The formation of planar crystalline flocs of γ-FeOOH in Fe(II) coagulation and the influence of humic acid

被引：60

作者：

Li, Xian ^{[1
,2
]}

Graham, Nigel J. D. ^{[3
]}

Deng, Wensheng ^{[1
]}

Liu, Mengjie ^{[2
]}

Liu, Ting ^{[1
]}

Yu, Wenzheng ^{[2
]}

机构：

[1] Beijing Inst Technol, Sch Chem & Chem Engn, Beijing 100081, Peoples R China

[2] Chinese Acad Sci, State Key Lab Environm Aquat Chem, Key Lab Drinking Water Sci & Technol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

[3] Imperial Coll London, Dept Civil & Environm Engn, South Kensington Campus, London SW7 2AZ, England

来源：

WATER RESEARCH | 2020年 / 185卷

基金：

北京市自然科学基金;

关键词：

Fe(II) coagulation; Planar-like flocs; Crystalline gamma-FeOOH; HA; DO; pH; IRON-OXIDE; ORGANIC-MATTER; MICROCYSTIS-AERUGINOSA; ALPHA-FEOOH; WATER; OXIDATION; LEPIDOCROCITE; BREAKAGE; REGROWTH; PH;

D O I：

10.1016/j.watres.2020.116250

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Although Fe(II) salts have been widely used as coagulants in water treatment for many years, the underlying mechanisms of their performance remain unclear. Here, we present a detailed study of the coagulation behavior of Fe(II) salts and crystallization of flocs, and investigate the effect of humic acid (HA) under different DO concentrations and pH conditions. The behavior of Fe(II) and Fe(III) coagulants was found to be markedly different with the flocs from Fe(II) consisting of planar-like crystalline gamma-FeOOH in contrast to the small amorphous spherical-like flocs from Fe(III) dosing. The effect of HA on Fe(II) coagulation was different under different DO concentrations and pH, where by the growth of gamma-FeOOH was inhibited by the presence of HA, but independent of DO concentration and pH. It was found that Fe(II) was present within the internal structure of gamma-FeOOH, and a plausible formation mechanism is proposed. Firstly, planar nanoparticles of Fe(OH)(2) were formed via Fe(II) ion hydrolysis which then servedas the nucleus for subsequent crystal growth. With oxidation, Fe(II) on the surface of nanoparticles transformed to Fe(III). Finally, the formation of gamma-FeOOH in Fe(II) coagulation was accompanied by a change in solution colour to yellow. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：9

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