Search

The TiO2-mediated photocatalysis process has been successfully used for degrading dye pollutants during past decades. However, the dye degradation efficiency has been proposed to rely only on the concentration of oxygen molecules (through photooxidation pathway). In our current study, the dye ethyl violet (EV) degradation process is prepared under an anaerobic condition. Most interestingly, both photocatalytic reduction and photocatalytic oxidation intermediates are isolated and identified at the first time. Photoreduction intermediates such as benzene, toluene, ethylbenzene, and xylene (BTEX), ethane, and diethylamine are detected by Headspace-GC–MS. Moreover, 18 photodegraded intermediates are also identified and characterized through HPLC–PDA–ESI-MS. The results demonstrate that a novel photodegradation mechanism should be proposed via three competition pathways, including (i) the cleavage of the whole conjugated chromophore structure by photocatalytic reduction, (ii) the cleavage of the whole conjugated chromophore structure by photocatalytic oxidation, and (iii) N-de-ethylation of the chromophore skeleton. [ABSTRACT FROM AUTHOR]

A nano-crystalline In2O3 was synthesized using calcinations methods and was used as a photocatalyst to degrade sulfan blue (SB) dye. In addition, this study addresses the conditions of the degradation and the factors that influenced the catalysis. In2O3 was prepared by calcining In(OH)3 at heat ranges of 100-700 °C for 24 h. The In2O3 was characterized using field emission scanning electron microscopy (FE-SEM), an X-ray diffractometer (XRD), thermogravimetric analysis (TGA), and high-resolution X-ray photoelectron spectroscopy (HR-XPS). The activities of these samples were tested for the photocatalytic degradation of SB dye. The results indicated that the In(OH)3 that was calcined at 300 °C for 24 h had the best performance. [ABSTRACT FROM AUTHOR]

A nano-crystalline In2O3 was synthesized using calcinations methods and was used as a photocatalyst to degrade sulfan blue (SB) dye. In addition, this study addresses the conditions of the degradation and the factors that influenced the catalysis. In2O3 was prepared by calcining In(OH)3 at heat ranges of 100-700 °C for 24 h. The In2O3 was characterized using field emission scanning electron microscopy (FE-SEM), an X-ray diffractometer (XRD), thermogravimetric analysis (TGA), and high-resolution X-ray photoelectron spectroscopy (HR-XPS). The activities of these samples were tested for the photocatalytic degradation of SB dye. The results indicated that the In(OH)3 that was calcined at 300 °C for 24 h had the best performance. [ABSTRACT FROM AUTHOR]