Enhanced phosphorus locking by novel lanthanum/aluminum–hydroxide composite: implications for eutrophication control

Xu, R., Zhang, M., Mortimer, R.J.G. ORCID: 0000-0003-1292-8861 and Pan, G. ORCID: 0000-0003-0920-3018, 2017. Enhanced phosphorus locking by novel lanthanum/aluminum–hydroxide composite: implications for eutrophication control. Environmental Science & Technology, 51 (6), pp. 3418-3425. ISSN 0013-936X

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Lanthanum (La) bearing materials have been widely used to remove phosphorus (P) in water treatment. However, it remains a challenge to enhance phosphate (PO4) adsorption capacity and La usage efficiency. In this study, La was co-precipitated with aluminum (Al) to obtain a La/Al-hydroxide composite (LAH) for P adsorption. The maximum PO4 adsorption capacities of LAH (5.3% La) were 76.3 and 45.3 mg P g-1 at pH 4.0 and 8.5, which were 8.5 and 5.3 times higher than those of commercially available La-modified bentonite (Phoslock®, 5.6% La), respectively. P K-edge X-ray absorption near edge structure analysis showed that PO4 was preferentially bonded with Al under weakly acid conditions (pH 4.0), while tended to associate with La under alkaline conditions (pH 8.5). La LIII-edge extended X-ray absorption fine structure analysis indicated that PO4 was bonded on La sites by forming inner sphere bidentate-binuclear complexes and oxygen defects exhibited on LAH surfaces, which could be active adsorption sites for PO4. The electrostatic interaction, ligand exchange and oxygen defects on LAH surfaces jointly facilitated PO4 adsorption but with varied contribution under different pH conditions. The combined contribution of two-component of La and Al may be an important direction for the next generation of commercial products for eutrophication mitigation.

Item Type: Journal article
Publication Title: Environmental Science & Technology
Creators: Xu, R., Zhang, M., Mortimer, R.J.G. and Pan, G.
Publisher: ACS Publications
Date: 21 March 2017
Volume: 51
Number: 6
ISSN: 0013-936X
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Jill Tomkinson
Date Added: 14 Mar 2017 14:08
Last Modified: 22 Jan 2021 09:24
URI: https://irep.ntu.ac.uk/id/eprint/30379

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