In this work, a visible photocatalytic system containing Eosin Y, multiwalled carbon nanotubes and CuO was prepared. The photocatalytic hydrogen evolution from water over this system was studied using triethanolamine (TEA) as a sacrificial reagent. The results indicated that it was an efficient photocatalyst with an average rate of H2 evolution of 373 mmol·h-1·g-1 during first three hours under visible irradiation.
The pompon-like microspheres of AgIn5S8 with a cubic phase were prepared in a low temperature aqueous solution using mercaptoacetic acid as capping agent and thioacetamide as sulfur source and characterized with XRD, UV-vis absorption spectra, SEM and BET analysis. It is interesting that the microspheres are quite open and puffy. More importantly,the obtained microspheres showed remarkable photocatalytic activity for the degradation of methyl orange under visible light irradiation, which is probably due to the pompon-like morphology for providing reactive sites and facilitating the charge transfer between the target pollutant and the photocatalyst. This method could be extended to the synthesis of other functional micro/nano materials.
The visible-light photocatalytic activity of titanate nanotubes (TiNTs) sensitized by 5,10,15,20-tetraphenylporphyrin (TPP), 5,10,15,20-tetraphenylporphyrin manganese (MnTPP), 5,10,15,20-tetraphenylporphyrin nickel (NiTPP) and 5,10,15,20-tetraphenylporphyrin zinc (ZnTPP), respectively, was investigated by the photocatalytic degradation of methyl orange (MO) as a probe reaction. The results showed that the central ions of porphyrins had an important influence on the photocatalytic activity of the samples. The activity was in the order of TiNTs-ZnTPP > TiNTs-TPP > TiNTs-NiTPP > TiNTs-MnTPP. Combined the result of absorption spectra with that of fluorescence spectra, it was demonstrated that various visible-light absorption and photoelectron transfer caused by the central ions of porphyrins were the decisive factor for the visible-light photocatalytic activity of the sensitized TiNTs.
Core-shell montmorillonite-TiO2 colloids were prepared in a hydrothermal process and characterized with transmission electron microscope, powder X-ray diffraction analysis, Brunauer-Emmett-Teller analysis and UV-vis spectra. Afterwards, their photocatalytic activity was investigated under UV irradiation using methyl orange as a model contaminant. In addition, the stability of the core-shell montmorillonite-TiO2 colloids was investigated by repeatedly performing methyl orange photocatalytic degradation experiments. The results indicate the as-prepared core-shell montmorillonite-TiO2 colloids are a highly efficient photocatalyst for the degradation of organic dyes in water. And this photocatalytic activity remains almost unchanged after eight successive cycles.
A composite of AgIn5S8/AgInS2was prepared in aqueous solution by a simple low temperature process using mercaptoacetic acid as capping agent and thioacetamide as sulfur source. The composite was characterized by Xray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The obtained AgIn5S8/AgInS2composite showed high visible photocatalytic activity for the degradation of methyl orange with 97.5% of degradation efficiency of methyl orange under visible irradiation for 10 min. Under same conditions, furthermore, the AgIn5S8/AgInS2composite displayed better stability than that of pure AgIn5S8and AgInS2.
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