Preparation and Characterization of CaO-Bi2O3 Complex Oxide

CaO-Bi2O3复合氧化物的制备及表征

• 批准号: 22550184
• 负责人: MATSUSHIMA Shigenori
• 金额: $ 3万
• 依托单位: Kitakyushu National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22550184/
• 关键词: 光触媒; 無機微粒子の合成; 機器分析; 電子構造計算; 複合酸化物; 可視光応答; CaO-Bi2O3系複合酸化物; CaO-Bi_2O_3系複合酸化物; CaO-Bi_2O_3複合酸化物

The single phase of Ca4Bi6O13 crystal was obtained at lower calcination temperature in a citric acid complex method in comparison with a solid-state reaction method. It was confirmed that the photocatalytic activity of Ca4Bi6O13 for the degradation of methylene blue (MB) was higher in a citric acid complex method than in a solid-state reaction under visible-light irradiation (λ ? 420 nm). When Sr was added to Ca4Bi6O13, the optical band gap of Ca4Bi6O13 decreases slightly and the photocatalytic activity was improved. Further, we performed first-principles band calculation of Ca4Bi6O13 to determine the type of the optical transition, the characters of valence and conduction bands, and the band-gap energy. Ca4Bi6O13 is a direct-gap oxide and the energy states near the valence band maximum (VBM) and conduction band minimum (CBM) show wide dispersion, indicating a higher mobility of holes and electrons generated by band gap excitation. In addition, Ca4Bi6O13 has a distorted local structure consisting of [BiO6] polyhedron and a consequent dipole moment. Thus, a high photocatalytic ability of Ca4Bi6O13 is attributable to both the wide band dispersion near the valence band maximum and the conduction band minimum and its distorted local crystal structure.

与固相反应法相比，柠檬酸络合法制备的Ca4Bi6O13晶体在较低的焙烧温度下即可得到单相。证实了Ca4Bi6O13在可见光(λ？420 nm)照射下，柠檬酸络合法光催化降解亚甲基蓝(MB)的活性高于固相反应。在Ca4Bi6O13中加入锶后，Ca4Bi6O13的光学带隙略有减小，光催化活性有所提高。此外，我们对Ca4Bi6O13进行了第一性原理能带计算，确定了光学跃迁的类型，价带和导带的特征，以及带隙能量。Ca4Bi6O13是一种直接带隙氧化物，价带最大值(VBM)和导带最小值(CBM)附近的能态表现出较宽的弥散，表明带隙激发产生的空穴和电子的迁移率较高。此外，Ca4Bi6O13具有由[BiO6]多面体和随之而来的偶极矩组成的扭曲的局部结构。因此，Ca4Bi6O13具有较高的光催化能力是由于其价带最大值和导带最小值附近的宽带色散以及其扭曲的局域晶体结构。

项目成果

異種元素をドープしたCa4Bi6O13 の調製とキャラクタリゼーション

不同元素掺杂Ca4Bi6O13的制备及表征

• 发表时间: 2010
• 作者: 小畑賢次;上原拓也;松嶋茂憲
• 通讯作者: 松嶋茂憲

不純物をドープしたCa_4Bi_6O_13の調製とキャラクタリゼーション

杂质掺杂Ca_4Bi_6O_13的制备及表征

• 发表时间: 2010
• 作者: 上原拓也;小畑賢次;松嶋茂憲
• 通讯作者: 松嶋茂憲

First-principles study on electronic structure and optical properties of Ca4Bi6O13 crystal

• DOI: 10.1016/j.jpcs.2012.07.012
• 发表时间: 2013
• 期刊: Journal of Physics and Chemistry of Solids
• 影响因子: 4
• 作者: Hiroyuki Nakamura;Y. Obukuro;K. Obata;S. Matsushima;M. Arai;Kenkichiro Kobayashi

クエン酸錯体法によるビスマス系アルカリ土類複合酸化物の調製とキャラクタリゼーション

柠檬酸络合法制备铋基碱土复合氧化物并表征

• 发表时间: 2011
• 作者: 及川勝成;須藤祐司;石川博康;貝沼亮介;石田清仁;松嶋茂憲
• 通讯作者: 松嶋茂憲

Preparation and Characterization of Ca4Bi6O13 Complex Oxide

• DOI: 10.1246/cl.2011.288
• 发表时间: 2011-02
• 期刊: Chemistry Letters
• 影响因子: 1.6
• 作者: ObataKenji;MatsumotoKensuke;UeharaTakuya;DoiAkane;ObukuroYuki;MatsushimaShigenori