Removal efficiency of arsenate and phosphate from aqueous solution using layered double hydroxide materials: Intercalation vs. precipitation

Xu, Yunfeng, Dai, Yingchun, Zhou, Jizhi, Xu, Zhi Ping, Qian, Guangren and Lu, G. Q. Max (2010) Removal efficiency of arsenate and phosphate from aqueous solution using layered double hydroxide materials: Intercalation vs. precipitation. Journal of Materials Chemistry, 20 22: 4684-4691. doi:10.1039/b926239c


Author Xu, Yunfeng
Dai, Yingchun
Zhou, Jizhi
Xu, Zhi Ping
Qian, Guangren
Lu, G. Q. Max
Title Removal efficiency of arsenate and phosphate from aqueous solution using layered double hydroxide materials: Intercalation vs. precipitation
Journal name Journal of Materials Chemistry   Check publisher's open access policy
ISSN 0959-9428
1364-5501
Publication date 2010-06-14
Sub-type Article (original research)
DOI 10.1039/b926239c
Open Access Status Not Open Access
Volume 20
Issue 22
Start page 4684
End page 4691
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2011
Language eng
Formatted abstract
Adsorption behaviours of arsenate and phosphate over Mg-based and Ca-based layered double hydroxide (LDH) adsorbents have been examined in kinetics and thermodynamics. Removal of these anions from aqueous solution follows the Lagergren first-order and/or pseudo-second-order model, and the adsorption isotherm is well fitted with either the Langmuir or the Freundlich model. Structure analysis of used LDH adsorbents reveals that two processes, i.e. intercalation and precipitation, are responsible for the anion removal. Adsorption over the Mg-based LDH adsorbent occurs by way of intercalation into the interlayer spacing while that over the Ca-based adsorbent occurs by means of precipitation of dissolved Ca2+ with the anion. More particularly, we have found that As(V) at a concentration below 10 mg/L can be very efficiently removed through intercalation into the interlayer of reconstructed MgAl-LDHs, with less than 0.010 mg/L of As left in solution. We have also noted that phosphate at [P] up to 100 mg/L can be quickly and effectively removed through precipitation with CaAl-Cl-LDH, giving rise to ∼0.1 mg/L of P left in solution with the maximum adsorption amount up to 135 mg/g. Therefore, these two LDH materials (calcined Mg3Al-CO3-LDH and uncalcined Ca2Al-Cl-LDH) are potential cost-effective adsorbents for arsenate and phosphate, respectively. © 2010 The Royal Society of Chemistry
Keyword Drinking-water
West-bengal
Groundwater
Adsorption
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Engineering Publications
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Sun, 13 Jun 2010, 10:03:07 EST