Formation of iron (hydr)oxides during the abiotic oxidation of Fe(II) in the presence of arsenate

被引：70
作者：
Song, Jia [1 ]
Jia, Shao-Yi [1 ]
Yu, Bo [1 ]
Wu, Song-Hai [1 ]
Han, Xu [2 ,3 ]
机构：
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China
[3] Tianjin Univ, Minist Educ, China Key Lab Syst Bioengn, Tianjin 300072, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2015年 / 294卷
基金：
中国国家自然科学基金;
关键词：
Abiotic oxidation; Arsenate; Ferrous; Iron (hydr)oxides; LEPIDOCROCITE GAMMA-FEOOH; ACID-MINE DRAINAGE; GREEN RUST; FERRIC ARSENATE; PHOSPHATE; TRANSFORMATION; FERRIHYDRITE; HEMATITE; REMOVAL; OXIDES;
D O I：
10.1016/j.jhazmat.2015.03.048
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Abiotic oxidation of Fe(II) is a common pathway in the formation of Fe (hydr)oxides under natural conditions, however, little is known regarding the presence of arsenate on this process. In hence, the effect of arsenate on the precipitation of Fe (hydr)oxides during the oxidation of Fe(II) is investigated. Formation of arsenic-containing Fe (hydr)oxides is constrained by pH and molar ratios of As:Fe during the oxidation Fe(II). At pH 6.0, arsenate inhibits the formation of lepidocrocite and goethite, while favors the formation of ferric arsenate with the increasing As:Fe ratio. At pH 7.0, arsenate promotes the formation of hollow-structured Fe (hydr)oxides containing arsenate, as the As:Fe ratio reaches 0.07. Arsenate effectively inhibits the formation of magnetite at pH 8.0 even at As:Fe ratio of 0.01, while favors the formation of lepidocrocite and green rust, which can be latterly degenerated and replaced by ferric arsenate with the increasing As:Fe ratio. This study indicates that arsenate and low pH value favor the slow growth of dense-structured Fe (hydr)oxides like spherical ferric arsenate. With the rapid oxidation rate of Fe(II) at high pH, ferric (hydr)oxides prefer to precipitate in the formation of loose-structured Fe (hydr)oxides like lepidocrocite and green rust. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：70 / 79
页数：10
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