Formation Of Titania Nanotubes And Its Application In Reducing Cr(Vi)
Cr(VI) is a toxic heavy metal which has been classified as carcinogenic to humans. The industrial sources of Cr(VI) include alloy and steel manufacturing, metal finishing, and leather tanning. This study investigated the applicability of TiO2 nanotubes (TNTs) for the removal of Cr(VI) from aqueou...
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| Format: | Monograph |
| Language: | English |
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Universiti Sains Malaysia
2017
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| Online Access: | http://eprints.usm.my/52520/ http://eprints.usm.my/52520/1/Formation%20Of%20Titania%20Nanotubes%20And%20Its%20Application%20In%20Reducing%20Cr%28Vi%29%20_Intan%20Nur%20Izati%20%20Abdul%20Rahman_B1_2017.pdf |
| Summary: | Cr(VI) is a toxic heavy metal which has been classified as carcinogenic to humans. The
industrial sources of Cr(VI) include alloy and steel manufacturing, metal finishing, and
leather tanning. This study investigated the applicability of TiO2 nanotubes (TNTs) for
the removal of Cr(VI) from aqueous solution. The TNTs were synthesized by anodization
technique in three different electrolytes which are Ethylene Glycol/NH4F,
Glycerol/NH4F, and Na2SO4/NH4F at optimized times and voltages. The TNTs formation
were then characterized by Field Emission Scanning Electron Microscope (FESEM), XRay
Diffraction (XRD), Transmission Electron Microscope (TEM), and Fourier
Transform Infrared (FTIR). Two main parameters were investigated which were the
effects of anodization time and the effect of anodization voltage to the formation of TNTs
with similar length but with different diameter in different electrolytes. The optimum
sample defined by TNTs with length ~ 2 0.5 m were formed by anodization in
Ethylene Glycol/NH4F for 60V in 30 minutes, Glycerol/NH4F for 40V in 12 hours, and
Na2SO4/NH4F for 20V in 90 minutes. The samples were then being annealed at 400oC for
three hours in air to form crystalline structure of the TNTs and in N2 gas to get the Ndoped
TNTs. The annealed samples undergo XRD and FTIR characterization to confirm
the crystallinity of TNTs formed. Then, the optimized samples that were annealed in air
and N2 gas along with as anodized samples were tested for their photocatalytic ability
under sunlight and UV light for two hours. The photocatalytic results were obtained by
UV-VIS spectroscopy and the data of Ct/Co versus time were plotted. |
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