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摘要
In this study, TiO2 photocatalyst was synthesized by the sol-gel method, and doped with neodymium(II) nitrate hexahydrate (Nd) to increase its photocatalytic activity for the decomposition of methylene blue (MB) as a pollutant. The Nd-TiO2 photocatalyst was coated on glass using the dip coating method. The photocatalyst was characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR) techniques. The concentration of MB was investigated by UV-VIS spectrophotometer, and photodegradation products were analyzed by liquid chromatography coupled to mass spectrometry (LC/MS) technique. To achieve optimum experimental parameters, an experimental methodology design was used based on Taguchi (L9). The effect of various parameters, such as pH of the solution, Nd dosage, initial concentration of MB and UV light intensity, were investigated. The effects were studied using signal-to-noise (SIN) ratio and analysis of variance (ANOVA). The results showed that the efficiency of MB photodegradation after irradiation for 60 min was about 88% under optimum conditions (pH 7, initial concentration of MB 1.5 mg L-1, Nd dosage 0.2% and UV light irradiation 45 W).
- 出版日期2013
