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New Insights Into Arsenate Removal During Siderite Oxidation by Dissolved Oxygen by Wenting Yu; Yuanyuan Cao; Song Yan; Huaming Guo is a Environmental Science article available to read on EtoBox.

What is New Insights Into Arsenate Removal During Siderite Oxidation by Dissolved Oxygen about?

Nowadays, arsenic (As) pollution in aquatic environments severely threatens the health of human beings. Although it has been known that siderite is capable of As adsorption and dissolved oxygen (DO) enhances the adsorption, effects of DO concentrations on As(V) adsorption onto siderite remain elusive. In this study, As(V) removal was investigated by synthesized siderite from aqueous solutions with different DO concentrations. Arsenic(V) adsorption kinetics were conformed to the pseudo-second-order model. As(V) adsorption onto siderite was enhanced in the presence of dissolved oxygen, but the excess DO concentration did not increase As(V) adsorption since Fe(III) oxides were coated onto the pristine siderite surface, preventing the mineral from further oxidation. With the increase in DO concentration, the rate of Fe(II) oxidation decreased, which was the kinetic-limited step during As(V) removal by siderite with the presence of DO. The theoretically generated Fe(III) was stoichiometrically proportional to the consumed oxygen. Microscopic characteristics by means of XRD, SEM, TEM, FTIR and XPS indicated that the adsorption was dominated by the chemical process via the As(V) complexat

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Author

Wenting Yu; Yuanyuan Cao; Song Yan; Huaming Guo

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)