Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
J Hazard Mater. 2013 Jun 15;254-255:185-192. doi: 10.1016/j.jhazmat.2013.03.046. Epub 2013 Mar 27.
Bi₂WO6 doped with different amounts of boron atoms (0.1, 0.5, 1.0, 5.0 and 10% B) were synthesized using hydrothermal method and their photocatalytic activities to degrade rhodamine B (RhB) under simulated solar light was investigated. The successful incorporation of B atoms in Bi₂WO₆ was proved by FT-IR, Raman spectra and XPS. Doping with B could affect the pore structure and volume. 0.5% B/Bi₂WO₆ displayed more mesopores with higher total pore volume than pure Bi₂W₆; while the pores of 10% B/Bi₂WO₆ mainly distributed in microporous range with much less total pore volume. As a result, 0.5% B/Bi₂WO₆ displayed stronger adsorption capacity to RhB, favoring the photodegradation. In addition, the doped B atoms could act as electron traps and facilitate the separation of photogenerated electron-hole pairs due to its electron deficient and oxytropic characteristics. 0.5% B/Bi₂WO₆ displayed the highest photocatalytic activity under simulated solar light with rate constant (kobs) 8.8 times of that using pure Bi₂WO₆. Its photoactivity was affected by solution pH and the optimum was achieved at pH 7. At this condition, around 100% of RhB (10(-5)mol/L) was degraded in 180 min. The photogenerated holes were the main active species responsible for the photodegradation of RhB by B/Bi₂WO₆.
采用水热法合成了不同硼原子掺杂量（0.1、0.5、1.0、5.0 和 10% B）的 Bi₂WO₆，并在模拟太阳光下考察了其对罗丹明 B（RhB）的光催化降解活性。FT-IR、拉曼光谱和 XPS 证明了 B 原子成功掺入到 Bi₂WO₆ 中。B 的掺杂会影响孔结构和体积。与纯 Bi₂WO₆ 相比，0.5%B/Bi₂WO₆ 具有更多的中孔和更高的总孔体积；而 10%B/Bi₂WO₆ 的孔主要分布在微孔范围内，总孔体积较小。因此，0.5%B/Bi₂WO₆ 对 RhB 具有更强的吸附能力，有利于光降解。此外，由于其缺电子和氧化特性，掺杂的 B 原子可以作为电子陷阱，促进光生电子-空穴对的分离。在模拟太阳光下，0.5%B/Bi₂WO₆ 的光催化活性最高，其速率常数（kobs）是纯 Bi₂WO₆ 的 8.8 倍。其光活性受溶液 pH 值的影响，在 pH 值为 7 时达到最佳。在该条件下，浓度为 10(-5)mol/L 的 RhB 在 180 min 内几乎完全降解。光生空穴是 B/Bi₂WO₆ 光降解 RhB 的主要活性物种。
