引用本文:王刚,王志科,常青,徐敏,等.改性聚乙烯亚胺捕集和回收水中的Cu2+[J].环境科学研究,2017,30(6):953-959.
WANG Gang,WANG Zhike,CHANG Qing,XU Min,et al.Removal and Recovery of Copper Ions from Aqueous Solutions by Modified Polyethyleneimine[J].Reserrch of Environmental Science,2017,30(6):953-959.]
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 354次   下载 431 本文二维码信息
码上扫一扫!
分享到: 微信 更多
改性聚乙烯亚胺捕集和回收水中的Cu2+
王 刚, 王志科, 常 青, 徐 敏
兰州交通大学环境与市政工程学院, 甘肃 兰州 730070
摘要:
为提高含铜废水的处理效果及简化处理流程,采用CS2、NaOH对聚乙烯亚胺进行改性,制备出一种新型高分子絮凝剂——PEX(聚乙烯亚胺基黄原酸钠). 以含Cu2+水样为处理对象,探讨了初始ρ(Cu2+)、pH、共存无机物质、有机物质以及浊度对PEX捕集Cu2+性能的影响,并考察了螯合絮体中Cu2+的回收情况. 结果表明:PEX对含Cu2+水样具有很好的捕集性能,Cu2+去除率最高可达到100%;PEX对Cu2+的去除效果随着水样初始pH的升高而增强,但pH位于PEX等电点处时,Cu2+去除率有所降低. 在较低的PEX投加量下,水样中共存的NaCl、CaCl2、NaNO3、Na2SO4、柠檬酸、焦磷酸钠对PEX去除Cu2+均可起到促进作用,而共存的EDTA、氨基乙酸、浊度对PEX去除Cu2+具有一定的抑制作用;增加PEX投加量后,可减弱或消除上述影响. 螯合絮体采用HNO3溶液进行静态浸泡30 d后,Cu的回收率可达100%. 研究显示,PEX能有效去除和回收水样中的Cu2+.
关键词:  高分子絮凝剂  重金属  含铜废水  螯合  回收
DOI:
分类号:
基金项目:国家自然科学基金项目(51368030)
Removal and Recovery of Copper Ions from Aqueous Solutions by Modified Polyethyleneimine
WANG Gang, WANG Zhike, CHANG Qing, XU Min
School of Environmental and Municipal Engineering, LanzhouJiaotong University, Lanzhou 730070, China
Abstract:
Abstract: The increasing production of copper ion-containing wastewater is becoming one of the most serious environmental problems. Recently, the removal of copper ions from industrial effluents has attracted a lot of attention. In order to improve the treatment efficiency of sewage containing copper ions as well as to simplify the process, a novel macromolecule flocculant polyethyleneimine-sodium xanthogenate (PEX) was prepared by modifying polyethyleneimine with carbon disulfide and sodium hydroxide. The effects of initial Cu2+ concentration, pH, coexisting inorganic substances, organic substances and turbidity on the performance of trapping Cu2+ from aqueous solutions by PEX were studied. The recovery of copper was also investigated from the flocs. The results showed that PEX had a strong copper ion trapping capability, and the removal of Cu2+ could reach 100% under optimal conditions. The removal efficiency of Cu2+ by PEX increased with the increase of the initial pH value of the water sample, but the removal rate of Cu2+ decreased at the isoelectric point of PEX. When the dosage of PEX was lower, the coexistence of NaCl, CaCl2, NaNO3, Na2SO4, citric acid and sodium pyrophosphate in the water sample could promote the removal of Cu2+, but the existence of EDTA, aminoacetic acid and turbidity depressed the removal of Cu2+. However, these influences could be reduced or eliminated through increasing the dosage of PEX. The recovery rate of copper in the flocs was 100% when the flocs were immersed in nitric acid solutions for 30 days. The research showed that PEX could effectively remove and recover copper ions from aqueous solutions.
Key words:  macromolecule flocculant  heavy metal  copper-containing wastewater  chelation  recovery