Topic
Photocatalysis
About: Photocatalysis is a research topic. Over the lifetime, 67088 publications have been published within this topic receiving 2145233 citations. The topic is also known as: photocatalyst.
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TL;DR: In this article, a novel hydrothermal approach is developed for the first time to synthesize hierarchical BiVO4/Bi2O2CO3 nanocomposites with reactive crystalline facets using urea as a morphology mediator.
Abstract: A novel hydrothermal approach is developed for the first time to synthesize hierarchical BiVO4/Bi2O2CO3 nanocomposites with reactive crystalline facets using urea as a morphology mediator. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, N2 absorption–desorption isotherms and UV–visible diffuse reflectance spectroscopy. The photocatalytic activity of the as-prepared samples was evaluated towards degradation of Rhodomine B (RhB) by visible-light. Our results indicate that both physical parameters and associated photocatalytic activity of BiVO4/Bi2O2CO3 nanocomposites can be tuned by urea concentration and reaction time in the synthesis process. With increasing urea concentration, the specific surface area, pore volume and average pore size increase. Compared to BiVO4 and Bi2O2CO3 bulk counterpart, BiVO4/Bi2O2CO3 nanocomposites show enhanced photocatalytic degradation activity of RhB. The mechanisms for the formation of BiVO4/Bi2O2CO3 nanocomposites and enhanced photoreactivity are discussed.
396 citations
TL;DR: In this article, the nanosized rhombic dodecahedral ZIF-67 crystals were successfully synthesized through a simple co-precipitation method at room temperature, and fully characterized by XRD, FT-IR, DRS, XPS, TEM, SEM, TGA and N 2 /CO 2 sorption measurements.
Abstract: The nanomorphology of ZIFs strongly influences or even improves chemical properties of the metal-organic materials. Nanosized rhombic dodecahedral ZIF-67 crystals were successfully synthesized through a simple co-precipitation method at room temperature, and fully characterized by XRD, FT-IR, DRS, XPS, TEM, SEM, TGA and N 2 /CO 2 sorption measurements. The as-prepared ZIF-67 material was applied to be an efficient heterogeneous co-catalyst for the photocatalytic CO 2 reduction by cooperating with a ruthenium-based dye as a photosensitizer under mild reaction conditions. Under the optimal reaction conditions, the photocatalytic CO 2 reduction system achieved a superior catalytic performance with a CO generation rate of 37.4 μmol/30 min, which was much higher than that of other types of MOFs. The carbon source of the evaluated CO was confirmed by 13 CO 2 isotopic experiment. The stability and reusability of the ZIF-67 co-catalyst in the reaction system were also examined. The present work provides new insights in the developments of nanoscale ZIFs materials for photocatalytic application.
395 citations
TL;DR: In this article, a PANI-hybridized zinc oxide (ZnO)-polyaniline (PANI) was used for the degradation of the methylene blue (MB) under ultraviolet and visible light irradiation.
Abstract: Monomolecular-layer polyaniline (PANI) was dispersed on the surface of zinc oxide (ZnO) and formed the hybrid effect between ZnO and PANI. The hybrid photocatalysts showed dramatic photocatalytic activity for the degradation of the methylene blue (MB) both under ultraviolet and visible light irradiation, and the photocorrosion of ZnO was successfully inhibited. The enhanced photocatalytic activity for PANI-hybridized ZnO originated from the high separation efficiency of photogenerated electrons and holes on the interface of PANI and ZnO, which was produced by the hybrid effect of PANI and ZnO. The photocorrosion inhibition of ZnO could be attributed to the rapidly transferring of photogenerated holes by the PANI monolayer. The relationship between the PANI content of the samples and their photocatalytic performance shows that an optimal PANI weight percent (1.0%) can significantly enhance the photocatalytic efficiency and anticorrosion of ZnO particles. In particular, the mechanisms on the enhancement of ...
395 citations
TL;DR: In this paper, the photocatalytic activity of pure anatase nanoparticles, of anatase/brookite mixtures, and of pure brookite nanorods has been assessed by hydrogen evolution from aqueous methanol solution as well as by the degradation of dichloroacetic acid (DCA) in an in situ OH− source.
Abstract: High quality brookite TiO2 nanorods have been obtained by the thermal hydrolysis of commercially available aqueous solutions of titanium bis(ammonium lactate) dihydroxide in the presence of high concentrations of urea (≥6.0 M) as an in situ OH− source. Biphasial anatase/brookite mixtures are obtained at lower urea concentrations. The ratios between anatase and brookite can readily be tailored by the control of the urea concentration. The obtained powders have been characterized by X-ray diffraction, Raman spectroscopy, field emission-scanning electron microscopy, high-resolution transmission electron microscopy, UV−vis diffuse reflectance spectra, and nitrogen adsorption. The photocatalytic activity of pure anatase nanoparticles, of anatase/brookite mixtures, and of pure brookite nanorods has been assessed by hydrogen evolution from aqueous methanol solution as well as by the degradation of dichloroacetic acid (DCA) in aqueous solution. The results indicate that the photocatalytic hydrogen evolution activ...
393 citations
TL;DR: In this article, a colloidal blending method was used for the preparation of TiO2/graphene oxide composites, which achieved superior adsorption and photocatalysis performance under both UV and visible radiation.
392 citations