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Query: EC:3.4.16.2 (PCP)
 3,761 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The photocatalytic performance of sodium pentachlorophenate (PCP-Na) over NaBiO(3) under visible light irradiation was first investigated systematically. After 1h of photocatalytic reaction, the degradation rate of PCP-Na could reach to 90.5% in appropriate conditions. OH is the dominant photooxidant rather than O(2)(-) based on the experiment results and density of states (DOS) analysis. The PCP-Na solution became basic (pH value increased to approximately 9) with the progress of photocatalytic reaction which may be attributed to the PCP(-) oxidized to the pentachlorophenoxy radical by an attack on PCP(-) by OH. The photocatalytic reaction over NaBiO(3) follows the rule of first-order reaction according to the Langmuir-Hinshelwood model. The initial concentration of the PCP-Na, the initial pH value of PCP-Na aqueous solution and the amount of NaBiO(3) used have great influences on the photocatalytic performance. Three kinds of photocatalytic systems (P25, Bi(2)O(3) and P25-Bi(2)O(3) heterojunction) exhibited relative lower photocatalytic activity compared to NaBiO(3) powder.
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PMID:Rapid photocatalytic degradation of PCP-Na over NaBiO3 driven by visible light irradiation. 1915 Jul 48

A series of graphene-TiO2 photocatalysts was synthesized by doping TiO2 with graphene oxide via hydrothermal treatment. The photocatalytic capability of the catalysts under ultraviolet irradiation was evaluated in terms of sodium pentachlorophenol (PCP-Na) decomposition and mineralization. The structural and physicochemical properties of these nanocomposites were characterized by X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy, scanning electron microscopy, Ultraviolet-visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectra, and Fourier-transform infrared spectroscopy. The graphene-TiO2 nanocomposites exhibited higher photocatalytic efficiency than commercial P25 for the degradation of PCP-Na, and 63.4% to 82.9% of the total organic carbon was fully mineralized. The improved photocatalytic activity may be attributed to the accelerated interfacial electron-transfer process and the significantly prolonged lifetime of electron-hole pairs imparted by graphene sheets in the nanocomposites. However, excessive graphene and the inhomogeneous aggregation of TiO2 nanoparticles may decrease photodegradation efficiency.
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PMID:Graphene TiO2 nanocomposites with high photocatalytic activity for the degradation of sodium pentachlorophenol. 2528 56