Juay Jermyn, Yang Jia-Cheng E, Bai Hongwei, Sun Darren Delai
School of Civil and Environmental Engineering, Nanyang Technological University Singapore 639798 Singapore
CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences Xiamen 361021 China.
RSC Adv. 2022 Sep 7;12(39):25449-25456. doi: 10.1039/d2ra02181a. eCollection 2022 Sep 5.
The elimination of dyes from textile wastewater with a lower carbon footprint is highly contingent on the design of green catalysts. Here, we innovatively developed ultralong one-dimensional BiTiO/TiO heterojunction nanofibers electrospinning so as to photocatalytically degrade dyes efficiently and sustainably through the utilisation of renewable solar irradiation. The heterostructured BiTiO/TiO nanofibers exhibited desirable activity in the visible light region through the slight shift of the absorption edge to a longer wavelength. The BiTiO/TiO nanofibers calcined at 550 °C had a lower optical band gap (3.08 eV) than that of the pure TiO (3.32 eV), as evidenced by their higher photocatalytic degradation kinetics of a model dye (Acid Orange 7) (2.5 times greater than those of pure TiO). The enhanced visible light photocatalytic performance arose from the formation of both the BiTiO/TiO heterojunction and the effective separation of photogenerated holes and electrons. The employment of ultralong BiTiO/TiO heterojunction nanofibers for dye removal/decolourisation under visible light is an efficient, cost effective and sustainable solution, which will provide significant insights for practical textile wastewater treatment in view of practical engineering applications.
以较低的碳足迹从纺织废水中去除染料很大程度上取决于绿色催化剂的设计。在此，我们创新性地通过静电纺丝法制备了超长一维BiTiO/TiO异质结纳米纤维，以便利用可再生的太阳光催化高效且可持续地降解染料。通过吸收边向更长波长的轻微移动，异质结构的BiTiO/TiO纳米纤维在可见光区域表现出理想的活性。在550℃煅烧的BiTiO/TiO纳米纤维比纯TiO（3.32 eV）具有更低的光学带隙（3.08 eV），这由其对模型染料（酸性橙7）更高的光催化降解动力学所证明（比纯TiO高2.5倍）。可见光光催化性能的增强源于BiTiO/TiO异质结的形成以及光生空穴和电子的有效分离。使用超长BiTiO/TiO异质结纳米纤维在可见光下进行染料去除/脱色是一种高效、经济且可持续的解决方案，鉴于实际工程应用，这将为实际纺织废水处理提供重要见解。
