| 1 | Enhanced Photocatalytic Activity in p-NiO Grafted n-TiO_2 Porous Coatings显示文摘We synthesized NiO-loaded TiO_2 porous p-n junctions by electrophoretic enhanced micro arc oxidation(EEMAO) technique which is a relatively simple and new method for producing composite coatings.Phase structure,chemical composition,and surface morphology of the NiO—TiO_2 coatings were investigated by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and scanning electron microscopy(SEM) techniques,respectively.Photocatalytic efficiency of the samples was studied through measuring the decomposition rate of 4-chlorophenol under UV irradiation.Results showed that the coatings mainly consisted of anatase,rutile,and nickel oxide phases.It was observed that a finer surface morphology,i.e.smaller pores,was obtained at lower voltages.Besides,the amount of nickel oxide loaded to the TiO_2 host increased with the voltage.The NiO-TiO_2 composite coatings showed a higher photoactivity than pure TiO_2 coatings revealing the effective role of NiO in decreasing the recombination rate of photogenerated electrons and holes.The maximum photocatalytic reaction rate constants for TiO_2and NiO—TiO_2 samples were obtained as 0.0064 and 0.0131 min^(-1),respectively.We also found that there was an optimum concentration of NiO where a maximum photocatalytic activity was achieved.A correlation between growth variables,structure,and photocatalytic efficiency was established. | S.Bassaki H.Niazi F.Golestani-Fard R.Naghizadeh R.Bayati | 2015 | Journal of Materials Science & Technology2015，31，4： | 4 |
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