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• W2014878006 abstract "Carbonate is a common pollutant in water and wastewater. A study to understand its influence on the photodegradation rates is necessary especially when TiO 2 /UV technique is emerging as an advanced technology for pollution abatement. In the present investigation, we report surface modification of titanium dioxide using carbonate ions, characterization of carbonate modified titanium dioxide (CMT) and photocatalytic application of carbonate modified TiO 2 . Titanium dioxide from two different sources namely BDH, Mumbai and Degussa AG, Germany was used as photocatalyst. The CMT catalysts were characterized using potentiometry, FT-IR and XPS. Approximately, 18.9 mg CO 3 /g CMT(BDH) and 8.13 mg CO 3 /g CMT(Degussa) was found loaded as determined by potentiometry. The C 1s and O 1s binding energies observed at 289.2 and 531.3 eV, respectively were attributed to surface carbonate species. The adsorption and photodegradation of Acid Blue I dye examined using neat TiO 2 as well as CMT catalysts revealed that carbonate inhibits catalytic activity for color and Chemical Oxygen Demand (COD) removal. The photo degradation rate constant ( k , s -1 ) decreases gradually with increasing concentration of carbonate. Thus, in the absence of carbonate k dye is 5.45 × 10 -4 s -1 (R 2 = 0.97) and k COD is 3.50 × 10 -5 s -1 (R 2 = 0.97). At 100 mg/L CO 3 2- , k dye is 0.16 × 10 -4 s -1 (R 2 = 0.96) and k COD is 2.66 × 10 -5 s -1 (R 2 = 0.98). In addition, the carbonate spiking studies revealed the onset of inhibition soon after the addition of carbonate into reacting suspensions of TiO 2 . The results suggest that carbonate inhibits catalytic activity through formation of strong surface complex under suitable pH by displacing OH 2 + and OH groups from TiO 2 surface. This results not only in fewer (OH) surface groups available for h + trapping for oxidation into OH radicals but also in non-availability of adsorption sites for the dye molecules. A pretreatment to remove carbonate from (waste) water appears necessary prior to application of TiO 2 /UV technique" @default.
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• W2014878006 date "2013-07-01" @default.
• W2014878006 modified "2023-09-27" @default.
• W2014878006 title "Preparation, Characterization and Photocatalytic Application of Carbonate Modified Titania" @default.
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• W2014878006 doi "https://doi.org/10.4028/www.scientific.net/msf.764.219" @default.
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