cu²⁺ by using MAC combined with anionic polyacrylamide is higher than that with MAC,the removal rate of Cu²⁺ reaches above 98%;When the water sample contained not only Cu²⁺ but also turbidity-causing substances,the removal rate of both Cu²⁺ and turbidity was promoted by the cooperative effects of each other,leaving a residual concentration of Cu²⁺ below 0.5 mg·L^-1 and the turbidity below 3NTU.Thus,Cu²⁺ is more easily removed by MAC when the water is more turbid;The removal rate of Cu²⁺ increases when the pHvalue increased(from 4.5 to 5.5),contrarily the removal rate of turbidity decreases at higher pH.

• Key words：macromolecule flocculant for heavy metal  copper water sample  disulfide bonds  chitosan  flocculation

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