Shen Zichen, Liu Huanzhen, Jia Xuemei, Han Qiaofeng, Bi Huiping
Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China.
Dalton Trans. 2021 Jun 1;50(21):7464-7473. doi: 10.1039/d1dt00745a.
Bismuth-rich oxyhalides are promising photocatalysts due to their special layered structure and adjustable band gap energy. In this work, a series of bismuth oxyiodides were fabricated by grinding-assisted calcination in the presence of thiourea, where grinding-induced mechanical force could accelerate the decomposition reaction and thiourea could prohibit the crystal particles from growing due to coordination action. The combined effect of grinding and thiourea could decrease the temperature of phase transformation of bismuth oxyiodides. Among these, heterojunction Bi4O5I2/Bi5O7I containing uniform flower-like microspheres assembled by ultra-thin nanosheets exhibited the highest photocatalytic activity and favorable stability for the degradation of the antibiotic tetracycline under visible light irradiation. This work could provide a good reference for the design of bismuth-rich oxyhalide heterojunction for photocatalytic applications.
富铋卤氧化物因其特殊的层状结构和可调的带隙能量而成为有前途的光催化剂。在这项工作中，通过在硫脲存在下的研磨辅助煅烧制备了一系列碘氧化铋，其中研磨诱导的机械力可以加速分解反应，而硫脲由于配位作用可以抑制晶体颗粒的生长。研磨和硫脲的联合作用可以降低碘氧化铋的相变温度。其中，由超薄纳米片组装而成的含有均匀花状微球的异质结Bi4O5I2/Bi5O7I在可见光照射下对抗生素四环素的降解表现出最高的光催化活性和良好的稳定性。这项工作可为光催化应用中富铋卤氧化物异质结的设计提供很好的参考。
