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Insight Into the Effect of Natural Organic Matter on the Photooxidation of Arsenite Induced by Colloidal Ferric Hydroxides in Water by Yi Wu; Xingyun Huang; Jing Xu; Wenyu Huang; Jinjun Li; Gilles Mailhot; Feng Wu is a Environmental Science article available to read on EtoBox.

What is Insight Into the Effect of Natural Organic Matter on the Photooxidation of Arsenite Induced by Colloidal Ferric Hydroxides in Water about?

Surface complexation of arsenite (As(III)) on colloidal ferric hydroxide (CFH) plays an important role not only in the adsorptive immobilization of As(III) but also in the subsequent oxidation of As(III) to arsenate (As(V)) through light-induced ligand-to-metal charge transfer (LMCT) in water at near-neutral pH. However, the effects of natural organic matter (NOM), especially humic substances (HSs) and low molecular weight carboxylic acids (CAs), on the photochemistry of the CFH-As(III) system have not been sufficiently understood. In this work, the inhibition of photooxidation of As(III) in terms of the observed apparent rate constant (k obs) by six HSs (below 16 mg L−1) and seven CAs (below 2.5 mM) has been observed in water containing 66 μM Fe(III) and 5 μM As(III) at pH 7 under simulated solar irradiation consisting of UVA (λmax 365 nm) and UVB (λmax 313 nm) lights. Total inhibition factors (T) have been determined from the combined effect of light-screening factor (S) and competitive complexation factor (C), wherein both S and C varied with NOM concentration. S was obtained by determining the absorbance of NOM, and C was obtained by fitting modified Langmuir or Freundlich mode

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Author

Yi Wu; Xingyun Huang; Jing Xu; Wenyu Huang; Jinjun Li; Gilles Mailhot; Feng Wu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)