Molecular-level investigations of effective biogenic phosphorus adsorption by a lanthanum/aluminum-hydroxide composite

Xu, R., Lyu, T. ORCID: 0000-0001-5162-8103, Zhang, M., Cooper, M. 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
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
Identifiers:
NumberType
10.1016/j.scitotenv.2020.138424DOI
S0048969720319379Publisher Item Identifier
1316115Other
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Linda Sullivan
Date Added: 20 Apr 2020 10:07
Last Modified: 26 May 2020 14:10
URI: http://irep.ntu.ac.uk/id/eprint/39691

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