Effective removal of pyrophosphate by Ca-Fe-LDH and its mechanism

Wu, Yueying, Yu, Ying, Zhou, Ji Zhi, Liu, Jianyong, Chi, Ying, Xu, Zhi Ping and Qian, Guangren (2012) Effective removal of pyrophosphate by Ca-Fe-LDH and its mechanism. Chemical Engineering Journal, 179 72-79. doi:10.1016/j.cej.2011.10.053


Author Wu, Yueying
Yu, Ying
Zhou, Ji Zhi
Liu, Jianyong
Chi, Ying
Xu, Zhi Ping
Qian, Guangren
Title Effective removal of pyrophosphate by Ca-Fe-LDH and its mechanism
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
1873-3212
Publication date 2012-01-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.cej.2011.10.053
Volume 179
Start page 72
End page 79
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
Pyrophosphate (PP), as a dispersant in industrial activities, has attracted much attention due to its contribution to the eutrophication in aquatic ecosystem. This study investigated the efficient PP removal over Ca-based layered double hydroxide (LDH). The PP removal amount was 4.54 mmol P/g LDH at initial total phosphate concentration [P] ranging from 1.61 to 6.45 mmol/L in which LDH dissolved and Ca2P2O7·2H2O precipitated. Moreover, LDH hydrolysis led to Ca-containing Fe hydroxide (Ca0.66FeO1.51(OH)1.30·0.35H2O) formation. The major PP removal route was precipitation as Ca2P2O7·2H2O while Ca-containing Fe hydroxide removed PP through surface capture only in a small portion. We concluded that the combination of surface capture and precipitation process enhanced PP removal over Ca–Fe–LDH and made it as a potential material to remove PP efficiently.
Keyword Pyrophosphate
Layered double hydroxide (LDH)
Dissolution, precipitation
Adsorption
Layered double hydroxides
Ion-exchange
Aqueous-solutions
Phosphate
Adsorption
Iron
Hydrotalcite
Ferrihydrite
Chemistry
Adsorbent
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 25 October 2011.

 
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