High Surface Area Iron Oxide Microspheres via Ultrasonic Spray Pyrolysis of Ferritin Core Analogues

Overcash, John W.; Suslick, Kenneth S.

doi:10.1021/acs.chemmater.5b00766

Cited by 22 publications

(11 citation statements)

References 63 publications

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“…The close-up view of ZWO-700 ( Figure 2d) indicates that the as prepared ZnWO4 possess pores and cavities on the surface of the spheres. This morphology was probably the result of rapid solvent evaporation at high pyrolyzing temperatures and subsequent shell cracking [30].…”

Section: Phase Structure and Morphologymentioning

confidence: 99%

“…Compared with other conventional methods for fabrication of porous structured catalysts, USP is a template-free method which can produce products with high purity. Most recently, Overcash and coworkers reported the fabrication of high surface area iron oxide microspheres of different morphologies, sizes, and crystallinities via USP method [30]. Wolframite ZnWO4, however, has not been previously prepared with hierarchical porous structure through USP method.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Huang

Gao

Zhang

et al. 2016

Applied Catalysis A: General

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Solar-light-driven photocatalysts with porous structure are preferred for gaseous pollutants removal at low concentration levels. In this study, hierarchical porous ZnWO4 microspheres were synthesized by a facile ultrasonic spray pyrolysis method for the first time. The as-prepared ZnWO4 samples were composed of microspheres with diameter ranging from 0.1 to 2 μm and it was revealed that these microspheres are formed by the self-assembly of nanoparticles. The photocatalytic performances of these microspheres were evaluated by the degradation of gaseous NOx under simulated solar light irradiation. It was found that the ZnWO4 batch synthesized at 700 °C exhibited superior photocatalytic activity to those synthesized at 650 °C and 750 °C as well as Degussa TiO2 P25. Both •OH and O2•radicals were found to be the major reactive species involved for NOx degradation as identified by electron spin resonance spectroscopy (ESR) method, which was consistent with the theoretical analysis. The excellent catalytic activity of ZWO-700 was attributed to its special hierarchical porous structure, which facilitated the separation/diffusion of the photogenerated charge carriers and the diffusion of intermediates and final products of NOx oxidation. The photocatalytic NOx removal mechanism over ZnWO4 samples was also proposed. This study suggests that ultrasonic spray pyrolysis is a facile and scalable process to fabricate ZnWO4 porous microspheres which are promising photocatalytic materials for gaseous pollutants purification.

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Section: Phase Structure and Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Huang

Gao

Zhang

et al. 2016

Applied Catalysis A: General

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“…A distinctive feature of the method is that it can produce porous microspheres of various compositions without template and with good phase purity, and the morphology can be easily controlled during the process to ensure homogeneous composition distribution in the spheres [52,53]. In this approach of ultrasonic spray pyrolysis, Suslick et al [54] synthesized BiVO 4 powders with particles ranging from thin, hollow and porous shells to ball-in-balltype structures.…”

Section: Ultrasonic Spray Pyrolysis For the Preparation Of Photocatalmentioning

confidence: 99%

Synthesis of Photoactive Materials by Sonication: Application in Photocatalysis and Solar Cells

Colmenares

Kuna

Lisowski

2016

Topics in Current Chemistry Collections

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In recent years, a good number of methods have become available for the preparation of an important group of photoactive materials for applications in photocatalysis and solar cells. Nevertheless, the benefits derived from preparing those materials through unconventional approaches are very attractive from the green chemistry point of view. This critical review work is focused on sonication as one of these promising new synthetic procedures that allow control over size, morphology, nanostructure and tuning of catalytic properties. Ultrasound-based procedures offer a facile, versatile synthetic tool for the preparation of light-activated materials often inaccessible through conventional methods.

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“…However, many of them are based on wet chemistry processes, such as solgel, hydrothermal and solvothermal methods, which involve high costs, are time-consuming, have low throughput and are difficult to use in large-scale production [20,21]. Recently, functional porous metal oxide microspheres (MS) have been rapidly realized using aerosol spray pyrolysis [22][23][24][25]. The formed droplets have different sacrificial templates that can serve as individual microreactors, thereby exhibiting great advantages for preparing porous sphere materials with large surface areas and high purity.…”

Section: Introductionmentioning

confidence: 99%

Aerosol Spray Pyrolysis Synthesis of Porous Anatase TiO2 Microspheres with Tailored Photocatalytic Activity

Jiang

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Porous titanium dioxide (TiO 2) microspheres (MS) were prepared by a facile ultrasonic spray pyrolysis process with commercial colloidal silica as a sacrificial template. The morphology structure, Brunauer-Emmett-Teller surface areas and pore size distribution of TiO 2 microspheres were studied by changing the content and diameter of the silica template in detail. These porous micro-sized MS are composed of anatase TiO 2 nanocrystallites of 5-10 nm and have unique bimodal mesopores. The largest specific surface area of 112.3 m 2 /g has been achieved using 60 wt% 20 nm silica as a template. When used as photocatalysts, the best photocatalytic activity of the as-prepared porous MS is comparable to commercial P25 nanopowders. Moreover, the micro-size and tailored properties from the design that appear during the ultrasonic spray pyrolysis process give these porous MS a promising application in photocatalytic reaction.

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High Surface Area Iron Oxide Microspheres via Ultrasonic Spray Pyrolysis of Ferritin Core Analogues

Cited by 22 publications

References 63 publications

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Synthesis of Photoactive Materials by Sonication: Application in Photocatalysis and Solar Cells

Aerosol Spray Pyrolysis Synthesis of Porous Anatase TiO2 Microspheres with Tailored Photocatalytic Activity

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