[1]万琼,孙荡荡,曹逸希,等.纳米零价铁去除水中硝酸盐的研究及进展[J].中国给水排水,2023,39(16):21-28.
　WANQiong,SUNDang-dang,CAOYi-xi,et al.Research and Progress on Removing Nitrate from Water by Nano-zero-valent Iron[J].China Water & Wastewater,2023,39(16):21-28.
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纳米零价铁去除水中硝酸盐的研究及进展

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期数: 2023年第16期 页码: 21-28 栏目: 出版日期: 2023-08-17
Title:
Research and Progress on Removing Nitrate from Water by Nano-zero-valent Iron
作者:
万琼1， 孙荡荡1， 曹逸希2， 鞠恺1， 杨国红1， 鹿琳睿1， 李凌宜1， 张新艳1
（1.西安科技大学 建筑与土木工程学院，陕西 西安 710054；2.陕西省水务集团水生态综合开发有限公司，陕西 西安 710082）
Author(s):
WAN　Qiong1， SUN　Dang-dang1， CAO　Yi-xi2， JU　Kai1， YANG　Guo-hong1， LU　Lin-rui1， LI　Ling-yi1， ZHANG　Xin-yan1
（1. School of Architecture and Civil Engineering， Xi’an University of Science and Technology， Xi’an 710054， China； 2. Water Ecology Comprehensive Development Co. Ltd.， Shaanxi Water Affair Group， Xi’an 710082， China）
关键词:
纳米零价铁;  化学反硝化;  铁合金;  脱氮;  改性
Keywords:
nano-zero-valent iron;  chemical denitrification;  ferroalloy;  nitrogen removal;  modification
摘要:
氮是引起水体富营养化的主要因素之一，纳米零价铁（Nano?zero?valent iron， nZVI）可通过化学反硝化快速去除水中的NO3-，但对N2的选择性较低。通过对nZVI还原NO3-的研究进行归纳和总结，探讨了nZVI还原NO3-的基本原理、影响因素和提高对N2选择性的改性方法。酸性、高温、低DO、高nZVI/NO3-比、含Cu2+和Fe2+等离子的环境均有利于nZVI对NO3-的去除，而高DO、HCO3-、SO32-和Cr（Ⅵ）等离子及有机物的存在均不利于NO3-的去除。将nZVI进行表面活性剂、负载纳米材料及纳米铁合金改性，NO3-去除率和对N2选择性均得到不同程度的提高。其中表面活性剂改性能有效减少nZVI氧化和团聚现象，但对N2的选择性不足6%，而nZVI/Cu/TiO2合金对N2的选择性可达80%。在提高N2选择性方面，nZVI复合材料的种类决定了材料性质，而且原料制备方法会影响材料结构，对于复合材料的选取、制备方法及运行条件优化是未来研究的重点。
Abstract:
Nitrogen is one of the key factors in eutrophication. Although NO3- could be quickly removed from water by chemical denitrification of nano-zero-valent iron (nZVI), the selectivity for nitrogen is very low. The studies of nZVI reduction to the NO3- were summarized, and the basic principles, the influencing factors of the NO3- reduction by nZVI, and the methods of improving N2 selectivity were also introduced. Some conditions contributed the reduction of NO3- by nZVI, including acidic conditioning, high temperature, low DO, high nZVI/NO3- ratio, Cu2+ and Fe2+-containing environments. In contrast, high DO, the presence of HCO3-, SO32-, Cr(Ⅵ) and organic matter are not conducive to the removal of NO3-. Modifying nZVI with surfactants, loaded nano-materials and nano-iron alloys will promote the removal of NO3- and the N2 selectivity to varying degrees. The N2 selectivity was less than 6%, even though the modification of nZVI by surfactants effectively reduced the oxidation and agglomeration of nZVI. However, the N2 selectivity reached 80% in the nZVI/Cu/TiO2 alloy system. The types of nZVI composite materials and the preparation method of raw materials significantly affected the denitrification. In terms of improving the N2 selectivity, the studies showed that the type of nZVI composite determined the material properties, and the preparation method of raw materials affected the material structure. The selection of composite materials, the optimization of preparation methods and operating conditions will be focuses in the future.

相似文献/References:

[1]江宇,孙康,王东田,等.改性净水污泥负载纳米零价铁去除水中的Cr(Ⅵ)[J].中国给水排水,2020,36(13):20.
　JIANG Yu,SUN Kang,WANG Dong-tian,et al. Removal of Cr(Ⅵ) in Wastewater by Modified Waterworks Sludge Supported Nanoscale Zero-valent Iron [J].China Water & Wastewater,2020,36(16):20.

更新日期/Last Update: 2023-08-17