Solubility product (Ksp)-controlled removal of chromate and phosphate by hydrocalumite

Qian, Guangren, Feng, Linlin, Zhou, Ji Zhi, Xu, Yunfeng, Liu, Jianyong, Zhang, Jia and Xu, Zhi Ping (2012) Solubility product (Ksp)-controlled removal of chromate and phosphate by hydrocalumite. Chemical Engineering Journal, 181-182 251-258. doi:10.1016/j.cej.2011.11.074

Author Qian, Guangren
Feng, Linlin
Zhou, Ji Zhi
Xu, Yunfeng
Liu, Jianyong
Zhang, Jia
Xu, Zhi Ping
Title Solubility product (Ksp)-controlled removal of chromate and phosphate by hydrocalumite
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
Publication date 2012-02-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.cej.2011.11.074
Volume 181-182
Start page 251
End page 258
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
It has been revealed that hydrocalumite (Ca2Al–Cl–LDH) removes Cr (VI) via anion-exchange while P via dissolution–reprecipitation. In current work, the intercalation of Cr (VI) was relative to the remaining LDH, which resulted in the increase of Cr (VI) removal amount with increasing pH. In contrast, more Ca5(PO4)3OH was precipitated at initial pH 5.0 in the case of P removal, which was attributed to more hydrocalumite dissolved at such low pH. Moreover, the composition of the final solution in each case provided the evaluation of free ionic concentrations product (CP) which demonstrates that the formation of product was related to its CP value that was higher than or close to the corresponding Ksp. As Ca5(PO4)3OH or LDH–CrO4 has the lowest solubility product (Ksp) among all possible solid in each case, our results propose that the removal process of chromate and phosphate over hydrocalumite was controlled by Ksp of the product.
Keyword Hydrocalumite
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 25 November 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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