Effect of activated carbon loading on the photocatalytic decolorization of methyl orange using activated carbon combined with nanotitania

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ID: 284979
2010
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Abstract
Colored wastewater is the major problem of textile industries. There are typical wastewater treatment processes available but they do not degrade dye molecules completely. Most of them just transfer the pollutant from one phase to another creating secondary pollution. In this study, photocatalytic decolorization of methyl orange (MO) using nanotitania supported by activated carbon (nanoTiO2/AC) was investigated. A support material was needed in order to aid in the adsorption of large dye molecules that eventually would lead to the photocatalytic degradation of the pollutant by activated nanoTiO2 using a UV light source. Sol-gel was the method used to synthesize nano-sized TiO2 as well as to its attachment to the support material which was AC. Improved surface area was achieved by producing nanoTiO2 and by adding AC. Moreover, the hydrolyzing agent used during the synthesis of the catalyst was glacial acetic acid (i.e. a weak acid). Its reaction with the titanium (IV) isopropoxide (i.e. TiO2 precursor) was so rapid that formation of linear polymers was promoted instead of forming bulk polymers. Bulk polymers form larger crystallite with smaller surface areas. The catalysts used in the study were 1:10, 2:10, and 3:10 AC-nanoTiO2. The ratios referred to the proportion of the amount of AC added in grams to the volume of sol in milliliters. In this case, the AC proportion was varied at a fixed volume of sol. The ratios were used in the optimization process, thus, the supported catalysts in the study were conveniently expressed as AC-nanoTiO2 instead of the conventional nanoTiO2/AC. In terms of percentage nanoTiO2, 1:10, 2:10, and 3:10 AC-nanoTiO2 corresponded to 3.6%, 5.4%, and 10.2% amount of theoretical nanoTiO2, respectively. The catalysts were subjected under several characterization techniques. The surface area of the catalysts was determined by Brunauer-Emmett-Teller (BET) analysis. The amount of AC loaded to the catalysts was determined by thernogravimetric analysis (TGA). Morphology and elemental composition was determined by scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS). The TiO2 crystallite size was estimated using high-resolution images generated using transmission electron microscopy (TEM). TiO2 crystallite phase and size were determined by X- ray powder diffraction (XRD). Lastly, organic functional groups present at the surface of the catalysts were determined by Fourier Transform Infrared (FT-IR). The increase in surface area of the catalysts was mainly due to the addition of AC. Bare nanoTiO2 only has 109.7 m2 /g as compared to 711.8, 837.2, and 851.1 m2 /g of 1:10,
Reference Key
persistent_1760654263_68f173b77fe23 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Cabral, Kerry P.
Journal Malay Journal
Year 2010
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etd_masteral/6140
Keywords Keywords not found

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