Electrochemical enhancement of solar photocatalysis: degradation of endocrine disruptor bisphenol-A on Ti/TiO2 films. 2011

Zacharias Frontistis, and Vasileia M Daskalaki, and Alexandros Katsaounis, and Ioannis Poulios, and Dionissios Mantzavinos
Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, Chania, Greece.

The photoelectrocatalytic oxidation over immobilized Ti/TiO(2) films in the presence of simulated solar light was investigated for the degradation of bisphenol-A (BPA) in water. The catalyst, consisting of 75:25 anatase:rutile, was prepared by a sol-gel method and characterized by cyclic voltammetry, X-ray diffraction and scanning electron microscopy. Experiments were conducted to assess the effect of applied current (0.02-0.32 mA/cm(2)), TiO(2) loading (1.3-9.2 mg), BPA concentration (120-820 μg/L), initial solution pH (1 and 7.5) and the aqueous matrix (pure water and treated effluent) on BPA photoelectrocatalytic degradation which was monitored by high performance liquid chromatography equipped with a fluorescence detector. The reaction was favored at anodic currents up to 0.04 mA/cm(2) and lower substrate concentrations, but it was hindered by the presence of residual organic matter and radical scavengers (e.g. bicarbonates) in treated effluents. Moreover, a pseudo-first order kinetic model could fit the experimental data well with the apparent reaction constant taking values between 2.9 and 32.4 10(-3)/min. The degradation of BPA by pure photocatalysis or electrochemical oxidation alone was also studied leading to partial substrate removal. In all cases, the contribution of applied potential to photocatalytic degradation was synergistic with the photocatalytic efficiency increasing between 24% and 97% possibly due to a more efficient separation and utilization of the photogenerated charge carriers. The effect of photoelectrocatalysis on the ecotoxic and estrogenic properties of BPA was also evaluated measuring the bioluminescence inhibition of Vibrio fischeri and performing the yeast estrogen screening assay, respectively.

UI MeSH Term Description Entries
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D010636 Phenols Benzene derivatives that include one or more hydroxyl groups attached to the ring structure.
D001559 Benzhydryl Compounds Compounds which contain the methyl radical substituted with two benzene rings. Permitted are any substituents, but ring fusion to any of the benzene rings is not allowed. Diphenylmethyl Compounds,Compounds, Benzhydryl,Compounds, Diphenylmethyl
D014025 Titanium A dark-gray, metallic element of widespread distribution but occurring in small amounts with atomic number, 22, atomic weight, 47.867 and symbol, Ti; specific gravity, 4.5; used for fixation of fractures.
D014865 Waste Disposal, Fluid The discarding or destroying of liquid waste products or their transformation into something useful or innocuous. Disposal, Fluid Waste,Disposals, Fluid Waste,Fluid Waste Disposal,Fluid Waste Disposals,Waste Disposals, Fluid
D014874 Water Pollutants, Chemical Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water. Chemical Water Pollutants,Landfill Leachate,Leachate, Landfill,Pollutants, Chemical Water
D048908 Aliivibrio fischeri A species of gram-negative bacteria in the genus ALIIVIBRIO, which exhibits LUMINESCENCE. A. fischeri is found in a symbiotic relationship with the SQUID Euprymna scolopes. Achromobacter fischeri,Bacillus fischeri,Bacillus phosphorescens indigenus,Einheimischer Leuchtbacillus,Microspira fischeri,Microspira marina,Photobacterium fischeri,Vibrio fischeri,Vibrio noctiluca
D052244 Endocrine Disruptors Exogenous agents, synthetic and naturally occurring, which are capable of disrupting the functions of the ENDOCRINE SYSTEM including the maintenance of HOMEOSTASIS and the regulation of developmental processes. Endocrine disruptors are compounds that can mimic HORMONES, or enhance or block the binding of hormones to their receptors, or otherwise lead to activating or inhibiting the endocrine signaling pathways and hormone metabolism. Endocrine Disrupting Chemical,Endocrine Disrupting Chemicals,Endocrine Disruptor,Endocrine Disruptor Effect,Endocrine Disruptor Effects,Chemical, Endocrine Disrupting,Chemicals, Endocrine Disrupting,Disrupting Chemical, Endocrine,Disruptor Effect, Endocrine,Disruptor Effects, Endocrine,Disruptor, Endocrine,Disruptors, Endocrine,Effect, Endocrine Disruptor,Effects, Endocrine Disruptor
D055668 Photochemical Processes Chemical reactions effected by light. Processes, Photochemical

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