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Species-Specific Uptake of Arsenic on Confined Metastable 2-Line Ferrihydrite: A Combined Raman-X-Ray Photoelectron Spectroscopy Investigation of the Adsorption Mechanism
Chennu Sudhakar, Avula Anil Kumar, Radha Gobinda Bhuin, Soujit Sen Gupta, Ganapati Natarajan,
Published in American Chemical Society
2018
Volume: 6
   
Issue: 8
Pages: 9990 - 10000
Abstract
The present study is targeted toward understanding the interaction between important and technologically relevant polymorphs of iron oxides/oxyhydroxides with arsenic species at neutral pH. The existence of various arsenic (As) species in solution was verified by Raman measurements. Their species-dependent adsorption on the affordable arsenic removal media, confined metastable 2-line ferrihydrite (CM2LF) was investigated. The results were compared with common adsorption media, hematite (α-Fe2O3) and magnetite (Fe3O4). X-ray photoelectron spectroscopy was used to investigate the changes in the core levels of Fe 2p and As 3d resulting from the uptake of arsenic species. Binding of various As species with CM2LF was confirmed by FTIR studies. Raman adsorption data were found to fit a pseudo-second-order model. Results of this study show the synthesized nanocomposite of CM2LF to be very effective for the removal of As(III) and As(V) species in comparison to various materials at neutral pH. A model for the adsorption of As(III) and As(V) species in water on a ferrihydrite particle was developed. This accounted for the large uptake capacity. Copyright © 2018 American Chemical Society.
About the journal
JournalData powered by TypesetACS Sustainable Chemistry and Engineering
PublisherData powered by TypesetAmerican Chemical Society
ISSN21680485
Open AccessNo
Concepts (14)
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    Fourier transform infrared spectroscopy
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    Hematite
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    Magnetite
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    Pollution control
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    X ray photoelectron spectroscopy
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    ADSORPTION DATA
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    Adsorption mechanism
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    Arsenic removal
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    ARSENIC SPECIES
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    PSEUDO-SECOND ORDER MODEL
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    Raman measurements
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    SPECIES SPECIFICS
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    UPTAKE CAPACITY
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    Adsorption