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
Applied Surface Science – Elsevier
Published: Jan 1, 2016
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