Effect of water matrix on photocatalytic degradation and general kinetic modeling
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2016-01-01
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Abstract
Photocatalysis employing TiO2 nanoparticles was studied to assess the effect of aqueous matrix nature in the degradation of clofibric acid (CFA) under UV-A radiation. Aeroxide TiO2-P25 at 0.50 g/L was the most effective catalyst among those tested, with a CFA degradation of 98.5% after 15 min. The CFA photodegradation in environmental waters (tap, mineral, river and recycled wastewater) and in the presence of inorganic (NaCl, FeCl3, FeCl2, AlCl3, CaCl2, Al-2(SO4)(3), Fe-2(SO4)(3), Na2SO4, NaHCO3, and Na2CO3) and organic compounds (humic acids, and a surfactant) commonly found in real waters was compared to that obtained in pure water. In general, the removal efficiency decreased with inorganic salts, especially with sulfates and carbonates (>70% deactivation), and also in environmental waters (>90%). A general kinetic model has been developed to describe the CFA photo degradation depending on the type and concentration of substances present in water. The first-order kinetic constants were estimated by defining a characteristic parameter for each ion species tested in the aqueous matrix. High correlation (R-2 >0.99 in most cases) was observed between experimental CFA concentrations and those predicted by the model.
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Publisher Copyright: © 2015 Elsevier B.V.
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Clofibric acid photodegradation , Inorganic salts , Organic matter , Environmental water , Kinetic modeling , Clofibric acid photodegradation , Inorganic salts , Organic matter , Environmental water , Kinetic modeling , Catalysis , General Environmental Science , Process Chemistry and Technology , SDG 6 - Clean Water and Sanitation , SDG 12 - Responsible Consumption and Production , Funding Info , Association of Friends of the University of Navarra , Association of Friends of the University of Navarra
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RIOJA , NEREA , ZORITA , SAIOA & PEÑAS , FRANCISCO JAVIER 2016 , ' Effect of water matrix on photocatalytic degradation and general kinetic modeling ' , unknown , vol. unknown , pp. 330-335 . https://doi.org/10.1016/j.apcatb.2015.06.038