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

Xu, R, Lyu, T ORCID: https://orcid.org/0000-0001-5162-8103, Zhang, M, Cooper, M ORCID: https://orcid.org/0000-0002-1864-1434 and Pan, G ORCID: https://orcid.org/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

Preview

Text 39691_a608_Pan.pdf - Post-print Download (1MB) | Preview

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:	Number Type 10.1016/j.scitotenv.2020.138424 DOI S0048969720319379 Publisher Item Identifier 1316115 Other
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

Actions (login required)

Edit View

Statistics

Views

Downloads