Phosphate Removal in Relation to Structural Development of Humic Acid-Iron Coprecipitates.

ABSTRACT: Precipitation of Fe-hydroxide (FH) critically influences the sequestration of PO₄ and organic matter (OM). While coatings of pre-sorbed OM block FH surfaces and decrease the PO₄ adsorption capacity, little is known about how OM/Fe coprecipitation influences the PO₄ adsorption. We aimed to determine the PO₄ 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. Wh

SUBMITTER: Chen KY 

PROVIDER: S-EPMC6037709 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature