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Xu, R., Lyu, T. 
ORCID: 0000-0001-5162-8103, Zhang, M., Cooper, M. ORCID: 0000-0002-1864-1434 and Pan, G. ORCID: 0000-0003-0920-3018,
2020.
Molecular-level investigations of effective biogenic phosphorus adsorption by a lanthanum/aluminum-hydroxide composite.
Science of the Total Environment, 725: 138424.
ISSN 0048-9697
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Abstract
Biogenic phosphorus (P), such as organic P and inorganic pyrophosphates, could substantially contribute towards eutrophication in aquatic systems by internal loading of P from sediment through P species transformation. Previous eutrophication management studies mainly focus on the removal of orthophosphate (Ortho-P), however, an effective approach for biogenic P control from water sources, prior to incorporation in sediment, is still lacking. In this study, a lanthanum/aluminum-hydroxide (LAH) composite was demonstrated to provide both superior removal of Ortho-P and biogenic P, employing myo-inositol hexakisphosphate (IHP) and pyrophosphate (Pyro-P) as model compounds. The maximum IHP and Pyro-P adsorption capacities by LAH attained 36.4 and 21.8 mg P g−1, respectively. In order to understand the mechanisms of adsorption, zeta potential, 31P solid-state nuclear magnetic resonance (NMR) spectroscopy and P K-edge X-ray absorption near edge structure (XANES) techniques were used to characterize the LAH after adsorption. The results supported the hypothesis that the interaction between LAH and P species was through surface adsorption, by the formation of inner-sphere complexes. Linear combination fitting results of XANES data indicated that IHP and Pyro-P preferentially bonded with La-hydroxide in LAH. This study elucidates the adsorption properties and binding mechanisms of IHP and Pyro-P on lanthanum-bearing compounds at the molecular level, indicating that LAH is a promising material for the control of eutrophication.
| Item Type: | Journal article | ||||||||
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| Publication Title: | Science of the Total Environment | ||||||||
| Creators: | Xu, R., Lyu, T., Zhang, M., Cooper, M. and Pan, G. | ||||||||
| Publisher: | Elsevier | ||||||||
| Date: | 10 July 2020 | ||||||||
| Volume: | 725 | ||||||||
| ISSN: | 0048-9697 | ||||||||
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| Divisions: | Schools > School of Animal, Rural and Environmental Sciences | ||||||||
| Record created by: | Linda Sullivan | ||||||||
| Date Added: | 20 Apr 2020 10:07 | ||||||||
| Last Modified: | 31 May 2021 15:04 | ||||||||
| URI: | https://irep.ntu.ac.uk/id/eprint/39691 |
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