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Issue 5, 2013
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Layered double hydroxide ion exchangers on superparamagnetic microparticles for recovery of phosphate from waste water

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Abstract

Superparamagnetic microparticles modified with an ion exchange system are reported for the recovery of phosphate from waste water by a magnetic separation technique. Layered double hydroxides (LDH), anionic clays, are precipitated from an aqueous solution and deposited by an ultrasonic treatment on superparamagnetic microparticles consisting of Fe3O4 multicores embedded in a SiO2 matrix. Deposition can be conducted in a batch process as well as in a continuous way, using an ultrasonic flow cell. The obtained composite particles show good magnetic separability and have a specific surface area of around 100 m2 g−1. Zr doped LDH shows improved phosphate adsorption in waste water. After magnetic separation and regeneration, the composite particles are re-used which is demonstrated for four cycles. Phosphate ions are concentrated in the regeneration solution. Simple, low cost, and a fast continuous synthesis of the composite particles paves the way for application beyond lab scale in real waste water treatment plants.

Graphical abstract: Layered double hydroxide ion exchangers on superparamagnetic microparticles for recovery of phosphate from waste water

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Article information


Submitted
05 Oct 2012
Accepted
21 Nov 2012
First published
21 Nov 2012

J. Mater. Chem. A, 2013,1, 1840-1848
Article type
Paper

Layered double hydroxide ion exchangers on superparamagnetic microparticles for recovery of phosphate from waste water

K. Mandel, A. Drenkova-Tuhtan, F. Hutter, C. Gellermann, H. Steinmetz and G. Sextl, J. Mater. Chem. A, 2013, 1, 1840
DOI: 10.1039/C2TA00571A

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