Jia Yuefa, Li Shiping, Ma Haoxuan, Gao Jianzhi, Zhu Gangqiang, Zhang Fuchun, Park Jun Young, Cha Sangwon, Bae Jong-Seong, Liu Chunli
School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, PR China; Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin, 17035, Republic of Korea.
School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, PR China.
J Hazard Mater. 2020 Jan 15;382:121121. doi: 10.1016/j.jhazmat.2019.121121. Epub 2019 Aug 29.
To fully utilize the solar light, photocatalyst with broad spectrum response from UV to near-infrared (NIR) is desirable. In this work, ternary mixed valent BiO-BiO-BiO with rich oxygen vacancy has been synthesized through one-pot hydrothermal treatment of NaBiO. The results showed that through adjusting the hydrothermal conditions, oxygen vacancy-rich BiO-BiO-BiO nanocomposites with much higher efficiency than single or mixed bismuth oxides (BiO, BiO, BiO and BiO-BiO,) can be synthesized for photocatalytic degradation of bisphenol A (BPA) under UV, visible, and NIR light irradiation. In addition, the liquid chromatography-mass spectrometer (LC-MS) characterization demonstrated that BPA was oxidized to 4-isopropenyphenol first and the rings were opened sequentially under NIR light irradiation. Further detection of reactive species indicated that holes, O, and OH were the main oxidizing species in the degradation system. The experimental observations and density functional theory (DFT) calculations suggested that both type-II and the Z-scheme charge transfer with oxygen vacancies as electrons and holes mediators were formed at the interfaces of BiO, BiO, and BiO, resulting in a very efficient separation of photogenerated charge carriers in the composite. This work adds to the growing potential of mixed valent bismuth oxides based photocatalysts and is expected to accelerate the pace of the development of new-generation photocatalysts with high efficiency utilizing full-spectrum solar light.
为了充分利用太阳光，具有从紫外光到近红外（NIR）的广谱响应的光催化剂是理想的。在这项工作中，通过对NaBiO进行一锅水热法处理，合成了具有丰富氧空位的三元混合价BiO-BiO-BiO。结果表明，通过调节水热条件，可以合成比单铋氧化物或混合铋氧化物（BiO、BiO、BiO和BiO-BiO）效率高得多的富含氧空位的BiO-BiO-BiO纳米复合材料，用于在紫外光、可见光和近红外光照射下光催化降解双酚A（BPA）。此外，液相色谱-质谱联用仪（LC-MS）表征表明，在近红外光照射下，BPA首先被氧化为4-异丙烯基苯酚，然后环依次打开。对活性物种的进一步检测表明，空穴、O和OH是降解体系中的主要氧化物种。实验观察和密度泛函理论（DFT）计算表明，在BiO、BiO和BiO的界面处形成了以氧空位为电子和空穴介质的II型和Z型电荷转移，导致复合材料中光生载流子的非常有效的分离。这项工作增加了基于混合价铋氧化物的光催化剂的潜力，并有望加快开发高效利用全光谱太阳光的新一代光催化剂的步伐。
