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Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration

ZnO-incorporated mesostructured silica nanoparticles (MSN) catalysts (ZM) were prepared by the introduction of Zn ions into the framework of MSN via a simple electrochemical system in the presence of various concentrations of NH4OH aqueous solution. The physicochemical properties of the catalysts we...

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Main Authors: Jusoh, Norela W. C., Abdul Jalil, Aishah, Triwahyono, Sugeng, Karim, Ainul Hakimah, Salleh, Norashikin F. M., Rozali Annuar, Nur Hazirah, Jaafar, Nur Farhana, Firmansyah, M. L., Mukti, Rino R., Ali, Mohamad Wijayanuddin
Format: Article
Language:English
Published: Elsevier 2015
Subjects:
TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/56182/1/NorelaWCJusoh2015_StructuralRearrangementofMesostructuredSilicaNanoperticlesIncoroperated.pdf
http://eprints.utm.my/id/eprint/56182/
http://dx.doi.org/10.1016/j.apsusc.2014.12.192
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spelling my.utm.561822016-11-16T01:01:20Z http://eprints.utm.my/id/eprint/56182/ Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration Jusoh, Norela W. C. Abdul Jalil, Aishah Triwahyono, Sugeng Karim, Ainul Hakimah Salleh, Norashikin F. M. Rozali Annuar, Nur Hazirah Jaafar, Nur Farhana Firmansyah, M. L. Mukti, Rino R. Ali, Mohamad Wijayanuddin TP Chemical technology ZnO-incorporated mesostructured silica nanoparticles (MSN) catalysts (ZM) were prepared by the introduction of Zn ions into the framework of MSN via a simple electrochemical system in the presence of various concentrations of NH4OH aqueous solution. The physicochemical properties of the catalysts were studied by XRD, 29Si MAS NMR, nitrogen adsorption-desorption, FE-SEM, TEM, FTIR, and photoluminescence spectroscopy. Characterization results demonstrated that the alkaline aqueous electrolyte simply generated abundant silanol groups on the surface of the catalysts as a consequence of desilication to form the hierarchical-like structure of the MSN. Subsequent restructuring of the silica network by the creation of oxygen vacancies and formation of Si-O-Zn during the electrolysis, as well as formation of new Si-O-Si bonds during calcination seemed to be the main factors that enhanced the catalytic performance of photodecolorization of methyl orange. A ZM prepared in the presence of 1.0 M NH4OH (ZM-1.0) was determined to be the most effective catalyst. The catalyst displays a higher first-order kinetics rate of 3.87 × 10-1 h-1 than unsupported ZnO (1.13 × 10-1 h-1) that prepared under the same conditions in the absence of MSN. The experiment on effect of scavengers showed that hydroxyl radicals generated from the three main sources; reduced O2 at the conduction band, decomposed water at the valence band and irradiated H2O2 in the solution, are key factors that influenced the reaction. It is also noted that the recycled ZM-1.0 catalyst maintained its activity up to five runs without serious catalyst deactivation. Elsevier 2015-03-01 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/56182/1/NorelaWCJusoh2015_StructuralRearrangementofMesostructuredSilicaNanoperticlesIncoroperated.pdf Jusoh, Norela W. C. and Abdul Jalil, Aishah and Triwahyono, Sugeng and Karim, Ainul Hakimah and Salleh, Norashikin F. M. and Rozali Annuar, Nur Hazirah and Jaafar, Nur Farhana and Firmansyah, M. L. and Mukti, Rino R. and Ali, Mohamad Wijayanuddin (2015) Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration. Applied Surface Science, 330 . pp. 10-19. ISSN 0169-4332 http://dx.doi.org/10.1016/j.apsusc.2014.12.192 DOI:10.1016/j.apsusc.2014.12.192
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Jusoh, Norela W. C.
Abdul Jalil, Aishah
Triwahyono, Sugeng
Karim, Ainul Hakimah
Salleh, Norashikin F. M.
Rozali Annuar, Nur Hazirah
Jaafar, Nur Farhana
Firmansyah, M. L.
Mukti, Rino R.
Ali, Mohamad Wijayanuddin
Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration
description ZnO-incorporated mesostructured silica nanoparticles (MSN) catalysts (ZM) were prepared by the introduction of Zn ions into the framework of MSN via a simple electrochemical system in the presence of various concentrations of NH4OH aqueous solution. The physicochemical properties of the catalysts were studied by XRD, 29Si MAS NMR, nitrogen adsorption-desorption, FE-SEM, TEM, FTIR, and photoluminescence spectroscopy. Characterization results demonstrated that the alkaline aqueous electrolyte simply generated abundant silanol groups on the surface of the catalysts as a consequence of desilication to form the hierarchical-like structure of the MSN. Subsequent restructuring of the silica network by the creation of oxygen vacancies and formation of Si-O-Zn during the electrolysis, as well as formation of new Si-O-Si bonds during calcination seemed to be the main factors that enhanced the catalytic performance of photodecolorization of methyl orange. A ZM prepared in the presence of 1.0 M NH4OH (ZM-1.0) was determined to be the most effective catalyst. The catalyst displays a higher first-order kinetics rate of 3.87 × 10-1 h-1 than unsupported ZnO (1.13 × 10-1 h-1) that prepared under the same conditions in the absence of MSN. The experiment on effect of scavengers showed that hydroxyl radicals generated from the three main sources; reduced O2 at the conduction band, decomposed water at the valence band and irradiated H2O2 in the solution, are key factors that influenced the reaction. It is also noted that the recycled ZM-1.0 catalyst maintained its activity up to five runs without serious catalyst deactivation.
format Article
author Jusoh, Norela W. C.
Abdul Jalil, Aishah
Triwahyono, Sugeng
Karim, Ainul Hakimah
Salleh, Norashikin F. M.
Rozali Annuar, Nur Hazirah
Jaafar, Nur Farhana
Firmansyah, M. L.
Mukti, Rino R.
Ali, Mohamad Wijayanuddin
author_facet Jusoh, Norela W. C.
Abdul Jalil, Aishah
Triwahyono, Sugeng
Karim, Ainul Hakimah
Salleh, Norashikin F. M.
Rozali Annuar, Nur Hazirah
Jaafar, Nur Farhana
Firmansyah, M. L.
Mukti, Rino R.
Ali, Mohamad Wijayanuddin
author_sort Jusoh, Norela W. C.
title Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration
title_short Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration
title_full Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration
title_fullStr Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration
title_full_unstemmed Structural rearrangement of mesostructured silica nanoparticles incorporated with ZnO catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration
title_sort structural rearrangement of mesostructured silica nanoparticles incorporated with zno catalyst and its photoactivity: effect of alkaline aqueous electrolyte concentration
publisher Elsevier
publishDate 2015
url http://eprints.utm.my/id/eprint/56182/1/NorelaWCJusoh2015_StructuralRearrangementofMesostructuredSilicaNanoperticlesIncoroperated.pdf
http://eprints.utm.my/id/eprint/56182/
http://dx.doi.org/10.1016/j.apsusc.2014.12.192
_version_ 1643654019755802624
score 13.211869

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