Iron(III)-induced photooxidation of arsenite in the presence of carboxylic acids and phenols as model compounds of natural organic matter.

Abstract:

:Iron species have essential influence on the environmental/geochemical behaviors of arsenic species in water and soil. Colloidal ferric hydroxide (CFH) induces photooxidation of arsenite (As(III)) to arsenate (As(V)) in water at neutral pH through surface complexation and ligand-to-metal charge transfer (LMCT). However, the effect of the co-existing natural organic matter (NOM) on the complexation-photolysis in this process has remained unclear. In the present work, the photooxidation of As(III) induced by CFH was investigated in the presence of various carboxylic acids and polyphenols as simple model compounds of NOM. Two different light sources of ultraviolet A (UVA) (λmax = 365 nm) and ultraviolet B (UVB) (λmax = 313 nm) were used for photooxidation treatment of the experimental ternary system and the control binary system respectively. The obtained results demonstrated that all investigated NOM inhibited the photooxidation of As(III) in the As(III)/CFH system at pH 7. Moreover, the correlation analysis between the pseudo-first order rate constant kobs and various property parameters of NOM showed that the stable constant for the complexation between Fe(III) and NOM (logKFe-NOM) as well as the molecular weight of NOM and the percentages of total acidity of NOM exhibited significant correlations. A simple quantitative structure-activity relationship (QSAR) model was established between kobs and these three parameters utilizing a multiple linear regression method, which can be employed to estimate the photooxidation efficiency of As(III) in the presence of ferric iron and NOM. Thus, the present work contributes to the understanding of the environmental interactions between NOM and iron.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Huang X,Peng Y,Xu J,Wu F,Mailhot G

doi

10.1016/j.chemosphere.2020.128142

subject

Has Abstract

pub_date

2021-01-01 00:00:00

pages

128142

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(20)32337-7

journal_volume

263

pub_type

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