PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST
Photocatalytic degradation of a model azo dye, Orange II, was investigated over bimetallic Cu-Ni/Ti02 photocatalysts. In the present study the introduction of Cu and Ni onto Ti02 surface was with the intention to reduce the band gap of the photocatalyst for enhanced visible light absorption vi...
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oai:utpedia.utp.edu.my:212002024-07-24T01:38:01Z http://utpedia.utp.edu.my/id/eprint/21200/ PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST RIAZ, NADIA TP Chemical technology Photocatalytic degradation of a model azo dye, Orange II, was investigated over bimetallic Cu-Ni/Ti02 photocatalysts. In the present study the introduction of Cu and Ni onto Ti02 surface was with the intention to reduce the band gap of the photocatalyst for enhanced visible light absorption via three methods: co precipitation (CP), deposition-precipitation (DP) and wet impregnation (WI) methods with different Cu:Ni mass composition (10:0, 9:1,7:3,5:5,3:7, I :9 and 0:10). The physical and chemical properties of the modified Cu-Ni doped photocatalysts were investigated using Thermogravimetric Analysis (TGA), Fourier-Transformed Infrared Spectroscopy (FTIR), Point of Zero Charge (PZC) determination, powder X-ray Diffraction (XRD), BET surface area analysis, Field-emission Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (FESEM-EDX), High Resolution Transmission Electron Microscopy (HRTEM), Diffuse Reflectance UV�Vis Spectroscopy (DRUV-Vis) and Temperature-programmed Reduction (TPR). The raw photocatalysts were activated by calcination at three different temperatures (180°C, 200°C and 300°C) for I h duration. The PZC of Cu-Ni/Ti02 photocatalyst shifts to a more basic value compared to the bare Ti02 (3.8). Photocatalyst particles were spherical with slight agglomeration and high metal dispersion was achieved confirmed by XRD and FESEM-EDX analyses. The presence of Cu-Ni mixed oxide was detected by TPR analysis. The surface area of Cu-Ni/TiOz photocatalysts was higher compared to that of bare TiOz. Incorporation of Cu, Ni, and Cu-Ni onto Ti02 resulted in the shift of absorption spectra into visible region with reduced bandgap energy (2.74 eV) as confirmed by DRUV-Vis spectroscopy. The synthesized Cu�Ni/Ti02 photocatalysts were screened for Orange II decoloration efficiency against different reaction parameters. The parameters studied were the effect of different photocatalysts preparation methods, calcination temperature, Cu:Ni mass composition, initial pH, metal loading, photocatalyst loading, initial dye concentration and oxygen bubbling. 2013-11 Thesis NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/id/eprint/21200/1/2012%20-CHEMICAL%20-%20PREPARATION%2C%20CHARACTERIZATION%20%26%20ORANGE%20II%20REMOVAL%20UNDER%20VISIBLE%20LIGHT%20RADIATION%20OF%20Cu-Ni%20OR%20TiO2%20PHOTOCATALYST%20-%20NADIA%20RIAZ.pdf RIAZ, NADIA (2013) PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST. Doctoral thesis, Universiti Teknologi PETRONAS. |
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TP Chemical technology RIAZ, NADIA PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST |
description |
Photocatalytic degradation of a model azo dye, Orange II, was investigated over
bimetallic Cu-Ni/Ti02 photocatalysts. In the present study the introduction of Cu and
Ni onto Ti02 surface was with the intention to reduce the band gap of the
photocatalyst for enhanced visible light absorption via three methods: co precipitation
(CP), deposition-precipitation (DP) and wet impregnation (WI) methods with
different Cu:Ni mass composition (10:0, 9:1,7:3,5:5,3:7, I :9 and 0:10). The physical
and chemical properties of the modified Cu-Ni doped photocatalysts were
investigated using Thermogravimetric Analysis (TGA), Fourier-Transformed Infrared
Spectroscopy (FTIR), Point of Zero Charge (PZC) determination, powder X-ray
Diffraction (XRD), BET surface area analysis, Field-emission Scanning Electron
Microscopy-Energy Dispersive X-Ray Spectroscopy (FESEM-EDX), High
Resolution Transmission Electron Microscopy (HRTEM), Diffuse Reflectance UV�Vis Spectroscopy (DRUV-Vis) and Temperature-programmed Reduction (TPR). The
raw photocatalysts were activated by calcination at three different temperatures
(180°C, 200°C and 300°C) for I h duration. The PZC of Cu-Ni/Ti02 photocatalyst
shifts to a more basic value compared to the bare Ti02 (3.8). Photocatalyst particles
were spherical with slight agglomeration and high metal dispersion was achieved
confirmed by XRD and FESEM-EDX analyses. The presence of Cu-Ni mixed oxide
was detected by TPR analysis. The surface area of Cu-Ni/TiOz photocatalysts was
higher compared to that of bare TiOz. Incorporation of Cu, Ni, and Cu-Ni onto Ti02
resulted in the shift of absorption spectra into visible region with reduced bandgap
energy (2.74 eV) as confirmed by DRUV-Vis spectroscopy. The synthesized Cu�Ni/Ti02 photocatalysts were screened for Orange II decoloration efficiency against
different reaction parameters. The parameters studied were the effect of different
photocatalysts preparation methods, calcination temperature, Cu:Ni mass
composition, initial pH, metal loading, photocatalyst loading, initial dye concentration
and oxygen bubbling. |
format |
Thesis |
author |
RIAZ, NADIA |
author_facet |
RIAZ, NADIA |
author_sort |
RIAZ, NADIA |
title |
PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST |
title_short |
PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST |
title_full |
PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST |
title_fullStr |
PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST |
title_full_unstemmed |
PREPARATION, CHARACTERIZATION AND ORANGE II REMOVAL UNDER VISIBLE LIGHT RADIATION OF Cu-Ni/Ti02 PHOTOCATALYST |
title_sort |
preparation, characterization and orange ii removal under visible light radiation of cu-ni/ti02 photocatalyst |
publishDate |
2013 |
url |
http://utpedia.utp.edu.my/id/eprint/21200/1/2012%20-CHEMICAL%20-%20PREPARATION%2C%20CHARACTERIZATION%20%26%20ORANGE%20II%20REMOVAL%20UNDER%20VISIBLE%20LIGHT%20RADIATION%20OF%20Cu-Ni%20OR%20TiO2%20PHOTOCATALYST%20-%20NADIA%20RIAZ.pdf http://utpedia.utp.edu.my/id/eprint/21200/ |
_version_ |
1805891020723847168 |
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13.214268 |