纳米零价铁去除水中硝酸盐氮研究进展
Research Progress on Removal of Nitrate Nitrogen in Water by Nano-Zero-Valent Iron
杨笑颜 1余凡1
作者信息
- 1. 华北水利水电大学环境与市政工程学院,河南郑州 450046
- 折叠
摘要
水中硝酸盐氮(NO3--N)的危害对人类健康和生态环境构成了严重威胁,纳米零价铁(nZVI)可以通过化学反应反硝化技术快速去除水中NO3--N,但nZVI自身易团聚,表面活性颗粒不稳定,所以在NO3--N还原过程中存在着氮气(N2)的选择性较低、NO3--N去除率不理想的问题.通过对nZVI去除NO3--N技术的归纳总结,探讨了nZVI在还原NO3--N的基本原理,影响因素和提高去除效率和N2选择性的改性方法.通过负载纳米材料,表面活性剂及添加还原剂等,NO3--N去除率和N2选择性都会得到不同程度上的提高.不同的改性方法对nZVI的改性效果不同,也决定了nZVI复合材料对NO3--N的去除作用及氮气选择性提升.
Abstract
The harm of nitrate nitrogen(NO3--N)in water poses a serious threat to human health and ecological environment.Nano-zero-valent iron(nZVI)can quickly remove NO3--N in water by chemical reaction denitrification technology,but there are problems such as low selectivity of nitrogen(N2)and unsatisfactory removal rate of NO3--N.The basic principle,influencing factors and modification methods to improve the removal efficiency and N2 selectivity of nZVI in the reduction of NO3--N were discussed by summarizing the removal technology of nZVI.By loading nanomaterials,surface activators and reducing agents,the NO3--N removal rate and N2 selectivity will be improved to varying degrees.Different modification methods have different modification effects on nZVI,which also determines the removal of NO3--N by nZVI composites and the improvement of nitrogen selectivity.
关键词
纳米零价铁/硝酸盐氮/影响因素/改性方法Key words
nano zero-valent iron/NO3--N/influencing factors/modification method引用本文复制引用
出版年
2024
NETL
NSTL
万方数据