Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route

In this study, visible-light driven photocatalyst BiVO4 was synthesized via polyol route. The effect of calcination temperature and duration on the characteristics of the resulting BiVO4 catalyst was studied by performing Thermogravimetric Analysis (TGA), X-ray Diffraction (XRD), Field Emission Scan...

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Main Author:	Moey, Melanie Hui Jia
Format:	Thesis
Language:	English
Published:	2012
Subjects:	Photocatalysis Methylene blue Polyols
Online Access:	http://psasir.upm.edu.my/id/eprint/31402/1/FS%202012%2070R.pdf
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spelling	my-upm-ir.314022015-02-10T01:46:44Z Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route 2012-12 Moey, Melanie Hui Jia In this study, visible-light driven photocatalyst BiVO4 was synthesized via polyol route. The effect of calcination temperature and duration on the characteristics of the resulting BiVO4 catalyst was studied by performing Thermogravimetric Analysis (TGA), X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), surface area measurement (BET method) and Diffuse Reflectance Spectroscopy (DRS). XRD analysis showed that monoclinic scheelite BiVO4 can be obtained by calcining the sample at 450 °C for 3 hours. The BiVO4 produced was olive-like in shape. The morphology of synthesized BiVO4 retained the same upon increasing the calcination temperature and duration. However, its surface area decreased and showed increment in its particle size when calcination temperature and duration increased. Calcination temperature and duration did not affect the band gap energy of the BiVO4 catalyst. The efficiency of resulted BiVO4 as a visible-light driven photocatalyst was examined by removing Methylene Blue (MB) dye from aqueous solution. The effect of operational parameters such as catalyst dosage, initial concentration of dye and initial pH of solution on the removal of MB was also studied. The removal percentage of MB increased with increasing mass up to an optimum mass of 0.6003 g. Rate of reaction increased with increasing initial concentration of MB. Highest removal percentage of MB was also achieved at its natural state of pH. Further, experimental design methodology was used for response surface modelling and optimisation of MB removal. A multivariate experimental design was employed to investigate its interaction relationship among catalyst loading, initial concentration of dye and initial pH of solution. The maximum removal percentage of MB approached 67.21 % under optimised conditions of 0.57 g BiVO4, 10.47 ppm of MB and at pH 4.7. A satisfactory goodness-of-fit was achieved between the predictive and the experimental results which indicates response surface methodology is a reliable tool for optimising removal percentage of MB. Photocatalysis Methylene blue Polyols 2012-12 Thesis http://psasir.upm.edu.my/id/eprint/31402/ http://psasir.upm.edu.my/id/eprint/31402/1/FS%202012%2070R.pdf application/pdf en public masters Universiti Putra Malaysia Photocatalysis Methylene blue Polyols Faculty of Science
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Photocatalysis Methylene blue Polyols
spellingShingle	Photocatalysis Methylene blue Polyols Moey, Melanie Hui Jia Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route
description	In this study, visible-light driven photocatalyst BiVO4 was synthesized via polyol route. The effect of calcination temperature and duration on the characteristics of the resulting BiVO4 catalyst was studied by performing Thermogravimetric Analysis (TGA), X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), surface area measurement (BET method) and Diffuse Reflectance Spectroscopy (DRS). XRD analysis showed that monoclinic scheelite BiVO4 can be obtained by calcining the sample at 450 °C for 3 hours. The BiVO4 produced was olive-like in shape. The morphology of synthesized BiVO4 retained the same upon increasing the calcination temperature and duration. However, its surface area decreased and showed increment in its particle size when calcination temperature and duration increased. Calcination temperature and duration did not affect the band gap energy of the BiVO4 catalyst. The efficiency of resulted BiVO4 as a visible-light driven photocatalyst was examined by removing Methylene Blue (MB) dye from aqueous solution. The effect of operational parameters such as catalyst dosage, initial concentration of dye and initial pH of solution on the removal of MB was also studied. The removal percentage of MB increased with increasing mass up to an optimum mass of 0.6003 g. Rate of reaction increased with increasing initial concentration of MB. Highest removal percentage of MB was also achieved at its natural state of pH. Further, experimental design methodology was used for response surface modelling and optimisation of MB removal. A multivariate experimental design was employed to investigate its interaction relationship among catalyst loading, initial concentration of dye and initial pH of solution. The maximum removal percentage of MB approached 67.21 % under optimised conditions of 0.57 g BiVO4, 10.47 ppm of MB and at pH 4.7. A satisfactory goodness-of-fit was achieved between the predictive and the experimental results which indicates response surface methodology is a reliable tool for optimising removal percentage of MB.
format	Thesis
qualification_level	Master's degree
author	Moey, Melanie Hui Jia
author_facet	Moey, Melanie Hui Jia
author_sort	Moey, Melanie Hui Jia
title	Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route
title_short	Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route
title_full	Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route
title_fullStr	Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route
title_full_unstemmed	Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route
title_sort	photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2012
url	http://psasir.upm.edu.my/id/eprint/31402/1/FS%202012%2070R.pdf
_version_	1747811609568346112

Photocatalytic removal of methylene blue by bismuth vanadate prepared via polyol route

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