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Isomorphous substitution of Fe in the framework of aluminosilicate MFI by hydrothermal synthesis and their evaluation in p-nitrophenol degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
27967 44053 2009 7 PDF Available
Title
Isomorphous substitution of Fe in the framework of aluminosilicate MFI by hydrothermal synthesis and their evaluation in p-nitrophenol degradation
Abstract

Raw rise husks (white particles) were used to produce silica through submission to consecutive chemical treatment using NaOH and HCl solutions. The prepared silica was well incorporated with other components under hydrothermal conditions to synthesize ZSM-5. Fe framework-substituted ZSM-5 with constant Si/(Fe + Al) ratios have been synthesized hydrothermally and characterized by physicochemical methods, e.g. X-ray diffraction (XRD), FI-IR, UV–vis spectroscopy and N2 adsorption. IR spectroscopy of Fe-substituted ZSM-5 shows a new band at 656 cm−1 due to Si–O–Fe group supporting framework incorporation. The replacement of Al3+ by Fe3+ causes a shift of Si–O–T vibration to lower wavenumbers. The presence of tetrahedral Fe3+ has been confirmed by XRD and UV–vis spectroscopy. The photocatalytic activity of Fe incorporated ZSM-5 zeolite towards degradation of p-nitrophenol (PNP) was well investigated at the atmospheric pressure, 25 °C, with H2O2 as an oxidizing agent. The enhanced photocatalytic activity of 0.4FeZ is attributed to charge-transfer excited complex between Fe in zeolite along with PNP ligand in addition to higher surface area and high dispersion Fe in framework comparatively. More information on local structures of metal oxides inside zeolites and their photocatalytic activities towards PNP were deduced, correlated and discussed.

Keywords
ZSM-5; TPABr template; Rice husk ash; Fe-ZSM-5; p-Nitrophenol; Characterization; XRD; FT-IR; Surface texturing
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Isomorphous substitution of Fe in the framework of aluminosilicate MFI by hydrothermal synthesis and their evaluation in p-nitrophenol degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 204, Issue 1, 30 April 2009, Pages 25–31
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us