Study on the surface speciation of Fe-pillared montmorillonite and mechanism of its photocatalytic effect on degradation of ionic dye rhodamine-B

Study on the surface speciation of Fe-pillared montmorillonite and mechanism of its... Article history: The surface protonation constants of Na-montmorillonite (abbreviated as Namt) and Fe-pillared mont- Received 6 August 2015 morillonite (abbreviated as Femt) were obtained from experimental determination and then fitted with Received in revised form 11 October 2015 Protfit 2.1 software. The values of pK , pK and N as well as the iron content of Femt are higher than a1 a2 t Accepted 10 November 2015 those of Namt. The surface speciation of the sample presents lagging performance as the pH changes. The Available online 14 November 2015 adsorption amount and catalytic decolorization rate of Femt for rhodamine-B are higher than that of Namt at the same pH. When the pH value increases, the adsorption amount and catalytic decolorization rate Keywords: of Femt for rhodamine-B decline. The content of >FeOH on the surface of Femt is positively correlated Photo-Fenton-like with the adsorption amount and catalytic decolorization rate for the dye. The mechanism of >FeOH for Ionic dye the photocatalytic degradation of rhodamine-B may be interpreted as follows: after >FeOH effectively Surface speciation captures hydrogen peroxide and photoelectrons in the valence band of >FeOH , hydroxyl radicals are Quinoid structure 2 Electron capture produced. Hydroxyl radicals are also produced http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Surface Science Elsevier

Study on the surface speciation of Fe-pillared montmorillonite and mechanism of its photocatalytic effect on degradation of ionic dye rhodamine-B

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0169-4332
eISSN
1873-5584
D.O.I.
10.1016/j.apsusc.2015.11.102
Publisher site
See Article on Publisher Site

Abstract

Article history: The surface protonation constants of Na-montmorillonite (abbreviated as Namt) and Fe-pillared mont- Received 6 August 2015 morillonite (abbreviated as Femt) were obtained from experimental determination and then fitted with Received in revised form 11 October 2015 Protfit 2.1 software. The values of pK , pK and N as well as the iron content of Femt are higher than a1 a2 t Accepted 10 November 2015 those of Namt. The surface speciation of the sample presents lagging performance as the pH changes. The Available online 14 November 2015 adsorption amount and catalytic decolorization rate of Femt for rhodamine-B are higher than that of Namt at the same pH. When the pH value increases, the adsorption amount and catalytic decolorization rate Keywords: of Femt for rhodamine-B decline. The content of >FeOH on the surface of Femt is positively correlated Photo-Fenton-like with the adsorption amount and catalytic decolorization rate for the dye. The mechanism of >FeOH for Ionic dye the photocatalytic degradation of rhodamine-B may be interpreted as follows: after >FeOH effectively Surface speciation captures hydrogen peroxide and photoelectrons in the valence band of >FeOH , hydroxyl radicals are Quinoid structure 2 Electron capture produced. Hydroxyl radicals are also produced

Journal

Applied Surface ScienceElsevier

Published: Jan 1, 2016

References

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