In:
Scientific Reports, Springer Science and Business Media LLC, Vol. 8, No. 1 ( 2018-07-09)
Abstract:
Precipitation of Fe-hydroxide (FH) critically influences the sequestration of PO 4 and organic matter (OM). While coatings of pre-sorbed OM block FH surfaces and decrease the PO 4 adsorption capacity, little is known about how OM/Fe coprecipitation influences the PO 4 adsorption. We aimed to determine the PO 4 adsorption behaviors on humic acid (HA)-Fe coprecipitates in relation to surface and structural characteristics as affected by HA types and C/(C + Fe) ratios using the Fe and P X-ray absorption spectroscopy. With increasing C/(C + Fe) ratios, the indiscernible changes in the proportion of near-surface C for coprecipitates containing HA enriched in polar functional groups implied a relatively homogeneous distribution between C and Fe domains. Wherein PO 4 adsorbed on FH dominated the P inventory on coprecipitates, yielding PO 4 sorption properties nearly equivalent to that of pure FH. Structural disruptions of FH caused by highly associations with polar functional groups of HA enhanced the C solubilisation. While polar functional groups were limited, coprecipitates consisted of core FH with surface outgrowth of HA. Although surface-attached HA that was vulnerable to solubilisation provided alternatively sites for PO 4 via ternary complex formation with Fe bridges, it also blocked FH surfaces, leading to a decrease in PO 4 adsorption.
Type of Medium:
Online Resource
ISSN:
2045-2322
DOI:
10.1038/s41598-018-28568-7
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2018
detail.hit.zdb_id:
2615211-3
