Environmentally friendly growth and characterization of photocatalytic K2Nb8O21 crystals

Katsuya Teshima; Yuki Niina; Kunio Yubuta; Tatsuo Nakazawa; Takaomi Suzuki; Toetsu Shishido; Nobuo Ishizawa; Shuji Oishi

doi:10.1143/JJAP.47.629

Environmentally friendly growth and characterization of photocatalytic K₂Nb₈O₂₁ crystals

Katsuya Teshima, Yuki Niina, Kunio Yubuta, Tatsuo Nakazawa, Takaomi Suzuki, Toetsu Shishido, Nobuo Ishizawa, Shuji Oishi

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Idiomorphic and prismatic K₂Nb₈O₂₁ crystals were successfully grown by the isothermal evaporation of KCl flux. On the basis of their aspect ratio, the crystals were divided into two morphological types, that is, whisker (needle) and prism. Growth was induced by heating mixtures of KCl and Nb₂O₅ at 1100°C for 60 h followed by quenching in a furnace with the electric power turned off. The obtained K₂Nb₈O₂₁ crystals were colorless and transparent. Whiskers having an average size of approximately 160 × 11.1 μm were grown from high-temperature solutions containing Nb at 1-30mol %. The grown crystals had roundish or prismatic one-dimensional forms, and their surfaces were very smooth. Their generation and sizes were obviously dependent on the Nb concentration of the starting mixtures. The K₂Nb ₈O₂₁ crystals exhibited high activity for dye adsorption and degradation. The degradation occurred via a photocatalytic process under ultraviolet light irradiation.

Original language	English
Pages (from-to)	629-632
Number of pages	4
Journal	Japanese journal of applied physics
Volume	47
Issue number	1 PART 2
DOIs	https://doi.org/10.1143/JJAP.47.629
Publication status	Published - Jan 22 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy(all)

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title = "Environmentally friendly growth and characterization of photocatalytic K2Nb8O21 crystals",

abstract = "Idiomorphic and prismatic K2Nb8O21 crystals were successfully grown by the isothermal evaporation of KCl flux. On the basis of their aspect ratio, the crystals were divided into two morphological types, that is, whisker (needle) and prism. Growth was induced by heating mixtures of KCl and Nb2O5 at 1100°C for 60 h followed by quenching in a furnace with the electric power turned off. The obtained K2Nb8O21 crystals were colorless and transparent. Whiskers having an average size of approximately 160 × 11.1 μm were grown from high-temperature solutions containing Nb at 1-30mol %. The grown crystals had roundish or prismatic one-dimensional forms, and their surfaces were very smooth. Their generation and sizes were obviously dependent on the Nb concentration of the starting mixtures. The K2Nb 8O21 crystals exhibited high activity for dye adsorption and degradation. The degradation occurred via a photocatalytic process under ultraviolet light irradiation.",

author = "Katsuya Teshima and Yuki Niina and Kunio Yubuta and Tatsuo Nakazawa and Takaomi Suzuki and Toetsu Shishido and Nobuo Ishizawa and Shuji Oishi",

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AU - Teshima, Katsuya

AU - Niina, Yuki

AU - Yubuta, Kunio

AU - Nakazawa, Tatsuo

AU - Suzuki, Takaomi

AU - Shishido, Toetsu

AU - Ishizawa, Nobuo

AU - Oishi, Shuji

PY - 2008/1/22

Y1 - 2008/1/22

N2 - Idiomorphic and prismatic K2Nb8O21 crystals were successfully grown by the isothermal evaporation of KCl flux. On the basis of their aspect ratio, the crystals were divided into two morphological types, that is, whisker (needle) and prism. Growth was induced by heating mixtures of KCl and Nb2O5 at 1100°C for 60 h followed by quenching in a furnace with the electric power turned off. The obtained K2Nb8O21 crystals were colorless and transparent. Whiskers having an average size of approximately 160 × 11.1 μm were grown from high-temperature solutions containing Nb at 1-30mol %. The grown crystals had roundish or prismatic one-dimensional forms, and their surfaces were very smooth. Their generation and sizes were obviously dependent on the Nb concentration of the starting mixtures. The K2Nb 8O21 crystals exhibited high activity for dye adsorption and degradation. The degradation occurred via a photocatalytic process under ultraviolet light irradiation.

AB - Idiomorphic and prismatic K2Nb8O21 crystals were successfully grown by the isothermal evaporation of KCl flux. On the basis of their aspect ratio, the crystals were divided into two morphological types, that is, whisker (needle) and prism. Growth was induced by heating mixtures of KCl and Nb2O5 at 1100°C for 60 h followed by quenching in a furnace with the electric power turned off. The obtained K2Nb8O21 crystals were colorless and transparent. Whiskers having an average size of approximately 160 × 11.1 μm were grown from high-temperature solutions containing Nb at 1-30mol %. The grown crystals had roundish or prismatic one-dimensional forms, and their surfaces were very smooth. Their generation and sizes were obviously dependent on the Nb concentration of the starting mixtures. The K2Nb 8O21 crystals exhibited high activity for dye adsorption and degradation. The degradation occurred via a photocatalytic process under ultraviolet light irradiation.

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JO - Japanese journal of applied physics

JF - Japanese journal of applied physics

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ER -

Environmentally friendly growth and characterization of photocatalytic K₂Nb₈O₂₁ crystals

Abstract

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