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The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid
Li, Xian; Graham, Nigel J. D.; Deng, Wensheng; Liu, Mengjie; Liu, Ting; Yu, Wenzheng
2020-10-15
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume185Pages:1-10
AbstractAlthough 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.
Department中国科学院饮用水科学与技术重点实验室
KeywordFe(II) coagulation Planar-like flocs Crystalline gamma-FeOOH HA DO pH
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45369
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Li, Xian,Graham, Nigel J. D.,Deng, Wensheng,et al. The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid[J]. WATER RESEARCH,2020,185:1-10.
APA Li, Xian,Graham, Nigel J. D.,Deng, Wensheng,Liu, Mengjie,Liu, Ting,&Yu, Wenzheng.(2020).The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid.WATER RESEARCH,185,1-10.
MLA Li, Xian,et al."The formation of planar crystalline flocs of gamma-FeOOH in Fe(II) coagulation and the influence of humic acid".WATER RESEARCH 185(2020):1-10.
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