Zeolitic wood structures made by a seeded templating process offer new ways of investigating the complex wood morphology. The technique can also be used to create hierarchical porous zeolitic materials (see Figure). The seeded growth strategy shows potential for the extension to any organisms with hierarchical structure and might make multilevel porous zeolites of other types feasible.
Enhancement of full-spectrum photocatalytic activity over BiPO4/Bi2WO6 composites, Applied Catalysis B, Environmental http://dx.Highlights 9 BiPO4/Bi2WO6 composite photocatalysts were prepared via ultrasonic-calcination method. 10 BiPO4/Bi2WO6 composites had superior photocatalytic performance under full-spectrum 11 condition. 12 The enhancement mechanism of photocatalytic activity over BiPO4/Bi2WO6 was 13 systematically investigated. 14 *Graphical Abstract 15 2 16 17 3 Abstract: The full-spectrum photocatalytst is of important value for the practical use, which 18 could absorb natural sunlight for photoctalytic degrading organic pollutants. BiPO4/Bi2WO6 19 composite photocatalysts were prepared via ultrasonic-calcination method and had superior 20 photocatalytic performance for degrading different kinds of organic pollutants under simulant 21 sunlight irradiation. The apparent rate constant of 5.0%BiPO4/Bi2WO6 on the degradation of 22 methylene blue (MB) is 0.0305 min -1 , which is about 25.4 and 3.2 times of pure BiPO4 and 23 Bi2WO6 respectively. In the BiPO4/Bi2WO6 composite photocatalysts, the core-hole structure 24 of BiPO4 as core and Bi2WO6 as hole was formed. During the photocatalytic process of 25 BiPO4/Bi2WO6 composites under simulant sunlight irradiation, the photo-generated electrons 26 of BiPO4 would inject to the conduction band of Bi2WO6, and the photo-generated holes on 27 Bi2WO6 could transfer to the valance band of BiPO4, and then an effective charges separation 28 was achieved. The interaction of BiPO4 and Bi2WO6 not only expanded the range of absorption 29 spectrum but also enhanced the separation efficiency of photo-generated charges, and further 30 improved the photocatalytic performance.31
Zeolite fibers have attracted growing interest for a range of new applications because of their structural particularity while maintaining the intrinsic performances of the building blocks of zeolites. The fabrication of uniform zeolite fibers with tunable hierarchical porosity and further exploration of their catalytic potential are of great importance. Here, we present a versatile and facile method for the fabrication of hierarchical ZSM-5 zeolite fibers with macro-meso-microporosity by coaxial electrospinning. Due to the synergistic integration of the suitable acidity and the hierarchical porosity, high yield of propylene and excellent anti-coking stability were demonstrated on the as-prepared ZSM-5 hollow fibers in the catalytic cracking reaction of iso-butane. This work may also provide good model catalysts with uniform wall thickness and tunable porosity for studying a series of important catalytic reactions.
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