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Identification of a new high-molecular-weight Fe-citrate species at low citrate-to-Fe molar ratios: Impact on arsenic removal with ferric hydroxide
Zhang, Ping; Zhang, Nan; Li, Zhejun; Yean, Sujin; Li, Hualin; Shipley, Heather J.; Kan, Amy T.; Chen, Wei; Tomson, Mason B.
2018-12
Source PublicationCHEMOSPHERE
ISSN0045-6535
Volume212Pages:50-55
AbstractFerric hydroxide precipitation and flocculation is the most commonly used method for the removal of arsenic in water treatment. However, citrate often interrupts the precipitation of ferric hydroxides and thus affects arsenic removal. To date, the mechanisms controlling the effects of citrate on arsenic removal with ferric hydroxide flocculation and precipitation at very low citrate-to-Fe molar ratios are not well understood. Herein, we report a new mechanism by which citrate inhibits arsenic removal using ferric hydroxide. At a substoichiometric citrate-to-Fe molar ratio of 0.28, citrate forms a high-molecular-weight Fe-citrate (Fe(4)Cit) species. The optimized structure of the Fe(4)Cit species was obtained by the density functional theory calculation. To the best of our knowledge, this study is the first to report the formation and to identify the structure of dominant Fe-citrate species at a very low citrate-to-Fe molar ratio. (C) 2018 Elsevier Ltd. All rights reserved.
KeywordArsenic removal Citrate Ferric hydroxide Molar ratio
DOI10.1016/j.chemosphere.2018.08.066
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000447478100007
PublisherPERGAMON-ELSEVIER SCIENCE LTD
The Source to ArticleWOS
Fulltext Access
Citation statistics
Document TypeJournal article
CollectionUniversity of Macau
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GB/T 7714
Zhang, Ping,Zhang, Nan,Li, Zhejun,et al. Identification of a new high-molecular-weight Fe-citrate species at low citrate-to-Fe molar ratios: Impact on arsenic removal with ferric hydroxide[J]. CHEMOSPHERE,2018,212:50-55.
APA Zhang, Ping.,Zhang, Nan.,Li, Zhejun.,Yean, Sujin.,Li, Hualin.,...&Tomson, Mason B..(2018).Identification of a new high-molecular-weight Fe-citrate species at low citrate-to-Fe molar ratios: Impact on arsenic removal with ferric hydroxide.CHEMOSPHERE,212,50-55.
MLA Zhang, Ping,et al."Identification of a new high-molecular-weight Fe-citrate species at low citrate-to-Fe molar ratios: Impact on arsenic removal with ferric hydroxide".CHEMOSPHERE 212(2018):50-55.
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