Photocatalytic reaction over iron hydroxides: A novel visible-light-responsive photocatalyst

Murakami, Naoya; Matsuo, Takuma; Tsubota, Toshiki; Ohno, Teruhisa

doi:10.1016/j.catcom.2010.10.012

Cited by 19 publications

(17 citation statements)

References 13 publications

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“…This ion is a possible source of NO and hydroxyl radicals [31]. In the case of iron oxide [37] and iron hydroxide [38], we can expect further photocatalytic activity at the air/fluid interface.…”

Section: Rheological Characteristics Of the Catalyst Support Precursomentioning

confidence: 99%

“…The results from the thermogravimetric analyzer are shown in Figure 2 which indicates the rapid water loss from silica dispersion while the weight loss from cobalt nitrate solution is the slowest, although at about 220˝C, the rate of weight loss is fastest which corresponds to the decomposition of Co(NO 3 In the case of iron oxide [37] and iron hydroxide [38], we can expect further photocatalytic activity at the air/fluid interface. These observations formed the bases of modelling of the current technique for the supported catalyst production through self-assembly of the catalyst precursor and silica support.…”

Section: Tga Analysismentioning

confidence: 99%

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Co-Assembled Supported Catalysts: Synthesis of Nano-Structured Supported Catalysts with Hierarchic Pores through Combined Flow and Radiation Induced Co-Assembled Nano-Reactors

Akay

2016

Catalysts

106

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Abstract:A novel generic method of silica supported catalyst system generation from a fluid state is presented. The technique is based on the combined flow and radiation (such as microwave, thermal or UV) induced co-assembly of the support and catalyst precursors forming nano-reactors, followed by catalyst precursor decomposition. The transformation from the precursor to supported catalyst oxide state can be controlled from a few seconds to several minutes. The resulting nano-structured micro-porous silica supported catalyst system has a surface area approaching 300 m 2 /g and X-ray Diffraction (XRD)-based catalyst size controlled in the range of 1-10 nm in which the catalyst structure appears as lamellar sheets sandwiched between the catalyst support. These catalyst characteristics are dependent primarily on the processing history as well as the catalyst (Fe, Co and Ni studied) when the catalyst/support molar ratio is typically 0.1-2. In addition, Ca, Mn and Cu were used as co-catalysts with Fe and Co in the evaluation of the mechanism of catalyst generation. Based on extensive XRD, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) studies, the micro-and nano-structure of the catalyst system were evaluated. It was found that the catalyst and silica support form extensive 0.6-2 nm thick lamellar sheets of 10-100 nm planar dimensions. In these lamellae, the alternate silica support and catalyst layer appear in the form of a bar-code structure. When these lamellae structures pack, they form the walls of a micro-porous catalyst system which typically has a density of 0.2 g/cm 3 . A tentative mechanism of catalyst nano-structure formation is provided based on the rheology and fluid mechanics of the catalyst/support precursor fluid as well as co-assembly nano-reactor formation during processing. In order to achieve these structures and characteristics, catalyst support must be in the form of silane coated silica nano-particles dispersed in water which also contains the catalyst precursor nitrate salt. This support-catalyst precursor fluid must have a sufficiently low viscosity but high elastic modulus (high extensional viscosity) to form films and bubbles when exposed to processing energy sources such as microwave, thermal, ultra-sound or UV-radiation or their combination. The micro-to-nano structures of the catalyst system are essentially formed at an early stage of energy input. It is shown that the primary particles of silica are transformed to a proto-silica particle state and form lamellar structures with the catalyst precursor. While the nano-structure is forming, water is evaporated leaving a highly porous solid support-catalyst precursor which then undergoes decomposition to form a silica-catalyst oxide system. The final catalyst system is obtained after catalyst oxide reduction. Although the XRD-based catalyst size changes slightly during the subsequent heat treatments, the nano-structure of the catalyst system remains substantially unaltered as evaluated through TEM images. Howev...

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Section: Rheological Characteristics Of the Catalyst Support Precursomentioning

confidence: 99%

Section: Tga Analysismentioning

confidence: 99%

Co-Assembled Supported Catalysts: Synthesis of Nano-Structured Supported Catalysts with Hierarchic Pores through Combined Flow and Radiation Induced Co-Assembled Nano-Reactors

Akay

2016

Catalysts

106

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“…Actually, a pristine titania photocatalyst is less active for purification of indoor air, since the intensity of UV light emitted from a fluorescent light tube is very low. In this sense, development of visible-light-responsive photocatalysts with high levels of activity is still one of the research fields of photocatalyst materials [1][2][3][4][5][6][7].…”

mentioning

confidence: 99%

Enhanced photocatalytic activity of bismuth-tungsten mixed oxides for oxidative decomposition of acetaldehyde under visible light irradiation

Amano

Nogami

Ohtani

2012

Catalysis Communications

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Russelite bismuth tungstate (Bi 2 WO 6 ) flake-ball particles prepared by a hydrothermal reaction method have been reported to be visible-light-responsive photocatalysts for mineralization of organic compounds. Here, we report new bismuth-tungsten mixed oxide particles with a tungsten-to-bismuth ratio (W/Bi ratio) in feed of 1.0, which is two-times higher than the stoichiometric ratio of Bi 2 WO 6 (W/Bi = 0.50). Compared to the conventional Bi 2 WO 6 flake-ball particles, the tungsten-rich particles exhibited a narrow band gap (2.70 eV), large specific surface area due to the rectangular platelet nanostructure, and high level of photocatalytic activity for oxidative decomposition of acetaldehyde.

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“…Murakami et al [64] prepared FeOOH particles by a hydrothermal method and estimated their photocatalytic activity toward degrading acetaldehyde under visible light irradiation.…”

Section: Feoohmentioning

confidence: 99%

Promotion of multi-electron transfer for enhanced photocatalysis: A review focused on oxygen reduction reaction

Wang

Zhang

Liu

2015

Applied Surface Science

120

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Photocatalytic reaction over iron hydroxides: A novel visible-light-responsive photocatalyst

Cited by 19 publications

References 13 publications

Co-Assembled Supported Catalysts: Synthesis of Nano-Structured Supported Catalysts with Hierarchic Pores through Combined Flow and Radiation Induced Co-Assembled Nano-Reactors

Co-Assembled Supported Catalysts: Synthesis of Nano-Structured Supported Catalysts with Hierarchic Pores through Combined Flow and Radiation Induced Co-Assembled Nano-Reactors

Enhanced photocatalytic activity of bismuth-tungsten mixed oxides for oxidative decomposition of acetaldehyde under visible light irradiation

Promotion of multi-electron transfer for enhanced photocatalysis: A review focused on oxygen reduction reaction

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