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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 699Effect of Silicon Oxide Size and Reducing...

Effect of Silicon Oxide Size and Reducing Environment on the Photocatalytic Capability of Poly(Vinyl Alcohol)/Chitosan/Silicon Oxide Beads

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Abstract:

The present work assess the capability of silicon oxide (SiO₂) nanoparticle and microparticle incorporated in poly (vinyl alcohol)/chitosan/silicon oxide (PVA/CS/SiO₂) beads to reduce chromium (Cr) ions of Cr (VI) to Cr (III). PVA/CS/(nanoand micro)-SiO₂ beads were prepared through a simple drop wise method. The elemental analysis of prepared photocatalytic beads were confirmed by scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX) and morphology of PVA/CS/SiO₂ beads before and after Cr ions reduction were observed with SEM. The reduction of chromium (Cr (VI)) ions by both of PVA/CS/(nanoand micro)-SiO₂) beads, as evaluated by the reduction duration taken were studied by photocatalytic process in which factors of SiO₂ powders size and pH of reducing environment were varied. Photocatalytic studies revealed better performance of PVA/CS/nanoSiO₂ beads in compared to PVA/CS/micro-SiO₂ beads in Cr (VI) to Cr (III) ions reduction. Reduction Cr (VI) to Cr (III) ions by PVA/CS/nanoSiO₂ beads occurred in 30 minutes and 50 minutes by PVA/CS/micro-SiO₂. Moreover, both PVA/CS/(nanoand micro)-SiO₂ showed excellent reduction of Cr (VI) ions at lower pH environment. It is thus concluded that both of PVA/CS/(nanoand micro)-SiO₂ beads are capable for chromium reduction in highly acidic environment in which PVA/CS/nanoSiO₂ beads showed better performance.

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Periodical:

Applied Mechanics and Materials (Volume 699)

Pages:

1000-1005

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.699.1000

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Online since:

November 2014

Authors:

Syazwan Liyana Sulaiman*, Sufizar Ahmad, Hariati Taib

Keywords:

Acidic Environment, Chromium, Photocatalytic, PVA/CS/SiO₂ Beads, Reduction

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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