Synergistic adsorption and photocatalytic degradation of ciprofloxacin in aqueous medium using advanced g-C3N4/MoS2 heterostructures
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Methyl orange
Zinc nitrate
p–n junction
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Sulfadiazine(SD) was degraded by γ-radiation in an aqueous solution.The effects of initial concentrations of SD,pH values of solution,H2O2 and Fenton reagent on degradation of SD were investigated.Experimental results showed that SD can be effectively degraded by γ-irradiation in an aqueous solution.The degradation efficiencies of low-concentration SD can be remarkably improved in an acid solution.The degradation of SD was in accordance with the pseudo-first-order kinetic model.In addition,H2O2 can fairly promote degradation of SD induced by γ-radiation.Fenton reagent can markedly promote degradation of SD induced by γ-radiation.The degradation mechanism of SD was supposed by results of quantum chemical calculations and LC-MS.Degradation of SD induced by γ-radiation was mainly ascribed to OH oxidation.
Degradation
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Degradation
Visible spectrum
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This study prepared TiO2 film photocatalyst based on Ti plate using sol-gel method. XRD result demonstrated that the prepared photocatalyst mainly consisted of anatase crystals about 35.7nm on the average. SEM characterization result showed that the surface of the photocatalyst was very even and compact. And TiO2connected with the Ti plate closely and firmly. The photoelectrochemistry characteristic of the photocatalyst tested with electrochemistry method indicated that the prepared photocatalyst was n-type semiconductor and the extra electric field would promote the separation of photogenerated electron and hole in favor of the increase of the photocatalysis efficiency. The degradation experiments of benzamide by photocatalysis and electrically assisted photocatalysis (EAP) demonstrated that the extra electric field had the obvious assistant effect on photocatalysis and the benzamide degradation rate by EAP was much higher than that by photocatalysis. When the electrode potential of photocatalyst was -0.05V/SCE,the removal efficiency of benzamide could be 95% in 120min.
Benzamide
Degradation
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Redistribution
Settling
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Fe3+ and Al 3+ co-doped TiO2(Fe3+/Al3+-TiO2)composite photocatalysts were prepared by the sol-gel method using Ti(OC4H9)4 as precursor and characterized by X-ray diffraction(XRD)and UV-Vis.The effect of calcination temperature and salts in photocatalytic system on the photocatalytic activity of Fe3+/Al3+-TiO2 were investigated by photocatalytic degradation of methyl orange irradiated by sunlight.The photocatalytic activity of Fe3+/Al3+-TiO2 was enhanced with increasing temperature.HCO3-and NO2-decreased its photocatalytic activity.
Methyl orange
Degradation
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Underlayer exposed ZnO:Al-TiO2 coupled films are prepared by different means.Surface morphology by SEM,microstructure by XRD,film thickness by surface profiler and photocatalysis are investigated.In order to explain the enhanced photocatalysis,reaction Ag++→Ag↓ is adopted to clarify the mechanism.It turns out that during the process of photocatalysis the exposed part of the underlayer releases e-and this suppresses recombination of light-induced charges,thus enhanced photocatalysis.
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