Removal of nitrate from water by acid-washed zero-valent iron/ferrous ion/hydrogen peroxide: influencing factors and reaction mechanism

被引：14
作者：
Li, Yongye [1 ]
Fu, Fenglian [1 ]
Ding, Zecong [1 ]
机构：
[1] Guangdong Univ Technol, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China
来源：
WATER SCIENCE AND TECHNOLOGY | 2018年 / 77卷 / 02期
基金：
中国国家自然科学基金;
关键词：
ferrous ion; hydrogen peroxide; nitrate removal; zero-valent iron (ZVI); CORROSION PRODUCTS; HYDROGEN-PEROXIDE; WASTE-WATER; REDUCTION; IRON; NANOPARTICLES; GROUNDWATER; FE2+; 4-CHLOROPHENOL; REMEDIATION;
D O I：
10.2166/wst.2017.564
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this paper, a system consisting of acid-washed zero-valent iron (ZVI), ferrous ion (Fe-2(+)), and hydrogen peroxide (H2O2) was employed for the removal of nitrate (NO3-) from water, and the reaction mechanism for this is discussed. The effects of acid-washed ZVI, Fe-2(+), H2O2, and initial NO3+ concentration on nitrate removal were investigated. Acid-washed ZVI before and after reaction with nitrate were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Results reveal that the combined system can enhance the corrosion of ZVI and facilitate aqueous nitrate reduction. The products of nitrate reduction are mainly ammonium, with some N-2. The ZVI particles after reaction may have a core of ZVI with an oxidation layer mainly consisting of Fe3O4.
引用
收藏
页码：525 / 533
页数：9
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