A novel lanthanum-modified bentonite, Phoslock, for phosphate removal from wastewaters

Haghseresht, F., Wang, Shaobin and Do, D. D. (2009) A novel lanthanum-modified bentonite, Phoslock, for phosphate removal from wastewaters. Applied Clay Science, 46 4: 369-375. doi:10.1016/j.clay.2009.09.009


Author Haghseresht, F.
Wang, Shaobin
Do, D. D.
Title A novel lanthanum-modified bentonite, Phoslock, for phosphate removal from wastewaters
Journal name Applied Clay Science   Check publisher's open access policy
ISSN 0169-1317
1872-9053
Publication date 2009-12
Sub-type Article (original research)
DOI 10.1016/j.clay.2009.09.009
Volume 46
Issue 4
Start page 369
End page 375
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
Phoslock®, a lanthanum-modified bentonite, has been investigated for phosphate uptake from synthetic and real wastewaters in laboratory and field. In laboratory tests, equilibrium and kinetics were studied at various temperatures, ionic strength, and pHs. The investigation indicated that phosphate adsorption occurs through a chemisorption process. The activation energy of the adsorption process was calculated based on pseudo-second order rate constant. The maximum adsorption capacity of Phoslock was unaffected at pH 5–7, but decreased at higher pHs. The monovalent phosphate anion, H2PO4−, had the greatest affinity for the adsorbent surface. Furthermore, it was also shown that the activation energy was lower at a higher solution pH attributed to the loss of adsorption sites at the higher pHs while it remained unaffected by the ionic strength of the solution. A field test also demonstrated that the Phoslock works well for phosphate uptake in polluted waters.
Keyword Phosphate adsorption
Modified bentonite
Lanthanum
Chemisorption
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Sun, 27 Dec 2009, 00:05:33 EST