Effects of humic acid on enhanced removal of lead ions by polystyrene-supported nano-Fe (0) nanocomposite.

Abstract:

:Polymer-supported nanozero-valent iron composites (D001-nZVI) were fabricated for the removal of lead ions from aqueous solutions by embedding nZVI into the porous polystyrene anion exchanger D001. Humic acid (HA) was selected as a model species because of its ubiquitous existence to gain insight into the influencing factors in the actual application process. The iron contents of the composites were approximately 11.2%, and the smallest ZVI particle size was ~ 5 nm. The experimental results showed that the effect of HA on the reduction of lead ions by D001-nZVI was a concentration-dependent process. At low HA concentrations, the surface-competitive adsorption of HA and Pb2+ dominated; therefore, the removal efficiency of Pb2+ by D001-nZVI decreased from 97.5 to 90.2% with an increasing HA concentration. When the HA concentration increased to 30 mg/L or more, the lead ions removal remained constant with the following possible cooperation mechanism: the competitive adsorption of HA and Pb2+ on the nZVI surface and the well-dispersed particles were caused by electrostatic interactions between the HA coating and the nZVI surface. In addition, the adsorption complexation between HA and Pb2+ also had a positive effect on the removal of Pb2+ at higher concentrations of HA.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang L,Wei S,Jiang Z

doi

10.1038/s41598-020-76362-1

subject

Has Abstract

pub_date

2020-11-12 00:00:00

pages

19663

issue

1

issn

2045-2322

pii

10.1038/s41598-020-76362-1

journal_volume

10

pub_type

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