Zero-valent iron-facilitated reduction of nitrate: Chemical kinetics and reaction pathways

被引：73

作者：

Zhang, Yiping ^{[1
]}

Douglas, Grant B. ^{[2
]}

Pu, Long ^{[3
]}

Zhao, Quanlin ^{[1
]}

Tang, Yan ^{[3
]}

Xu, Wei ^{[3
]}

Luo, Bihuan ^{[3
]}

Hong, Wei ^{[3
]}

Cui, Lili ^{[4
]}

Ye, Zhengfang ^{[1
]}

机构：

[1] Peking Univ, Key Lab Water & Sediment Sci, Minist Educ, Dept Environm Engn, Beijing 100871, Peoples R China

[2] CSIRO Land & Water, Ctr Environm & Life Sci, Private Bag 5, Wembley, WA 6913, Australia

[3] Sichuan Jinsha Nano Technol Co Ltd, Panzhihua Vanadium & Titanium Ind Pk, Panzhihua 730900, Sichuan Provinc, Peoples R China

[4] Hebei Inst Architectural Engn, Hebei Energy & Environm Engn, Zhangjiakou 075000, Hebei, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2017年 / 598卷

关键词：

Zero-valent iron (ZVI); Denitrification; Kinetics; Reaction pathway; CONTAMINATED GROUNDWATER; REMOVAL; DENITRIFICATION; NANOPARTICLES; BARRIER; WATER; ZVI; REMEDIATION; PARTICLES; BACTERIA;

D O I：

10.1016/j.scitotenv.2017.04.071

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The kinetics and mechanisms of the reduction of NOS in solution to NH3 by 1.5 mu m diameter zero-valent iron (ZVI(1.5)) particles has been examined. The effects of initial pH, ZVI(1.5) particle concentration and initial NO3- concentration were also investigated. Results indicate that denitrification by ZVI(1.5) is primarily a pH-dependent, surface-mediated process. At an initial ZVI(1.5) concentrations of 0.832 g/L, and an optimal initial pH of 1.62, the NO3- concentration was reduced by 95% from 12.50 mg/L-N to 0.65 mg/L-N, in 120 min. Several kinetic models were used to describe the denitrification process based on the ZVI(1.5):NO3- ratio. Based on mineralogical and surface analysis of the reacted ZVI(1.5), and detailed solution chemical analysis, the denitrification reaction pathway involves oxidation and partial dissolution of the ZVI(1.5) with the generation of Fe2+ and NO2- intermediates prior to formation of Fe3+ oxyhydroxide (goethite) and NH3. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1140 / 1150

页数：11

共 71 条

[1] Reductive removal of Cr(VI) by starch-stabilized Fe0 nanoparticles in aqueous solution [J].