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A facile and efficient approach was first developed to prepare g-C 3 N 4 /TiO 2 nanocomposites by combining the arginine-enabled biomimetic mineralization of TiO 2 with the thermal oxidation etching of bulk g-C 3 N 4 . The resultant g-C 3 N 4 /TiO 2 nanocomposites exhibit a well-defined morphology, in which TiO 2 nanoparticles about 5.5 nm in diameter are uniformly distributed on the g-C 3 N 4 nanosheet. They exhibit higher degradation efficiency for Rhodamine B (RhB) than TiO 2 , g-C 3 N 4 and their mixture under visible light and simulated-sunlight irradiation. In all the as-prepared samples, the g-C 3 N 4 /TiO 2 nanosheet with 25.9 wt% of g-C 3 N 4 exhibits the highest photocatalytic efficiency, which can degrade almost all RhB under simulated-sunlight irradiation within 50 min. The synergistic effect between TiO 2 and g-C 3 N 4 plays an important role for the enhanced photocatalytic activity of g-C 3 N 4 /TiO 2 nanosheets. This kind of sheet-like nanocomposites may find the potential application for the photocatalytic degradation of organic pollutants. [ABSTRACT FROM AUTHOR]

Abstract: The alumina microfibers with mesoporous structure were synthesized by a facile hydrothermal and thermal decomposition route. The as-obtained products were well characterized by XRD, SEM, TEM (HRTEM), SAED and N2 adsorption–desorption measurement. It was shown that the length and diameter of these alumina microfibers are about 10μm and 300–500nm, respectively. All these alumina microfibers prepared by the PEG templates with different molecular weight have the different high surface area but nearly the same pore diameter about 3.5nm. The calcination experimental result shows that the mesoporosity of these alumina microfibers can be maintained even at 1373K. On the other hand, the higher selective catalytic reduction (SCR) of NO effectiveness present that the as-obtained mesoporous alumina have stronger adsorption property because of its high surface area. [Copyright &y& Elsevier]