摘要
采用自制的巯基乙酰化胺甲基聚丙烯酰胺(MAAPAM)作为重金属絮凝剂,以模拟含Cu(Ⅱ)水样为研究对象,探究了捕集水力条件、初始Cu(Ⅱ)浓度、初始pH、共存有机质、致浊物质对MAAPAM捕集Cu(Ⅱ)性能的影响;并利用红外光谱、扫描电镜及能谱分析等表征手段探讨了MAAPAM捕集Cu(Ⅱ)的机理。结果表明,最佳捕集水力条件为快搅(搅拌速度140r/min)1.5min、慢搅(搅拌速度30r/min)15min;MAAPAM对不同Cu(Ⅱ)初始浓度的含Cu(Ⅱ)水样均具有良好的捕集效果;Cu(Ⅱ)的去除率随着体系初始pH的升高而升高,MAAPAM捕集Cu(Ⅱ)最佳pH为6.0;在低MAAPAM投加量下,柠檬酸钠、焦磷酸钠、EDTA等共存有机质对MAAPAM捕集Cu(Ⅱ)均具有一定的抑制影响,而共存腐殖酸对MAAPAM捕集Cu(Ⅱ)有促进作用;在高MAAPAM投加量下,共存有机质的存在对MAAPAM捕集Cu(Ⅱ)表现出的抑制影响基本消除。表征结果显示,MAAPAM高分子链中-SH与Cu(Ⅱ)发生了螯合作用,与共存有机质中配位体(M)-Cu的作用机理主要为脱络-螯合,有效地捕集废水中Cu(Ⅱ)。
Self-synthesized MAAPAM was utilized as a heavy metal flocculant to investigate its effectiveness in collecting Cu(Ⅱ)from simulated water samples.The study explored the effects of hydraulic conditions,initial Cu(Ⅱ)concentration,initial pH,and the presence of coexisting organic matter and turbidity-causing substances on the Cu(Ⅱ)removal efficiency of MAAPAM.Characterization techniques,including infrared spectroscopy,scanning electron microscopy,and energy-dispersive X-ray spectroscopy,were employed to elucidate the mechanisms behind Cu(Ⅱ)collection by MAAPAM.The results indicated that the optimal hydraulic conditions involved rapid stirring at 140 rpm for 1.5 minutes,followed by slow stirring at 30 rpm for 15 minutes.MAAPAM demonstrated effective Cu(Ⅱ)collection across various initial concentrations.The Cu(Ⅱ)removal rate increased with rising initial pH,with an optimal pH of 6.0 for Cu(Ⅱ)collection.At low MAAPAM dosages,coexisting organic substances such as sodium citrate,sodium pyrophosphate,and EDTA inhibited Cu(Ⅱ)collection,while humic acid enhanced it.At higher MAAPAM dosages,these substances largely eliminated the inhibition effect.Characterization results revealed that the-SH groups in the MAAPAM polymer chain chelated with Cu,and the interaction mechanism with the ligand(M)-Cu in coexisting organic matter primarily involved dechelation-chelation,effectively removing Cu(Ⅱ)from wastewater.
作者
管映兵
汤超
黄慧
王刚
GUAN Yingbing;TANG Chao;HUANG Hui;WANG Gang(Gansu Academy of Environmental Science and Design,730000,Lanzhou,China;School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,730070,Lanzhou,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2024年第12期39-44,共6页
Technology of Water Treatment
基金
甘肃省自然科学基金项目(20JR10RA441)。
关键词
重金属絮凝剂
含Cu(Ⅱ)废水
捕集
螯合
heavy metal flocculant
copper containing wastewater
capture
chelate
