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Improved arsenic(III) adsorption by Al2O3 nanoparticles and H2O2: Evidence of oxidation to arsenic(V) from X-ray absorption spectroscopy.

Önnby, Linda LU ; Suresh, Prashanth LU ; Sigfridsson Clauss, Kajsa LU ; Wendt, Ola LU ; Carlson, Stefan LU and Kirsebom, Harald LU (2014) In Chemosphere 113. p.151-157
Abstract
We have investigated the oxidation of inorganic As(III) with H2O2 catalysed by Al2O3, using X-ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopy. The effects of different reaction conditions (pH, time and initial H2O2 concentration) were also studied as were the kinetics of the oxidation reaction. We demonstrated that As(III) was oxidized to As(V) in the presence of H2O2 and Al2O3. Furthermore, all arsenic species found on the Al2O3 surface were in the As(V) state. The presence of both Al2O3 and H2O2 was necessary for oxidation of As(III) to take place within the period of time studied. The oxidation kinetics indicate a mechanism where reversible As(III) binding to the alumina surface is followed... (More)
We have investigated the oxidation of inorganic As(III) with H2O2 catalysed by Al2O3, using X-ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopy. The effects of different reaction conditions (pH, time and initial H2O2 concentration) were also studied as were the kinetics of the oxidation reaction. We demonstrated that As(III) was oxidized to As(V) in the presence of H2O2 and Al2O3. Furthermore, all arsenic species found on the Al2O3 surface were in the As(V) state. The presence of both Al2O3 and H2O2 was necessary for oxidation of As(III) to take place within the period of time studied. The oxidation kinetics indicate a mechanism where reversible As(III) binding to the alumina surface is followed by irreversible oxidation by H2O2 leading to strongly bound As(V). Results from this study indicate that there is a surface-catalysed oxidation of As(III) on Al2O3 by H2O2, a reaction that can take place in nature and can be of help in the development of novel treatment systems for As(III) removal. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemosphere
volume
113
pages
151 - 157
publisher
Elsevier
external identifiers
  • pmid:25065803
  • wos:000340335200022
  • scopus:84904696579
ISSN
1879-1298
DOI
10.1016/j.chemosphere.2014.04.097
language
English
LU publication?
yes
id
6720df47-2dcc-4c1a-93a4-db652ea2113f (old id 4581236)
date added to LUP
2014-09-05 16:03:42
date last changed
2017-07-23 03:19:40
@article{6720df47-2dcc-4c1a-93a4-db652ea2113f,
  abstract     = {We have investigated the oxidation of inorganic As(III) with H2O2 catalysed by Al2O3, using X-ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopy. The effects of different reaction conditions (pH, time and initial H2O2 concentration) were also studied as were the kinetics of the oxidation reaction. We demonstrated that As(III) was oxidized to As(V) in the presence of H2O2 and Al2O3. Furthermore, all arsenic species found on the Al2O3 surface were in the As(V) state. The presence of both Al2O3 and H2O2 was necessary for oxidation of As(III) to take place within the period of time studied. The oxidation kinetics indicate a mechanism where reversible As(III) binding to the alumina surface is followed by irreversible oxidation by H2O2 leading to strongly bound As(V). Results from this study indicate that there is a surface-catalysed oxidation of As(III) on Al2O3 by H2O2, a reaction that can take place in nature and can be of help in the development of novel treatment systems for As(III) removal.},
  author       = {Önnby, Linda and Suresh, Prashanth and Sigfridsson Clauss, Kajsa and Wendt, Ola and Carlson, Stefan and Kirsebom, Harald},
  issn         = {1879-1298},
  language     = {eng},
  pages        = {151--157},
  publisher    = {Elsevier},
  series       = {Chemosphere},
  title        = {Improved arsenic(III) adsorption by Al2O3 nanoparticles and H2O2: Evidence of oxidation to arsenic(V) from X-ray absorption spectroscopy.},
  url          = {http://dx.doi.org/10.1016/j.chemosphere.2014.04.097},
  volume       = {113},
  year         = {2014},
}