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We investigated the sensitized degradation of humic acids on TiO 2 under visible light (λ>420nm) irradiation. The photolysis rates were strongly dependent on pH due to the pH-dependent adsorption of humic acids on TiO 2 with the maximum rate observed at pH~3. Reduction in the UV-visible absorbance and fluorescence emission (λ ex =350nm) of humic acids was observed during...
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