摘要
在模拟含Cu2+废水中加入Mg2+和Al3+,以NaOH为沉淀剂,研究金属盐水解即时合成层状双氢氧化物去除Cu2+的可行性,同时考察了体系终点pH值、配料中Mg/Cu摩尔比值及反应温度和时间对Cu2+去除率的影响,探讨了Cu2+去除机理及层状双氢氧化物形成过程。结果表明,实验条件下体系终点pH值显著影响Cu2+去除率,在pH值8.0~11.0范围内去除效果较好,达99%以上。通过X射线衍射分析结合即时合成法特点,废水中Cu2+主要是在晶核生成阶段以Cu/Mg/Al三元层状双氢氧化物形式被去除;三元层状双氢氧化物的形成由反应体系中Al3+、Cu2+、Mg2+分步水解导致,最适pH值约为9.0。
The layered double hydroxides(LDHs) were in-situ prepared by hydrolyses of copper,magnesium,and aluminium ions with sodium hydroxide solutions for removing copper ions from wastewater.The effects of medium pH,magnesium/copper molar ratio,reaction temperature and time on the removal efficiencies of copper ions were investigated.The results show that the removal efficiencies are significantly affected by the medium pH,and the removal efficiencies are more than 99% in the range of pH 8.0~11.0.Other factors have slight effects on the removal efficiencies.X-ray diffraction analyses of these prepared LDHs indicate that their layers are composed of copper,magnesium,and aluminium ions,and the copper ions are removed at the crystal formation stage of these LDHs.These Cu/Mg/Al-LDHs are formed by stepwise hydrolyses from aluminium to copper to magnesium ions,with the suitable pH value being 9.0.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2012年第3期447-453,共7页
Acta Petrologica et Mineralogica
基金
内蒙古自然科学基金(2010BS0606)
内蒙古大学国家大学生创新性实验计划项目(101012615)
关键词
层状双氢氧化物
CU2+
废水
去除率
layered double hydroxide
copper ion
wastewater
removal efficiency